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.

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
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   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
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   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
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   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.
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   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
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   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.

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