RRB General Science Chapterwise Solved Papers 2024 PDF

RRB General Science Chapterwise Solved Papers Computer Based Test CHIEF EDITOR A.K. Mahajan COMPLIED BY YCT Exam Expert Group COMPUTER GRAPHICS BY...

RRB General Science Chapterwise Solved Papers Computer Based Test CHIEF EDITOR A.K. Mahajan COMPLIED BY YCT Exam Expert Group COMPUTER GRAPHICS BY Balkrishna Tripathi & Vinay Sahu EDITORIAL OFFICE 12, Church Lane Prayagraj-211002 Mob. : 9415650134 Email : [email protected] website : www.yctbooks.com / www.yctfastbook.com © All rights reserved with Publisher PUBLISHER DECLARATION Edited and Published by A.K. Mahajan for YCT Publications Pvt. Ltd. and printed by R.A. Security Printers In order to Publish the book, full care has been taken by the Editor and the Publisher, still your suggestions and queries are welcomed. In the event of any dispute, the judicial area will be Prayagraj. Rs. : 795/-  11 CONTENT Section-1 : Physics Physics.............................................................................................................................. 11-254 ◘ Unit/ Measurement/Measuring Instrument.............................................................................................. 11 Unit.......................................................................................................................................................... 11 Measurement........................................................................................................................................... 17 Measuring Instrument.............................................................................................................................. 18 Physical Quantities.................................................................................................................................. 22 ◘ Mechanics.................................................................................................................................................... 23 Work........................................................................................................................................................ 23 Power....................................................................................................................................................... 30 Energy..................................................................................................................................................... 32 Mass......................................................................................................................................................... 45 Newton's Law of Motion......................................................................................................................... 47 Force........................................................................................................................................................ 52 Linear Momentum................................................................................................................................... 56 Principle of Conservation of Momentum................................................................................................ 59 Distance and Displacement...................................................................................................................... 61 Speed/Velocity........................................................................................................................................ 61 Projectile Motion..................................................................................................................................... 63 Acceleration............................................................................................................................................ 63 Equation of Linear Motion...................................................................................................................... 66 Friction.................................................................................................................................................... 69 Simple Harmonic Motion/ Rotational Motion......................................................................................... 70 ◘ Gravitation.................................................................................................................................................. 72 Newton's Law of Gravitation................................................................................................................... 72 Gravity and Motion under Gravity.......................................................................................................... 77 Satellite Motion /Escape Velocity........................................................................................................... 87 ◘ Properties of Matter.................................................................................................................................... 88 Elasticity.................................................................................................................................................. 88 Surface Tension/Capillarity..................................................................................................................... 88 Flow of Liquids....................................................................................................................................... 88 Buoyancy and Archimedes Principle....................................................................................................... 89 2  Pressure.................................................................................................................................................... 91 Density..................................................................................................................................................... 92 Kinetic Theory......................................................................................................................................... 93 ◘ Heat............................................................................................................................................................... 94 Temperature & Measurement of Temperature........................................................................................ 94 Thermal Conduction................................................................................................................................ 96 Thermal Expansion.................................................................................................................................. 97 Convection............................................................................................................................................... 97 Conductor/Non-conductor/Insulator........................................................................................................ 97 Kirchhoff's Law/Stefan's Law/Newton's Law of Cooling............................................................................ 98 Phase Transition and Latent Heat............................................................................................................ 99 Relative Humidity/Vaporization.............................................................................................................. 99 Thermodynamics................................................................................................................................... 100 ◘ Wave........................................................................................................................................................... 102 ◘ Sound.......................................................................................................................................................... 107 Nature of Sound Waves......................................................................................................................... 107 Frequency Range of Sound Waves........................................................................................................ 109 Speed of Sound...................................................................................................................................... 110 Characteristics of Sound........................................................................................................................ 115 Echo....................................................................................................................................................... 116 Sonar/Radar........................................................................................................................................... 117 ◘ Light........................................................................................................................................................... 118 Nature of Light...................................................................................................................................... 