Unit and Measurement Objective Type Questions & Answers

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

View Answer

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

View Answer

Answer: 3.6 ✕ 103 J

Article and Schedule Quiz	Start Test!

DOWNLOAD CURRENT AFFAIRS PDF FROM APP

23 Electron volt is a unit of

A Charge

B Potential difference

C Energy

D Magnetic Force

View Answer

Answer: Energy

24 What is the unit for measuring the amplitude of a sound?

A Decibel

B Coulomb

C Hum

D Cycles

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: 1.9 × 1012

29 The number of significant figures in 600 m is

A 1

B 2

C 3

D 4

View Answer

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

View Answer

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

View Answer

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]

View Answer

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

View Answer

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

View Answer

Answer: 164 ± 3 cm2

ADRE 2.0 FULL LENGTH MOCK TEST

Take Mock Tests

Missiles Mock Test	Start Test!
SSC MTS Mock Test	Start Test
IBPS CLERK MOCK TEST	Start Test
SSC MTS 2022 JULY 26 Shift 1 (ENGLISH)	Start Test!
SSC GD Previous Year Paper 2021 Nov 17 Shift - I (Hindi)	Start Test!
SSC CGL Tier - 1 PYP 2022 April 21 Shift- 1 (ENGLISH)	Start Test!
MPSC PAPER I MOCK TEST 1 (ENGLISH)	Start Test!
IB Security Assistant Mock test 1 (english)	Start Test!
UP POLICE CONSTABLE MOCK TEST 1	Start Test!
DELHI POLICE CONSTABLE MOCK TEST 1 (HINDI)	Start Test!