Physics: Units, Laws, and Measurements

Physics & General Science

• The S.I. unit of power is the Watt.
• The least count of a micrometer screw with a pitch of 0.5 mm and 50 circular scale divisions is 0.01 mm.
• 10 dyne equals 10⁻⁵ N.
• The unit of energy in the CGS system is the erg.
• The mean absolute error for a set of refractive index values needs to be calculated using the standard deviation of the mean formula.
• A Vernier caliper is used to measure the inner diameter of a ring.
• Newton's second law is mathematically expressed as F = ma (Force = mass x acceleration).
• Given a force of 30 N applied to a 5 kg object, the acceleration produced is 6 m/s².
• China wares being wrapped in paper and bogies of a train being provided with buffers are examples of impulse of force.
• A body in vertical circular motion experiences force of gravity, centripetal and centrifugal forces where friction can be negligible.
• Gravitational, magnetic, and electrical forces are all field forces.
• The work done by external forces on a system equals the change in kinetic energy.
• For a 6V battery across a resistance R with a current of 0.4 mA, the value of R is 15 kΩ (using Ohm's Law, R = V/I).
• The unit of permittivity is C²/Nm².
• Electric flux depends on electric field intensity, area, and the angle between the surface and the electric field.
• Conductance is the inverse of resistance.
• The effective resistance of two resistors (10 Ω and 20 Ω) in parallel is 6.6 Ω.
• The unit of capacitance is Q/V.
• The increasing order of thermal conductivity for the metals mentioned is: Iron, Aluminum, Copper, Silver.
• Celsius and Fahrenheit are equal at -40 degrees.
• The unit of heat capacity is J/K.
• With rising temperatures, thermal conductivity typically increases.
• The mathematical formula for specific heat is C = Q / mΔT.
• A temperature of 104°F is equivalent to 40°C.
• Sound wave is not a type of electromagnetic wave.
• Light wave is a transverse wave.
• Given a sound wave frequency of 2 kHz and a wavelength of 2 m, calculate speed as 4000 m/s.
• Divergence is not a characteristic of LASER light.
• Optical fibers work on the principle of total internal reflection.
• The reverbaration time can be calculated as approximately 9.6 seconds for an auditorium of given volume and with given total absorption

Chemistry

• Burning of coal is an example of a decomposition process.
• The reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl is a double displacement reaction.
• The balanced chemical equation for zinc reacting with sulfuric acid to give zinc sulfate and hydrogen is Zn + H₂SO₄ → ZnSO₄ + H₂
• The outer layer of teeth is made up of calcium phosphate.
• A neutral salt solution with a pH of 7 is formed by KNO₃
• Metal oxide + Acid yields Salt + Water
• The molecular formula of sodium zincate is Na₂ZnO₂.
• Fluorine has 7 electrons in its outermost shell.
• Applying a coating of zinc is suitable for preventing an iron frying pan from rusting.
• Gold is a highly malleable metal.

Computer Science and General Knowledge

• Label is not a valid data type in MS-Excel.
• The maximum zoom percentage in MS-PowerPoint is 400.
• The "Magic tool" is not a feature in MS-Word.
• A CPU consists of an ALU and a CU (Control Unit).
• Microsoft Office is not an operating system.
• Nitrate is commonly associated with the "blue baby syndrome" in infants.
• Clouds are present in the Troposphere layer of the atmosphere.
• CFCs are not recommended to be used in refrigerators because they deplete the ozone layer.
• Modern solar photovoltaic (PV) panels have an efficiency range of 15-20% in converting sunlight to electricity.
• Particulate matter (PM10) is primarily responsible for causing respiratory problems and cardiovascular diseases in humans.

Mathematics

• Requires knowledge of matrix operations to find a value like (AB)^T given A and B.
• Calculation of a determinant given a 3x3 matrix.
• Finding an inverse of a 2x2 matrix.
• Vector algebra skills (dot product) is required to determine the value of a that makes two vectors prependicular.
• Requires knowledge of the circle equation to determine the unknow parameter.
• Determine the equation of a line given the coordinates of two points on the line.
• Requires knowledge in limits to calculate the limit of a function as x approaches 0.
• Requires knowledged in limits to calculate the limit of a function as x approaches infinity.
• Requires knowledge in logs to calculate the value for the log function.
• The derivative of cos²x is -sin2x.
• Standard integrals for trig functions are required to solve.
• The mean of the observations can be calculated as 9.

Reading Comprehension

• Black powder was invented in China according to some historians.
• Roger Bacon was an English Monk.
• Roger Bacon wrote about black powder in code language.
• "Shukranti" was written two thousand years ago.
• The word "pyrotechnics" originates from the Greek language.

Communication and English Grammar

• Verbal communication can be in written or oral form.
• Tone of voice, voice quality, style of speaking, stress, and intonation are part of paralanguage.
• The process of communication is a two-way process.
• A hindrance that disturbs the communication process is known as a barrier.
• Physical appearance is an example of non-verbal communication.
• The Sender's address is written at the top of a business letter on the left-hand side.
• The salutation is placed just below the date in a business letter.
• A Photo is not a part of the business letter.
• A letter is incomplete and worthless without a Signature.
• The full form of C.O.D. is Cash on delivery.
• In the sentence "Hurrah! I have passed the examination," "Hurrah!" is the interjection.
• Correct sentence: The dog is sitting under the cot.
• Correct sentence: The Sun rises in the East.
• Correct sentence: Your family is a happy family.
• The correct option is "any" to complete the interrogative question "Do you have any doubt in this question paper?".
• correct spelling is Playwright
• correct spelling Entrepreneur
• B) People were coming, going and ignoring him.
• A) I like drawing my coworkers and my cat.
• C) The ship was wrecked, and every man, woman and child is drowned.