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NEET Practice Questions (MCQs) with Answers & Solutions

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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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The unit of Planck's constant is:

Joule

Joule/s

Joule/m

Joule-s

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Explanation

$E = h ν \Rightarrow h = \frac{E}{ν} = j o u l e - s$

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SI unit of permittivity is

$C^{2} m^{2} N^{- 1}$

$C^{- 1} m^{2} N^{- 2}$

$C^{2} m^{2} N^{2}$

$C^{2} m^{- 2} N^{- 1}$

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Explanation

$F = \frac{1}{4 π \in} \frac{q_{1} q_{2}}{r^{2}} \Rightarrow \in = \frac{1}{4 π} \frac{q_{1} q_{2}}{F r^{2}} = C^{2} m^{- 2} N^{- 1}$

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