118 Scattering of Light................................................................................................................................. 120 Reflection of Light................................................................................................................................. 125 ♦ Rules of Reflection........................................................................................................................... 125 ♦ Reflection from Plane Mirror........................................................................................................... 139 ♦ Reflection from Spherical Mirror.................................................................................................... 139 Magnification........................................................................................................................................ 144 Refraction of Light................................................................................................................................ 147 Total Internal Reflection of Light.......................................................................................................... 155 Lens (Convex/Concave)........................................................................................................................ 155 Human Eye............................................................................................................................................ 162 Optical Instruments................................................................................................................................ 164 Dispersion of Light/Rainbow................................................................................................................ 164 ◘ Electricity................................................................................................................................................... 167 Electric Charge...................................................................................................................................... 167 Coulomb's Law...................................................................................................................................... 171 Electric Circuit....................................................................................................................................... 172 3  Electric Current..................................................................................................................................... 177 Electrical Conductivity/ Ohm's Law...................................................................................................... 183 Resistance.............................................................................................................................................. 189 Electric Power/Energy........................................................................................................................... 204 Electrical Instruments............................................................................................................................ 215 Transformer........................................................................................................................................... 221 Electric Bulb.......................................................................................................................................... 221 Electric Cell........................................................................................................................................... 223 ◘ Magnetism.................................................................................................................................................. 223 ◘ Electronics.................................................................................................................................................. 238 ◘ Modern Physics......................................................................................................................................... 240 ◘ Nuclear Physics.......................................................................................................................................... 241 ◘ Invention.................................................................................................................................................... 246 ◘ Miscellaneous............................................................................................................................................. 249 Section-2 : Chemistry Chemistry...................................................................................................................... 255-474 ◘ Chemistry : An Introduction................................................................................................................... 255 Matters................................................................................................................................................... 255 Classification of Matters........................................................................................................................ 256 Physical and Chemical Changes............................................................................................................ 257 Law of Conservation of Mass................................................................................................................ 259 Law of Constant Proportions................................................................................................................. 259 Dalton's Atomic Theory......................................................................................................................... 260 Molecule/Atomic Weight...................................................................................................................... 261 Mole Concept/Avogadro Number......................................................................................................... 264 Berzelius Hypothesis............................................................................................................................. 269 Metals, Non-metals & Metalloids.......................................................................................................... 269 Important methods of Separation of Mixture......................................................................................... 273 Change in State of Matter...................................................................................................................... 275 Solution.................................................................................................................................................. 275 Allotropy................................................................................................................................................ 278 Amu Unit............................................................................................................................................... 280 ◘ Atomic Structure....................................................................................................................................... 281 Atom and their Fundamental Components............................................................................................ 281 Atomic Models...................................................................................................................................... 283 Quantum Numbers................................................................................................................................. 283 Electronic Configuration....................................................................................................................... 285 Heisenberg's Uncertainty Principle........................................................................................................ 289 4 ◘ Atomic Nucleus.......................................................................................................................................... 289 Atomic Number and Mass Number....................................................................................................... 289 Isotopes.................................................................................................................................................. 292 Isobars................................................................................................................................................... 294 Isoelectronics......................................................................................................................................... 294 ◘ Gaseous Law.............................................................................................................................................. 294 ◘ Radioactivity and Nuclear Energy........................................................................................................... 296 ◘ Valency/Chemical Bonding...................................................................................................................... 