999+ Physics Questions Answers Explanation MCQ

Q:

A body of mass 3 kg accelerates from 10 m/s to 20 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

A) 6	B) 18
C) 12	D) 36

Answer & Explanation Answer: A) 6

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Q:

In a hydrogen atom, an electron moves in an orbit of radius $5.0 x 10^{- 11}$ m with a speed of $2.2 x 10^{6}$ m/s. What is the equivalent current? (Electronic charge = $1.6 x 10^{- 19}$ C)

A) 0.112 mA	B) 112 mA
C) 11.2 mA	D) 1.12 mA

Answer & Explanation Answer: D) 1.12 mA

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Q:

Which one of the following takes place during a nuclear fusion?

A) a heavy nucleus bombarded by neutrons breaks up	B) a heavy nucleus breaks up spontaneously
C) two light nuclei combine to form a heavy nucleus	D) a light nucleus breaks up spontaneously

Answer & Explanation Answer: C) two light nuclei combine to form a heavy nucleus

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Q:

A body in equilibrium _______.

A) can move with constant acceleration	B) is always at rest
C) can move with constant velocity	D) can move with variable acceleration

Answer & Explanation Answer: C) can move with constant velocity

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Q:

Blood pressure is measured by _______.

A) Barometer	B) Sphygmomanometer
C) Hydrometer	D) Thermometer

Answer & Explanation Answer: B) Sphygmomanometer

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Q:

Which one of the following is not a property of electromagnetic waves?

A) Electromagnetic waves do not show interference and diffraction.	B) Oscillating electric field and magnetic field are perpendicular to each other.
C) Electromagnetic waves are transverse waves	D) Electromagnetic waves do not require a medium to propagate.

Answer & Explanation Answer: A) Electromagnetic waves do not show interference and diffraction.

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Q:

Which of the following is Inexhaustible Natural Resources?

A) Air	B) Minerals
C) Forests	D) Coal

Answer & Explanation Answer: A) Air

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Q:

What is the fundamental unit of amount of a substance?

A) Mole	B) Candela
C) Kelvin	D) Meter

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