Physics GK 09 - Pressure

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1.
Hydraulic Brakes work on which principle?
2.
What is the use of Venturimeter?
3.
When a barometer is taken down in a coal mine , which of the following happens with the Mercury level in the tube?
4.
Which among the following character of mercury makes it suitable to use in barometers instead of water?
5.
Which of these is in action in the process of a liquid rising in the syringe when the piston is pulled up?
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