8th Grade > Physics
FORCE AND PRESSURE MCQs
Total Questions : 56
| Page 6 of 6 pages
Answer: Option C. ->
Gravitational force
:
C
Water droplets in clouds which eventually form rain have mass. Therefore, they are pulled towards the Earth by the gravitational force of Earth.
:
C
Water droplets in clouds which eventually form rain have mass. Therefore, they are pulled towards the Earth by the gravitational force of Earth.
Answer: Option D. ->
1 Pa
:
D
:
D
Given:
Force on the body F=5 N
Surface area of the body A=5 m2
Now, pressure applied on the body P=FA
P=5 N5 m2=1 Nm−2=1 Pa
Pressure applied on the body =1 Pa
Answer: Option C. ->
A sharp knife has a smaller contact surface area and hence applies more pressure.
:
C
:
C
A sharp knife has a lesser contact surface area than a blunt one. Lesser the surface area, greater will be the pressure. So, a sharp knife applies a greater pressure when it is used for cutting. This is why a sharp knife cuts better than a blunt one.
Answer: Option B. ->
atmospheric pressure
:
B
Atmospheric pressure is defined as the pressure exerted by the weight of the atmosphere. A barometer can be used to measure atmospheric pressure.
:
B
Atmospheric pressure is defined as the pressure exerted by the weight of the atmosphere. A barometer can be used to measure atmospheric pressure.
Answer: Option C. ->
height of the liquid column
:
C
The pressure exerted by a liquid depends on:
It doesn't depend on area or shape of the liquid surface; nor on volume of the liquid.
:
C
The pressure exerted by a liquid depends on:
- density of the liquid
- acceleration due to gravity
- height of the liquid column
It doesn't depend on area or shape of the liquid surface; nor on volume of the liquid.
Answer: Option B. ->
Barometer
:
B
Barometers are instruments used to measure atmospheric pressure. A barometer is used by meteorologists to forecast short-term changes in the weather. If the atmospheric pressure falls, storms and rain can be expected.
:
B
Barometers are instruments used to measure atmospheric pressure. A barometer is used by meteorologists to forecast short-term changes in the weather. If the atmospheric pressure falls, storms and rain can be expected.
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