Sawaal
38
Q:

The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because  

A) the ringing is not loud enough B) the glass of the bell jar absorbs the sound waves
C) the bell jar is too small D) there is no air or any other gas in the bell jar

Answer:   D) there is no air or any other gas in the bell jar



Explanation:

As there is no medium inside the bell jar, sound cannot travel

Subject: Physics
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What is the standard room temperature in Kelvin?

 

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An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

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1 watt is equal to 1 ____________

 

A) J s-1   B) J s
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A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

 

A)  25 B)  37.5
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Answer & Explanation Answer: D)  75

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