Physics MCQ Unit 1 PDF

# Basic Science - Physics (Sem. 1/MSBTE) ## Units and Measurements ### 1.14 Important Formulae: 1. **Mean (True) value:** $$ \bar{x} = \frac{\sum x}{n}$$ 2. **Absolute error:** | Absolute error for measurement x | = | x - $\bar{x}$ | | Absolute error for measurement x | = | $\bar{x...

# Basic Science - Physics (Sem. 1/MSBTE) ## Units and Measurements ### 1.14 Important Formulae: 1. **Mean (True) value:** $$ \bar{x} = \frac{\sum x}{n}$$ 2. **Absolute error:** | Absolute error for measurement x | = | x - $\bar{x}$ | | Absolute error for measurement x | = | $\bar{x}$ - x| 3. **Mean (Average) absolute error:** $$ | \Delta \bar{x}| = \frac{\sum | \Delta x |}{n} = \frac{|\Delta x_1| + |\Delta x_2| + ....+ |\Delta x_n|}{n}$$ 4. **Relative error:** $$Relative error = \frac{|\Delta \bar{x}|}{\bar{x}}$$ 5. **Percentage error:** $$Percentage error = \frac{|\Delta \bar{x}|}{\bar{x}} \times 100$$ ### 1.15 Multiple Choice Questions with Answers: **Q.1** A ______ is defined as any quantity that can be measured. *(a) Unit (b) physical quantity (c) derived unit (d) none of these* **Ans.** (b) **Q.2** _______ physical quantities are defined only by a number and unit.\ *(a) scalar (b) vector (c) derived (d) none of these* **Ans.** (a) **Q.3** ______ physical quantities are defined by a magnitude and direction.\ *(a) magnitude (b) speed (c) length (d) none of these* **Ans.** (b) **Q.4** Out of the following ______ is not a scalar quantity.\ *(a) length (b) mass (c) time (d) displacement* **Ans.** (d) **Q. 5** Out of the following _______ is a scalar quantity.\ *(a) Velocity (b) Force (c) time (d) displacement* **Ans.** (c) **Q. 6** Displacement is a ____ quantity.\ *(a) Scalar (b) vector (c) derived (d) none of these* **Ans.** (b) **Q. 7** In 10 m rod length, 10 represents ______ and represents ______\ *(a) Unit, magnitude (b) Magnitude, unit (c) Direction, unit (d) Direction, magnitude* **Ans.** (b) **Q. 8** Mass, length, time etc. are examples of _____.\ *(a) Physical quantity (b) Fundamental units (c) Derived units (d) None of these* **Ans.** (a) **Q. 9** A ______ is defined as the reference standard used for the measurement of a physical quantity.\ *(a) Physical quantity (b) unit (c) system (d) None of these* **Ans.** (d) **Q. 10** There are _____ fundamental quantities.\ *(a) 1 (b) 5 (c) 7 (d) 10* **Ans.** (d) **Q. 11** ______ is a supplementary quantity.\ *(a) Temperature (b) solid angle (c) Electric current (d) time* **Ans.** (b) **Q. 12** The value of x in 1 kg/m³ = 10^x gm / cm³ is\ *(a) 1 (b) 2 (c) -3 (d) -4* **Ans.** (d) **Q. 13** The fundamental unit out of the following is ______\ *(a) Ampere (b) m/s (c) Watt (d) Newton*\ **Ans.** (a) **Q. 14** The unit of volume are ______\ *(a) cm² (b) m² (c) m³ (d) m/s* **Ans.** (c) **Q. 15** The volume of a cube is ______ if its side is 4 m.\ *(a) 4 m (b) 16 m³ (c) 64 m² (d) 64 m³* **Ans.** (d) **Q. 16** The unit of luminous intensity is _______ \ *(a) Kelvin (b) mole (c) ampere (d) Candela* **Ans.** (d) **Q. 17** The unit to measure ______ is light year.\ *(a) Time (b) Distance (c) Speed (d) Luminous Flux* **Ans.** (b) **Q. 18** The unit of heat energy in MKS system is ______\ *(a) cal (b) kcal (c) btu (d) joule* **Ans.** (d) **Q. 19** 1 Newton = 10⁶ dynes.