SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is a vacuum?
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A space with only air in it
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A space with NO matter at all present
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A machine you use to do your chores
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None of the above
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Explanation:
Detailed explanation-1: -vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).
Detailed explanation-2: -Space is usually regarded as being completely empty. But this is not true. The vast gaps between the stars and planets are filled with huge amounts of thinly spread gas and dust. Even the emptiest parts of space contain at least a few hundred atoms or molecules per cubic metre.
Detailed explanation-3: -Free space usually refers to a perfect vacuum, devoid of all particles.
There is 1 question to complete.