298 ◘ Oxidation and Reduction.......................................................................................................................... 304 ◘ Electrolysis & Electro Chemical Series................................................................................................... 308 ◘ Acid, Base and Salt.................................................................................................................................... 312 Acid....................................................................................................................................................... 312 Base....................................................................................................................................................... 315 Salt......................................................................................................................................................... 317 pH Value................................................................................................................................................ 318 Acid-Base Indicator............................................................................................................................... 321 Amphoteric Oxide................................................................................................................................. 323 ◘ Periodic Classification of Elements.......................................................................................................... 324 Newland's Law of Octaves.................................................................................................................... 324 Dobereiner's Law of Triads................................................................................................................... 329 Mendeleev's Periodic Table................................................................................................................... 332 Moseley's Modern Periodic Table......................................................................................................... 337 Periodic Properties of Elements............................................................................................................. 355 ◘ Non-metals & Non-metallic Compounds and their Applications.......................................................... 363 Hydrogen............................................................................................................................................... 363 Oxygen.................................................................................................................................................. 364 Nitrogen................................................................................................................................................. 365 Phosphorous.......................................................................................................................................... 366 Halogen.................................................................................................................................................. 367 Inert Gases............................................................................................................................................. 370 Sulphur.................................................................................................................................................. 373 Carbon................................................................................................................................................... 374 ◘ Metals/ Metallic Compounds and their Applications............................................................................. 378 Sodium................................................................................................................................................... 378 Calcium.................................................................................................................................................. 385 Aluminium............................................................................................................................................. 393 Silver..................................................................................................................................................... 394 Gold....................................................................................................................................................... 396 Potassium............................................................................................................................................... 396 5  Iron........................................................................................................................................................ 397 Magnesium............................................................................................................................................ 399 Lead....................................................................................................................................................... 400 Mercury................................................................................................................................................. 400 Copper/ Zinc/Tin................................................................................................................................... 401 Other Metals.......................................................................................................................................... 403 ◘ Fuel............................................................................................................................................................. 404 ◘ Alloy............................................................................................................................................................ 408 ◘ Ores and Metallurgy................................................................................................................................. 410 ◘ Polymers..................................................................................................................................................... 412 ◘ Soap/ Detergents........................................................................................................................................ 414 ◘ Glass........................................................................................................................................................... 414 ◘ Explosive Material..................................................................................................................................... 414 ◘ Organic Chemistry.................................................................................................................................... 415 Nomenclature of Organic Compounds................................................................................................. 415 Hydrocarbons........................................................................................................................................ 420 Alcohol.................................................................................................................................................. 427 Carbonic Acid........................................................................................................................................ 430 Formaldehyde/Esters............................................................................................................................. 432 Other Organic Compounds.................................................................................................................... 433 ◘ Chemical Reactions................................................................................................................................... 434 ◘ Miscellaneous............................................................................................................................................. 451 Section-3 : Biology Biology........................................................................................................................... 475-662 ◘ Major Branches of Biology....................................................................................................................... 475 ◘ Cell (Theories/Structures/Functions)....................................................................................................... 478 Animal Cell........................................................................................................................................... 478 Plant Cell............................................................................................................................................... 483 ◘ Tissues........................................................................................................................................................ 