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Q:

Which of the following statements is true?

The velocity of sound is :

 

A) less in summer than in winter B) same in winter and summer
C) independent of seasons D) more in summer than in winter
 
Answer & Explanation Answer: D) more in summer than in winter

Explanation:
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Q:

Nuclear sizes are expressed in a unit named

A) Fermi B) Angstrom
C) Newton D) Tesla
 
Answer & Explanation Answer: A) Fermi

Explanation:

Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.

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Q:

Sound waves can not travel through a

 

A) copper wire placed in air B) silver slab placed in air
C) glass prism placed in water D) wooden hollow pipe placed in vacuum
 
Answer & Explanation Answer: D) wooden hollow pipe placed in vacuum

Explanation:

Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.

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Q:

The filament of a light bulb is made up of

 

A) Platinum B) Tantalum
C) Tungsten D) Antimony
 
Answer & Explanation Answer: C) Tungsten

Explanation:
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Q:

Calculate the power (in W) of an engine if it can perform 120 J of work in 3 seconds.

 

A) 360 B) 80
C) 180 D) 40
 
Answer & Explanation Answer: D) 40

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Q:

Echoes may be heard more than once due to successive or multiple

 

A) Rarefactions B) Reflections
C) Diffractions D) Refractions
 
Answer & Explanation Answer: B) Reflections

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Q:

Seismic waves are recorded by an instrument called the ________________.

 

A) seismograph B) odograph
C) isograph D) lithograph
 
Answer & Explanation Answer: A) seismograph

Explanation:
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Q:

If the velocity of a body is doubled its kinetic energy ________________.

 

A) is also doubled B) becomes half  
C) becomes 1/4 th   D) become 4 times  
 
Answer & Explanation Answer: D) become 4 times  

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