\ *(a) 10⁶ (b) 100 (c) 10⁴ (d) 10³* **Ans.** (b) **Q. 20** The unit of ______ is kW-h.\ *(a) Voltage (b) Power (c) Energy (d) current*\ **Ans.** (c) **Q. 21** Watt is the unit of ______\ *(a) Voltage (b) Current (c) power (d) energy* **Ans.** (c) **Q. 22** Micro, milli etc are called as ______\ *(a) fundamental units (b) prefixes (c) derived units (d) none of these* **Ans.** (b) **Q. 23** 1 GW = ______ kW.\ *(a) 10³ (b) 10⁶ (c) 100 (d) 10⁹* **Ans.** (d) **Q. 24** If the length of a rod is 5 m, here 5 is ______\ *(a) standard (b) unit (c) magnitude (d) Quantity* **Ans.** (c) **Q. 25** The common unit of a physical quantity in M.K.S and S.I. systems is ______\ *(a) Joule/sec (b) Mole (c) Ampere (d) Kelvin* **Ans.** (d) **Q. 26** ______ is the common fundamental C.G.S., F.P.S and M.K.S systems. *(a) Foot (b) Sec (c) Kilo gram (d) Pound* **Ans.** (b) **Q. 27** Unit and derived units are the two types of units. \ *(a) Base (b) Derived (c) Physical (d) None of these* **Ans.** (a) **Q. 28** ______ is a derived quantity. *(a) Temperature (b) solid angle (c) speed (d) time* **Ans.** (c) **Q. 29** ______ system of units is known as the British system. *(a) CGS (b) MKS (c) FPS (d) SI* **Ans.** (c) **Q. 30** The unit of mass is ______ in FPS system.\ *(a) Gram (b) Kilogram (c) Pound (d) None of these* **Ans.** (c) **Q. 31** The unit of length is ______ in FPS system.\ *(a) cm (b) m (c) foot (d) None of these* **Ans.** (c) **Q. 32** The unit of force is ______ in CGS system. *(a) cal (b) dyne (c) Newton (d) pound force* **Ans.** (b) **Q. 33** Corresponding SI unit of kg/m³ is ______ \ *(a) kg/m (b) Kg/m² (c) kg/m³ (d) None of these* **Ans.** (c) **Q. 34** Mass is one of the ______ physical quantities.\ *(a) fundamental (b) derived (c) basic (d) None of these* **Ans.** (a) **Q. 35** Angular velocity has the units ______\ *(a) rad (b) rad/s (c) rad²/s (d) rad^-1* **Ans.** (b) **Q. 36** The S.I unit of K.E is ______ times that of C.G.S unit of K.E. *(a) 10⁷ (b) 10⁵ (c) 10^-5 (d) 10^-7* **Ans.** (d) **Q. 37** The unit of energy in SI system is ______\ *(a) Newton (b) N/sec (c) N-sec (d) None of the above* **Ans.** (d) **Q. 38** The unit of energy in SI system is ______\ *(a) Newton (b) N/sec (c) N-sec (d) None of the above* **Ans.** (d) **Q. 39** Out of the following ______ is not the unit of power.\ *(a) Watt (b) joule/hr (c) Nm/sec (d) N/sec* **Ans.** (d) **Q. 40** The physical quantity ______ has the units of mass.\ *(a) Density (b) Momentum (c) Inertia (d) Moment of force* **Ans.** (c) **Q. 41** ______ is the unit of amount of substance. \ *(a) Ampere (b) radian (c) Mole (d) candela* **Ans.** (c) **Q. 42** Out of the following ______ is a derived unit?\ *(a) Mole (b) candela (c) kilogram (d) Newton* **Ans.** (d) **Q. 43** ______ of the following is not a physical quantity.\ *(a) kelvin (b) temperature (c) pressure (d) none of these* **Ans.** (d) **Q. 44** SI unit of pressure is ______\ *(a) dyn/cm (b) dyne /cm² (c) N/m (d) N/m²* **Ans.** (d) **Q. 45** ______ is the SI unit of charge. *(a) Newton (b) Coulomb (c) Faraday (d) None of these* **Ans.** (b) **Q. 46** Of the following, which has Hertz as its S.I. unit. *(a) Frequency (b) Charge (c) Force (d) None of these* **Ans.** (a) **Q. 47** Of the following units is not a derived unit.