999+ Physics Questions Answers Explanation MCQ

Q:

If an object is placed at the center of curvature of a concave mirror, then the image formed will be

A) virtual and enlarged	B) virtual and diminished
C) real and of the same size	D) real and enlarged

Answer & Explanation Answer: C) real and of the same size

Explanation:

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Q:

Insulators have resistivity of the order of

A) 106 Ω m to 108 Ω m	B) 10-12 Ω m to 10-17 Ω m
C) 10-8 Ω m to 10-6 Ω m	D) 1012 Ω m to 1017 Ω m

Answer & Explanation Answer: D) 1012 Ω m to 1017 Ω m

Explanation:

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Q:

While releasing the arrow from a stretched bow, the PE of the bow is converted into?

A) chemical energy	B) kinetic energy
C) sound energy	D) heat energy

Answer & Explanation Answer: B) kinetic energy

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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:

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

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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

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Q:

When body is accelerated--

A) Its velocity never changes.	B) Its speed will always change.
C) Its direction always changes.	D) Its speed may or may not change.

Answer & Explanation Answer: D) Its speed may or may not change.

Explanation:

Uniform circular motion, that is constant speed along a circular path, is an example of a body experiencing acceleration resulting in velocity of a constant magnitude but the change of direction

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Q:

Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

A) -4.33 diopters	B) 12.33 diopters
C) -12.33 diopters	D) 4.33 diopters

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