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Physics MCQs for NEET — Practice Questions with Answers

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Hertz is the unit of

Frequency

Force

Electric charge

Magnetic flux

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Explanation

Hertz is the unit of frequency.

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One pico Farad is equal to

$10^{- 24} F$

$10^{- 18} F$

$10^{- 12} F$

$10^{- 6} F$

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Explanation

Pico prefix used for $10^{- 12}$ .

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In SI, Henry is the unit of

Self inductance

Mutual inductance

(1) and (2) both

None of the above

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Explanation

and (2) both

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The unit of $e . m . f .$ is

Joule

Joule-Coulomb

Volt–Coulomb

Joule/Coulomb

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Explanation

Unit of $e . m . f .$ = volt = joule/coulomb

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Unit of self inductance is [Only for droppers]

$\frac{N e w t o n - \sec o n d}{C o u l o m b \times A m p e r e}$

$\frac{J o u l e / C o u l o m b \times S e c o n d}{A m p e r e}$

$\frac{V o l t \times m e t r e}{C o u l o m b}$

$\frac{N e w t o n \times m e t r e}{A m p e r e}$

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Explanation

$V o l t a g e V = \frac{L i}{t} I n d u c \tan c e L = \frac{V t}{i} P u t t i n g u n i t s o f e a c h q u a n t i t y$

$\frac{J o u l e / C o u l o m b \times S e c o n d}{A m p e r e}$

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To determine Young's modulus of a wire, the formula is $Y = \frac{F}{A} \times \frac{L}{Δ L};$ where L = length, A = area of cross-section of the wire, $Δ L =$ change in length of the wire when stretched with a force F. The conversion factor to change it from CGS to MKS system is

0.1

0.01

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Explanation

$Y = \frac{F}{A} . \frac{L}{Δ L}$ = $\frac{d y n e}{c m^{2}} = \frac{10^{- 5} N}{10^{- 4} m^{2}} = 0 .1 N / m^{2}$

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Young's modulus of a material has the same units as

Pressure

Strain

Compressibility

Force

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Explanation

$Y = \frac{Stress}{Strain} = \frac{Force/Area}{Dimensionless} \Rightarrow Y \equiv Pressure$ .

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One yard in SI units is equal :

1.9144 metre

0.9144 metre

0.09144 kilometre

1.0936 kilometre

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Explanation

$1 y a r d = 36 i n c h e s = 36 \times 2 .54 c m = 0 .9144 m$ .

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Which of the following is smallest unit

Millimetre

Angstrom

Fermi

Metre

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Explanation

$1 fermi = 10^{-15} m e t r e$

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Which one of the following pairs of quantities and their units is a proper match

Electric field – $C o u l o m b / m$

Magnetic flux – $W e b e r$

Power – Farad

Capacitance – Henry

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Explanation

Magnetic flux – $W e b e r$

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