\ *(a) Newton (b) Ampere (c) Watt (d) Joule/sec* **Ans.** (b) **Q. 48** 1 cm = ______ m.\ *(a) 10 (b) 100 (c) 10^-1 (d) 10^-2* **Ans.** (d) **Q. 49** 1 gigahertz = ______ kilohertz.\ *(a) 10³ (b) 10⁶ (c) 10⁹ (d) 10¹²* **Ans.** (c) **Q. 50** ______ is a dimensionless quantity. *(a) refractive index (b) force (c) electric current (d) work* **Ans.** (a) **Q. 51** ______ = force x time. *(a) Temperature (b) Impulse (c) Force (d) Force* **Ans.** (b) **Q. 52** The units of ______ are Newton-second. *(a) Velocity (b) Acceleration (c) density (d) impulse* **Ans.** (b) **Q. 53** The units of ______ are kg/m³. *(a) Density (b) Speed (c) Acceleration (d) None of these* **Ans.** (a) **Q. 54** Out of the following quantities, which quantity is measured in m/s². *(a) Length (b) speed (c) acceleration (d) volume* **Ans.** (c) **Q. 55** ______ is the standard unit for length. *(a) Centimetre (b) Inch (c) Foot (d) metre* **Ans.** (d) **Q. 56** The ______ physical quantities are independent of each other. *(a) Derived (b) Fundamental (c) Numerical (d) All these* **Ans.** (b) **Q. 57** ______ = distance / time. *(a) Length (b) Speed (c) Acceleration (d) Pressure* **Ans.** (b) **Q. 58** ______ is the unit of energy. *(a) Joule (b) cal (c) Kcal (d) Kelvin* **Ans.** (a) **Q. 59** The ______ system is also called as metric system. *(a) CGS (b) MKS (c) FPS (d) Both a and b* **Ans.** (d) **Q. 60** 1 pico corresponds to ______. *(a) 10^-3 (b) 10^-6 (c) 10^-9 (d) 10^-12* **Ans.** (d) **Q. 61** The SI units of mass, length and time are ______ respectively. *(a) g, cm and s *(b) kg, cm and s *(c) kg, cm and s *(d) kg, m and s* **Ans.** (d) **Q. 62** We can measure and express any physical quantity in terms of a number (magnitude) and ______. *(a) Unit (b) dimensions (c) place (d) None of these* **Ans.** (b) **Q. 63** The ______ quantities depend on one or more quantities for their measurement. *(a) fundamental, fundamental (b) derived, fundamental (c) fundamental, derived (d) derived, derive* **Ans.** (b) **Q. 64** There are ______ fundamental units. *(a) 4 (b) 6 (c) 8 (d) 7* **Ans.** (d) **Q. 65** Momentum = ______ *(a) mass x displacement (b) mass x velocity (c) mass x acceleration (d) force x time* **Ans.** (b) **Q. 66** The SI unit of solid angle is ______ *(a) Degree (b) Mole (c) Radian (d) Steradian* **Ans.** (d) **Q. 67** Units are of ______ types. *(a) one (b) two (c) three (d) infinite* **Ans.** (d) **Q. 68** Acceleration = ______. *(a) Mass x time (b) Change in velocity / time (c) Mass / time² (d) Force x displacement* **Ans.** (b) **Q. 69** S.I. stands for ______ *(a) Internal system (b) System Internationale (c) International seminar (d) None of these* **Ans.** (b) **Q. 70** One metre = ______ nanometer. *(a) 10⁶ (b) 10⁸ (c) 10⁹ (d) 10¹²* **Ans.** (c) **Q. 71** ______ is measured in Joule. *(a) Energy (b) Temperature (c) Pressure (d) Acceleration* **Ans.** (a) **Q. 72** The derived quantity out of the following is ______ *(a) Length (b) Time (c) Mass (d) Force* **Ans.** (d) **Q. 73** 1 joule = ______ Erg. *(a) 10² (b) 10⁴ (c) 10⁶ (d) 10⁷* **Ans.** (d) **Q. 74** Ampere is the unit of ______ *(a) Resistance (b) Voltage (c) Current (d) Power* **Ans.** (c) **Q. 75** ______ is the derived unit of area. *(a) m (b) m² (c) m³ (d) m^-1* **Ans.