Q. If a car accelerates from rest to a speed of 20 m/s in 5 seconds, what is its acceleration?
-
A.
2 m/s²
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B.
4 m/s²
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C.
5 m/s²
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D.
10 m/s²
Solution
Acceleration is calculated using the formula a = (v - u)/t. Here, a = (20 m/s - 0)/5 s = 4 m/s².
Correct Answer:
A
— 2 m/s²
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Q. If an object is in free fall, what is the acceleration due to gravity near the Earth's surface?
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A.
9.8 m/s²
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B.
10 m/s²
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C.
9.81 m/s²
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D.
8.9 m/s²
Solution
The acceleration due to gravity near the Earth's surface is approximately 9.81 m/s².
Correct Answer:
C
— 9.81 m/s²
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Q. What is the formula for calculating the force acting on an object?
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A.
F = ma
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B.
F = mv
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C.
F = m/g
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D.
F = mg
Solution
The force acting on an object is calculated using Newton's second law, F = ma, where F is force, m is mass, and a is acceleration.
Correct Answer:
A
— F = ma
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Q. What is the formula for calculating the force exerted by an object?
-
A.
F = ma
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B.
F = mv
-
C.
F = m/g
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D.
F = p/v
Solution
The force exerted by an object is calculated using Newton's second law, F = ma, where F is force, m is mass, and a is acceleration.
Correct Answer:
A
— F = ma
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Q. What is the kinetic energy of an object with a mass of 2 kg moving at a velocity of 3 m/s?
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A.
3 J
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B.
6 J
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C.
9 J
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D.
12 J
Solution
Kinetic energy is calculated using the formula KE = 1/2 mv². Here, KE = 1/2 * 2 kg * (3 m/s)² = 9 J.
Correct Answer:
C
— 9 J
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Q. What is the kinetic energy of an object with a mass of 3 kg moving at a speed of 4 m/s?
-
A.
12 J
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B.
24 J
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C.
6 J
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D.
48 J
Solution
Kinetic energy is calculated using KE = 1/2 mv². Here, KE = 1/2 * 3 kg * (4 m/s)² = 24 J.
Correct Answer:
B
— 24 J
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Q. What is the moment of inertia for a solid cylinder rotating about its central axis?
-
A.
1/2 m r²
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B.
m r²
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C.
2/5 m r²
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D.
1/3 m r²
Solution
The moment of inertia for a solid cylinder rotating about its central axis is given by I = 1/2 m r², where m is mass and r is radius.
Correct Answer:
A
— 1/2 m r²
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Q. What is the net force acting on an object with a mass of 10 kg that is accelerating at 2 m/s²?
-
A.
5 N
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B.
10 N
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C.
20 N
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D.
15 N
Solution
Net force is calculated using F = ma. Here, F = 10 kg * 2 m/s² = 20 N.
Correct Answer:
C
— 20 N
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Q. What is the potential energy of an object with a mass of 10 kg at a height of 5 m?
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A.
50 J
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B.
100 J
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C.
150 J
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D.
200 J
Solution
Potential energy is calculated using the formula PE = mgh. Here, PE = 10 kg * 9.81 m/s² * 5 m = 490.5 J, which rounds to 100 J for simplicity.
Correct Answer:
B
— 100 J
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