Exploring Forces — Practice

Q1. In science, a force is defined as

• A. A push or pull applied on an object
• B. Only a pull applied on an object
• C. Only the speed of a moving object
• D. The weight of a stationary object

Q2. The SI unit of force is the

• A. Kilogram
• B. Newton
• C. Joule
• D. Pascal

Q3. The force exerted by the action of our muscles is called

• A. Frictional force
• B. Magnetic force
• C. Muscular force
• D. Gravitational force

Q4. Friction acts in a direction that is

• A. Same as the direction of motion
• B. Perpendicular to the direction of motion
• C. Random and changes every second
• D. Opposite to the direction of motion

Q5. Magnetic force is classified as a

• A. Non-contact force
• B. Contact force
• C. Muscular force
• D. Frictional force

Q6. The force exerted by a charged body on another charged or uncharged body is called

• A. Magnetic force
• B. Electrostatic force
• C. Frictional force
• D. Gravitational force

Q7. The force with which the Earth attracts objects towards itself is called

• A. Electrostatic force
• B. Magnetic force
• C. Gravitational force
• D. Muscular force

Q8. The SI unit of weight is

• A. Kilogram (kg)
• B. Gram (g)
• C. Pascal (Pa)
• D. Newton (N)

Q9. The amount of matter contained in an object is called its

• A. Mass
• B. Weight
• C. Volume
• D. Density

Q10. The upward force applied by a liquid on an object placed in it is known as

• A. Frictional force
• B. Upthrust or buoyant force
• C. Magnetic force
• D. Muscular force

Q11. A football lying on the ground starts moving when kicked. This shows that a force can

• A. Only change the shape of an object
• B. Make a stationary object move from rest
• C. Only stop a moving object
• D. Only change the colour of an object

Q12. Pressing an inflated balloon changes the shape of the balloon. This is an example of force

• A. Causing a change in speed
• B. Causing a change in direction
• C. Causing a change in the shape of an object
• D. Causing a change in the colour of an object

Q13. A ball rolling on flat ground eventually comes to rest on its own. The force that brings it to rest is

• A. Gravitational force
• B. Electrostatic force
• C. Magnetic force
• D. Friction

Q14. Friction between two surfaces arises mainly because

• A. Both surfaces are perfectly smooth
• B. The minute irregularities on the two surfaces lock into each other
• C. The surfaces are at different temperatures
• D. The surfaces are made of different colours

Q15. Unlike magnetic and electrostatic forces, gravitational force is

• A. Sometimes attractive and sometimes repulsive
• B. Always repulsive
• C. Always attractive
• D. Only present near magnets