Consequences of Atmospheric Pressure

Q. Name the instrument which is used to measure atmospheric pressure.

1. Barometer
2. Thermometer
3. Manometer
4. Speedometer

Q. A thin square plate of side $4m$ is placed horizontally $2m$ below the surface of water. Calculate the thrust on one of the surface of the plate.
(Given: Atmospheric pressure, $P_{atm}=1.013\times {10}^{5}N/m^2$
Density of water, ${\rho }_w$ = $1000kg/m^3$,
Acceleration due to gravity, $\left(g\right)=9.8m{s}^{-1}$)

1. $19.344\times {10}^{5}N$

2. $19.344\times {10}^{3}N$

3. $17.344\times {10}^{5}N$

4. $21.344\times {10}^{5}N$

Q.

The reason we are not crushed under the weight of air is that the pressure inside our body is equal to the atmospheric pressure.

1. True

2. False

Q. A column of air extending up to height of the atmosphere exists on an area of $100c{m}^2$ exists above our head. Why don't we get crushed?

1. The pressure inside his body is equal to the atmospheric pressure.
2. The pressure inside his body is higher than the atmospheric pressure.
3. His skin is not sensitive enough to feel it.
4. The pressure inside his body is lower than the atmospheric pressure.

Q. We are not crushed under the weight of air, as the pressure inside our body is to the atmospheric pressure.

1. greater
2. lesser
3. equal

Q. A drinking straw works on the pressure exerted by the atmosphere on the liquid which the straw is put into.

1. False
2. True

Q. A rubber sucker sticks to a surface due to the high air pressure acting on it from the surroundings.

1. False
2. True

Q. When the temperature of air over a region increases, the atmospheric pressure .

1. increases
2. decreases
3. remains same.

Q.

Siphoning is due to the difference in weight of the water columns of the "U" shaped tube.

1. True

2. False

Q.

How is water drawn up from a well by a water pump ?