LESSON 9 EXAM

1. Work is defined as:

Force applied on an object

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Force × distance moved in direction of force

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Force × time

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Force × velocity

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2. The SI unit of work is:

Newton (N)

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Watt (W)

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Joule (J)

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Pascal (Pa)

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3. Work is a:

Vector quantity

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Scalar quantity

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Base quantity

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Dimensionless quantity

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4. The mathematical formula for work is:

W = F/d

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W = F + d

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W = F × d × cos θ

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W = F × d × sin θ

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5. When the angle between force and displacement is 90°, the work done is:

Maximum

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Minimum

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Zero

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Negative

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6. A force of 20 N moves an object 5 m in the direction of the force. The work done is:

4 J

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25 J

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100 J

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15 J

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7. If a person lifts a book and holds it stationary, the work done by the person is:

Maximum

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Minimum

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Zero

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Negative

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8. Work done against gravity is:

Always positive

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Always negative

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Zero

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Can be positive or negative

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9. When force and displacement are in opposite directions, work done is:

Positive

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Negative

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Zero

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Maximum

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10. The work done by friction is generally:

Positive

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Negative

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Zero

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Variable

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11. A 50 N force is applied at 60° to the horizontal to move an object 10 m horizontally. Work done is:

500 J

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433 J

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250 J

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866 J

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12. No work is done when:

Force is applied

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Object moves

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Force is perpendicular to displacement

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Force is parallel to displacement

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13. The work done by centripetal force in circular motion is:

Maximum

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Minimum

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Zero

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Equal to kinetic energy

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14. A porter carries a 20 kg bag horizontally for 100 m. Work done against gravity is: (g = 10 m/s²)

20,000 J

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2,000 J

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200 J

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0 J

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15. Work has the same unit as:

Force

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Power

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Energy

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Momentum

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16. Energy is defined as:

Force applied on objects

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Ability to do work

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Rate of doing work

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Force per unit area

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17. The SI unit of energy is:

Newton (N)

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Watt (W)

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Joule (J)

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Kilogram (kg)

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18. Kinetic energy depends on:

Mass only

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Velocity only

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Both mass and velocity

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Height only

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19. The formula for kinetic energy is:

KE = mv

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KE = ½mv²

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KE = mv²

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KE = ½mv

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20. Potential energy is energy due to:

Motion

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Position or configuration

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Speed

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Acceleration

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21. Gravitational potential energy is given by:

PE = mgh

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PE = ½mgh

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PE = mg/h

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PE = mh/g

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22. A 2 kg object moving at 10 m/s has kinetic energy of:

20 J

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100 J

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200 J

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50 J

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23. If velocity of an object doubles, its kinetic energy:

Doubles

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Halves

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Becomes four times

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Remains same

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24. A 5 kg book is placed 2 m above the ground. Its potential energy is: (g = 10 m/s²)

10 J

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50 J

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100 J

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25 J

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25. The law of conservation of energy states that:

Energy can be created

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Energy can be destroyed

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Energy can neither be created nor destroyed

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Energy always increases

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26. At the highest point of a projectile’s path:

KE is maximum, PE is minimum

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KE is minimum, PE is maximum

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Both KE and PE are maximum

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Both KE and PE are minimum

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27. Which form of energy is stored in a stretched spring?

Kinetic energy

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Gravitational potential energy

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Elastic potential energy

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Chemical energy

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28. Total mechanical energy is:

KE only

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PE only

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KE + PE

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KE – PE

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29. A ball dropped from height h hits the ground with velocity v. The relationship is:

v = √(gh)

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v = √(2gh)

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v = gh

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v = 2gh

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30. Energy transformations occur in:

Machines only

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Living organisms only

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All natural processes

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Laboratory only

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LESSON 9 EXAM

LESSON 9 EXAM

ola September 29, 2025

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