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Measurement MCQs for NEET — Physics Questions with Answers

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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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Which does not has the same unit as others

Watt-sec

Kilowatt-hour

J-sec

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Explanation

Joule-sec is the unit of angular momentum where as other units are of energy.

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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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