485 Animal Tissues...................................................................................................................................... 485 Plant Tissues.......................................................................................................................................... 489 ◘ Bio Molecule (Lipids/ Proteins / Nucleic Acids)...................................................................................... 496 ◘ Genetics...................................................................................................................................................... 498 ◘ Organic-Evolution..................................................................................................................................... 510 ◘ Taxonomy................................................................................................................................................... 515 ◘ Animal Kingdom....................................................................................................................................... 518 Protista/Protozoa.................................................................................................................................... 518 Porifera.................................................................................................................................................. 519 Coelenterata........................................................................................................................................... 520 6  Platyhelminthes..................................................................................................................................... 521 Aschelminthes....................................................................................................................................... 521 Annelida................................................................................................................................................ 521 Arthropoda............................................................................................................................................. 522 Mollusca................................................................................................................................................ 523 Echinodermata....................................................................................................................................... 524 Chordata................................................................................................................................................ 525 ♦ Amphibia....................................................................................................................................... 526 ♦ Reptiles......................................................................................................................................... 527 ♦ Aves.............................................................................................................................................. 527 ♦ Mammalia..................................................................................................................................... 529 ♦ Pisces............................................................................................................................................ 531 ◘ Human Body.............................................................................................................................................. 532 Digestive System................................................................................................................................... 532 Blood Circulatory System...................................................................................................................... 542 Respiratory System................................................................................................................................ 554 Excretory System................................................................................................................................... 559 Nervous System..................................................................................................................................... 564 Skeleton System.................................................................................................................................... 571 Endocrine System.................................................................................................................................. 577 Reproductive System............................................................................................................................. 582 ◘ Proteins, Vitamins and Minerals.............................................................................................................. 593 ◘ Human Disease, Symptoms and Treatment............................................................................................ 598 ◘ Plant Kingdom........................................................................................................................................... 613 Bacteria.................................................................................................................................................. 613 Fungi...................................................................................................................................................... 614 Algae..................................................................................................................................................... 616 Bryophyta.............................................................................................................................................. 618 Pteridophyta........................................................................................................................................... 619 Gymnosperm......................................................................................................................................... 620 Angiosperm........................................................................................................................................... 621 ◘ Plant Morphology...................................................................................................................................... 623 Root....................................................................................................................................................... 623 Stem....................................................................................................................................................... 625 Leaf........................................................................................................................................................ 625 Flower.................................................................................................................................................... 626 Fruit....................................................................................................................................................... 628 7  ◘ Plant Physiology........................................................................................................................................ 629 Transpiration.......................................................................................................................................... 629 Photosynthesis....................................................................................................................................... 630 Respiration............................................................................................................................................. 633 Transport in Plants................................................................................................................................. 635 Plant Hormones..................................................................................................................................... 637 Plant Movements................................................................................................................................... 639 ◘ Reproduction in Plants............................................................................................................................. 640 ◘ Economical Importance of Animals and Plants...................................................................................... 644 ◘ Genetic Engineering and Biotechnology.................................................................................................. 647 ◘ Major Biologist/Inventions....................................................................................................................... 649 ◘ Miscellaneous............................................................................................................................................. 651 Section-4 : Computer Computer....................................................................................................................... 