Force and Pressure (Class 8)

Pressure is

• Force/ contact area

• contact area/ Force

• thrust x contact area

• none of these

If we apply 800 N of force on an area of 0.5 metres squared, what is the total pressure applied?

• 800 Pa

• 1600 Pa

• 2400 Pa

• 3200 Pa

A pressure of 5000 Pa acts on a surface. If the force applied is 1000 N, what is the area on which the pressure acts?

• 1 metre squared

• 0.5 metre squared

• 0.2 metre squared

• 0.1 metre squared

If we wish to increase the pressure exerted by a knife, which of the following steps can we take?

• Change colour of the Knife

• Make the knife heavier

• Make the knife blunter

• None of the above

As altitude increases, the pressure:

• Increases

• Decreases

• Stays Same

Identify barometer.

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Why do astronauts wear special suits in space?

• To prevent air pressure from crushing them

• To reduce the air pressure within the suit

• To increase surface area of their body

• To prevent depressurization of their body

What is name of the mechanism involved in a drinking straw?

• Pressure Mechanism

• Pulling Mechanism

• Suction Mechanism

• Sucking Mechanism

When a rubber sucker is pressed against a surface, why is it difficult to remove?

• Because of the High pressure within and the Low pressure outside the sucker.

• Because of the Low pressure within and the High pressure outside the sucker.

• Due to the equalization of the pressure inside and outside the sucker.

• None of these

Which of the following affects the pressure exerted by liquids at a given depth?

• Colour of the Liquid

• Temperature of the Liquid

• Density of the liquid

• None of the above