NCERT Solutions for class 11 Physics | Chapter 2 - Units and Measurements

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Questions
1 Which of the following is not the unit of time
A solar day
B parallactic second
C leap year
D lunar month

Answer:parallactic second
2 In the above question dimensions of b/c are the same as those of
A Wave velocity
B Wavelength
C Wave amplitude
D Wave frequency

Answer:Wave velocity
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3 Find the option with 3 significant figures.
A 0.0268
B 2.068
C 2.608
D 26.08

Answer:0.0268
4 Electron volt is a unit of
A Potential difference
B Electric current
C Electronic charge
D Energy

Answer:Energy
5 In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= 0.5°), then the least count of the instrument is
A One minute
B Half minute
C One degree
D Half degree

Answer:One minute
6 Which of the following is not the unit of energy?
A watt-hour
B electron-volt
C N × m
D kg × m/sec2

Answer:kg × m/sec2
7 What is the number of significant figures in 0.310×103 ?
A 6
B 2
C 4
D 3

Answer:3
8 Choose the correct statement(s)
A Topological sort can be used to obtain an evaluation order of a depending graph.
B Evaluation order for a dependency graph dicates the order in which the semantic rules are done
C Code generation is independent of the order in which the semantic actions are performed
D Both (a) and (b)

Answer:Both (a) and (b)
9 The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10–3 are
A 5, 1, 2
B 4, 4, 2
C 5, 1, 5
D 5, 5, 2

Answer:5, 1, 2
10 In case of measurement of ‘g’, if error in measurement of length of pendulum is 2%, the percentage error in time period is1 %. The maximum error in measurement of g is
A 1 %
B 2 %
C 4 %
D No error

Answer:4 %
11 The most suitable instrument for measuring the size of an atom is.
A Electron microscope
B Vernier calliper
C Optical Microscope
D Screw gauge

Answer:Electron microscope
12 The number of significant figures in the distance of one light year , 9.4605 × 1015 m is
A thirty
B five
C four
D three

Answer:five
13 A student measures the distance covered and time taken by a body under free fall which was intially at rest. He uses this data for estimating g, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are e1 and e2 respectively, then the maximum possible percentage error in the estimation of g is
A e2 - e2
B e2 + 2e2
C e2 + e2
D e2 - 2e2

Answer:e2 + 2e2
14 Two physical quantities whose dimensions are not same, cannot be :
A multiplied with each other
B divided
C added or substracted in the same expression
D added together

Answer:added or substracted in the same expression
15 Dimensions cannot be used to
A check dimensional correctness of a formula
B convert units
C find value of the constant of proportionality in an equation
D deduce a relation among physical quantities

Answer:find value of the constant of proportionality in an equation
16 Identify the pair whose dimensions are equal.
A Torque and work
B Stress and energy
C Force and stress
D Force and work

Answer:Torque and work
17 Which of the following physical quantities has different dimensions?
A Energy
B Watt hour
C Momentum
D Work

Answer:Momentum
18 Out of the following pairs, which one does not have identical dimensions ?
A Angular momentum and Planck's constant
B Impulse and momentum
C Moment of inertia and moment of a force
D Work and torque

Answer:Moment of inertia and moment of a force
19 The surface tension of a liquid is 70 dyne/cm. In MKS system its value is?
A 70 N/m
B 7 ✕ 10-2 N/m
C 7 ✕ 102 N/m
D 7 ✕ 103 N/m

Answer:7 ✕ 10-2 N/m
20 At 4° C, the density of water is equal to
A 10-3 kg m-3
B 10-2 kg m-3
C 10 kg m-3
D 103 kg m-3

Answer:103 kg m-3

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