CBSE Class 8 Science Exploring Forces (Class 8 NCERT New) Quiz 3

1. What is the effect of gravity on an object in free fall?

A It causes the object to move sideways B It has no effect C It causes the object to accelerate downwards D It causes the object to float

2. If an object is submerged in water and experiences a buoyant force, what can be inferred?

A The object is heavier than water B The object is lighter than water C The object is denser than water D The object is less dense than water

3. Which of the following statements is true about mass?

A Mass is the same as weight B Mass is a measure of the amount of matter C Mass can be created or destroyed D Mass changes with location

4. What happens to the buoyant force when an object is placed in a denser fluid?

A It decreases B It increases C It becomes zero D It remains the same

5. Which of the following best describes contact forces?

A Forces that require physical contact B Forces that act at a distance C Forces that are always equal D Forces that do not affect motion

6. What is the principle of floating and sinking based on?

A Shape of the object B Weight of the object only C Mass of the object only D Density of the object and fluid

7. If an object weighs 50 N in air, what will happen to its weight when submerged in water?

A It will remain the same B It will weigh less C It will weigh more D It will float

8. What is the term for the region around a magnet where magnetic forces can be detected?

A Magnetic field B Electric circuit C Gravitational field D Static zone

9. What type of force is exerted by a magnet on a piece of iron even when they are not touching?

A Contact force B Magnetic force C Frictional force D Gravitational force

10. Which factor does NOT affect the strength of a magnetic force?

A The material of the objects B The distance between the objects C The mass of the objects D The strength of the magnets