Physics Questions

Q:

Solids have definite shapes.This is because

A) the forces of cohesion of the molecules within are very much less in them B) the forces of cohesion are very large
C) the forces of adhesion are large D) the forces of adhesion are less
 
Answer & Explanation Answer: B) the forces of cohesion are very large

Explanation:

Cohesion refers to attraction between molecules of the same kind while adhesion refers to attraction between different kinds of molecules

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Q:

In the electrical circuit of a house, the fuse acts as

A) a load B) a thermopile
C) a safety device D) a step down device
 
Answer & Explanation Answer: C) a safety device

Explanation:
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Q:

Electrical burns occur principally because of

A) Radiation pulses of the electricity B) The heat generated by the flow of electrical current through the body
C) The high energy of electrons D) All of the above
 
Answer & Explanation Answer: B) The heat generated by the flow of electrical current through the body

Explanation:

Electrical burns occur principally because of the heat generated by the flow of electrical current through the body.

 

Burns caused by electricity are divided into three types:

electrical burns,

arc burns, and

thermal contact burns.

 

Electrical burns can result when a person touches electrical wiring or equipment that is used or maintained improperly.

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Q:

Which best describes how air moves during convection?

A) cool air falls down B) warm air falls down
C) cool air is replaced by warm air D) air always falls down
 
Answer & Explanation Answer: A) cool air falls down

Explanation:

During convection, cool and dense air falls through the warmer and less dense air. The warm air having less mass is being displaced by the cooler which is much heavy. Convection always involves the air rising through the atmosphere.

 

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Q:

One light year is approximately equal to

A) 10^12 mts B) 10^16 mts
C) 10^11 mts D) 10^13 mts
 
Answer & Explanation Answer: B) 10^16 mts

Explanation:

Light year is the unit of to express astronomical distances, that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More precisely, one light-year is equal to 9,500,000,000,000 kilometers.

 

Approximately, 1 light year = 10^16 mts.

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Q:

Pick out the only vector quantity

A) pressure B) impulse
C) gravitational potential D) co-efficient of friction
 
Answer & Explanation Answer: B) impulse

Explanation:
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Q:

Siphon will fail to work if

A) The level of the liquid in the two vessels are at the same height B) The temperature of the liquids in the two vessels are the same
C) The densities of the liquid in the two vessels are equal D) Both its limbs are of unequal length
 
Answer & Explanation Answer: A) The level of the liquid in the two vessels are at the same height

Explanation:

Siphon is a tube bent to form two legs of unequal length by which a liquid can be transferred from a reservoir and then down to a lower level of it.

 

siphon_will_fail_to_work_if1556686678.jpg image

 

Siphon will fail to work if, the level of the liquid in the two vessels are at the same height.

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Q:

When two similar sources vibrate with slightly different frequencies , a regular rise and fall occurs in the loudness of tone. This phenomenon is known as 

A) doppler effect B) beats
C) resonance D) echo
 
Answer & Explanation Answer: B) beats

Explanation:

Beats means the periodic increase and decrease in loudness heard when two notes of nearly the same frequency are sounded simultaneously.

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