69
Q:

Pieces of camphor placed on water move about rapidly. This is because of

A) diffusion B) viscosity
C) surface tension D) capillarity

Answer:   C) surface tension



Explanation:

The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.

Subject: Physics
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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1 116
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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1 85
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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1 488
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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0 493
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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0 87
Q:

What is the upward force exerted by the water on the bottle containing it called?

 

A) Tension B) Buoyant Force
C) Thrust D) Pressure
 
Answer & Explanation Answer: B) Buoyant Force

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0 228
Q:

Energy possessed by an object of mass 10 kg when it is at a height of 8 m above the ground. Given g=9.8 ms-2

 

A) 784 J B) 588 J
C) 520 J D) 528 J
 
Answer & Explanation Answer: A) 784 J

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0 142
Q:

How much work is done in moving a charge of 4 C across two points having a potential difference of 12 V?

 

A) 48 J B) 3 J
C) 40 J D) 12 J
 
Answer & Explanation Answer: A) 48 J

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0 159