9
Q:

Why does'nt the hydrogen atom emit X-rays?

A) It is very small in size B) It has only one electron
C) Its energy levels are very close to each other D) it is highly electropositive

Answer:   C) Its energy levels are very close to each other



Explanation:

For an atom to emit X-rays it should have difference in energy levels

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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1 138
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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0 147
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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1 765
Q:

'Torr' is a unit of _______.

 

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

Explanation:
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3 573
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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1 700
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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0 833
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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0 478
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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2 749