Physics Questions

Q:

Which of the following has the lowest frequency?

A) Visible light B) Gamma rays
C) X­-rays D) Ultra violet rays
 
Answer & Explanation Answer: A) Visible light

Explanation:
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Q:

The term photon refers to

A) light ray B) sub atomic particle
C) radiation D) None of the above
 
Answer & Explanation Answer: B) sub atomic particle

Explanation:

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force. The photon has zero rest mass and always moves at the speed of light within a vacuum.

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Q:

What is the other name of Galileo's law of falling bodies?

A) Law of motion B) Newton's first law
C) Newton's second law D) Newton's third law
 
Answer & Explanation Answer: B) Newton's first law

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Q:

Rate of change of displacement is known as ............

A) Acceleration B) Velocity
C) Speed D) Distance
 
Answer & Explanation Answer: B) Velocity

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Q:

Which compressor is usually used in AC?

A) Centrifugal B) Rotary
C) Reciprocating D) Axial
 
Answer & Explanation Answer: C) Reciprocating

Explanation:

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. The capacity of the air conditioning depends entirely on the capacity of the compressor. The reciprocating compressor is usually used in AC.

Which_compressor_is_usually_used_in_AC1559283550.jpg image

The reciprocating compressor have piston and cylinder arrangement like the automotive engine. The reciprocating motion of the piston due to external power compresses the refrigerant inside the cylinder.

There are three types of reciprocating compressors:

hermetically sealed,

semi-hermetically sealed and

open type.

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Q:

What is the unit of the physical quantity "Jerk"?

A) meter second B) meter per second cube
C) meter per second square D) meter per second
 
Answer & Explanation Answer: B) meter per second cube

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Q:

Bending of light rays in denser medium is termed as:

A) Reflection B) Dispersion
C) Refraction D) Deflection
 
Answer & Explanation Answer: C) Refraction

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Q:

_______ optical data storage is a technology where data is stored in multiple layers in the optical disc.

A) 3D B) 30D
C) 300D D) 3000D
 
Answer & Explanation Answer: A) 3D

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