Physics (School & Undergraduate)

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Physics (School & Undergraduate)

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Physics (School & Undergraduate) MCQ & Objective Questions

Physics is a fundamental subject that plays a crucial role in school and undergraduate exams. Mastering Physics concepts not only enhances your understanding of the universe but also significantly boosts your exam scores. Practicing MCQs and objective questions helps you identify important topics and improves your problem-solving skills, making it an essential part of your exam preparation.

What You Will Practise Here

Newton's Laws of Motion and their applications
Work, Energy, and Power concepts and formulas
Waves and Sound: Properties and equations
Optics: Reflection, refraction, and lens formulas
Thermodynamics: Laws and key definitions
Electromagnetism: Basics of electric fields and circuits
Modern Physics: Introduction to quantum mechanics and relativity

Exam Relevance

Physics is a significant part of the curriculum for CBSE, State Boards, NEET, and JEE exams. Questions often focus on conceptual understanding and application of formulas. Common patterns include numerical problems, theoretical questions, and diagram-based queries. Familiarizing yourself with these patterns through practice is vital for success in these competitive exams.

Common Mistakes Students Make

Misunderstanding the application of Newton's Laws in different scenarios
Confusing work done with energy concepts
Overlooking the importance of units and dimensions in calculations
Neglecting to draw diagrams for problems related to optics and mechanics
Failing to relate theoretical concepts to practical examples

FAQs

Question: What are some effective ways to prepare for Physics MCQs?
Answer: Regular practice of MCQs, understanding key concepts, and revising important formulas are effective strategies for preparation.

Question: How can I improve my problem-solving speed in Physics exams?
Answer: Practice timed quizzes and focus on solving a variety of problems to enhance your speed and accuracy.

Don't wait any longer! Start solving practice MCQs today to test your understanding and boost your confidence in Physics. Remember, consistent practice is the key to mastering important Physics (School & Undergraduate) questions for exams.

Electrostatics & Circuits Heat & Thermodynamics Mechanics Modern Physics Waves & Optics

Q. A flywheel is spinning with an angular velocity of 12 rad/s. If it experiences a constant angular deceleration of 3 rad/s², how long will it take to come to rest?

A. 2 s
B. 4 s
C. 6 s
D. 8 s

Solution

Using ω = ω₀ + αt, we set ω = 0, thus 0 = 12 rad/s - 3 rad/s² * t, giving t = 4 s.

Correct Answer: C — 6 s

Q. A force of 30 N is applied at an angle of 60 degrees to the horizontal. What is the horizontal component of the force?

A. 15 N
B. 30 N
C. 25 N
D. 20 N

Solution

Horizontal component = F cos(θ) = 30 N × cos(60°) = 30 N × 0.5 = 15 N.

Correct Answer: D — 20 N

Q. A machine does 200 J of work in 10 seconds. What is its power output?

A. 20 W
B. 30 W
C. 40 W
D. 50 W

Solution

Power = Work / Time = 200 J / 10 s = 20 W.

Correct Answer: A — 20 W

Q. A machine does 200 J of work in 5 seconds. What is its power output?

A. 20 W
B. 40 W
C. 50 W
D. 60 W

Solution

Power = Work / Time = 200 J / 5 s = 40 W.

Correct Answer: B — 40 W

Q. A person is running at 10 m/s on a moving walkway that moves at 2 m/s in the same direction. What is the person's speed relative to a stationary observer?

A. 8 m/s
B. 10 m/s
C. 12 m/s
D. 2 m/s

Solution

The person's speed relative to a stationary observer is the sum of their speeds: 10 m/s + 2 m/s = 12 m/s.

Correct Answer: C — 12 m/s

Q. A person walks at a speed of 4 km/h on a train moving at 60 km/h in the same direction. What is the person's speed relative to the ground?

A. 64 km/h
B. 56 km/h
C. 60 km/h
D. 4 km/h

Solution

The person's speed relative to the ground is the speed of the train plus the speed of the person: 60 km/h + 4 km/h = 64 km/h.

Correct Answer: A — 64 km/h

Q. A plane is flying at 250 km/h relative to the air, which is moving at 50 km/h against the direction of the plane. What is the plane's speed relative to the ground?

