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 Physics Questions

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Q:

To resolve an object in an electron microscope,

A) the wavelength of the electrons must be close to the diameter of the object B) the wavelength of the electrons must be greater than the diameter of the object.
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) the wavelength of the electrons must be close to the diameter of the object

Explanation:
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1 1969
Q:

Due to an acceleration of 1  m/s2, the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in  that period.

 

A) 125 B) 37.5
C) 62.5 D) 75
 
Answer & Explanation Answer: B) 37.5

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8 1962
Q:

Glass is made from the mixture of

A) Sand and silicates B) Salt and Sand
C) Salt and silicates D) None of the above
 
Answer & Explanation Answer: A) Sand and silicates

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5 1949
Q:

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

A) newton second B) steradian
C) pascal D) joule
 
Answer & Explanation Answer: C) pascal

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1 1949
Q:

Negative acceleration is in the opposite direction of:

A) force B) distance
C) velocity D) momentum
 
Answer & Explanation Answer: C) velocity

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5 1946
Q:

Heat energy is transferred by conduction whenever molecules

A) collide each other B) means of photons
C) particles replaces there places D) All of the above
 
Answer & Explanation Answer: A) collide each other

Explanation:

Heat energy can be transferred by three major methods. They are 

 

1. Conduction,

2. Convection and

3. Radiation.

 

Conduction is the movement of heat through a substance by the collision of molecules

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

Radiation is the transfer of energy by means of photons in electromagnetic waves governed by the same laws. It occurs through a vacuum or any transparent medium.

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1 1941
Q:

Exerts a force on anything that has an electric charge

A) Electric field B) Electrostatic force
C) Inductive field D) All of the above
 
Answer & Explanation Answer: A) Electric field

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4 1939
Q:

Which vitamin is also called as H vitamin?

A) Vitamin B7 B) Vitamin B12
C) Vitamin B3 D) Vitamin B5
 
Answer & Explanation Answer: A) Vitamin B7

Explanation:

Biotin is a water-soluble B vitamin, also called vitamin B7 and formerly known as vitamin H or coenzyme R.

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2 1933