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

The ringing is not loud enough
The bell jar is too small
The glass of the bell jar absorbs the sound waves
There is no air or any other gas in the bell jar

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The surface of the liquid remains horizontal
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
None
The liquid surface falls down only at the center of the tank

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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