Unit and Measurement MCQs | Unit and Measurement Objective Type Questions & Answers

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Questions
21 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
22 One watt hour contains how many joules?
A 3.6 ✕ 108 J
B 3.6 ✕ 102 J
C 3.6 ✕ 103 J
D 10-3 J

Answer: 3.6 ✕ 103 J
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23 Electron volt is a unit of
A Charge
B Potential difference
C Energy
D Magnetic Force

Answer: Energy
24 What is the unit for measuring the amplitude of a sound?
A Decibel
B Coulomb
C Hum
D Cycles

Answer: Decibel
25 The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figures is
A 663.821
B 664
C 663.8
D 663.82

Answer: 664
26 The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give
A 2.75 and 2.74
B 2.74 and 2.73
C 2.75 and 2.73
D 2.74 and 2.74

Answer: 2.74 and 2.74
27 You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for √AB as:
A 1.4 m ± 0.4 m
B 1.41m ± 0.15 m
C 1.4m ± 0.3 m
D 1.4m ± 0.2 m

Answer: 1.4m ± 0.2 m
28 Young’s modulus of steel is 1.9 × 1011 N/m2. When expr essed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2)
A 1.9 × 1010
B 1.9 × 1011
C 1.9 × 1012
D 1.9 × 1013

Answer: 1.9 × 1012
29 The number of significant figures in 600 m is
A 1
B 2
C 3
D 4

Answer: 3
30 The mean length of an object is 5 cm. Which of the following measurements is most accurate?
A 4.9 cm
B 4.805 cm
C 5.25 cm
D 5.4 cm

Answer: 4.9 cm
31 Which of the following pairs of physical quantities does not have same dimensional formula?
A Work and torque.
B Angular momentum and Planck’s constant
C Tension and surface tension
D Impulse and linear momentum

Answer: Tension and surface tension
32 The equation of state of some gases can be expressed as Vander wal equation i.e. (P + a/v2)(V – b) = RT Where P is the pressure, V is the volume, T is the absolute temperature and a, b, R are constants. The dimensions of ‘a’ are:
A [M1L1T-1]
B [M1L-5T1]
C [M2L5T-1]
D [M1L5T-2]

Answer: [M1L5T-2]
33 Which of the following pairs has the same dimensions?
A Specific Heat and Latent Heat
B Impulse and Momentum
C Surface Tension and Force
D Moment of Inertia and Torque

Answer: Impulse and Momentum
34 The length and breadth of a rectangular sheet are 16.2 cm and 10.1cm, respectively. The area of the sheet in appropriate significant figures and error is
A 164 ± 3 cm2
B 163.62 ± 2.6 cm2
C 163.6 ± 2.6 cm2
D 163.62 ± 3 cm2

Answer: 164 ± 3 cm2
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