Physics Questions

Q:

when an atom loses an electron it becomes

A) neutron B) negative ion
C) positive ion D) none of the above
 
Answer & Explanation Answer: C) positive ion

Explanation:

If it loses an electron it becomes a positive ion

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1 2071
Q:

A circuit breaker is a

A) Switch B) Resistor
C) Fuse D) Resettable protective device
 
Answer & Explanation Answer: D) Resettable protective device

Explanation:

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload.

 

circuit_breaker_is_a1600689504.jpg image

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1 2041
Q:

An object having the capability to do work is said to possess

A) Inertia B) Force
C) Pressure D) Energy
 
Answer & Explanation Answer: D) Energy

Explanation:
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0 2040
Q:

Which determines the frequency of a sound wave?

A) Amplitude B) Speed
C) Source D) Medium
 
Answer & Explanation Answer: A) Amplitude

Explanation:

The frequency of a sound wave is determined by the amplitude of the wave. As amplitude of the wave is high the frequency of the wave will also be high.

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2 2038
Q:

The wavelike properties of electrons are useful in

A) Magnifying objects B) Lasers
C) Weather reports D) All of the above
 
Answer & Explanation Answer: A) Magnifying objects

Explanation:

The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.

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6 2035
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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5 2033
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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2 2031
Q:

The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.

A) 2 m/s B) 2 m
C) 2 m/sq.s D) 2 s
 
Answer & Explanation Answer: C) 2 m/sq.s

Explanation:
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0 2031