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 Physics Questions

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Q:

An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

A) First law B) Second law
C) Third law D) Fourth law
 
Answer & Explanation Answer: A) First law

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Q:

Which of the following is not true about X­rays?

A) have low penetrating power B) travel with the speed of light
C) Can be reflected or refracted D) can affect photographic plates
 
Answer & Explanation Answer: A) have low penetrating power

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Q:

If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

A) Concave B) Convex
C) Cylindrical D) Plane
 
Answer & Explanation Answer: A) Concave

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Q:

Find arc elasticity of demand, if quantity demanded falls from 1000 to 950 when price of the item is increased from Rs. 240 to Rs. 280?

A) 0.33 B) 0.3
C) -0.3 D) -0.33
 
Answer & Explanation Answer: D) -0.33

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Q:

Current in a conductor can be increased by

A) increasing the voltage across it. B) reducing its resistance.
C) both A and B D) none of the above
 
Answer & Explanation Answer: C) both A and B

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Q:

The power of an earthquake is expressed in terms of a magnitude on a scale called __________ scale.

A) Schmitt B) Hutton
C) Werner D) Richter  
 
Answer & Explanation Answer: D) Richter  

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Q:

Supercooling is cooling of liquid _____.

A) below melting point B) below freezing point
C) at melting point D) above melting point
 
Answer & Explanation Answer: B) below freezing point

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Q:

Steel is more elastic than Rubber. True or False?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Elasticity is measured as ratio of stress to strain. For a given amount of stress, the strain produced in the steel is comparatively smaller than the strain produced in the rubber.


 


Therefore, with the help of Young's modulus, it can be concluded that steel has greater elasticity than rubber.

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