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NEET Practice Questions (MCQs) with Answers & Solutions

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The unit of specific resistance is

$O h m / c m^{2}$

$O h m / c m$

$O h m - c m$

${(O h m - c m)}^{- 1}$

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Explanation

$R = ρ \frac{L}{A} \Rightarrow ρ = \frac{R A}{L} = o h m \times c m$

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The binding energy of a nucleon in a nucleus is of the order of a few

Ergs

MeV

Volts

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Explanation

The binding energy of a nucleon is of the order of MeV.

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$Par - \sec$ is a unit of :

Distance

Velocity

Time

Angle

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Explanation

It is the astronomical unit of distance.

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If u₁ and u₂ are the units selected in two systems of measurement and n₁ and n₂ their numerical values, then

$n_{1} u_{1} = n_{2} u_{2}$

$n_{1} u_{1} + n_{2} u_{2} = 0$

$n_{1} n_{2} = u_{1} u_{2}$

$(n_{1} + u_{1}) = (n_{2} + u_{2})$

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Explanation

Physical quantity (p) = Numerical value (n) × Unit (u). If physical quantity remains constant then n $\propto$ 1/u

$∴$ n₁u₁ = n₂u₂ .

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1 eV is

Same as one joule

$1 .6 \times 10^{- 19} J$

1 V

$1 .6 \times 10^{- 19} C$

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Explanation

$1 e V = 1 .6 \times 10^{- 19} c o u l o m b \times 1 v o l t = 1 .6 \times 10^{- 19} J$ .

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$1 k W h =$

$1000 W$

$36 \times 10^{5} J$

$1000 J$

$3600 J$

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Explanation

$1 k W h = 1 \times 10^{3} \times 3600 W \times \sec = 36 \times 10^{5} J$

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Universal time is based on :

Rotation of the earth on its axis

Earth's orbital motion around the Sun

Vibrations of cesium atom

Oscillations of quartz crystal

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Explanation

Universal Time is a standard time based on Earth's rotation.

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Unit of moment of inertia in MKS system

$k g \times c m^{2}$

$k g / c m^{2}$

$k g \times m^{2}$

$J o u l e \times m$

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Explanation

As I $= M R^{2} = k g - m^{2}$

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Unit of stress is

$N / m$

$N - m$

$N / m^{2}$

$N - m^{2}$

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Explanation

$Stress = \frac{Force}{Area}$ = $\frac{N}{m^{2}}$

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Unit of magnetic moment is

$A m p e r e - m e t r e^{2}$

$A m p e r e - m e t r e$

$W e b e r - m e t r e^{2}$

$W e b e r / m e t r e$

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Explanation

M = Pole strength × length = $a m p - m e t r e \times m e t r e = a m p - m e t r e^{2}$

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