999+ Physics Questions Answers Explanation MCQ

Q:

For a body moving with uniform acceleration its final velocity equals _________________.

A) average velocity - initial velocity	B) 2 x average velocity - initial velocity
C) 2 x average velocity + initial velocity	D) average velocity + initial velocity

Answer & Explanation Answer: B) 2 x average velocity - initial velocity

Explanation:

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Q:

Heat flows as a result of difference of _____.

A) Temperature	B) Density
C) mass	D) Volume

Answer & Explanation Answer: A) Temperature

Explanation:

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Q:

In a _________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation

A) longitudinal	B) rolling
C) transverse	D) field

Answer & Explanation Answer: C) transverse

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Q:

In the gamma decay of a nucleus

A) the mass number of the nucleus changes whereas its atomic number does not change	B) the mass number of the nucleus does not change whereas its atomic number changes
C) both the mass number and the atomic number of the nucleus change	D) neither the mass number nor the atomic number of the nucleus changes

Answer & Explanation Answer: D) neither the mass number nor the atomic number of the nucleus changes

Explanation:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)

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Q:

The antiparticle of an electron is

A) Positron	B) Proton
C) Alpha particles	D) Beta particles

Answer & Explanation Answer: A) Positron

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Q:

The shortest distance measured from the initial to the final position of an object is known as the _________________.

A) motion	B) direction
C) velocity	D) displacement

Answer & Explanation Answer: D) displacement

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Q:

What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

A) 50	B) 12
C) 24	D) 36

Answer & Explanation Answer: B) 12

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Q:

A person does some work of 1,000 J in 2 s. His power will be ......

A) 1000W	B) 25W
C) 500W	D) 50W

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