663-726 ◘ Computer : Introduction.............................................................................................................................. 663 ◘ Development of Computer.......................................................................................................................... 667 ◘ Input/Output Devices.................................................................................................................................. 673 ◘ Memory....................................................................................................................................................... 678 ◘ Design Tools and Programming Languages................................................................................................ 685 ◘ Data Representation and Numerical System............................................................................................... 688 Numerical System.................................................................................................................................. 688 Boolean Algebra.................................................................................................................................... 689 Logical Gate.......................................................................................................................................... 690 ◘ Software...................................................................................................................................................... 691 ◘ Data Transmission....................................................................................................................................... 699 ◘ Internet........................................................................................................................................................ 704 ◘ M.S. Office.................................................................................................................................................. 711 ◘ M.S. Windows............................................................................................................................................. 717 ◘ Abbreviation................................................................................................................................................ 718 ◘ Miscellaneous.............................................................................................................................................. 722 Section-5 : Environment And Ecology Environment and Ecology............................................................................................ 727-784 ◘ Environment and Ecosystem....................................................................................................................... 727 ◘ Biodiversity................................................................................................................................................. 731 ◘ Environmental Conservation : Global Efforts............................................................................................. 737 ◘ National Parks and Wildlife Sanctuaries..................................................................................................... 743 ◘ Pollution...................................................................................................................................................... 751 ◘ Ozone Layer................................................................................................................................................ 759 ◘ Green House Effect/Climate Change.......................................................................................................... 767 ◘ Wildlife Conservation and Management..................................................................................................... 774 ◘ Natural Energy............................................................................................................................................ 778 ◘ Miscellaneous.............................................................................................................................................. 781 8  Analysis Chart of Question Papers of Various Previous Exams of RRB S.N. Exam Exam Total General Science year Question Papers 1. RRB NTPC-2019 2022 15 20×15= 300 Stage-II 2. RRC Group-D 2019 2022 99 25×99= 2475 3. RRB NTPC-2019 2020-2021 133 30×133= 3990 Stage-I 4. RRB JE-2018 2019 9 15×9 = 135 Stage-II 5. RPF Constable 2018 2019 17 30×17 = 510 6. RPF SI 2018 2019 23 30×23 = 690 7. RRB JE-2018 2019 38 15×38 = 570 Stage-I 8. RRB ALP/Tech.-2018 2019 18 10×18 = 180 Stage-II 9. RRB ALP/Tech.-2018 2018 30 10 × 30 = 300 Stage-I 10. RRB Group D 2018 2018 135 20 × 135 = 2700 11. RRB NTPC-2015 2017 9 15 × 9 = 135 Stage-II 12. RRB NTPC-2015 2016 63 30 × 63 = 1890 Stage-I 13. RRB JE 2015 2015 26 15 × 26 = 390 14. RRB JE 2014 2014 10 15 × 10 = 150 Total 625 14415 Note– In this book, out of total 625 papers of JE, ALP, NTPC, RPF Constable, RPF SI, Group D and Paramedical exams conducted by RRB, out of total 14415 questions asked from General Mathematics. Same behavior have been removed and chapterwise compilation of questions of different types has been presented. In this book, every effort has been made by the Examination Special Committee to accommodate maximum variety of questions, so that the examinees can be made aware of the variety of questions asked by RRB. 9 Trend Analysis of Previous Year RRB JE, ALP, NTPC & Group-D Papers Through Pie Chart and Bar Graph Environment & Ecology Physics, 2299 , 688 Computer , 747 Biology , 1991 Chemistry , 2189 2299 2189 1991 747 688 Physics Chemistry Biology Computer Environment and Ecology 10  Part-1 PHYSICS 6. The S.I. unit of resistivity is: 1. Unit/Measurement/Measuring (a) ohm/m (b) ohm (c) mho (d) ohm m Instrument RRB Group-D 25-08-2022 (Shift-II) Ans. (d) : The S.I. unit of resistivity is ohm meter. Electrical resistivity is that property of material, that (i) Unit measures how strongly it resists electric current. 1. The commercial unit of electrical energy is 7. Newton is the unit to measure ______.......... (a) Power (b) Force (a) Watt (b) Calorie (c) Pressure (d) Resistance (c) Kilowatt hour (d) Joule RRB NTPC 08.02.2021 (Shift-II) Stage Ist RRB Group-D– 30/09/2022 (Shift-I) Ans : (b) : Ans.(c) : The commercial unit of electrical energy is Quantity SI - Unit kilowatt hour. Power Watt One kilowatt hour = 1000W × 1 hour Force Newton = 1000 × 3600 Pressure Pascal = 3.6 × 106Joule Resistance Ohm 2. The S.I. unit of resistance is equivalent to: 8. The SI unit of sound wave frequency was (a) joule/coulomb (b) volt/ampere named in honour of which physicist? (c) ampere/volt (d) coulomb/joule (a) Werner Karl Heisenberg RRB Group-D 25-08-2022 (Shift-III) (b) Heinrich Rudolf Hertz Ans. (b) : According to ohms law (c) Albert Einstein V = IR (d) J C Maxwell R = V/I RRB NTPC 19.01.2021 (Shift-II) Stage Ist SI unit of resistance = volt/ampere. Ans : (b) The term 'Hertz' was proposed in the early 3. The physical quantity having a unit of 1920s by German scientists to honour the 19th century volt/ampere is –––––––. German physicist Heinrich Hertz. Hertz is a part of (a) work (b) Current International System of Units or SI System which is (c) charge (d) resistance based on the Metric System. RRB Group-D 28-09-2022 (Shift-III) 9. The work done by a force acting on an object is Ans. (d) : The physical quantity having a unit of equal to the amount of force multiplied by the volt/ampere is resistance. distance travelled in the direction of the force. Whereas, Which of the following is NOT a unit of work ? Work = force x displacement (a) Kgm/sec2 (b) Kgm2/sec2 (c) Newton meter (d) Joule Voltage (V) RRB NTPC 13.03.2021 (Shift-I) Stage Ist Current = Resistance (R) Ans : (a) Work can be defined as 'workdone by a force Current on an object is equal to the magnitude of the force Charge (Q) = multiplied by the distance travelled by the object the Time object in the direction of force. 4. The unit of resistance is ………. (a) Ampere (b) Coulomb ⇒ W = FScos θ (c) Ohm (d) Volt The SI unit of work is Newton-metre (N-m) or Joule (J) RRB Group-D 29-09-2022 (Shift-III) or Kg-m2/sec2 and its CGS unit is Erg. Newton (Kg- Ans. (c) : Resistance is a measure of the opposition to m/sec2) is the unit of Force. current flow in an electrical circuit. 10. The unit of Force is: The unit of resistance is ohm. (a) gms–1 (b) Kgms–2 –2 5. The S.I. unit of induced potential difference is: (c) gms (d) Kgms–1 (a) mV (b) A RRB NTPC 13.03.2021 (Shift-I) Stage Ist (c) V (d) mA Ans : (b) The SI unit of Force is kg.ms-2. The quantity RRB Group-D 22-08-2022 (Shift-III) of force is expressed by the vector product of mass (m) Ans. (c) : Induced emf is potential difference only and acceleration (a). hence its unit is volt only. ⇒ F = ma RRB Science Planner Physics 11 YCT 11. Which of the following is not a unit of 17. A light-year is a unit of ______ temperature? (a) Time (b) Intensity of light (a) Fahrenheit (b) Pascal (c) Mass (d) Distance (c) Celsius (d) Kelvin RRB NTPC 01.02.2021 (Shift-I) Stage Ist RRB Group-D 31-10-2018 (Shift-II) Ans : (d) A light year is a measurement of distance. A Ans : (b) Fahrenheit, Celsius and Kelvin are the units light year is the distance that a beam of light travels in a of temperature. Pascal is a unit of pressure. single Earth year or 6 trillion miles. One light year is equal to 9.461×1012 kilometres. 