Physics Questions

Q:

A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be____.

A) 50J B) 30J
C) 20J D) 40J
 
Answer & Explanation Answer: A) 50J

Explanation:
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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 resistance (in ohm) of an electrical component if a current of 0.1 A passes through it on application of 5 V of potential difference across it?

A) 0.5 B) 100
C) 50 D) 1
 
Answer & Explanation Answer: C) 50

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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

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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:

Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

A) of variable refractive index B) made up of slabs of different refractive indices
C) homogeneous and transparent D) inhomogeneous and transparent
 
Answer & Explanation Answer: C) homogeneous and transparent

Explanation:

In vacuum and in homogeneous, transparent media, such as air, water, and glass, light moves in a straight line. When light encounters a boundary between two different transparent media, some light is reflected and some moves from the first into the second medium.

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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:

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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