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Q:

A rocket is launched to travel vertically upward with a constant velocity of 20 m/s. After travelling for 35 seconds, the rocket develops a snag and its fuel supply is cut off. The rocket then travels like a free body. The height achieved by it is

A) 680 m B) 720 m
C) 800 m D) 700 m
 
Answer & Explanation Answer: B) 720 m

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Q:

Acceleration is

A) Inversely proportional to force B) Inversely proportional to mass
C) Directly proportional to mass D) Directly proportional to force
 
Answer & Explanation Answer: D) Directly proportional to force

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0 1017
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:

If the initial velocity of a car is 5 m/s, and the final velocity is 10 m/s in 5s, then the acceleration is ___.

A) 10 m/s2 B) 0.1 m/s2
C) 1 m/s2 D) 5 m/s2
 
Answer & Explanation Answer: C) 1 m/s2

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Q:

For what is Mohs scale used?

A) To measure brightness of a substance B) To measure viscosity of a liquid
C) To measure elasticity of a material D) To measure hardness of minerals
 
Answer & Explanation Answer: D) To measure hardness of minerals

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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:

What is the reason for formation of Mirage in desert?

A) Refraction of light B) Reflection of light
C) Total internal reflection of light D) Both Refraction and Total internal reflection of light
 
Answer & Explanation Answer: D) Both Refraction and Total internal reflection of light

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Q:

Calculate the work done by the force of gravity when a satellite moves in an orbit of radius 40,000 km around the earth.

A) 8,000 J B) 4,00,000 J
C) 0 J D) 4,000 J
 
Answer & Explanation Answer: C) 0 J

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