999+ Physics Questions Answers Explanation MCQ

Q:

Blood pressure is measured by _______.

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

Answer & Explanation Answer: B) Sphygmomanometer

Explanation:

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Q:

In an optical fibre the signal is transmitted

A) in a straight line path	B) In a curved path
C) due to total internal reflection	D) Due to refraction

Answer & Explanation Answer: D) Due to refraction

Explanation:

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Q:

Terminal velocity ________.

A) first increases before decreasing	B) is constant
C) first decreases before increasing	D) always keeps on increasing

Answer & Explanation Answer: B) is constant

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

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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

Explanation:

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Q:

When a compressed slinky is released it converts potential energy into

A) Heat energy	B) Mechanical energy
C) Chemical energy	D) Kinetic energy

Answer & Explanation Answer: D) Kinetic energy

Explanation:

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Q:

Which one of the following statements is not correct?

A) The response of the ear to sound of increasing intensity is approximately logarithmic.	B) The sensitivity of the human ear does not vary with the frequency of the sound.
C) When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.	D) Longitudinal waves can travel in all media-solids, liquids and gases.

Answer & Explanation Answer: B) The sensitivity of the human ear does not vary with the frequency of the sound.

Explanation:

The human ear can respond to minute pressure variations inthe air if they are in the audible frequency range, roughly 20 Hz -20 kHz. In fact, tests conducted show an increased sensitivity in the 3000 Hz range which is the optimal amplification frequency in the human ear. So, the sensitivity of the human ear varies with the frequency of the sound.

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Q:

The boiling point of liquids vary as

A) pressure varies	B) temperature varies
C) volume varies	D) density varies

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