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 Physics Questions

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Q:

Conservation of energy refers to the fact that

A) if you conserve energy you will not be as tired B) energy cannot be created or destroyed but can be converted from one form to another
C) no chemical reaction is 100 percent efficient D) the entropy of the universe is always increasing
 
Answer & Explanation Answer: B) energy cannot be created or destroyed but can be converted from one form to another

Explanation:

"Conservation of energy" refers to the fact that energy cannot be created or destroyed but can be converted from one form to another.

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Q:

When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?

A) 5.33 N B) 4.33 N
C) 6.33 N D) 3.33 N
 
Answer & Explanation Answer: A) 5.33 N

Explanation:
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Q:

In human relations, the irritation threshold is the

A) length of time an annoying behavior continues B) action that causes an annoyance
C) frequency of the annoying behavior D) point at which a person notices something and becomes annoyed
 
Answer & Explanation Answer: D) point at which a person notices something and becomes annoyed

Explanation:
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Q:

The light of distant stars is affected by

A) Interstellar Dust B) The Earth's Atmosphere
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:
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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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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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Q:

Negative acceleration is in the opposite direction of:

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

Explanation:
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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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