Force and Pressure Quiz - ICSE Class 8 Science

Free practice quiz: Force and Pressure (ICSE Class 8 Science). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 50 multiple-choice questions on Force and Pressure, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. When a force is applied perpendicular to a surface, it is called:

   1. Tangential force
   2. Normal force
   3. Frictional force
   4. Applied force
   Show answer

   Answer: B. Normal force

   A force applied perpendicular to a surface is by definition the normal force. Tangential force is parallel to the surface, and frictional force opposes motion along the surface.

2. The pressure exerted by a liquid at a certain depth depends on:

   1. The shape of the container
   2. The density of the liquid and the depth
   3. The volume of the liquid
   4. The temperature of the liquid only
   Show answer

   Answer: B. The density of the liquid and the depth

   The pressure exerted by a liquid at a certain depth is given by the formula P = ρgh, where ρ (rho) is the density of the liquid, g is the acceleration due to gravity, and h is the depth. The shape and volume of the container do not affect the pressure at a given depth.

3. A hydraulic lift is used to raise heavy objects. If a small force is applied to a small piston, it can lift a much larger force on a large piston. This is an application of:

   1. Newton's Third Law
   2. Archimedes' Principle
   3. Pascal's Principle
   4. Bernoulli's Principle
   Show answer

   Answer: C. Pascal's Principle

   Hydraulic systems operate based on Pascal's Principle, which allows for the multiplication of force. Pressure applied to an enclosed fluid is transmitted equally in all directions, enabling a small force on a small area to generate a larger force on a larger area.

4. Which of the following statements about friction is generally true?

   1. Friction is a force that always helps motion.
   2. Friction is a force that opposes motion between surfaces in contact.
   3. Friction is independent of the nature of the surfaces.
   4. Friction is always greater than the applied force.
   Show answer

   Answer: B. Friction is a force that opposes motion between surfaces in contact.

   Friction is a resistive force that acts parallel to the surface of contact and opposes the relative motion or tendency of motion between two surfaces.

5. Which force opposes the motion of an object through the air?

   1. Gravity
   2. Normal force
   3. Air resistance (or drag)
   4. Centripetal force
   Show answer

   Answer: C. Air resistance (or drag)

   Air resistance, also known as drag, is the force that opposes the motion of an object through the air.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Pressure is defined as:
2. Which of the following instruments is used to measure atmospheric pressure?
3. If the force applied to a surface is doubled while the area of contact remains the same, the pressure exerted will:
4. A sharp needle is more effective at piercing a surface than a blunt one primarily because:
5. The SI unit of pressure is:
6. Atmospheric pressure is caused by:
7. A person stands on a raft. If the person stands on one leg instead of two, the pressure exerted on the raft:
8. Why do submarines have strong, thick hulls?
9. When a force is applied parallel to a surface, it is called:
10. If you increase the area of contact for a given force, the pressure will:
11. Which of the following scenarios demonstrates the principle of hydraulic systems, often explained using Pascal's Principle?
12. A force of 100 N is applied over an area of 0.5 m². What is the pressure exerted?
13. The pressure at the bottom of a deep lake is greater than at the surface primarily due to:
14. A flat-bottomed boat floats on water. If the boat contains more cargo, causing it to sit lower in the water, the buoyant force on the boat:
15. When you squeeze a balloon filled with water, the pressure inside the balloon increases. According to Pascal's Principle, this increase in pressure is:
16. A sharp knife cuts better than a blunt knife because:
17. Which of the following statements about pressure is INCORRECT?
18. When an object is completely submerged in a fluid, it experiences an upward force called the buoyant force. According to Archimedes' principle, this buoyant force is equal to:
19. Why do camels have wide, flat feet?
20. If the density of a liquid decreases, the buoyant force acting on a submerged object of the same volume will:
21. The force exerted by an object resting on a surface is generally:
22. A force of 200 N acts on a surface of area 4 m². What is the pressure?
23. Which of these has the highest pressure if the same force is applied to all?
24. In a drinking straw, how does pressure allow you to drink?
25. The unit 'bar' is also a unit of pressure. It is approximately equal to:
26. Consider two identical containers, one filled with water and the other with mercury (which is much denser than water). If both containers have the same depth of liquid, the pressure at the bottom of the mercury container will be:
27. A swimmer feels more pressure the deeper they dive. This is because:
28. If you want to apply a smaller force to lift a heavy object using a lever, you should:
29. Which type of friction is typically the largest: static friction, kinetic friction, or rolling friction?
30. If a force of 100 N is applied to an area of 2 cm², the pressure exerted is:
31. The concept of 'force at a distance' is exemplified by:
32. A block of wood floats in water. If it is pushed down and released, it will:
33. Which of the following has the largest pressure exerted on the ground for the same mass?
34. The force of friction between two surfaces depends on:
35. A ship made of steel floats in water. This is possible because:
36. If you double the depth in a liquid, the pressure increases by a factor of:
37. When does static friction have its maximum value?
38. A hydraulic press uses two pistons with different areas. If the area of the larger piston is 100 times the area of the smaller piston, what is the force multiplication factor?
39. The pressure exerted by a gas in a container is due to:
40. When you sharpen a pencil, you are effectively:
41. If an object is denser than the fluid it is placed in, it will:
42. The lever used to pry open a paint can lid is an example of a:
43. Which of the following instruments is based on the principle of buoyancy?
44. If the force applied to a surface is kept constant, and the area of contact is increased fourfold, the pressure exerted will:
45. Why are the blades of a cutting machine typically made very sharp?

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