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.
431
Find the energy of a 5 kg object at a height of 8 m above the ground. (g = 9.8 m/s²)
A
300 J
B
784 J
C
392 J
D
400 J
▼ View Solution
✓ Answer:
C
392 J
U = mgh = 5 × 9.8 × 8 = 392 J.
432
In which situation is potential energy stored?
A
Lighting a matchstick
B
Rotating a pencil on a table
C
Pushing a vehicle on a level road
D
Stretching a rubber band
▼ View Solution
✓ Answer:
D
Stretching a rubber band
Stretching a rubber band stores elastic potential energy.
433
A 2 kg body has kinetic energy of 100 J. Find its speed.
A
10 m/s
B
0 m/s
C
50 m/s
D
20 m/s
▼ View Solution
✓ Answer:
A
10 m/s
v = √(2K/m) = √(200/2) = 10 m/s.
434
The potential energy of an object is equal to its:
A
Transferred energy
B
Change in speed
C
Energy loss
D
Change in velocity
▼ View Solution
✓ Answer:
A
Transferred energy
The PDF describes potential energy as energy transferred to and stored in an object through a change in position or configuration.
435
Which is part of mechanical energy?
A
Potential energy
B
Light energy
C
Chemical energy
D
Thermal energy
▼ View Solution
✓ Answer:
A
Potential energy
Mechanical energy is kinetic energy plus potential energy.
436
On which quantities does kinetic energy depend? (i) Mass (ii) Speed squared (iii) Pressure
A
Only (iii)
B
Both (i) and (ii)
C
Only (i)
D
Both (ii) and (iii)
▼ View Solution
✓ Answer:
B
Both (i) and (ii)
K = (1/2)mv² depends on mass and speed squared.
437
Find the kinetic energy of a 25 kg object moving at 2 m/s.
A
80 J
B
50 J
C
120 J
D
100 J
▼ View Solution
✓ Answer:
B
50 J
K = (1/2) × 25 × 2² = 50 J.
438
An object falls freely from height h. When is its kinetic energy greatest?
A
After falling one-quarter of the way
B
At the start of the fall
C
Just before hitting the earth
D
Halfway down
▼ View Solution
✓ Answer:
C
Just before hitting the earth
Its speed and kinetic energy increase during the fall and are greatest just before impact.
439
For a conservative force, potential energy:
A
Depends on the path
B
Is zero
C
Can be defined for each configuration of the system
D
Depends on the work done by friction
▼ View Solution
✓ Answer:
C
Can be defined for each configuration of the system
A conservative force has a potential-energy function, with ΔU = -Wconservative.
440
A body of mass m moves with velocity V and kinetic energy K. If its velocity doubles, what is its new kinetic energy?
A
K/2
B
2K
C
K
D
4K
▼ View Solution
✓ Answer:
D
4K
K ∝ v² for fixed mass. Doubling speed multiplies kinetic energy by four.
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