Thermodynamics (Advanced) for Competitive Exam Success

Thermodynamics (Advanced)

Q. According to Newton's second law, what is the acceleration of a 2 kg object subjected to a net force of 10 N?

A. 5 m/s²
B. 2 m/s²
C. 10 m/s²
D. 20 m/s²

Solution

Using F = ma, acceleration a = F/m = 10 N / 2 kg = 5 m/s².

Correct Answer: A — 5 m/s²

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Q. If a 4 kg object is moving with a velocity of 2 m/s and collides elastically with a stationary object of mass 4 kg, what is the final velocity of the first object?

A. 0 m/s
B. 1 m/s
C. 2 m/s
D. 4 m/s

Solution

In an elastic collision, the velocities are exchanged. The first object comes to rest, so final velocity = 0 m/s.

Correct Answer: A — 0 m/s

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Q. If a car accelerates from rest to 20 m/s in 5 seconds, what is its average acceleration?

A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 1 m/s²

Solution

Average acceleration (a) = (final velocity - initial velocity) / time = (20 m/s - 0 m/s) / 5 s = 4 m/s².

Correct Answer: A — 2 m/s²

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Q. If an object is moving in a circular path with a constant speed, what type of acceleration does it experience?

A. Centripetal acceleration
B. Linear acceleration
C. No acceleration
D. Tangential acceleration

Solution

An object moving in a circular path experiences centripetal acceleration directed towards the center of the circle.

Correct Answer: A — Centripetal acceleration

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Q. In a frictionless environment, if a 4 kg object is pushed with a force of 16 N, what will be its acceleration?

A. 2 m/s²
B. 4 m/s²
C. 6 m/s²
D. 8 m/s²

Solution

Acceleration a = F/m = 16 N / 4 kg = 4 m/s².

Correct Answer: B — 4 m/s²

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Q. What is the angular momentum of a 2 kg object moving in a circle of radius 3 m at a speed of 4 m/s?

A. 24 kg·m²/s
B. 12 kg·m²/s
C. 6 kg·m²/s
D. 8 kg·m²/s

Solution

Angular momentum L = mvr = 2 kg × 4 m/s × 3 m = 24 kg·m²/s.

Correct Answer: A — 24 kg·m²/s

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Q. What is the potential energy of a 10 kg object at a height of 5 m?

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

Solution

Potential energy (PE) = m × g × h = 10 kg × 9.81 m/s² × 5 m = 490.5 J.

Correct Answer: B — 100 J

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Q. What is the total mechanical energy of a system if the potential energy is 30 J and the kinetic energy is 20 J?

A. 10 J
B. 50 J
C. 30 J
D. 20 J

Solution

Total mechanical energy = Potential energy + Kinetic energy = 30 J + 20 J = 50 J.

Correct Answer: B — 50 J

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Thermodynamics (Advanced)

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