O level Physics Pressure

One end of the manometer is connected to a pump while the other is open to the atmosphere. Which length is used when calculating the difference between pressure of the air in the pump and the atmospheric pressure?

• A

• B

• C

• D

A rectangular box of dimensions 4.0m x 2.0m x 3.0m weighs 50 N. What is the minimum pressure it exerts on the surface it rests on?

• 2.1 Pa

• 4.2 Pa

• 6.3 Pa

• 8.3 Pa

When a barometer is taken up in a hot air balloon, the mercury height

• increases as atmospheric pressure increases

• increases as atmospheric pressure decreases

• decreases as atmospheric pressure increases

• decreases as atmospheric pressure decreases

A column of dry air is trapped by a pellet of mercury in a capillary tube. The capillary tube is held in different positions as shown in the diagram. Compare the air pressures P₁, P₂ and P₃

• P₁ > P₂ > P₃

• P₃ > P₂ > P₁

• P₁ > P₃ > P₂

• P₁ = P₂ = P₃

The nail is being knocked into a piece of wood with a force of 60 N. What is the pressure on the wood?

• 30 x 10 Pa

• 30 x 10² Pa

• 30 x 10³ Pa

• 30 x 10⁶ Pa

The diagram shows a hydraulic press being balanced by a 150 N force and a 1500 kg mass. The area of the smaller piston is 10cm². What is the value of A?

• 1.0cm²

• 10cm²

• 100cm²

• 1000cm²

If the atmospheric pressure is 760 mm Hg, what is the pressure of the trapped gas?

• 80 mm Hg

• 150 mm Hg

• 680 mm Hg

• 910 mm Hg

Which correctly compares the force and the pressure that the two blocks exert on earth?

• Force: same

• Force: different

• Pressure: same

• Pressure: different

The gravitational field strength g is 10 N/kg. Which block exerts the greatest pressure on the surface below it?

• A

• B

• C

• D

When this cup is inverted, the cardboard remains in place and water does not flow out. Which explains why this happens?

• The atmospheric pressure is equal to the weight of the water

• The pressure exerted by air on the cardboard is equal to the pressure acting on the cardboard due to the weight of the water

• The section force of the water prevents it from falling

• The upward force exerted by the air on the cardboard is equal to the weight of the water