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Q:

If a ball is thrown vertically upwards with a velocity of 40 m/s, then what will be the magnitude of its displacement after 6 s?

A) 80 m B) 40 m
C) 60 m D) 20 m
 
Answer & Explanation Answer: C) 60 m

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Q:

Diamond does not conduct electricity, because

A) It's structure is very compact B) It is of crystalline nature
C) There are only carbon atoms present in it D) No free electrons are present in it
 
Answer & Explanation Answer: D) No free electrons are present in it

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Q:

Consider a planet whose mass and radius are both twice the mass and radius of Earth. The acceleration due to gravity on the surface of the planet is 'n' times that on Earth. The value of n is:

 

A) 4 B) 1
C) 12 D) 2
 
Answer & Explanation Answer: C) 12

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Q:

Kinetic energy is equal to

A) 1/2 mv2 B) mgh
C) mv D) Ma
 
Answer & Explanation Answer: A) 1/2 mv2

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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is double that of earth and radius is same as that of earth is _________________.

A) 2g B) g
C) g/2 D) 4g
 
Answer & Explanation Answer: A) 2g

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Q:

The speed of the light is maximum in

A) Air B) Vacuum
C) Water D) Glass
 
Answer & Explanation Answer: B) Vacuum

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Q:

The theory behind stars twinkling is that

A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time B) The intensity of light emitted by them changes with time
C) The light from the star is scattered by the dust particles and air molecules in the earth's atmosphere D) The distance of the stars from the earth changes with time
 
Answer & Explanation Answer: A) The refractive index of the different layers of earth's atmosphere changes continuously, consequently the position of the star's image changes with time

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Q:

Astronauts inside spaceship feel ___ weight.

A) More B) Less
C) Zero D) Depends on G force
 
Answer & Explanation Answer: C) Zero

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