999+ Physics Questions Answers Explanation MCQ

Q:

The frequency of direct current is _____________

A) Zero	B) 50 HZ
C) 60 HZ	D) 100 HZ

Answer & Explanation Answer: A) Zero

Explanation:

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Q:

Choose the most appropriate answer:In which atmospheric layer are the communication satellites located?

A) Stratosphere	B) Ionosphere
C) Troposphere	D) Mesosphere

Answer & Explanation Answer: B) Ionosphere

Explanation:

The communication satellites are located in Ionosphere.

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Q:

The ratio of change in velocity of a body to the total time taken by it is its __________________.

A) acceleration	B) displacement
C) force	D) momentum

Answer & Explanation Answer: A) acceleration

Explanation:

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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

Explanation:

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Q:

What is the unit of the physical quantity, Electrical conductance?

A) lux	B) ohm
C) farad	D) siemens

Answer & Explanation Answer: D) siemens

Explanation:

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Q:

What does the slope of a velocity time graph represent?

A) Acceleration	B) Distance
C) Speed	D) Momentum

Answer & Explanation Answer: A) Acceleration

Explanation:

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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:

Sextant is an instrument used in which of the following ?

A) Gynaecology	B) Navigation
C) Birth control	D) Medical treatment

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