5
Q:

Lightning is produced when 

A) Similar charges of electricity rush towards each other and then get repelled B) clouds strike against impurities in air and the friction burns up these impurities
C) strong opposite charges in different clouds break down the resistance offered by the intervening air D) water vapour produces electricity in the clouds

Answer:   C) strong opposite charges in different clouds break down the resistance offered by the intervening air



Explanation:

When the resistance of the air between breaks down the current flows from the positive cloud to the negative cloud in a flash which we call lightning . The difference of potential involves is very high.

Subject: Physics
Q:

0 deg K is equivalent to

A) 273 deg C B) -273 deg C
C) 0 deg C D) 100 deg C
 
Answer & Explanation Answer: B) -273 deg C

Explanation:
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0 100
Q:

The component used for tuning a radio is basically a variable ___.

A) Resistor B) Condenser
C) Inductor D) Transformer
 
Answer & Explanation Answer: B) Condenser

Explanation:
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0 76
Q:

The Beaufort scale is used to measure

A) Atmospheric pressure B) Altitudes of mountains
C) Wind velocity D) Intensity of earthquakes
 
Answer & Explanation Answer: C) Wind velocity

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0 92
Q:

What is the name of the phenomena (driven by the scattering of light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

 

A) Brillouin scattering   B) Circle of confusion  
C) Alpenglow   D) Barrel distortion  
 
Answer & Explanation Answer: C) Alpenglow  

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1 202
Q:

What is the name of the phenomena in physics and astronomy which involves the splitting of a spectral line into two or morecomponents of slightly different frequency when the light source is placed in a magnetic field?

 

A) Lumen Effect   B) Alpenglow Effect  
C) Zeeman Effect   D) Raman Effect  
 
Answer & Explanation Answer: C) Zeeman Effect  

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2 149
Q:

The product of mass and velocity is called:

 

A) Potential energy B) Momentum
C) Force D) Kinetic energy
 
Answer & Explanation Answer: B) Momentum

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1 1362
Q:

Complete the following.
1 kwh = ..........?

 

A) 36 × 10-6 J B) 3.6 × 10-6 J
C) 3.6 × 106 J D) 36 × 106 J
 
Answer & Explanation Answer: C) 3.6 × 106 J

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0 1467
Q:

A body is falling from a height of 200 m. After it has fallen 100 m, the body will possess:

 

A) less kinetic energy and more potential energy. B) Zero potential energy and half Kinetic energy
C) more kinetic energy and less potential energy. D) half potential energy and half kinetic energy.
 
Answer & Explanation Answer: D) half potential energy and half kinetic energy.

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1 186