4
Q:

Hot water is poured simultaneously in four metallic tumblers painted outside with different points. 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:   B) rough black



Explanation:

Black  surfaces are good emitters of heat ( They are also good absorbers of heat). If the black surface is rough too, the emitting will be better. So (b) is the correct answer. Shining surfaces reflect back radiation. So if the black surface is also shining the effectiveness of emitting heat is lessened.

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

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0 57
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

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0 41
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 30
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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1 183
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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2 136
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 1161
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 1044
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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