Grade 9 : Science - 11. Work/Energy (Set 1)

Question 1

Calculate the work done when a force of 15 N moves an object 4 m in the direction of the force.

Accepted Answer

A) 60 J

Answer

B) 30 J

Answer

C) 19 J

Answer

D) 11 J

Question 2

A body of mass 2 kg is moving with a velocity of 3 m/s. Calculate its kinetic energy.

Accepted Answer

B) 9 J

Answer

A) 18 J

Answer

C) 6 J

Answer

D) 12 J

Question 3

What is the gravitational potential energy of a 5 kg object at a height of 10 m? (Take $g = 9.8 m/s^2$)

Accepted Answer

C) 490 J

Answer

A) 400 J

Answer

B) 500 J

Answer

D) 250 J

Question 4

If the velocity of an object is doubled, what happens to its kinetic energy?

Accepted Answer

A) It quadruples

Answer

B) It doubles

Answer

C) It remains the same

Answer

D) It becomes half

Question 5

Which of the following is the standard SI unit for work?

Accepted Answer

B) Joule

Answer

A) Watt

Answer

C) Newton

Answer

D) Pascal

Question 6

A student lifts a 10 kg bag 2 m high. What is the work done against gravity? ($g = 10 m/s^2$)

Accepted Answer

C) 200 J

Answer

A) 100 J

Answer

B) 150 J

Answer

D) 50 J

Question 7

What is the power output if 500 J of work is done in 10 seconds?

Accepted Answer

A) 50 W

Answer

B) 5000 W

Answer

C) 5 W

Answer

D) 25 W

Question 8

An object falls freely. What is the energy change occurring?

Accepted Answer

D) Potential to kinetic

Answer

A) Potential to chemical

Answer

B) Kinetic to potential

Answer

C) Thermal to mechanical

Question 9

Work done is zero when the force and displacement are at what angle?

Accepted Answer

A) 90 degrees

Answer

B) 0 degrees

Answer

C) 45 degrees

Answer

D) 180 degrees

Question 10

Energy is defined as:

Accepted Answer

B) Capacity to do work

Answer

A) Force applied over distance

Answer

C) Rate of work done

Answer

D) Mass times acceleration

Question 11

A 4 kg mass is raised 3 m. How much work is done? ($g=9.8 m/s^2$)

Accepted Answer

C) 117.6 J

Answer

A) 100 J

Answer

B) 110 J

Answer

D) 120 J

Question 12

Two objects have masses $m$and$2m$but identical velocities. What is the ratio of their kinetic energies?

Accepted Answer

A) 1:2

Answer

B) 2:1

Answer

C) 1:4

Answer

D) 4:1

Question 13

If the height of an object is tripled, what happens to its potential energy?

Accepted Answer

B) No change

Answer

A) It triples

Answer

C) It is reduced to one-third

Answer

D) It becomes 9 times

Question 14

Which of these is a form of energy?

Accepted Answer

A) Heat

Answer

B) Velocity

Answer

C) Force

Answer

D) Acceleration

Question 15

Calculate power for a motor doing 1200 J in 30 seconds.

Accepted Answer

D) 40 W

Answer

A) 20 W

Answer

B) 30 W

Answer

C) 36000 W

Question 16

A car moves at a constant speed. What is the net work done on the car?

Accepted Answer

B) Zero

Answer

A) Positive

Answer

C) Negative

Answer

D) Infinite

Question 17

If an object's mass is doubled and velocity is halved, what happens to kinetic energy?

Accepted Answer

A) It becomes half

Answer

B) It remains the same

Answer

C) It doubles

Answer

D) It quadruples

Question 18

What is the unit of power?

Accepted Answer

C) Watt

Answer

A) Joule/second^2

Answer

B) Newton-meter

Answer

D) Joule-second

Question 19

Energy can neither be created nor destroyed is the law of:

Accepted Answer

B) Conservation of energy

Answer

A) Motion

Answer

C) Thermodynamics

Answer

D) Gravity

Question 20

A ball is thrown upward. At its highest point:

Accepted Answer

D) KE is zero

Answer

A) KE is maximum

Answer

B) PE is zero

Answer

C) Velocity is maximum

Set 1Grade 9 : Science - Work/Energy

Grade 9 : Science - Work/Energy

Examination Instructions:

Discussion 0

Rating & Discussion Locked

Set 1Grade 9 : Science - Work/Energy

Grade 9 : Science - Work/Energy

Examination Instructions:

Discussion 0

Rating & Discussion Locked

Set 1Grade 9 : Science - Work/Energy

Grade 9 : Science - Work/Energy

Examination Instructions:

Share This Quiz

Discussion 0

Rating & Discussion Locked

More Quizzes for Grade 9

Grade 9 : Mathematics - Surface Area/Volume

Grade 9 : Mathematics - Triangles

Grade 9 : Mathematics - Linear Equations

Grade 9 : Mathematics - Triangles

Grade 9 : Mathematics - Circles

Grade 9 : Mathematics - Mensuration

Set 1Grade 9 : Science - Work/Energy

Grade 9 : Science - Work/Energy

Examination Instructions:

Share This Quiz

Discussion 0

Rating & Discussion Locked

More Quizzes for Grade 9

Grade 9 : Mathematics - Surface Area/Volume

Grade 9 : Mathematics - Triangles

Grade 9 : Mathematics - Linear Equations

Grade 9 : Mathematics - Triangles

Grade 9 : Mathematics - Circles

Grade 9 : Mathematics - Mensuration