11
Q:

Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days 

A) the pores in the pot are closed B) rain water stops oozing out from the pores
C) the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air D) surface of the pot becomes damp

Answer:   C) the water that oozes out does not evaporate quickely because of the large percent age of moisture in the air



Explanation:

To evaporate the water that oozes out, heat is required. Part of this heat is taken from the water inside which therefore become cool. Therefore (C) is correct. Here evaporation is less, so cooling too is less.

Subject: Physics
Q:

If the velocity of a body is doubled its momentum ________________.

 

A) remains same   B) doubles  
C) becomes half   D) becomes 4 times  
 
Answer & Explanation Answer: B) doubles  

Explanation:
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2 3105
Q:

A body of mass 8 kg is moving with a velocity of 4 m/s, find its momentum.

 

A) 2 B) 64
C) 32 D) 4
 
Answer & Explanation Answer: C) 32

Explanation:
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0 3297
Q:

Ozone at the higher level of the atmosphere is a product of ______ acting on oxygen molecules.

 

 

A) IR radiation B) UV radiation
C) gamma rays D) x-rays
 
Answer & Explanation Answer: B) UV radiation

Explanation:
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1 5321
Q:

'Torr' is a unit of _______.

 

A) force   B) energy  
C) power   D) pressure
 
Answer & Explanation Answer: D) pressure

Explanation:
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6 4144
Q:

What is the velocity of sound in air?

 

A) 343 m/sec B) 110 m/sec
C) 220 m/sec D) 232 m/sec
 
Answer & Explanation Answer: A) 343 m/sec

Explanation:
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4 3811
Q:

The power of a lens is —2.5 D. The type of lens and its focal length are respectively:

 

A) Convex, -0.40 m B) Concave, -0.40 m
C) Concave, 0.40 m D) Convex, 0.40 m
 
Answer & Explanation Answer: B) Concave, -0.40 m

Explanation:
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0 3907
Q:

Which one of the following is the unit of force?

 

A) Pascal B) Watt
C) Joule D) Newton
 
Answer & Explanation Answer: D) Newton

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0 3351
Q:

Which of the following are Mechanical waves?

 

A) X rays B) Radio waves
C) Microwaves D) Sound waves
 
Answer & Explanation Answer: D) Sound waves

Explanation:
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4 4566