Practice Work, Power and Energy 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, kinetic energy, potential energy, mechanical energy and the conservation of energy .
The Work, Power and Energy RRB PYQ collection is useful for candidates preparing for Railway examinations and revising important Physics concepts through previous year questions. Questions from this topic can include both conceptual and numerical problems , making regular practice important for improving calculation accuracy and understanding the application of Physics formulas.
Whether you are preparing for RRB NTPC Work, Power and Energy PYQ, RRB Group D Work, Power and Energy PYQ, RRB JE Work, Power and Energy PYQ, RRB ALP Work, Power and Energy PYQ, or RRB Technician Work, Power and Energy PYQ , practice these previous year questions regularly as part of your Railway Physics preparation.
Start practicing Work, Power and Energy RRB PYQs with answers and explanations and strengthen your Railway Physics preparation.
151
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.
152
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.
153
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.
154
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.
155
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.
156
A 10 kg object is raised 5 m above the ground. Calculate its energy. (g = 9.8 m/s²)
A
400 J
B
490 J
C
450 J
D
500 J
▼ View Solution
✓ Answer:
B
490 J
U = mgh = 10 × 9.8 × 5 = 490 J.
157
Find the kinetic energy of an object of mass m moving with uniform velocity V.
A
mv⁻²
B
(1/2)mv²
C
(1/3)mv²
D
mv²
▼ View Solution
✓ Answer:
B
(1/2)mv²
The kinetic energy is K = (1/2)mv².
158
What type of energy is stored in a stretched rubber band?
A
Chemical energy
B
Potential energy
C
Kinetic energy
D
Thermal energy
▼ View Solution
✓ Answer:
B
Potential energy
Stretching stores elastic potential energy.
159
How fast must a 15 kg cat run to have kinetic energy of 120 J?
A
40 m/s
B
0.16 m/s
C
16 m/s
D
4 m/s
▼ View Solution
✓ Answer:
D
4 m/s
v = √(2K/m) = √(240/15) = 4 m/s.
160
What type of energy does a bullet fired from a gun have?
A
Light energy
B
Electrical energy
C
Kinetic energy
D
Potential energy
▼ View Solution
✓ Answer:
C
Kinetic energy
The moving bullet has kinetic energy.
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