﻿ Engineering Entrance Exam Question and Answers | Units and Measurement - Zigya

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# Units and Measurement

#### Multiple Choice Questions

41.

A body is moving at a speed near 0.3 ms-1. To measure its speed with an accuracy about 1%, using a sampling distance 3 mm, the measuring clock should have a least count of the order of

• 0.1 s

• 0.01 s

• 0.001 s

• 0.0001 s

42.

The dimensions of $\frac{\mathrm{a}}{\mathrm{b}}$ in the equation where, p is pressure, x is distance and and t is time, are

• [M2LT-3]

• [MT-2]

• [LT-3]

• [ML3T-1]

43.

The dimensional formula for inductance is

• [ML2T-2A-2]

• [ML2TA-2]

• [ML2T-1A-2]

• [ML2T-2A-1]

44.

The physical quantity having the same dimensions as Planck's constant h is

• linear momentum

• angular momentum

• Boltzmann constant

• force

45.

SI unit of permittivity is

• C2m2N2

• C2m-2N-1

• C2m2N-1

• C-1m2N-2

46.

Out of the following four dimensional quantities, which one qualifies to be called a dimensional constant ?

• Acceleration due to gravity

• Surface tension of water

• Weight of a standard kilogram mass

• The velocity of light in vacuum

47.

The physical quantity having the dimensions [M-1L-3T3A2] is

• resistance

• resistivity

• electrical conductivity

• electromotive force

48.

The dimensional formula for impulse is

• [MLT-1]

• [ML-1T]

• [M-1LT-1]

• [ML-1T-1]

49.

Dimensional formula for the universal gravitational constant G is

• [M-1L2T-2]

• [M0L0T0]

• [M-1L3T-2]

• [M-1L3T-1]

50.

The number of significant figures in the numbers 4.8000 x 104 and 48000.50 are respectively

• 5 and 6

• 5 and 7

• 2 and 7

• 2 and 6