Physics Questions

Q:

Which liquid is the most viscous?

A) Water B) Diesel
C) Milk D) Oil
 
Answer & Explanation Answer: D) Oil

Explanation:

Here Oil is the most viscous liquid.

The liquid with the most intermolecular force is high viscous. viscosity is how smoothly a liquid flows and how hardly the liquid flows it is highly viscous.

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Q:

If a band is played on the moon the sound will

A) reverberate B) be heard by us faintly
C) be heard upto 10km from it D) not be heard at any distance at all from it
 
Answer & Explanation Answer: D) not be heard at any distance at all from it

Explanation:

As there is no atmosphere surrounding the moon, the sound from any band that is played there cannot travel outwards there is no material medium  surrounding it for its propagation.

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Q:

To produce deflection in a television picture tube:

A) an electric field is used B) a magnetic field is used
C) both electric and magnetic field are used D) none of the above
 
Answer & Explanation Answer: B) a magnetic field is used

Explanation:
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Q:

Find the acceleration (in m/s2) produced in a body of mass 2 kg when a force of 8 N is applied on it.

 

A) 4 B) 16
C) 8 D) 32
 
Answer & Explanation Answer: A) 4

Explanation:
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Q:

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A) increase B) decrease
C) remains the same D) first decrease and then increase
 
Answer & Explanation Answer: B) decrease

Explanation:

Let M and m grams be the mass of boat + rock in it. By law of floatation(M+m) grams of water will be displaced. This has a volume of (M+m)cc. That means the level of water in pool has risen up by (M+m)cc with the boat + rock when it is floating. If the rocks in the boat are thrown not into the pool but outside, the weight left is only M grams the weight of the boat. This will have displaced M cc of water only i.e less water than in the case of loaded boat. But if the rocks are put in the water in the pool and not outside, then the water in the pool will rise not only by M cc on account of empty boat but also by a volume of the stone put into it. This volume will be mdwhere m is the mass of rock and d density of rock.

Now md is  < m. Thus the total rise will be M+mdwhich is < M + m.

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Q:

____ is not a type of heat transfer.

 

A) Diffusion B) Reflection
C) Convection D) Radiation
 
Answer & Explanation Answer: B) Reflection

Explanation:
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Q:

Blotting paper absorbs ink due to

A) Capillary action phenomenon B) Diffusion of ink through the blotting
C) Siphon action D) Viscosity of ink
 
Answer & Explanation Answer: A) Capillary action phenomenon

Explanation:

Blotting paper absorbs ink by the process of capillary action. The capillary action is based on the property of surface tension of liquid.

 

All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.

 

Blotting paper has also been sold as a cosmetic to aid in the removal of skin oils and makeup.

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Q:

Pick out the only scalar quantity

A) power B) Electric field
C) magnetic momentum D) average velocity
 
Answer & Explanation Answer: A) power

Explanation:
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