Force and Pressure and Friction Quiz

Which of the following correctly explains why mountain climbers carry oxygen tanks?

1. The pressure at higher altitudes is greater, making it hard to breathe.
2. The oxygen at higher altitudes is heavier.
3. The temperature is lower, causing breathing difficulty.
4. The pressure at higher altitudes is less, reducing the oxygen intake.

Answer: (d) The pressure at higher altitudes is less, reducing the oxygen intake.

A brick is placed on a table in three different orientations: lying flat, on its edge, and standing on its end. If the force due to the brick’s weight remains the same, which orientation exerts the greatest pressure on the table?

1. Lying flat
2. On its edge
3. Standing on its end
4. Pressure is the same in all orientations.

Answer: (c) Standing on its end

When a basketball player jumps to make a shot, what forces act on the player while they are in the air?

1. Only the gravitational force pulling them downward.
2. Only the upward force due to their jump.
3. Both gravitational force downward and air resistance upward.
4. No force acts on the player once they leave the ground.

Answer: (c) Both gravitational force downward and air resistance upward.

A heavy book is resting on a table. Which of the following best describes the force of pressure exerted by the book on the table?

1. It is evenly distributed across the entire surface of the book.
2. It is concentrated at a single point where the book touches the table.
3. It is greater at the edges of the book than at the centre.
4. It depends on the weight of the book and the area of contact with the table.

Answer: (d) It depends on the weight of the book and the area of contact with the table.

A cyclist applies a 200 N force to a bicycle of mass 20 kg, moving it forward. Suddenly, a 50 N resistive force acts against motion. What is the acceleration of the bicycle?

1. 7.5 m/s²
2. 10.0 m/s²
3. 5.0 m/s²
4. 6.0 m/s²

Answer: (a) 7.5 m/s²

A balloon remains unaffected when pressed with a finger but pops when pricked with a needle. Why?

1. The needle applies force over a small area, increasing pressure.
2. The balloon has a weak outer surface.
3. The finger has no force, but the needle does.
4. The needle has a special property that bursts balloons.

Answer: (a) The needle applies force over a small area, increasing pressure.

A wooden beam of weight 1500 N has dimensions 2.0 m × 0.5 m × 0.2 m. It is placed on the ground in two different ways: Case 1: The 2.0 m × 0.5 m surface touches the ground. Case 2: The 0.5 m × 0.2 m surface touches the ground. Which of the following is true about the pressure exerted on the ground?

1. Pressure in Case 1 is greater than in Case 2
2. Pressure in Case 2 is greater than in Case 1
3. Pressure is the same in both cases
4. Pressure depends only on the weight, not on the surface area

Answer: (b) Pressure in Case 2 is greater than in Case 1

The diagram below shows a dam holding water. The depth of water at point A is 10 m, while at point B it is 30 m. At which point is the water pressure highest, and why?

1. Point A, because it is closer to the surface
2. Point B, because pressure increases with depth
3. Both points experience the same pressure
4. Pressure depends only on the total water volume, not depth.

Answer: (b) Point B, because pressure increases with depth

A syringe works when pressed and releases fluid. Assertion (A): A syringe operates using the principles of pressure transmission in liquids. Reason (R): Liquids exert pressure equally in all directions when force is applied. Choose the correct option.

1. Both A and R are true, and R explains A
2. Both A and R are true, but R does not explain A
3. A is true, but R is false
4. A is false, but R is true

Answer: (a) Both A and R are true, and R explains A

A U-tube contains a liquid with different heights on each side. The left side has a denser liquid, while the right side has a lighter liquid. What happens if more of the lighter liquid is added to the right side?

1. Both liquid levels will remain the same
2. The level of the denser liquid on the left will decrease
3. The level of the denser liquid on the left will rise
4. The denser liquid will overflow from the left side

Answer: (c) The level of the denser liquid on the left will rise