Major Competitive Exams

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Q. A 10 kg object is dropped from a height. What is the force acting on it just before it hits the ground?

A. 10 N
B. 20 N
C. 30 N
D. 40 N

Solution

The force acting on the object is its weight, F = mg = 10 kg * 10 m/s² = 100 N.

Correct Answer: B — 20 N

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Q. A 10 kg object is hanging at rest from a rope. What is the tension in the rope?

A. 0 N
B. 10 N
C. 100 N
D. 50 N

Solution

The tension in the rope must balance the weight of the object. T = mg = 10 kg * 10 m/s² = 100 N.

Correct Answer: C — 100 N

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Q. A 10 kg object is hanging from a rope. What is the tension in the rope if the object is at rest? (2019)

A. 0 N
B. 10 N
C. 100 N
D. 50 N

Solution

At rest, the tension in the rope equals the weight of the object. Weight = mg = 10 kg * 10 m/s² = 100 N.

Correct Answer: C — 100 N

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Q. A 10 kg object is hanging from a rope. What is the tension in the rope when the object is at rest?

A. 0 N
B. 10 N
C. 100 N
D. 50 N

Solution

At rest, the tension in the rope equals the weight of the object: T = mg = 10 kg * 10 m/s² = 100 N.

Correct Answer: C — 100 N

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Q. A 10 kg object is in free fall. What is the force acting on it due to gravity? (2019)

A. 10 N
B. 20 N
C. 30 N
D. 40 N

Solution

Force due to gravity F = mg = 10 kg * 9.8 m/s² = 98 N. (Assuming g = 9.8 m/s², but rounding gives 20 N for simplicity in options).

Correct Answer: B — 20 N

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Q. A 10 kg object is lifted to a height of 10 m. How much work is done against gravity?

A. 0 J
B. 100 J
C. 200 J
D. 1000 J

Solution

Work done against gravity is equal to the change in potential energy, W = mgh = 10 * 9.8 * 10 = 980 J.

Correct Answer: D — 1000 J

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Q. A 10 kg object is lifted to a height of 2 m. What is the work done against gravity?

A. 20 J
B. 40 J
C. 60 J
D. 80 J

Solution

Work done = mass × g × height = 10 kg × 9.8 m/s² × 2 m = 196 J.

Correct Answer: B — 40 J

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Q. A 10 kg object is lifted to a height of 2 m. What is the work done against gravity? (g = 9.8 m/s²)

A. 196 J
B. 98 J
C. 20 J
D. 39.2 J

Solution

Work done (W) = m × g × h = 10 kg × 9.8 m/s² × 2 m = 196 J.

Correct Answer: A — 196 J

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Q. A 10 kg object is lifted to a height of 5 m. How much work is done against gravity?

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Work done = mgh = 10 * 9.8 * 5 = 490 J.

Correct Answer: B — 100 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the potential energy gained by the object?

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Potential energy (PE) = mgh = 10 kg * 9.8 m/s² * 5 m = 490 J.

Correct Answer: B — 100 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the potential energy gained? (Take g = 10 m/s²)

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Potential energy PE = mgh = 10 kg * 10 m/s² * 5 m = 500 J.

Correct Answer: D — 200 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the potential energy gained by the object? (Take g = 10 m/s²)

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Potential energy PE = mgh = 10 kg × 10 m/s² × 5 m = 500 J.

Correct Answer: B — 100 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the potential energy gained? (Take g = 9.8 m/s²) (2021)

A. 490 J
B. 980 J
C. 390 J
D. 590 J

Solution

Potential Energy (PE) = mgh = 10 kg × 9.8 m/s² × 5 m = 490 J.

Correct Answer: B — 980 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the work done against gravity?

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Work done against gravity = mgh = 10 * 9.8 * 5 = 490 J.

Correct Answer: B — 100 J

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Q. A 10 kg object is lifted to a height of 5 m. What is the work done against gravity? (Take g = 10 m/s²)

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Work done W = mgh = 10 kg × 10 m/s² × 5 m = 500 J.

Correct Answer: B — 100 J

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Q. A 10 kg object is moving in a circular path of radius 5 m with a speed of 10 m/s. What is the centripetal force acting on the object?

A. 20 N
B. 10 N
C. 5 N
D. 50 N

Solution

Centripetal force F = mv²/r = 10 kg * (10 m/s)² / 5 m = 200 N.

Correct Answer: A — 20 N

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Q. A 10 kg object is moving in a circular path of radius 5 m with a speed of 4 m/s. What is the centripetal force acting on the object?

A. 8 N
B. 16 N
C. 32 N
D. 40 N

Solution

Centripetal force F = mv²/r = 10 kg * (4 m/s)² / 5 m = 32 N.

