GRADE 8-REVISION-2021(FORCE & PRESSURE)

Army tank tracks are useful for travelling through the mud because..

• they decrease the force the vehicle exerts on the ground
• they increase the force the vehicle exerts on the ground
• they decrease the pressure the vehicle exerts on the ground
• they increase the pressure the vehicle exerts on the ground

A camel can walk in deserts more easily as compared to horse donkey and others because its

• Feet are smaller

• Weight is lesser

• Feet are broader

• Heavier body

Watch the green man. Which force(s) are acting in this situation?

• Frictional Force only.

• Gravitational Force only.

• Muscular Force only.

• Muscular and Gravitational Force.

You and your friend are playing tug of war. Your friend pulls with a force of 55 N to the right. You pull with a force of 65 N to the left. What is the net force on the rope?

• 20 N left

• 20 N right

• 10 N left

• 10 N right

What is the unit of measurement for pressure?

• pascal
• grams
• milliters
• meters

Where is pressure the greatest on the dam?

• D
• C
• B
• A

A force F acts on 4 different objects, having areas given below. In which case, the pressure exerted will be maximum?

• 20m²

• 50m²

• 10m²

• 100m²

The pressure inside the syringe will decrease if we move the plunger in:

• Direction A

• Direction B

• We don't have to move the plunger as the pressure will change on its own.

• None of the above answers.

What is the value of atmospheric pressure at sea level ?

• 76 mm column of mercury

• 76 cm column of mercury

• 760 mm column of mercury

• Both B) and C)

Two boys A and B are applying force on a block. If the block moves towards the boy A, which one of the following statements is correct?

• Magnitude of force applied by A is greater than that of B.

• Magnitude of force applied by A is smaller than that of B.

• Net force on the block is towards B.

• Magnitude of force applied by A is equal to that of B.