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School Physics Quiz : Pressure


Answer the following questions based on the change of state and latent pressure.

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Multiple choice

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1.

pressure - manometer
One arm of a glass U-tube is open to the atmosphere, whereas the other vertical arm is connected to a gas supply. The difference in levels of mercury (density = 13.6 g cm-3) between the vertical arms of the U-tube manometer is h = 2 cm. If the atmospheric pressure is 760 mm Hg and the gravitational acceleration is 9.8 m s-2, then the pressure of the gas is about

  2.666 × 104dynes cm-2

  1.040 × 106dynes cm-2

  1.016 × 107dynes cm-2

  1.061 × 104dynes cm-2

  Half-n-half Clue
 

2.

pressure - manometer
If the density of liquid A (carbon tetrachloride) is 1.6 g cm-3 and its height hA = 15.0 cm, then the density of oil B of height hB = 30 cm in the U-tube is about

  0.80 g cm-3

  1.25 g cm-3

  0.31 g cm-3

  3.20 g cm-3

  Half-n-half Clue
 

3.

1 Pascal = 1 _______ m-2

  Erg

  Dyne

  Joule

  Newton

  Half-n-half Clue
 

4.

The SI unit of pressure is

  Watt

  Newton

  Joule

  Pascal

  Half-n-half Clue
 

5.

What instrument is used for measuring atmospheric pressure?

  Hydrometer

  Barometer

  Hygrometer

  Sphygmomanometer

  Half-n-half Clue
 

6.

The average atmospheric pressure at sea level is 760 mm Hg. If the relative density of mercury is 13.6, then the air pressure can support _______ m of vertical length of a water column at sea level.

  10336

  101396

  10.336

  0.76

  Half-n-half Clue
 

7.

Which is the 'odd one out'?

  Pa

  bar

  N

  mm Hg

  Half-n-half Clue
 

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