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.
421
The elastic potential energy of a deformed body is:
A
Stress/strain
B
(1/2) × stress × strain × volume
C
Stress × strain / volume
D
Stress × strain
▼ View Solution
✓ Answer:
B
(1/2) × stress × strain × volume
For linear elastic deformation, energy density is (1/2) × stress × strain. Multiply by volume for total energy.
422
What is the dimensional formula of mechanical energy, the total energy due to position and motion?
A
[M¹L²]
B
[ML²T⁻³]
C
[M²L²T⁻¹]
D
[M¹L²T⁻²]
▼ View Solution
✓ Answer:
D
[M¹L²T⁻²]
Energy has dimensions of work: force × distance = [MLT⁻²][L] = [ML²T⁻²].
423
What type of energy is gained by a moving body due to its motion?
A
Potential energy
B
Kinetic energy
C
Nuclear energy
D
Electromagnetic energy
▼ View Solution
✓ Answer:
B
Kinetic energy
The energy associated with motion is kinetic energy: K = (1/2)mv².
424
Energy gained by an object because of a change in position or configuration is called:
A
Potential energy
B
Nuclear energy
C
Electromagnetic energy
D
Kinetic energy
▼ View Solution
✓ Answer:
A
Potential energy
Potential energy is associated with position or configuration.
425
A ball of mass 50 g moves at 15 m/s. Find its kinetic energy.
A
7.500 J
B
3.750 J
C
5.625 J
D
1.875 J
▼ View Solution
✓ Answer:
C
5.625 J
m = 0.05 kg. K = (1/2)mv² = 0.5 × 0.05 × 15² = 5.625 J.
426
A 0.5 kg ball moves at 6 m/s. Find its kinetic energy.
A
15 J
B
6 J
C
9 J
D
12 J
▼ View Solution
✓ Answer:
C
9 J
K = (1/2) × 0.5 × 6² = 9 J.
427
A 2 kg body moves at 5 m/s. Find its kinetic energy.
A
100 J
B
25 J
C
10 J
D
50 J
▼ View Solution
✓ Answer:
B
25 J
K = (1/2) × 2 × 5² = 25 J.
428
Find the kinetic energy of a 10 kg body moving at 5 m/s.
A
125 J
B
50 J
C
120 J
D
25 J
▼ View Solution
✓ Answer:
A
125 J
K = (1/2) × 10 × 5² = 125 J.
429
Which statement about conservation of energy is correct?
A
It applies to all situations and all types of energy conversion.
B
Energy cannot change from one form to another.
C
Total energy differs before and after conversion.
D
Energy can be created or destroyed.
▼ View Solution
✓ Answer:
A
It applies to all situations and all types of energy conversion.
Energy is conserved in an isolated system, although it can change form.
430
Which statements describe conservation of energy? I. Energy can change from one form to another. II. Energy can neither be created nor destroyed.
A
Both I and II are correct.
B
Only I is correct.
C
Neither I nor II is correct.
D
Only II is correct.
▼ View Solution
✓ Answer:
A
Both I and II are correct.
Energy can change form while total energy remains conserved.
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