CBSE Class 8 Science Exploring Forces (Class 8 NCERT New) Quiz 1

1. What are contact forces?

A Contact forces are forces that occur between objects in direct physical contact. B Forces that act at a distance without physical contact. C Forces that only occur in liquids and gases. D Forces that are always equal and opposite in nature.

2. Give two examples of non-contact forces.

A Gravitational force, Magnetic force B Normal force C Frictional force D Tension force

3. What is frictional force?

A Frictional force is the force that pulls two surfaces apart. B Frictional force is the force that opposes the relative motion of two surfaces in contact. C Frictional force is the force that enhances the motion of two surfaces in contact. D Frictional force is the force that acts only on stationary objects.

4. How does gravitational force affect objects on Earth?

A Gravitational force causes objects to be pulled towards the Earth, giving them weight and affecting their motion. B Gravitational force pushes objects away from the Earth, causing them to float. C Gravitational force has no effect on the motion of objects on Earth. D Gravitational force only affects objects in space, not on Earth.

5. What is the role of electrostatic force in everyday life?

A Electrostatic force plays a crucial role in everyday life by affecting interactions between charged objects, enabling technologies like printers, and causing common phenomena like static cling. B Electrostatic force is only relevant in scientific experiments. C Electrostatic force has no impact on technology or daily activities. D Electrostatic force is primarily responsible for gravitational attraction.

6. Name a situation where frictional force is beneficial.

A Driving on a slick road B Pushing a heavy object C Walking on a surface. D Sliding down a hill

7. Explain how gravitational force differs from electrostatic force.

A Gravitational force is always attractive and acts between masses, while electrostatic force can be attractive or repulsive and acts between charged particles. B Gravitational force varies with distance, but electrostatic force does not. C Electrostatic force acts only on masses, while gravitational force acts on charged particles. D Gravitational force can be repulsive, while electrostatic force is always attractive.

8. What factors affect the strength of frictional force?

A The temperature of the environment B The nature of surfaces, normal force, and presence of lubricants. C The weight of the object D The color of the surfaces

9. Describe a scenario where non-contact forces are at play.

A A magnet attracting a paperclip without touching it. B A balloon rising when filled with helium. C A person pushing a car to move it. D A paperclip falling to the ground due to gravity.

10. How do contact forces differ from non-contact forces?

A Contact forces are always stronger than non-contact forces. B Contact forces can only occur in liquids. C Non-contact forces require physical touch to act. D Contact forces differ from non-contact forces in that contact forces require physical interaction, whereas non-contact forces operate at a distance.