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Measurement MCQs for NEET — Physics Questions with Answers

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Which one of the following is not a unit of young's modulus

$N m^{- 1}$

$N m^{- 2}$

$D y n e c m^{- 2}$

Mega Pascal

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Explanation

$N m^{- 1}$

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In C.G.S. system the magnitutde of the force is 100 dynes. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is

0.036

0.36

3.6

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Explanation

$n_{2} = n_{1} {(\frac{M_{1}}{M_{2}})}^{1} {(\frac{L_{1}}{L_{2}})}^{1} {(\frac{T_{1}}{T_{2}})}^{- 2}$

= $100 {(\frac{g m}{k g})}^{1} {(\frac{c m}{m})}^{1} {(\frac{\sec}{m i n})}^{- 2}$

= $100 {(\frac{g m}{10^{3} g m})}^{1} {(\frac{c m}{10^{2} c m})}^{1} {(\frac{\sec}{60 \sec})}^{- 2}$

n₂ = $\frac{3600}{10^{3}} = 3 .6$

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The unit of L/R is (where L = inductance and R = resistance)

sec

sec^–1

Volt

Ampere

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Explanation

$[L / R]$ is a time constant so its unit is Second.

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Which is different from others by units?

Phase difference

Mechanical equivalent

Loudness of sound

Poisson's ratio

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Explanation

Poission ratio is a unitless quantity.

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Length cannot be measured by

Fermi

Debye

Micron

Light year

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Explanation

Debye is the unit of electric dipole moment. Therefore length cannot be measured by debye.

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The value of Planck's constant is

$6 .63 \times 10^{- 34} J - \sec$

$6 .63 \times 10^{34} J / \sec$

$6 .63 \times 10^{- 34} k g - m^{2}$

$6 .63 \times 10^{34} k g / \sec$

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Explanation

$6 .63 \times 10^{- 34} J - \sec$

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A physical quantity is measured and its value is found to be nu where n = numerical value and u = unit. Then which of the following relations is true

$n \propto u^{2}$

$n \propto u$

$n \propto \sqrt{u}$

$n \propto \frac{1}{u}$

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Explanation

$P = n u ∴ n \propto \frac{1}{u}$

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Faraday is the unit of

Charge

emf

Mass

Energy

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Explanation

1 Faraday = 96500 coulomb.

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Candela is the unit of

Electric intensity

Luminous intensity

Sound intensity

None of these

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Explanation

The candela is a measure of luminous intensity.

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The unit of reactance is

Ohm

Volt

Mho

Newton

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Explanation

Reactance is measured in the unit of Ohm (Ω).

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