** (b) **Q. 76** The physical quantity with no unit and dimensions is ______ *(a) Pressure *(b) Strain *(c) Force *(d) None of these* **Ans.** (b) **Q. 77** ______ is the physical quantity that has units but no dimensions. *(a) Pressure *(b) Strain *(c) Angle *(d) None of these* **Ans.** (c) **Q. 78** Density has the units of ______ *(a) kg m² *(b) kg m^-3 *(c) kg m³ *(d) kg m* **Ans.** (c) **Q. 79** Dimensions are expressed in terms of ______ *(a) LMT *(b) LAM *(c) LMK *(d) LMC* **Ans.** (a) **Q. 80** Dimensional formula for speed is ______ *(a) [L⁰M⁰T^-1 ] *(b) [L¹M⁰T^-1 ] *(c) [L¹M⁰T⁰ ] *(d) [L¹M¹T^-1 ]* **Ans.** (b) **Q. 81** Dimensional formula for volume is ______ *(a) [L⁰M⁰T^-1 ] *(b) [L¹M⁰T^-1 ] *(c) [L³MT⁰ ] *(d) [L²M⁰T⁰ ]* **Ans.** (c) **Q. 82** Dimensional formula for area is ______ *(a) [L¹M⁰T^-1 ] *(b) [L¹M⁰T⁰ ] *(c) [L³MT⁰ ] *(d) [L²M⁰T⁰ ]* **Ans.** (d) **Q. 83** 1 m² is ______ cm². *(a) 10^-4 *(b) 10⁴ *(c) 10³ *(d) 10⁵* **Ans.** (b) **Q. 84** The dimensional formula of the physical quantity whose dimensional S.I unit is Newton is ______ *(a) [L¹M¹T^-2 ] *(b) [L¹M¹T^-1 ] *(c) [L¹M¹T² ] *(d) [L²M²T^-2 ]* **Ans.** (b) **Q. 85** The physical quantity whose dimensional formula is [L²M⁰T⁰ ] is ______\ *(a) Speed *(b) Area *(c) Volume *(d) Acceleration* **Ans.** (b) **Q. 86** ______ of the following is a dimensionally correct formula. *(a) S = ut + at² *(b) S = ut+at *(c) S=ut+ar² *(d) S = ur² + ar²* **Ans.** (a) **Q. 87** If M^xL^yT^z is the dimensional formula of acceleration, find the value of x + y - z.\ *(a) 4 *(b) -2 *(c) 3 *(d) 1* **Ans.** (c) **Q. 88** ______ out of the following equations is dimensionally correct equation. *(a) V = ut + at³ *(b) vt = u + a *(c) V = at/u *(d) v + u = at* **Ans.** (d) **Q. 89** The dimensional formula of pressure is ______ *(a) [M⁰L²T^-1 ] *(b) [M¹L^-2T^-1 ] *(c) [L¹M¹T^-2 ] *(d) [M⁰L^-1T^-2 ]* **Ans.** (d) **Q. 90** The dimensions [L¹M⁰T^-2 ] are of ______ *(a) Force *(b) Acceleration *(c) Speed *(d) None of these* **Ans.** (b) **Q. 91** The dimensional equation of frequency is ______ *(a) [L⁰M⁰T^-1 ] *(b) [L¹M⁰T^-1 ] *(c) [L⁰M²T^-1 ] *(d) [L⁰M⁰T² ]* **Ans.** (d) **Q. 92** The dimensional formula for mass is ______ *(a) [L¹M¹T⁰ ] *(b) [L⁰M¹T⁰ ] *(c) [L⁰M²T^-1 ] *(d) [L⁰M²T^-2 ]* **Ans.** (b) **Q. 93** Dimensional formula of work is ______ *(a) [L⁰M²T^-2 ] *(b) [L²M⁰T^-2 ] *(c) [L²M²T^-1 ] *(d) [L²M²T^-2 ]* **Ans.** (b) **Q. 94** The pair of physical quantities that have same dimensional formula is ______ *(a) Impulse, Inertia *(b) Velocity, Impulse *(c) Force, work *(d) Angular momentum, Linear momentum* **Ans.** (a) **Q. 95** [L²M¹T^-3 ] is the dimensional equation of ______ *(a) power *(b) speed *(c) acceleration *(d) pressure* **Ans.** (a) **Q. 96** If [L^aM^bT^c] is the dimensional equation of power, find the value of 4a+b-5c. *(a) 26 *(b) 24 *(c) -6 *(d) None of these* **Ans.** (b) **Q. 97** If [L^aM^bT^c] is the dimensional formula of density, then the value of x + 2y - 3z is ______. *(a) 5 *(b) 1 *(c) 3 *(d) -1* **Ans.** (d) **Q. 98** Dimension equation [L^-3M²T⁰] corresponds to the physical quantity ______ *(a) Volume *(b) area *(c) Density *(d) speed* **Ans.** (c) **Q. 99** The dimension of refractive index is ______ *(a) [L⁰MT⁰ ] *(b) [L¹M¹T^-1 ] *(c) [L¹M⁰T⁰ ] *(d) [L⁰M⁰T⁰ ]* **Ans.