Practice Mechanics RRB PYQ questions from Railway examinations, including RRB NTPC PYQ, RRB Group D PYQ, RRB JE PYQ, RRB ALP PYQ and RRB Technician PYQ . This topic-wise Physics question set covers important concepts related to work, power, energy, mass, force, Newton’s laws of motion, momentum, distance, displacement, speed, velocity, acceleration, equations of motion, friction and motion , helping you revise essential Physics concepts for RRB examinations.
Each question includes the correct answer and an explanation to help you understand the concept, strengthen your Physics fundamentals, and revise important Mechanics topics for RRB Railway examinations .
Start practicing Mechanics RRB PYQs and strengthen your Physics preparation.
381
Which quantity gives the rate at which a machine does work?
A
Total force applied
B
Total energy consumption
C
Rate of change of velocity
D
Power
▼ View Solution
✓ Answer:
D
Power
Power measures work done per unit time.
382
Mohan has a mass of 40 kg and climbs 50 steps in 10 s. Each step is 15 cm high. Find his power. (g = 10 m/s²)
A
200 W
B
400 W
C
300 W
D
100 W
▼ View Solution
✓ Answer:
C
300 W
Total height = 50 × 0.15 = 7.5 m. P = mgh/t = 40 × 10 × 7.5/10 = 300 W.
383
Which is not an example of work done?
A
A man pushes against a stationary wall.
B
A trolley moves when a boy pushes it.
C
A force acts in the direction an object moves.
D
A book is raised to some height and carried.
▼ View Solution
✓ Answer:
A
A man pushes against a stationary wall.
The wall does not move, so work done on it is zero.
384
A boy of weight 600 N climbs a rope through 10 m in 20 seconds. Find his power.
A
100 W
B
150 W
C
300 W
D
200 W
▼ View Solution
✓ Answer:
C
300 W
Work = 600 × 10 = 6000 J. Power = 6000/20 = 300 W.
385
A boy moves 20 m while applying a force of 600 N in 4 minutes. Find the power consumed.
A
50 W
B
100 W
C
80 W
D
25 W
▼ View Solution
✓ Answer:
A
50 W
P = Fs/t = 600 × 20/(4 × 60) = 50 W.
386
When force and an object's motion are perpendicular to each other:
A
Power is exercised.
B
No work is done.
C
Power is not exercised.
D
Work is done.
▼ View Solution
✓ Answer:
B
No work is done.
W = Fs cos 90° = 0.
387
Power can be measured in kilowatts and watts. How many watts equal 1 kW?
A
10 W
B
1000 W
C
10000 W
D
100 W
▼ View Solution
✓ Answer:
B
1000 W
The prefix kilo means 1000, so 1 kW = 1000 W.
388
A 50 kg boy climbs 40 stairs in 9 seconds. Each stair is 15 cm high. Find his power. (g = 10 m/s²)
A
333.33 W
B
333.34 J
C
333.34 m·s
D
387.5 W
▼ View Solution
✓ Answer:
A
333.33 W
h = 40 × 0.15 = 6 m. P = 50 × 10 × 6/9 ≈ 333.33 W.
389
Which angle between force and displacement gives negative work?
A
45°
B
0°
C
90°
D
180°
▼ View Solution
✓ Answer:
D
180°
At 180°, W = Fs cos 180° = -Fs.
390
A car engine produces a force of 10000 N and moves the car 1.2 km in 2 minutes. Find its power.
A
100 kW
B
200 kW
C
1000 kW
D
10 kW
▼ View Solution
✓ Answer:
A
100 kW
P = Fs/t = 10000 × 1200/120 = 100000 W = 100 kW.
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