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When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to
Give reason for the following:
Water does not run out of a dropper unless its rubber bulb is pressed.
What is the purpose of a barometer?
How will you show that there is vacuum above the surface of mercury in a barometer? What name is given to this vacuum?
How is the barometric height of a simple barometer affected if Its tube is pushed down into the trough of mercury?
How is the barometric height of a simple barometer affected if Its tube is slightly tilted from vertical?
The radius of the press plunger and pump plunger are in ratio of 50 : 4. If an effort of 20 kgf acts on the pump plunger, calculate the maximum effort which the press plunger can over come.
Figure shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?
Briefly explain the concept of variation of atmospheric pressure.
The increase in internal energy of 1 kg of water at 100°c when it is converted into steam at the same temperature and at 1 atmospheric pressure will be ______.
(density of steam is 0.6 kg m-3, latent heat of vaporisation of water = 2.25 × 106 J kg-1).
