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.
441
How much energy is consumed by a power of one watt used for one hour?
A
6 kWh
B
60 Wh
C
1 kWh
D
1 Wh
▼ View Solution
✓ Answer:
D
1 Wh
E = Pt = 1 W × 1 h = 1 Wh.
442
Which force does not conserve mechanical energy?
A
Spring force
B
Electrostatic force
C
Frictional force
D
Gravitational force
▼ View Solution
✓ Answer:
C
Frictional force
Friction converts mechanical energy into thermal and other forms of energy.
443
Which object has kinetic energy?
A
A book on a table
B
A stretched rubber band
C
A moving stone
D
A compressed spring
▼ View Solution
✓ Answer:
C
A moving stone
Kinetic energy is associated with motion, so a moving stone has it.
444
The kinetic energy of a moving body is:
A
Inversely proportional to its mass and speed squared
B
Directly proportional to speed and inversely proportional to mass
C
Directly proportional to mass and inversely proportional to speed
D
Directly proportional to mass and speed squared
▼ View Solution
✓ Answer:
D
Directly proportional to mass and speed squared
K = (1/2)mv².
445
A car accelerates from rest under constant force F. After travelling distance d, what is its kinetic energy?
A
(F × d)/m
B
F × d
C
(F × d)/2
D
2F × d
▼ View Solution
✓ Answer:
B
F × d
The work-energy theorem gives K - 0 = Fd.
446
An object falls freely from height h. How do its energies change?
A
Both potential and kinetic energy increase.
B
Neither potential nor kinetic energy changes.
C
Potential energy increases and kinetic energy decreases.
D
Potential energy decreases and kinetic energy increases.
▼ View Solution
✓ Answer:
D
Potential energy decreases and kinetic energy increases.
During free fall, gravitational potential energy is converted into kinetic energy.
447
Which statement is not correct?
A
Total energy remains constant before and after a transformation.
B
Energy can only change from one form to another.
C
Total energy is not constant before and after a transformation.
D
Energy can neither be created nor destroyed.
▼ View Solution
✓ Answer:
C
Total energy is not constant before and after a transformation.
The conservation law states that total energy remains constant in an isolated system.
448
When a compressed spring is released, its potential energy is converted into:
A
Mechanical energy
B
Wind energy
C
Elastic potential energy
D
Kinetic energy
▼ View Solution
✓ Answer:
D
Kinetic energy
Stored elastic potential energy becomes kinetic energy during release.
449
Which energy is stored in a compressed spring?
A
Potential
B
Chemical
C
Kinetic
D
Electrical
▼ View Solution
✓ Answer:
A
Potential
A compressed spring stores elastic potential energy.
450
Find the kinetic energy of a 22 kg object moving at 5 m/s.
A
275 J
B
110 J
C
1100 J
D
2750 J
▼ View Solution
✓ Answer:
A
275 J
K = (1/2) × 22 × 5² = 275 J.
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