A. 200 km/h
B. 250 km/h
C. 300 km/h
D. 50 km/h

Solution

The plane's speed relative to the ground is 250 km/h - 50 km/h = 200 km/h.

Correct Answer: A — 200 km/h

Q. A rotating disk has an angular velocity of 10 rad/s. What is its angular momentum if its moment of inertia is 2 kg·m²?

A. 20 kg·m²/s
B. 10 kg·m²/s
C. 5 kg·m²/s
D. 15 kg·m²/s

Solution

Angular momentum L = Iω = 2 kg·m² × 10 rad/s = 20 kg·m²/s.

Correct Answer: A — 20 kg·m²/s

Q. A runner accelerates from rest to a speed of 10 m/s in 5 seconds. What is the total distance covered during this time?

A. 12.5 m
B. 25 m
C. 50 m
D. 100 m

Solution

Using the formula d = 0.5 * a * t², first find a = (v_f - v_i) / t = (10 - 0) / 5 = 2 m/s². Then, d = 0.5 * 2 * (5)² = 25 m.

Correct Answer: A — 12.5 m

Q. A runner completes a 400 m lap in 50 seconds. What is their average speed?

A. 6 m/s
B. 8 m/s
C. 10 m/s
D. 12 m/s

Solution

Average speed = total distance / total time = 400 m / 50 s = 8 m/s.

Correct Answer: B — 8 m/s

Q. A solid disk and a hollow cylinder of the same mass and radius roll down an incline. Which one reaches the bottom first?

A. Solid disk
B. Hollow cylinder
C. Both reach at the same time
D. Depends on the angle of incline

Solution

The solid disk has a lower moment of inertia than the hollow cylinder, allowing it to accelerate faster down the incline.

Correct Answer: A — Solid disk

Q. A sound source is moving away from an observer. If the source emits a sound of frequency 400 Hz, what frequency does the observer hear?

A. Less than 400 Hz
B. Exactly 400 Hz
C. More than 400 Hz
D. Infinity

Solution

As the source moves away, the frequency decreases, so the observer hears a frequency less than 400 Hz.

Correct Answer: A — Less than 400 Hz

Q. A stone is thrown horizontally from a height of 20 meters. How long does it take to hit the ground? (Assume g = 9.8 m/s²)

A. 1 s
B. 2 s
C. 3 s
D. 4 s

Solution

Using the formula t = √(2h/g), where h = 20 m and g = 9.8 m/s², we get t = √(2 * 20 / 9.8) ≈ 2.02 s.

Correct Answer: B — 2 s

Q. A stone is thrown straight up with a speed of 30 m/s. How long will it take to reach its highest point? (Assume g = 9.8 m/s²)

A. 1.5 s
B. 2 s
C. 3 s
D. 4 s

Solution

Time to reach the highest point is given by t = v/g, where v = 30 m/s and g = 9.8 m/s², so t = 30 / 9.8 ≈ 3.06 s.

Correct Answer: B — 2 s

Q. A swimmer can swim at 3 km/h in still water. If the current of the river is 2 km/h, what is the swimmer's speed relative to the bank when swimming upstream?

A. 1 km/h
B. 3 km/h
C. 5 km/h
D. 2 km/h

Solution

The swimmer's speed relative to the bank when swimming upstream is the swimmer's speed minus the current: 3 km/h - 2 km/h = 1 km/h.

Correct Answer: A — 1 km/h

Q. A torque of 10 N·m is applied to a wheel with a moment of inertia of 2 kg·m². What is the angular acceleration?

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

Solution

Using τ = Iα, we have α = τ/I = 10 N·m / 2 kg·m² = 5 rad/s².

Correct Answer: B — 5 rad/s²

Q. A train is moving at 90 km/h and a passenger inside walks towards the front of the train at 5 km/h. What is the passenger's speed relative to the ground?

A. 85 km/h
B. 90 km/h
C. 95 km/h
D. 5 km/h

Solution

The passenger's speed relative to the ground is the speed of the train plus the speed of the passenger: 90 km/h + 5 km/h = 95 km/h.

