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Q:

A cyclist leans inwards when he is negotiating a curve so that

A) he may increase his speed B) his weight may be reduced
C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion. D) no frictional force may be produced between the wheels and the axle
 
Answer & Explanation Answer: C) necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

Explanation:

No circular or curved motion is possible without providing the necessary centripetal force. (C) provides this and so is the answer. 

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Q:

How many laws of physics are there?

A) 5 B) 4
C) 3 D) 2
 
Answer & Explanation Answer: C) 3

Explanation:

Physics has 5 laws. But the 3 laws of Newton has been clubbed together under one Law. Therefore there are 3 Newtons laws of Physics. They are ::

 

1. Newtons Laws of Motion

    a. First Law of Motion

    b. Second Law of Motion

    C. Third Law of Motion

 

2. Newtons Law of Cooling

 

3. Newtons Law of Gravitation.

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Q:

An atom bomb based upon the principal of ________

A) Nuclear fission B) Nuclear fussion
C) Controlled chain reaction D) None of these
 
Answer & Explanation Answer: A) Nuclear fission

Explanation:
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Q:

When a ray of light is  refracted by a prism such that the angle of deviation is minimum then

A) the angle of emergence is equal to the angle of incidence B) the angle of emergence is greater than the angle of incidence
C) the angle of emergence is smaller than the angle of incidence D) the sum of the angle of incidence and the angle of emergence is equal to 90 degrees
 
Answer & Explanation Answer: A) the angle of emergence is equal to the angle of incidence

Explanation:
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Q:

Speed of sound is maximum in which among the following?

A) Gases B) Vaccum
C) Liquids D) Solids
 
Answer & Explanation Answer: D) Solids

Explanation:

We know that, in solids all the particles are packed together and hence sound can travel from one to one very fast.

 

Hence, speed of sound is maximum in solids and decreses from solids to liquids and liquids to gases. Sound can't travel through vaccum.

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Q:

Rate of doing work is called

A) Capacity B) Energy
C) Power D) Current
 
Answer & Explanation Answer: C) Power

Explanation:

The Rate of doing work or rate of transfer of energy is called Power.

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Q:

Which is a common first indicator of an approaching thunderstorm?

A) too hot B) heavy wind
C) a buildup of dark clouds D) lightning
 
Answer & Explanation Answer: C) a buildup of dark clouds

Explanation:

The first indicator of an approaching thunderstorm is a buildup of dark clouds.

A thunderstorm is a storm with lightning and thunder; it is usually produced by heavy rain, gusty wind, and the cumulonimbus cloud. The thunderstorm is made up of moisture, unstable air and lift.

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Q:

Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

A) rough white B) rough black
C) shining white D) shining black
 
Answer & Explanation Answer: B) rough black

Explanation:

Black surfaces are good emitters of heat. If the black surface is rough too, the emitting will be better. Shinning surfaces reflect black radiation . So if the black surface is also shining the effectiveness of emitting heat is lessened.

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