12. The SI unit of electrical resistivity is …………. Another units of distance are: (a) Ohm-meter (b) Ohm 1 Parsec = 3.26 light year (d) Coulomb (d) Ampere 1 Astronomical Unit = 1.496 × 1011m. RRB Group-D 04-12-2018 (Shift-III) 18. Light-year is the unit of – RRB Group-D 23-10-2018 (Shift-I) (a) Time (b) Distance Ans : (a) The electrical resistivity of a substance (c) Speed of light (d) Intensity of light indicates its ability to resist the flow of electric current RRB JE (14-12-2014, Green Paper) by the substance. Low resistivity of materials allow Ans : (b) See the explanation of above question. electric charge to flow smoothly. Its SI unit is Ohm meter (Ωm). 19. What is the SI unit of power of a lens called? (a) Hypermetropic (b) Dioptre 13. The commercial unit of electric energy is....... (c) Myopic (d) Presbyopic (a) watt (b) kW RRB NTPC 13.01.2021 (Shift-II) Stage Ist (c) kilowatt-hour (d) joule Ans : (b) Power of lens - The inverse of the focal RRB Group-D 20-09-2018 (Shift-II) length of the lens is called the power of lens. If the focal Ans : (c) The commercial unit of electric energy is the 1 kilowatt hour. A 1 kilowatt hour or a unit is the amount length of a lens is 'f' in meter, then its power 'P' = in of electrical energy that will be spent in an hour in a f circuit by an instrument of 1000 watt of power. diopters. Its SI unit is diopter which is represent by D. 1 kWh = 3.6 × 106 joule = 1 unit Myopia (Near sightedness) → A person suffering from this disease can see the near object, but is 14. The amount of radiation being emitted by a unable to see the distant object. A concave lens is radioactive material is measured using the used to correct myopia. conventional unit ––––––. Hypermetropia (Far sightedness) → A person (a) Watt (b) Pascal suffering from this disease can see distant objects (c) Ampere (d) Curie clearly but near objects are not clearly visible. A RRB NTPC 29.01.2021 (Shift-II) Stage Ist convex lens is used to correct hypermetropia. Ans : (d) The amount of radiation being emitted by a Presbyopia → Due to old age, the coordination radioactive material is measured in Curie. It is the ability of the eye decrease or ends, due to which a traditional unit of radioactivity and shows the activity of person is neither able to see distant objects nor near 1g of pure radium and is equal to 3.7×1010 objects. This defect can be corrected by using bi- disintegration/second. focal lens. Becquerel is also the SI unit of radioactivity and is 20. The SI unit of 'Magnetic Flux' is: defined as the amount of a radioactive substance (a) Farad (b) Henry showing one disintegration/second. (c) Pascal (d) Weber 15. What is measured in 'joules'? RRB NTPC 03.03.2021 (Shift-II) Stage Ist (a) Energy (b) Velocity RRB NTPC 07.04.2021 (Shift-II) Stage Ist (c) Force (d) Power Ans : (d) The measurement of the total magnetic field RRB NTPC 28.01.2021 (Shift-I) Stage Ist which passes through a given area is known as Ans : (a) magnetic flux. It is useful in describing the effects of Physical Quantity SI Unit the magnetic force acting on something occupying a Energy and Work Joule given area. The SI unit of magnetic flux is Weber and Velocity m/s. is represented by wb. Force Newton 21. Which of the following quantities has the SI Power Watt unit as Candela? Pressure Pascal (a) Impulse (b) Velocity Wavelength Angstrom (c) Force (d) Luminous intensity RRB JE CBT-II 29–08–2019 (evening) 16. Henry per meter is the unit of______. (a) Watt per steradian Ans : (d) The Candela (cd) is the SI unit of luminous intensity, which is a measure of power emitted from a (b) Electronegativity light source. (c) Magnetic permeability (d) electrical conductivity 22. The rate of doing work is called power. The unit of power is ALP Stage -II 23.01.2019 (shift - II) (a) Ampere (b) Volt Ans : (c) "Henry per Metre" is the SI unit of magnetic (c) Kelvin (d) Watt permeability. RRB NTPC 11.02.2021 (Shift-I) Stage Ist RRB Science Planner Physics 12 YCT Ans : (d) In physics, power is the rate of doing work. It Ans : (b) Momentum (P) = mass (m) × velocity (v) is the amount of energy consumed per unit of time. The = kg × m/s unit of power is the joule per second (J/s), known as the Unit of momentum (P) = kgms–1 Watt (in honor of James Watt, the eighteenth century –1 developer of the steam engine). (1 HP =746 watt). Dimensional formula of momentum = MLT 23. Unit of power is known as – 30. Unit of power in industry is – (a) Watt (b) Joule (a) Kilowatt (b) Watt (c) Newton (d) Pascal (c) Joule (d) Horsepower RRB JE (24-05-2019, Shift -I) RRB ALP & Tec.(13-08-2018, Shift-III) RRB Group-D, 01-10-2018 (Shift –II) Ans : (d) The industrial unit of power is Horsepower. RRB Group-D, 22-10-2018 (Shift –I) 1 Horsepower (HP) = 746 watt RRB ALP & Tec.(21-08-2018, Shift-I) 31. S.I. unit of electric charge is – Ans : (a) See the explanation of above question. (a) Volt (b) Coulomb 24. Which of the following units is used to measure (c) Kelvin (d) kg the intensity of sound? RRB Group-D, 26-11-2018 (Shift –III) (a) Pascal (b) Curie RRB Group-D, 04-10-2018 (Shift –II) (c) Decibel (d) Joule RRB ALP & Tec.(31-08-2018, Shift-III) RRB NTPC 25.01.2021 (Shift-I) Stage Ist RRB ALP & Tec.(10-08-2018, Shift-III) Ans : (c) The decibel is the unit used to measure the RRB NTPC Stage-Ist,28-03-2016, Shift -II intensity of sound. It is also widely used in electronics, Ans : (b) The S.I. unit of electric charge is coulomb signals and communication. and is represented by the symbol 'C'. 25. Unit used for measuring the sound is – A coulomb is defined as the amount of charge that (a) Decibel (b) Hertz passes through an electrical conductor carrying one (c) Ohm (d) Volt ampere of current in one second. RRB NTPC Stage-Ist, 22-04-2016, Shift -II Electric charge = Electric Current × Time RRB NTPC Stage-Ist, 18-04-2016, Shift -II E ⇒ Q = I. t Ans : (a) See the explanation of above question. =1I×1t 26. Which of the following units is used for = One Coulomb (c) measuring the amount of a substance? 32. S.I. unit of resistance is – (a) Lux (b) Mole (a) Coulomb (b) Ohm (c) Tesla (d) Joule (c) Joule (d) Newton RRB NTPC 28.12.2020 (Shift-I) Stage Ist RRB Group-D, 23-11-2018 (Shift –I) Ans : (b) The mole is used for measuring the amount of RRB Group-D, 31-10-2018 (Shift –II) a substance. It is the SI unit of amount of substance. RRB ALP & Tec.(09-08-2018, Shift-I) One mole contains 6.022 × 1023 molecule of the RRB NTPC Stage-Ist,26-04-2016, Shift -III substance. RRB NTPC 21.01.2021 (Shift-II) Stage Ist Tesla → SI unit of Magnetic flux density. Ans : (b) The SI unit of electrical resistance is ohm Joule → SI unit of Work and Energy. (Ω). Its denoted by 'R'. The resistance (R) of an object Lux → SI unit of Illumination. is defined as the ratio of voltage (V) across to current (I) through it. 27. What is the SI Unit of amount of substances? V (a) Radian (b) Mole Resistance (R) = ohm. (c) Jule (d) Kelvin I RPF Constable 05.02.2019 33. Ohm is unit of which physical quantity? Ans : (b) See the explanation of above question. (a) Resistance (b) Charge 28. S.I. unit of weight is - (c) Voltage (d) Current (a) Kilogram (b) Newton RRB JE (28-06-2019, Shift -IV) (c) Gram (d) Dyne Ans : (a) See the explanation of above question. RRB JE (24-05-2019, Shift-I) 34. S.I. unit of stress is – RRB Group-D, 03-10-2018 (Shift –II) (a) kg/cm2 (b) N RRB ALP & Tec.(17-08-2018, Shift-II) (c) N/m2 (d) Watt Ans : (b) The SI unit of measurement of weight is RRB SSE (21-12-2014,Set-8, Green Paper) Newton. Since weight is the force on an object due to Ans : (c) SI unit of stress is N/m2 or Pa(Pascal). It is gravity. The dyne is a derived unit of force specified represented by (σ) in the centimeter–gram–second (CGS) system 1N of units. –2 1Pa = 2 Dimensional formula of the weight is MLT m 29. Unit of momentum is – 35. S.I. unit of electric current is – (a) kgms2 (b) kgms-1 (a) Ampere (b) Coulomb (c) kgms (d) kgms-2 (c) Joule (d) Watt RRB ALP & Tec.(14-08-2018, Shift-II) RRB Group-D, 04-12-2018 (Shift –II) RRB Group-D, 23-10-2018 (Shift –I) RRB Group-D, 24-10-2018 (Shift –II) RRB Group-D, 19-09-2018 (Shift –III) RRB ALP & Tec.