Correct Answer: C — 95 km/h

Q. A train is moving with a velocity of 80 m/s and comes to a stop in 10 seconds. What is the acceleration of the train?

A. -8 m/s²
B. -4 m/s²
C. 0 m/s²
D. 8 m/s²

Solution

Using the formula a = (v_f - v_i) / t, where v_f = 0 m/s, v_i = 80 m/s, and t = 10 s, we get a = (0 - 80) / 10 = -8 m/s².

Correct Answer: A — -8 m/s²

Q. A train moving at 72 km/h comes to a stop in 5 seconds. What is the train's deceleration?

A. 2 m/s²
B. 3 m/s²
C. 4 m/s²
D. 5 m/s²

Solution

First convert speed to m/s: 72 km/h = 20 m/s. Deceleration = (final velocity - initial velocity) / time = (0 - 20) / 5 = -4 m/s².

Correct Answer: C — 4 m/s²

Q. A vehicle travels 150 meters in 10 seconds. What is its average velocity?

A. 10 m/s
B. 15 m/s
C. 20 m/s
D. 25 m/s

Solution

Average velocity = total distance / total time = 150 m / 10 s = 15 m/s.

Correct Answer: B — 15 m/s

Q. A wheel rotates with an angular velocity of 10 rad/s. What is its angular momentum if its moment of inertia is 2 kg·m²?

A. 20 kg·m²/s
B. 10 kg·m²/s
C. 5 kg·m²/s
D. 15 kg·m²/s

Solution

Angular momentum L = Iω = 2 kg·m² × 10 rad/s = 20 kg·m²/s.

Correct Answer: A — 20 kg·m²/s

Q. A wheel rotates with an angular velocity of 4 rad/s. What is its angular momentum if its moment of inertia is 2 kg·m²?

A. 4 kg·m²/s
B. 8 kg·m²/s
C. 2 kg·m²/s
D. 16 kg·m²/s

Solution

Angular momentum L = Iω = 2 kg·m² * 4 rad/s = 8 kg·m²/s.

Correct Answer: B — 8 kg·m²/s

Q. According to Coulomb's law, what is the force between two charges of +3 µC and -2 µC separated by a distance of 0.1 m?

A. 0.54 N
B. 0.60 N
C. 0.72 N
D. 0.80 N

Solution

Force F = k * |q₁ * q₂| / r² = (8.99 x 10^9 N m²/C² * |3 x 10^-6 C * -2 x 10^-6 C|) / (0.1 m)² = 0.54 N.

Correct Answer: A — 0.54 N

Q. According to Faraday's law, the induced electromotive force (emf) in a closed loop is proportional to what?

A. The area of the loop
B. The rate of change of magnetic flux
C. The resistance of the loop
D. The current in the loop

Solution

Faraday's law states that the induced emf is proportional to the rate of change of magnetic flux through the loop.

Correct Answer: B — The rate of change of magnetic flux

Q. According to Kirchhoff's Voltage Law, the sum of the voltages around a closed loop is equal to what?

A. Zero
B. The total current
C. The total resistance
D. The total power

Solution

Kirchhoff's Voltage Law states that the sum of the voltages around a closed loop is equal to zero.

Correct Answer: A — Zero

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

Q. According to Newton's second law, what is the relationship between force, mass, and acceleration?

A. F = ma
B. F = m/a
C. F = a/m
D. F = m + a

Solution

Newton's second law states that force is equal to mass times acceleration (F = ma).

Correct Answer: A — F = ma

Q. According to Newton's third law, if you push against a wall with a force of 30 N, what is the force exerted by the wall on you?

A. 0 N
B. 15 N
C. 30 N
D. 45 N

Solution

According to Newton's third law, for every action, there is an equal and opposite reaction. Therefore, the wall exerts a force of 30 N back on you.

Correct Answer: C — 30 N

Q. According to Newton's third law, if you push against a wall, what does the wall do?

A. Pushes back with equal force
B. Does nothing
C. Falls down
D. Absorbs the force

Solution

Newton's third law states that for every action, there is an equal and opposite reaction.

Correct Answer: A — Pushes back with equal force

Q. According to Newton's third law, if you push against a wall, what happens?

A. The wall pushes back with equal force
B. The wall does not respond
C. You move backward
D. The wall collapses

Solution

Newton's third law states that for every action, there is an equal and opposite reaction.

Correct Answer: A — The wall pushes back with equal force

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