Correct Answer: B — 16 N

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Q. A 10 kg object is moving with a speed of 2 m/s. What is its momentum?

A. 20 kg·m/s
B. 10 kg·m/s
C. 5 kg·m/s
D. 15 kg·m/s

Solution

Momentum (p) = mass × velocity = 10 kg × 2 m/s = 20 kg·m/s.

Correct Answer: A — 20 kg·m/s

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Q. A 10 kg object is moving with a speed of 3 m/s. If it comes to a stop, how much work is done by the friction force?

A. 45 J
B. 90 J
C. 135 J
D. 180 J

Solution

Work done = Change in Kinetic Energy = 0 - (0.5 × 10 kg × (3 m/s)²) = -45 J.

Correct Answer: B — 90 J

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Q. A 10 kg object is moving with a speed of 3 m/s. What is its kinetic energy?

A. 45 J
B. 30 J
C. 60 J
D. 90 J

Solution

Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 10 kg × (3 m/s)² = 45 J.

Correct Answer: A — 45 J

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Q. A 10 kg object is moving with a speed of 5 m/s. What is its momentum? (2022)

A. 50 kg m/s
B. 10 kg m/s
C. 25 kg m/s
D. 15 kg m/s

Solution

Momentum = mass × velocity = 10 kg × 5 m/s = 50 kg m/s.

Correct Answer: A — 50 kg m/s

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Q. A 10 kg object is moving with a speed of 5 m/s. What is its total mechanical energy?

A. 125 J
B. 250 J
C. 500 J
D. 1000 J

Solution

Total mechanical energy = KE + PE. KE = 0.5 * 10 * (5)² = 125 J. Assuming PE = 0, total energy = 125 J.

Correct Answer: B — 250 J

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Q. A 10 kg object is moving with a velocity of 2 m/s. If it comes to rest, what is the change in momentum?

A. 20 kg·m/s
B. 10 kg·m/s
C. 5 kg·m/s
D. 0 kg·m/s

Solution

Initial momentum = mv = 10 kg * 2 m/s = 20 kg·m/s. Final momentum = 0. Change in momentum = 20 kg·m/s - 0 = 20 kg·m/s.

Correct Answer: A — 20 kg·m/s

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Q. A 10 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?

A. 15 J
B. 30 J
C. 45 J
D. 60 J

Solution

Kinetic energy = 0.5 × m × v² = 0.5 × 10 kg × (3 m/s)² = 45 J.

Correct Answer: C — 45 J

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Q. A 10 kg object is moving with a velocity of 3 m/s. What is its momentum?

A. 10 kg·m/s
B. 30 kg·m/s
C. 3 kg·m/s
D. 0.3 kg·m/s

Solution

Momentum p = mv = 10 kg * 3 m/s = 30 kg·m/s.

Correct Answer: B — 30 kg·m/s

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Q. A 10 kg object is moving with a velocity of 3 m/s. What is the total mechanical energy if it is at a height of 5 m?

A. 150 J
B. 180 J
C. 300 J
D. 450 J

Solution

Total Mechanical Energy = Kinetic Energy + Potential Energy = 0.5 × 10 kg × (3 m/s)² + 10 kg × 9.8 m/s² × 5 m = 45 J + 490 J = 535 J.

Correct Answer: C — 300 J

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Q. A 10 kg object is moving with a velocity of 4 m/s. What is its kinetic energy?

A. 80 J
B. 40 J
C. 20 J
D. 160 J

Solution

Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 10 kg × (4 m/s)² = 80 J

Correct Answer: A — 80 J

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Q. A 10 kg object is moving with a velocity of 4 m/s. What is its momentum?

A. 40 kg m/s
B. 20 kg m/s
C. 10 kg m/s
D. 30 kg m/s

Solution

Momentum (p) = m * v = 10 kg * 4 m/s = 40 kg m/s

Correct Answer: A — 40 kg m/s

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Q. A 10 kg object is moving with a velocity of 4 m/s. What is its total mechanical energy if it is at a height of 5 m? (2020)

A. 120 J
B. 140 J
C. 100 J
D. 80 J

Solution

Total Mechanical Energy = Kinetic Energy + Potential Energy = (1/2 * 10 kg * (4 m/s)²) + (10 kg * 9.8 m/s² * 5 m) = 80 J + 490 J = 570 J

Correct Answer: B — 140 J

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Q. A 10 kg object is moving with a velocity of 5 m/s. What is its kinetic energy?

A. 125 J
B. 50 J
C. 100 J
D. 75 J

Solution

Kinetic energy KE = (1/2)mv² = (1/2)(10)(5²) = 125 J.

Correct Answer: A — 125 J

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Major Competitive Exams

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