(30-08-2018, Shift-II) RRB Science Planner Physics 13 YCT  Ans : (a) The SI unit of electric current is ampere, (a) Pedometer (b) Parsec which is the flow of electric charge across a wire at (c) Light year (d) Length of Hubble the rate of one coulomb per second. Ampere is RRB NTPC Stage-Ist, 04-04-2016, Shift -II represented by symbol 'A'. Electric current is Ans : (c) A light year is a unit of length used to measured by using a device called an ammeter. express astronomical distances. Its equivalent to about Electrical charge (Q) = I.t 9.4607 × 1012 km. Q 42. S.I. unit of pressure is – I= amp. (a) Newton/cm2 (b) Newton-m2 t 2 36. Match the following – (c) Newton/m (d) Newton-cm2 (1) Magnetic flux density - (a) Tesla RRB Group-D, 04-10-2018 (Shift –I) (2) Self inductance - (b) Weber RRB Group-D, 01-10-2018 (Shift –III) (3) Magnetic flux - (c) Henry RRB Group-D, 25-09-2018 (Shift –II) Match – RRB Group-D, 25-09-2018 (Shift –III) (a) 1-b, 2-c, 3-a (b) 1-c, 2-a, 3-b RRB NTPC Stage-Ist, 09-04-2016, (Shift -II) (c) 1-a, 2-b, 3-c (d) 1-a, 2-c,3-b RRB JE, 25-05-2014, (Shift -III) RRB SSE (21-12-2014, Set-8, Green Paper Ans : (c) The unit of pressure in the SI system is the Ans : (d) SI unit of magnetic flux density (b) is Tesla Pascal (Pa), defined as a force of one Newton per (T). square meter. Hence one pascal is equal to the one CGS unit of magnetic flux density (b) is Gauss (G). newton per square metre. SI unit of self inductance is Henry (H). (1 Pa = 1N/m2) or (1Pa = 1N.m-2) S.I unit of magnetic flux is weber (Wb), magnetic flux The conversion between atm, Pa and torr is follows. is commonly denoted by (φs). The CGS unit is 1 atm = 101325 Pa = 760 Torr. Maxwell. 1 atm = 1.01325 Bar 37. Which unit is equal to unit of energy – 43. What is the SI unit of pressure? (a) Power (b) Density (a) Pascal (b) Radian (c) Work (d) Force (c) Ampere (d) Steradian RRB ALP & Tec.(21-08-2018, Shift-II) RRB NTPC 15.03.2021 (Shift-II) Stage Ist Ans : (c) The SI unit of energy and work is same i.e. Ans : (a) See the explanation of above question. Joule (J), named after English physicist James 44. Nm-2 is S.I. unit of – Prescott Joule (1818 - 1889). Joule discovered the (a) Force (b) Repulsion relationship between heat and mechanical work, (c) Momentum (d) Pressure which led to the development of the laws of RRB Group-D, 05-11-2018 (Shift –I) thermodynamics. Ans : (d) See the explanation of above question. 38. Which of the following has no unit – 45. The unit of approximate distance from the (a) Density (b) Relative density earth to the sun is – (c) Displacement (d) Pressure (a) Light year (b) Astronomical Unit RRB ALP & Tec.(29-08-2018, Shift-I) (c) Kelvin (d) Joule RRB Group-D, 03-12-2018 (Shift –III) RRB NTPC Stage-Ist, 16-04-2016, Shift -I Ans : (b) Relative density of a substance is defined as Ans : (b) The unit of approximate distance from the the ratio of density of the substance to the density of earth to the sun is Astronomical unit (symbol : au or water at 4ºc. AU). Density of the substance ⇒ 1AU =1.5 ×1011m Thus, Relative Density= Density of water 46. S.I. unit of force is - It has no unit. (a) Kelvin (b) Newton 39. Ampere second is the unit of – (c) Pascal (d) Volt (a) Charge (b) Power RRB NTPC Stage-Ist, 16-04-2016, Shift -II (c) Voltage (d) Energy Ans : (b) The SI unit of force is Newton or kg m/s2. RRB JE (14-12-2014, Red Paper) 1 Newton = 105 dyne Ans : (a) Ampere second is the unit of charge. Force is product of mass and acceleration Electric Charge (Q) = Ampere (I) × Second (t) ∴ Force = mass × acceleration 40. Gallon is generally used for – 47. What is the SI unit of force? (a) For velocity (a) Newton (b) Dyne (b) For a container (c) Pascal (d) Kip (c) For measuring the volume RRB NTPC 30.12.2020 (Shift-II) Stage Ist (d) None of these Ans : (a) See the explanation of above question. RRB NTPC Stage-Ist, 31-03-2016, Shift -II 48. Which of the following is not correctly Ans : (c) The gallon is a unit of measurement of matched- volume. Gallon is represented by symbol (gal). (a) Frequency - Hertz One gallon is equal to 3.7854 liters and 1 Imperial (b) Magnetic flux - Tesla gallon is equal to 4.54609 liters. (c) Pressure - Pascal 41. Which unit is used for measuring (d) Electric conductance - Siemens Astronomical distance? RRB NTPC Stage-Ist, 30-04-2016, Shift -II RRB Science Planner Physics 14 YCT  Ans : (b) 54. Which of the following two physical quantities Physical Quantities Unit have the same unit? Frequency - Hertz (a) Pressure and Force Pressure - Pascal (b) Force and Dyne Electric Conductance - Siemens or ohm–1 (Ω-1) (c) Force and Speed Magnetic flux - Weber (d) Force and Weight Note : SI unit of Magnetic Flux Density (b) is Tesla (T). RRB Group-D, 09-10-2018 (Shift–II) 49. S.I. unit of displacement is – Ans : (d) See the explanation of above question. (a) Meter (b) Kilometer 55. Newton is S.I. unit of …… ? (c) Centimeter (d) Meter per second (a) Weight and Velocity RRB Group-D, 02-11-2018 (Shift –II) (b) Weight and Force Ans : (a) The shortest distance between the starting (c) Weight and Mass and ending point is referred as displacement. (d) Weight and Acceleration Displacement always takes place in a straight line between the initial and ending or final position of the RRB Group-D, 01-10-2018 (Shift –I) body. Ans : (b) See the explanation of above question. Displacement is a vector quantity. 'Meter ' is the SI 56. Which of the following pairs does not have the unit of displacement and in CGS system, unit of same S.I. units? displacement is centimeter. (a) Speed and Velocity 50. The S.I. unit of ‘g’ is same as – (b) Work and Energy (a) Pressure (b) Momentum (c) Force and Pressure (c) Velocity (d) Acceleration (d) Displacement and distance RRB Group-D, 13-12-2018 (Shift –II) RRB Group-D, 01-10-2018 (Shift –III) Ans : (d) The S.I. unit of gravitational acceleration RRB Group-D, 05-10-2018 (Shift –II) ‘g’ is same as the S.I. unit of linear acceleration, Ans : (c) The Newton is the SI unit of force defined as The SI unit of acceleration is meter per second the force is the external factor that produces an square (m s−2). acceleration of one meter per second square in an –2 Dimensional formula of acceleration is (LT ). object of one kilogram. 2 CGS unit of acceleration = cm/s. F = mass × acceleration 51. Which of the following has same unit ? F=m×a (a) Work & Energy (b) Force & Pressure = 1 kg × 1 m/s2 = 1N (c) Force & Momentum (d) Force & Work Whereas the unit of Pressure in the SI system is RRB Group-D, 12-12-2018 (Shift –III) RRB Group-D, 03-10-2018 (Shift –II) the Pascal (Pa), defined as a force of one Newton per square meter. Ans : (a) Work and energy has the same unit. The SI unit of work and energy is the Joule (J), which is 1 Pascal (Pa) = 1 N/m2 defined as the work done by a force of 57. In the following which pair has not same unit? one Newton for the displacement of one meter. (a) Speed and Velocity Energy/Workdone (W) = Force (F) × Displacement (d) (b) Work and Energy W=1N×1m (c) Distance and Displacement W = 1 N-m = 1 Joule (d) Force and Pressure 52. Nm2kg-2 is S.I. unit of – RRB Group-D, 05-10-2018 (Shift –II) (a) Pressure Ans : (d) See the explanation of above question. (b) Momentum 58. The international unit of Speed is- (c) Acceleration (a) m/s (b) km/h (d) Universal constant of gravitation. (c) m/minute (d) km/s RRB Group-D, 01-10-2018 (Shift –I) RRB Group-D, 01-10-2018 (Shift –III) Ans : (d) Nm2kg-2 is S.I. unit of Universal constant of Ans : (a) Speed is defined as the distance covered in Gravitation (G). Distance The value of G = 6.67 × 10–11 Nm2kg-2 unit time ⇒ Speed= 53. Weight has equal S.I. unit of- Time (a) Impulse (b) Acceleration Its SI unit is metre/sec. (c) Force (d) Mass 59. ms-2 is S.I. unit of which of the following? RRB Group-D, 12-11-2018 (Shift –II) (a) Velocity (b) Speed RRB Group-D, 07-12-2018 (Shift –III) (c) Force (d) Acceleration Ans : (c) The SI unit of measurement of weight is RRB Group-D, 15-10-2018 (Shift –III) 'Newton'. Since weight is the force on an object due to RRB Group-D, 24-09-2018 (Shift –I) gravity. The dyne is a derived unit of force specified RRB Group-D, 11-10-2018 (Shift –II) in the Centimeter–Gram–Second (CGS) system RRB Group-D, 19-09-2018 (Shift –III) of units. Ans : (d) Acceleration is defined as the rate of change Force or Weight (W) = m × g of velocity with respect to time. where, W = weight or force m= mass of the object in (kg) ∆v i.e.Acceleration = g = acceleration due to gravity in (m/s2). ∆t –2 Dimensional formula of the weight is [MLT ] It is a vector quantity and its SI unit is m/s2. RRB Science Planner Physics 15 YCT 60. Which of the following has S.I. unit Joule / second? Electric Charge ( Q ) (a) Work (b) Force Electric current (I) = (c) Thrust (d) Power Time ( t ) RRB Group-D, 02-11-2018 (Shift –II) Electric current is measured using a device called Ans : (d) Power is defined as the rate of work done by a ammeter. body. 67. What is the S.I. unit of retardation ? Work (a) ms2 (b) ms ⇒ Power = (c) ms-1 (d) ms-2 Time RRB Group-D, 03-10-2018 (Shift –III) It is a scalar quantity and its SI unit is Joule/sec or Ans : (d) The SI unit of retardation is m/s2 (meter per watt (w). second square). Retardation is nothing but it is a 61. Volt is S.I. unit of……? negative acceleration that acts in the opposite (a) Resistance (b) Electric charge direction to that of motion. (c) Electric current (d) Electric potential 68. 