WORK AND ENERGY

 

🎯 MDCAT WORK & ENERGY TEST

⚡ WORK & ENERGY - 25 MCQs ⚡

Question 1/25

Correct 0

Wrong 0

Time 20:00

Q1

A force of 10 N is applied to an object, causing it to move 5 m. What is the work done?

A) 50 JB) 20 JC) 10 JD) 5 J

Correct: A) 50 J
Explanation: W = F × d = 10 × 5 = 50 J

Q2

An object of mass 2 kg is lifted to a height of 3 m. PE gained? (g=10)

A) 60 JB) 60 JC) 20 JD) 10 J

Correct: B) 60 J
Explanation: PE = mgh = 2 × 10 × 3 = 60 J

Q3

A force of 2 N moves an object 200 m. Work done?

A) 400 JB) 200 JC) 100 JD) 50 J

Correct: A) 400 J
Explanation: W = F × d = 2 × 200 = 400 J

Q4

KE of 5 kg object moving at 2 m/s?

A) 10 JB) 20 JC) 30 JD) 40 J

Correct: A) 10 J
Explanation: KE = 1/2 mv² = 0.5 × 5 × 4 = 10 J

Q5

5 N force at 30° moves object 4 m. Work done?

A) 20 JB) 17.3 JC) 10 JD) 5 J

Correct: B) 17.3 J
Explanation: W = Fdcosθ = 5 × 4 × cos30° = 17.3 J

Q6

100kg car 0 to 25 m/s in 6 s. Average power?

A) 5208 WB) 2604 WC) 1302 WD) 651 W

Correct: A) 5208 W
Explanation: KE = 31250J, P = 31250/6 = 5208W

Q7

PE of 10 kg object at 5 m height? (g=10)

A) 500 JB) 250 JC) 125 JD) 50 J

Correct: A) 500 J
Explanation: PE = mgh = 10 × 10 × 5 = 500 J

Q8

20 N force moves object 10 m. Work done?

A) 200 JB) 150 JC) 100 JD) 50 J

Correct: A) 200 J
Explanation: W = F × d = 20 × 10 = 200 J

Q9

4.5 N force moves object 300 m. Work done?

A) 1350 JB) 675 JC) 337.5 JD) 168.75 J

Correct: A) 1350 J
Explanation: W = F × d = 4.5 × 300 = 1350 J

Q10

KE of 2 kg object at 4 m/s?

A) 16 JB) 12 JC) 8 JD) 4 J

Correct: A) 16 J
Explanation: KE = 1/2 mv² = 0.5 × 2 × 16 = 16 J

Q11

One complete rotation around circular path is called?

A) RevolutionB) RotationC) CirculationD) Orbit

Correct: A) Revolution
Explanation: One complete round = 1 revolution

Q12

Wheel rotates 5 times. How many revolutions?

A) 1B) 2C) 5D) 10

Correct: C) 5
Explanation: 5 rotations = 5 revolutions

Q13

Radius 3m, 2 revolutions. Total distance?

A) 6π mB) 12π mC) 18π mD) 24π m

Correct: B) 12π m
Explanation: Distance = 2πr × 2 = 12π m

Q14

10 rotations in 2 minutes. RPM?

A) 2B) 5C) 10D) 20

Correct: B) 5
Explanation: 10/2 = 5 rev/min

Q15

50 rotations in 1 minute. RPS?

A) 0.5B) 0.83C) 1D) 1.2

Correct: B) 0.83
Explanation: 50/60 = 0.83 rev/sec

Q16

Angular displacement for 1 revolution?

A) π radB) 2π radC) 3π radD) 4π rad

Correct: B) 2π rad
Explanation: 1 revolution = 2π radians

Q17

3 rotations. Total angular displacement?

A) 3π radB) 6π radC) 9π radD) 12π rad

Correct: B) 6π rad
Explanation: 3 × 2π = 6π rad

Q18

20 rotations in 4 minutes. RPM?

A) 2B) 4C) 5D) 10

Correct: C) 5
Explanation: 20/4 = 5 rev/min

Q19

Radius 2m, 5 revolutions. Total distance?

A) 10π mB) 20π mC) 30π mD) 40π m

Correct: B) 20π m
Explanation: Distance = 2πr × 5 = 20π m

Q20

15 rotations in 3 minutes. RPM?

A) 3B) 5C) 7D) 10

Correct: B) 5
Explanation: 15/3 = 5 rev/min

Q21

SI unit of angular measurement?

A) RadianB) DegreeC) RevolutionD) Circle

Correct: A) Radian
Explanation: SI unit is radian

Q22

Degrees in 1 revolution?

A) 180°B) 270°C) 360°D) 450°

Correct: C) 360°
Explanation: 1 revolution = 360°

Q23

120° is what fraction of revolution?

A) 1/3B) 1/2C) 2/3D) 3/4

Correct: A) 1/3
Explanation: 120/360 = 1/3

Q24

270° in radians?

A) π/2 radB) 3π/2 radC) π radD) 2π rad

Correct: B) 3π/2 rad
Explanation: 270° × π/180 = 3π/2 rad

Q25

π radians in degrees?

A) 90°B) 120°C) 180°D) 360°

Correct: C) 180°
Explanation: π rad = 180°

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Correct: 0 / 25

Wrong: 0 / 25

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