Pressure exerted by Gases

Due to gas molecules bombarding the walls of the container, gases exert _____.

• stress

• power

• air force

• pressure

When a gas is heated and its temperature rises, the gas molecules move at a

• lower speed

• constant slow speed

• zero speed

• higher speed

The pressure “p” of a fixed mass of gas is directly proportional to the _____________.

• area of the gas

• temperature of the gas

• volume of the gas

• nature of the gas

Water is not used as a barometric liquid because

• it is difficult to have a barometer tube 11 m long.

• water vaporises under vacuum conditions.

• water sticks to the sides of the glass tube.

• all the above

The space above the mercury in a simple barometer is called ________.

• Toricellian vacuum

• Newton’s space

• Archimedes' vacuum

• Maxwell’s space

The height of the mercury column which a simple barometer can support at sea level is ____.

• 76 cm

• more than 76 cm

• less than 76 cm

• none of these

When ink from a fountain pen leaks at high altitudes, it means ___________.

• pressure of air is more outside than inside the ink pen.

• pressure of air is less outside than inside the ink pen.

• the density of ink increases at higher altitudes.

• the volume of ink decreases at higher altitudes.

The ------------- exerted by atmosphere per unit area on the surface of earth is called atmospheric pressure.

• pressure

• force

• mass

• height

The value of atmospheric pressure is found to be about

• 10,000 Pa.

• 100,000 Pa.

• 1 Pa.

• 1000 Pa.

The instrument which is used for measurement of air pressure is called _______________.

• barometer

• manometer

• speedometer

• millimeter