** (d) **Q. 100** ______ is defined as the difference between the true value and measured value of a physical quantity. *(a) error *(b) significant figure *(c) mistake *(d) none of these* **Ans.** (a) **Q. 101** There are ______ different types of errors. *(a) 1 *(b) 2 *(c) 3 *(d) 4* **Ans.** (d) **Q. 102** ______ error is caused due to faulty calibration of an instrument. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (b) **Q. 103** ______ error is also called as constant error. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (b) **Q. 104** ______ error is caused by defective setting of an instrument. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (a) **Q. 105** ______ error is also called as persistent error. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (b) **Q. 106** ______ error is caused due to fault of observer taking readings. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (c) **Q. 107** ______ error is also called as human error. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (c) **Q. 108** ______ error is caused due to different factors such as change in temperature, pressure or fluctuation in voltage while performing the experiment. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (d) **Q. 109** ______ error is also called as accidental error. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (d) **Q. 110** ______ error can be minimized by taking the same measurement with different accurate instruments. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (a) **Q. 111** ______ error can be minimized by detecting its causes. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (d) **Q. 112** ______ error can be minimized but cannot be eliminated. *(a) Instrumental *(b) Systematic *(c) Personal *(d) Random* **Ans.** (b) **Q. 113** We can minimize errors by taking a large ______ of the quantity to be measured. *(a) Number *(b) magnitude *(c) Frequency *(d) None of these* **Ans.** (b) **Q. 114** We can minimize errors by taking a large number readings and calculate their ______ value. *(a) Standard *(b) mean *(c) Time average *(d) None of these* **Ans.** (b) **Q. 115** We can minimize errors by using instruments with their ______ as small as possible. *(a) Least count *(b) LSB *(c) MSB *(d) None of these* **Ans.** (a) **Q. 116** We calculate the mean value of the physical quantity to be measured and consider it as its ______ value. *(a) Average *(b) true *(c) Time average *(d) None of these* **Ans.** (b) **Q. 117** The mean value for a physical quantity with measured values 4.5, 4.8, 4.4 and 4.6 is ______. *(a) 4.755 *(b) 4.575 *(c) 4.557 *(d) None of these* **Ans.** (b) **Q. 118** The mean value is also called as ______ value. *(a) Normal *(b) numerical *(c) most probable *(d) None of these* **Ans.** (c) **Q. 119** The ______ error is defined as the magnitude of difference between mean value and each individual measured value of a physical quantity. *(a) Absolute *(b) Mean absolute *(c) Relative *(d) Percentage* **Ans.** (a) **Q. 120** The ______ error is defined as the arithmetic mean of all the absolute errors. *(a) Absolute *(b) Mean absolute *(c) Relative *(d) Percentage* **Ans.