Pressure Quiz: Ultimate Questions!

1. The figure below shows a box of mass 2 kg.

What is the weight of the box on Earth?

0.2 N

2 N

20 N

200 N

The weight of an object is the force exerted on it due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s^2. The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity. In this case, the box has a mass of 2 kg, so its weight would be 2 kg * 9.8 m/s^2 = 19.6 N. Since the answer choices are given in whole numbers, the closest option is 20 N.

Explanation

The weight of an object is the force exerted on it due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s^2. The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity. In this case, the box has a mass of 2 kg, so its weight would be 2 kg * 9.8 m/s^2 = 19.6 N. Since the answer choices are given in whole numbers, the closest option is 20 N.

2. Which of the following is the unit for Pressure? I. Pa II. Nm III. N/m2

I only

III only

I and III only

II and III only

The unit for pressure is measured in pascals (Pa) and newtons per square meter (N/m2). Both options I and III correctly represent the unit for pressure, making the answer "I and III only". Option II, Nm, is not the correct unit for pressure as it represents a different physical quantity, specifically torque.

Explanation

The unit for pressure is measured in pascals (Pa) and newtons per square meter (N/m2). Both options I and III correctly represent the unit for pressure, making the answer "I and III only". Option II, Nm, is not the correct unit for pressure as it represents a different physical quantity, specifically torque.

3. Which of the following statements is correct?

Pressure of water increases with depth of water. So the dam has to be thicker at the bottom to withstand the higher pressure.

Explanation

Pressure of water increases with depth of water. So the dam has to be thicker at the bottom to withstand the higher pressure.

4. Which of the following is the definition of pressure?

Pressure is the force acting on an object in a downwards direction.

Pressure is the force per unit area applied in a direction parallel to the surface.

Pressure is the force per unit area applied in a direction perpendicular to the surface.

Pressure is the force per unit volume applied in a direction perpendicular to the surface.

The definition of pressure is the force per unit area applied in a direction perpendicular to the surface. This means that pressure is the amount of force exerted on a given area. The force is applied in a direction that is perpendicular, or at a right angle, to the surface. This definition is important in understanding how pressure is measured and how it affects objects and substances.

Explanation

The definition of pressure is the force per unit area applied in a direction perpendicular to the surface. This means that pressure is the amount of force exerted on a given area. The force is applied in a direction that is perpendicular, or at a right angle, to the surface. This definition is important in understanding how pressure is measured and how it affects objects and substances.

5. Since liquid cannot be compressed, the pressure exerted on piston A will be transmitted to piston B. What is the load that can be lifted up at piston B?

0.5 N

50 N

500 N

5000 N

500000 = F / 0.01
F = 5000 N

Explanation

500000 = F / 0.01
F = 5000 N

6. What is the minimum pressure that the box in Q3 can exert on the floor?

26.7 Pa

267 Pa

667 Pa

2220 Pa

Since P = F/A, to obtain minimum pressure, the area must be maximum.

Explanation

Since P = F/A, to obtain minimum pressure, the area must be maximum.

7. The diagram below shows a simple hydraulic system[1] use to lift up a load.

Given that the area of piston A is 1 cm² (0.0001 m²), calculate the pressure exerted on piston A.

[1] Uploader, S.Calculating the mechanical advantage of a hydraulic system, Connexions Web site. https://cnx.org/content/m31723/1.1/, Aug 27, 2009.

50 Pa

500 Pa

5000 Pa

500000 Pa

P = 50 / 0.0001 = 500000 Pa

Explanation

P = 50 / 0.0001 = 500000 Pa

8. The image shows a cross-sectional view of an air foil moving through air.

Which of the following statements is correct?

There is not sufficient information to make a conclusion.

Since the lift is upwards, the pressure a the lower surface of the airfoil must be more than that at the upper surface. Hence, the speed of the air on the upper surface of the foil must be higher.

Explanation

Since the lift is upwards, the pressure a the lower surface of the airfoil must be more than that at the upper surface. Hence, the speed of the air on the upper surface of the foil must be higher.

9. What is the maximum pressure that the box in Q3 can exert on the floor?

26.7 Pa

267 Pa

667 Pa

2220 Pa

Since P = F/A, to obtain maximum pressure, the area must be minimum.

Explanation

Since P = F/A, to obtain maximum pressure, the area must be minimum.

10. The image shows a cross-sectional view of an airfoil moving through air.

Which of the following statements describe the motion of the air foil in the vertical direction.

The air foil is moving downwards with increasing speed.

The air foil is moving upwards at a constant speed.

The air foil is moving upwards with decreasing speed.

The air foil is moving upwards with increasing speed.

Since the lift is more than the weight (size of arrows), there is a net force upwards, so the airfoil must be either moving upwards with increasing speed or moving downwards with decreasing speed.

Explanation

Since the lift is more than the weight (size of arrows), there is a net force upwards, so the airfoil must be either moving upwards with increasing speed or moving downwards with decreasing speed.