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Physics MCQs for NEET — Practice Questions with Answers

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Unit of surface tension is

$N m^{- 1}$

$N m^{- 2}$

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

$N m^{- 3}$

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Explanation

$T = \frac{F}{l} = N m^{- 1}$

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Which of the following system of units is not based on units of mass, length and time alone

MKS

FPS

CGS

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Explanation

Because in S.I. system there are seven fundamental quantities.

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The unit of the coefficient of viscosity in S.I. system is

$m / k g - s$

$m - s / k g^{2}$

$k g / m - s^{2}$

$k g / m - s$

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Explanation

$F = 6 πηav η = \frac{F}{6 πηav} = \frac{kg - m / s^{2}}{m \times m / s} = kg / m - \sec$

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The unit of Young’s modulus is

$N m^{2}$

$N m^{- 2}$

$N m^{- 1}$

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Explanation

$N m^{- 2}$

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One femtometer is equivalent to

$10^{15} m$

$10^{- 15} m$

$10^{- 12} m$

$10^{12} m$

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Explanation

$10^{- 15} m$

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How many wavelength of $K r^{86}$ are there in one metre

1553164.13

1650763.73

652189.63

2348123.73

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Explanation

According to the definition.

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Which of the following pairs is wrong

Pressure-Baromter

Relative density-Pyrometer

Temperature-Thermometer

Earthquake-Seismograph

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Explanation

Pyrometer is used for measurement of temperature.

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Select the pair whose dimensions are same

Pressure and stress

Stress and strain

Pressure and force

Power and force

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Explanation

Pressure $= \frac{Force}{Area} = M L^{- 1} T^{- 2}$

Stress $= \frac{Restoring force}{Area} = M L^{- 1} T^{- 2}$

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Dimensional formula $M L^{- 1} T^{- 2}$ does not represent the physical quantity

Young's modulus of elasticity

Stress

Strain

Pressure

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Explanation

Strain $= \frac{Δ L}{L} \Rightarrow$ dimensionless quantity

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Dimensional formula $M L^{2} T^{- 3}$ represents

Force

Power

Energy

Work

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Explanation

Power $= \frac{Work}{Time} = \frac{M L^{2} T^{- 2}}{T} = M L^{2} T^{- 3}$

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