** (b) **Q. 121** The ______ error is defined as the ratio of the mean absolute error in the measurement of a physical quantity to its most probable value (mean value). *(a) Absolute *(b) Mean absolute *(c) Relative *(d) Percentage* **Ans.** (c) **Q. 122** If the measured value of a resistance and its true value are 1.32 ohm, whereas its value of 1.3 ohm, then the absolute error of the measurement is ______ *(a) 0.02 ohm *(b) 0.2 ohm *(c) 2.62 ohm *(d) None of these* **Ans.** (a) **Q. 123** The number of significant figures in 3.68 × 10² is ______ *(a) 2 *(b) 3 *(c) 4 *(d) 5* **Ans.** (b) **Q. 124** The number of significant figures in 23.700 are ______ *(a) 2 *(b) 4 *(c) 3 *(d) 5* **Ans.** (d) **Q. 125** The multiplication of 10.610 with 0.210 up to 4 correct number of significant figure is ______ *(a) 2.2281 *(b) 2.228 *(c) 2.22 *(d) 2.2* **Ans.** (b) **Q. 126** If 2% error is present in the measurement of radius of a circle, then the error in measurement of its area is ______ *(a) 1% *(b) 2% *(c) 3% *(d) 4%* **Ans.** (c) **Q. 127** The number of significant figure in 0.0604 is ______ *(a) 1 *(b) 2 *(c) 3 *(d) 5* **Ans.** (c) **Q. 128** The ______ error determines accuracy of measurement . *(a) percentage *(b) relative *(c) absolute *(d) mean absolute* **Ans.** (d) **Q. 129** If three measurements of 9.1 W, 9.2 W and 8.7 W are made as an experiment then the result with correct number of significant figures is ______ *(a) 9.1 W *(b) 9 W *(c) 9.0 W *(d) none of these* **Ans.** (c) **Q. 130** If the error in the current measurement is 2%, and that in the resistance measurement is 1% then the maximum error in the voltage measurement is ______. *(a) 1% *(b) 2% *(c) 3% *(d) none of these* **Ans.** (b) **Q. 131** The percentage error is given by ______ ×100. *(a) absolute error *(b) relative error *(c) Mean absolute error *(d) None of these* **Ans.** (b) **Q. 132** The number 14.750 can be rounded off to three significant digits as ______ *(a) 147 *(b) 1.475 *(c) 14.8 *(d) 1.47 × 10¹* **Ans.** (c) **Q. 133** The result of (25.2 × 1374) / 33.3 is ______ *(a) 1039 *(b) 1040 *(c) 1039.7 *(d) None of these* **Ans.** (b) **Q. 134** If the error in measurement of length is ±1 mm in 150 mm then, the % error in the measurement is ______ *(a) 0.33% *(b) 0.67% *(c) 1.33% *(d) 1.44%* **Ans.** (a) **Q. 135** Number of significant figures in the number 0.07030 is ______ *(a) 6 *(b) 5 *(c) 4 *(d) 3* **Ans.** (c) **Q. 136** Number of significant figures in 0.00650 is ______ *(a) 0 *(b) 1 *(c) 2 *(d) 3* **Ans.** (b) **Q. 137** We can represent number 0.0000234 in scientific notation as ______ *(a) 2.34 × 10^-5 *(b) 234 × 10^-5 *(c) 2.34 × 10^-4 *(d) 23.4 × 10^-5* **Ans.** (a) **Q. 138** Prefix for 3400000 W is ______ *(a) 34 MW *(b) 3.4 MW *(c) 340 MW *(d) 3400 MW* **Ans.** (c) **Q. 139** The four different readings of length of box are 30.5 cm, 30.6 cm, 30.6 cm and 30.4 cm. The mean reading will be ______ *(a) 30.53 *(b) 30.52 *(c) 30.5 *(d) 30.62* **Ans.** (b) **Q. 140** We can round of 2.45 to ______. *(a) 2.5 *(b) 2.3 *(c) 2.4 *(d) 2.6* **Ans.** (a) **Q. 141** Zeros coming in between two non-zero numbers are ______. *(a) not significant *(b) significant *(c) sometimes significant *(d) None of these* **Ans.** (b) **Q. 142** The number of significant figures in 1.070 is ______ *(a) 2 *(b) 4 *(c) 3 *(d)