999+ Physics Questions Answers Explanation MCQ

Q:

The complete form of 'IC' in electronics is

A) Internal circuit	B) Independent circuit
C) Integrated circuit	D) Inbuilt circuit

Answer & Explanation Answer: C) Integrated circuit

Explanation:

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Q:

The attenuation in optical fibre is mainly due to

A) Scattering	B) Absorption
C) Both (a) and (b)	D) Neither absorption nor scattering

Answer & Explanation Answer: A) Scattering

Explanation:

The reason for transmitting data over optical fibers, is because the speed of data transmission through optical wires are equal to the speed of light. The intense speed of data transfer speed, has lead to the use of optical fibers. The optical fiber uses the technology of transferring light beams, from one end to the other end of optical cables. The attenuation in optical fiber is due to Scattering. The reason why scattering is caused, due to the folding, in the wire.

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is same as that of earth and radius is twice as that of earth is _________________.

A) g/4	B) g/2
C) 4g	D) 2g

Answer & Explanation Answer: A) g/4

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:

The absolute refractive index of air is

A) 1.03	B) 1.00003
C) 1.003	D) 1.0003

Answer & Explanation Answer: D) 1.0003

Explanation:

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Q:

An earthquake of magnitude _________________ on Richter scale has thousand times more destructive energy than an earthquake of magnitude 4.

A) 5	B) 7
C) 6	D) 8

Answer & Explanation Answer: C) 6

Explanation:

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Q:

The phenomenon of change in direction of light when it passes from one medium to another is called

A) Propagation	B) Reflection
C) Refraction	D) Dispersion

Answer & Explanation Answer: C) Refraction

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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

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