1Pascal=? RRB Group-D, 05-10-2018(shift -I) (a) 1Nm-2 (b) 100 atmosphere Ans : (d) The SI unit for voltage is Volt and is (c) 1 dyne cm-2 (d) 1Nm2 represented by the letter 'V'. Volt is a derived SI unit RRB Group-D, 11-12-2018 (Shift –II) of electric potential. Ans : (a) 1 Pascal = 1 N/m² = 1 (kg m/sec²)/m². Voltage (V) = I × R 69. Match the following with the correct response- where, V = Voltage in (volt) (1) Watt - (a) N-m/sec I = Current in (ampere) (2) 1 Kilowatt - (b) 3.6 ×106J R = Resistance in (ohm Ω) (3) 1 Kilowatt hour - (c) 1000W 62. What is the unit of electric potential? (4) 1 Horsepower - (d) 746W (a) Volt (V) (b) Coulomb (c) (a) 1-A, 2-C, 3-B, 4-D (c) Joule (J) (d) Ampere (a) (b) 1-A, 2-C, 3-D, 4-B (c) 1-D, 2-B, 3-C, 4-A RRB JE CBT-II 31.08.2019 IInd Shift (d) 1-A, 2-B, 3-C, 4-D Ans : (a) See the explanation of above question. RRB ALP & Tec.(31-08-2018, Shift-I) 63. S.I. unit of voltage is – Ans : (a) Watt - Nm/sec (a) Coulomb (b) Joule 1kilowatt - 1000W (c) Volt (d) Watt 1 kilowatt hour - 3.6 ×106J RRB Group-D, 11-12-2018 (Shift –II) 1 Horsepower - 746W RRB Group-D, 25-10-2018 (Shift –III) 70. What is the S.I. unit of wavelength? Ans : (c) See the explanation of above question. (a) Hertz (b) Kilogram 64. Which of the following is unit of temperature - (c) Second (d) Meter (a) Degree (b) Celsius RRB JE (26-06-2019,Shift-IV) (c) Fahrenheit (d) Kelvin Ans : (d) Wavelength is the distance between two RRB Group-D, 15-11-2018 (Shift –II) successive crests or troughs of a wave. It is always Ans : (d) The SI unit of temperature according to the measured in the direction of the propagation of wave. International System of unit is Kelvin, which is The SI unit of wavelength is meter (m). represented by the symbol K. 71. Which one of these is a symbol of mole in S.I. Celsius to Kelvin, unit ? K = 0C + 273.15 (a) g (b) mol 65. Ohm-m is unit of…….? (c) kg (d) mg (a) Resistivity (b) Electric current RRB JE (28-06-2019,Shift-IV) (c) Charge (d) Resistance Ans : (b) 'Mol' is the symbol of mole in S.I. unit. RRB Group-D, 05-10-2018 (shift–II) One mole is equal to 6.023×1023 atom. Ans : (a) The S.I. unit of electrical resistivity is Ohm- Total mass Number of moles (m) = meter. Molecular mass Resistivity is the resistance offered by an object per 72. What is the unit of electric power expenditure ? unit length and per unit cross-sectional area at a (a) kWh (b) Joule specified temperature. (c) Watt (d) Volt The Ohm (symbol : Ω) is the S.I. unit of electrical RRB JE (02-06-2019,Shift-I) resistance, named in honor of German physicist Georg Ans : (a) A unit (as mentioned on the electricity bills) Simon Ohm. is represented in kWh or Kilowatt Hour. If you use 66....….. has S.I. unit ampere? 1000 Watts or 1 Kilowatt of power for 1 hour then (a) Voltage (b) Electric charge you consume 1 unit or 1 Kilowatt-Hour (kWh) of (c) Electric current (d) Resistance electricity. RRB Group-D, 03-10-2018 (Shift –III) 73. What is another name for coulomb / second ? Ans : (c) The SI unit of electric current is ampere, (a) Joule (b) Ampere which is the flow of electric charge across a wire at (c) Volt (d) Second the rate of one coulomb per second. RRB JE (28-05-2019, Shift-III) RRB Science Planner Physics 16 YCT  Ans : (b) A coulomb per second is the definition of 79. What is 746 watt called? one ampere. Ampere is the SI unit of electric current. (a) 1 horsepower (b) 1 kW 1 Q/s = 1 A. (c) 1 Pascal (d) 1 Joule RRB Group D 05-11-2018(Shift-III) Electric Charge ( Q ) Electric Current (I) = Ans : (a) See the explanation of above question. Time ( t ) 80. 1 Diopter is equal to – 1Q (a) 1 mm-1 (b) 1 m-1 -1 = = 1 ampere (c) 1 dm (d) 1 cm-1 1s RRB JE (02-06-2019,Shift-III) 74. Lux is the SI unit of Ans : (b) 1 diopter of power of a lens is described (a) Intensity of illumination as the unit of measurement of the optical power of a (b) Luminous efficiency lens which is equal to reciprocal of the focal length (c) Luminous flux (f), measured in meter. (d) Luminous intensity The SI unit of power of lens is diopter whose focal RRB JE (14-12-2019,Green Paper) length is one meter, which is denoted by the letter 'D'. Ans : (a) The SI unit of intensity of illumination 1 1 (illuminance) is lux. An illuminance of 1.0 lux is 1 diopter (d) = = produced by 1.0 lumen of light shining in an area of f ( meter ) ( meter ) 1.0 m2. = 1m–1 75. What is the S.I. unit of wave speed ? where, (f) = focal length (a) Meter (b) Meter/second 81. What does a meter equal ? (c) Second (d) Hertz (a) 10-6 micron (b) 106 micron -3 RRB JE (28-05-2019, Shift-III) (c) 10 micron (d) 103 micron Ans : (b) Speed = Wavelength × Wave Frequency RRB JE (14-12-2019,Yellow Paper) v=λ×n Ans : (b) In this equation, wavelength is measured 1 micron = 1 × 10–6 meter in meters and frequency is measured in hertz (Hz), or 1 meter = 106 micron number of vibration per second. Therefore, wave Micrometer is represented by 'µm' speed is given in metre per second, which is the SI 82. Sound pollution is measured in- unit of wave speed. (a) Decibel (b) Joule (c) Ampere (d) Ohm RRB JE (22-05-2019, Shift-IV) (ii) Measurement R.R.B. JE. Stage - II 30-08-2019 (Shift - III) Ans : (a) Sound pollution is measured in 'Decibel'. 76. A 'light year' is a unit that is use to measure: (a) Time (b) Distance 83. Loudness of sound is measured in ? (a) Resonance (b) Frequency (c) Motion (d) Speed (c) Decibel (d) Hertz RRB NTPC 14.03.2021 (Shift-II) Stage Ist RRB Group-D, 12-11-2018 (Shift –II) Ans : (b) Light year is a unit that used to measure Ans : (c) The loudness of sound is measured in units distance. A light-year is the distance that light travels in called decibels (dB). A decibel unit expresses the vacuum in one year (365.25 days). The distance that relative intensity of sounds on a scale from zero for light travels in one year is about 9.4607 × 1012 the average least perceptible sound to about 100 dB, kilometers. which is near the level most people find 77. 1 atmosphere = ? uncomfortably loud. (a) 1.01×105Pa (b) 10.1× 105Pa 84. 1 kWh = ? (c) 1.01 ×10 Pa 6 (d) 10.1 ×106Pa (a) 3.6 ×105J (b) 3.6× 10-6J RRB Group-D, 28-11-2018 (Shift –I) (c) 3.6 ×10 J 6 (d) 3.6 ×10-5J RRB Group-D, 24-11-2018 (Shift –III) RRB Group-D, 20-09-2018 (Shift –III) Ans : (a) 1 Atmosphere = 101325 Pa RRB Group-D, 18-09-2018 (Shift –II) = 1.01325 × 105 Pa RRB Group-D, 27-09-2018 (Shift –I) ∵ 1 Bar = 1 × 105 Pa RRB Group-D, 09-08-2018 (Shift –II) 1 Atmosphere = 1.01325 bar RRB ALP & Tec.(09-08-2018, Shift-I) = 1 atmosphere = 101.325 kPa Ans : (c) 1 kWh = 3.6 ×106J 1 atmosphere = 760 Torr 85. 1 kilowatt is equal to? 1 Atmosphere = 760 mm Hg column. (a) 100 watt (b) 10000watt 78. 1 horse power is equal to - (c) 10watt (d) 1000watt (a) 764 watt (b) 768 watt RRB Group-D, 26-05-2019 (Shift –III) (c) 746 watt (d) 786 watt Ans : (d) A kilowatt, is a globally recognized standard RRB ALP & Tec.(20-08-2018, Shift-II) for measuring electricity. One kilowatt is equal Ans : (c) The electrical equivalent of one horsepower to 1,000 watt or 1 KW = 1000 Joule per second. is 746 watts in the International System of Unit (SI) or Companies charge an electric bill by how much one horse power is equal to the 746 Joule per sec. electricity we use per kilowatt hour (kWh). RRB Science Planner Physics 17 YCT 86. 1 KW= ? 95. 1 coulomb/1s = ? (a) 1000Js-1 (b) 100Js-1 (a) 1 volt (b) 1 ampere -1 (c) 10Js (d) 10000Js-1 (c) 1 ohm (d) 1 watt RRB Group-D, 12-11-2018 (Shift –I) RRB Group-D, 12-10-2018 (Shift –III) Ans : (a) See the explanation of above question. Ans : (b) In terms of SI unit, 1 Coulomb is equivalent 87. 5.5 kWh = ? to one Ampere/second. (a) 14.4 × 108J (b) 14.4 × 105J 1 coulomb (c) 14.0 × 106J (d) 19.80 × 106J 1 ampere = 1 sec RRB Group-D, 04-12-2018 (Shift –II) Ans : (d) We know that, 96. 1 Pico meter = ? 1kWh = 3.6 × 106J (a) 10-11m (b) 1012m -12 5.5 kWh = 5.5×3.6×106J = 19.80 × 106J (c) 10 m (d) 1011m 88. 5.6 kWh = ? RRB Group-D, 20-09-2018 (Shift –III) (a) 20.16 × 108J (b) 14.4× 106J Ans : (c) 1 Pico meter = 10-12m (c) 14.4× 10 J 5 (d) 19.8 ×106J 97. 1 Joule = ? RRB Group-D, 22-09-2018 (Shift –II) (a) 1N ×1m (b) 1W ×1h Ans : (a) We know that, (c) 1N ×1cm (d) 1Pa ×1m 1kWh = 3.6 × 106J RRB Group-D, 15-10-2018 (Shift –II) 5.6 kWh = 5.6×3.6×106J = 20.16×106J Ans : (a) One joule is defined as the amount of energy 89. Atomic radius is measured in- exerted, when a force of one Newton is applied over (a) Millimeter (b) Centimeter an object and the displacement of object is one meter. (1 Joule = 1 N × 1 m). One joule (1 Joule = 1 watt × 1 (c) Kilogram (d) Nanometer second) is the equivalent to one watt of power RRB-JE 30.08.2019, Ist Shift radiated or dissipated for one second. Ans : (d) Atomic Radius is measured in Nanometres 98. The strength of winds is measured with the (10-19m). Atomic Radius is defined as the Shortest help of distance Nucleus to its Outermost Orbit. (a) Tintometer (b) Wind indicator 90. 1 Newton = ? (c) Barometers (d) Beaufort scale (a) 1 kg × 1 ms1 (b) 1 kg × 1 ms-2 RRB JE CBT-II 28–08–2019 (evening) (c) 1 kg × 1 ms -1 (d) 1 kg × 1 ms2 Ans : (d) The strength of winds is measured with the RRB Group-D, 10-12-2018 (Shift –III) help of Beaufort scale which starts with Zero (0) and RRB Group-D, 22-10-2018 (Shift –II) goes to a force of 12. It was developed by British Ans : (b) A Newton (N) is the international unit of Admiral Sir Francis Beaufort in 1805 to help sailors. force. One Newton is equal to 1 kilogram meter per second square. 99. Korotkoff sounds are observed during measuring the- 1m 1 N = 1 kg × 2 = 1 kg × 1 ms–2 (a) Electrical insulation sec (b) Almos