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. If an object is in free fall, what is the acceleration due to gravity near the Earth's surface?

A. 9.8 m/s²
B. 10 m/s²
C. 9.81 m/s²
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

Q. If an object is in free fall, what is the net force acting on it?

A. 0 N
B. Its weight
C. The normal force
D. Air resistance

Solution

In free fall, the only force acting on the object is its weight, which is the net force.

Correct Answer: B — Its weight

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

Q. If light travels from air (n=1) into water (n=1.33), what happens to its speed?

A. It increases
B. It decreases
C. It remains the same
D. It doubles

Solution

The speed of light decreases when it enters a medium with a higher refractive index.

Correct Answer: B — It decreases

Q. If the capacitance in an RC circuit is doubled, what happens to the time constant?

A. It remains the same.
B. It doubles.
C. It halves.
D. It quadruples.

Solution

Doubling the capacitance in an RC circuit will double the time constant τ = R * C.

Correct Answer: B — It doubles.

Q. If the capacitance of a capacitor is 3 µF and it is charged to 6 V, what is the charge on the capacitor?

A. 18 µC
B. 12 µC
C. 6 µC
D. 9 µC

Solution

Charge (Q) is given by Q = C * V. Here, Q = 3 µF * 6 V = 18 µC.

Correct Answer: A — 18 µC

Q. If the capacitance of a capacitor is doubled while the voltage remains constant, what happens to the charge stored?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

Charge (Q) stored in a capacitor is given by Q = C * V. If C is doubled and V remains constant, Q also doubles.

Correct Answer: A — It doubles

Q. If the capacitance of a capacitor is doubled, what happens to the charge stored if the voltage remains constant?

A. Charge is halved
B. Charge remains the same
C. Charge is doubled
D. Charge is quadrupled

Solution

Capacitance (C) is defined as C = Q/V. If C is doubled and V remains constant, Q must also double.

Correct Answer: C — Charge is doubled

Q. If the distance between two point charges is doubled, how does the force between them change according to Coulomb's law?

A. It doubles
B. It quadruples
C. It halves
D. It becomes one-fourth

Solution

According to Coulomb's law, the force F between two point charges is inversely proportional to the square of the distance r between them. If the distance is doubled, the force becomes F/4.

Correct Answer: D — It becomes one-fourth

Q. If the electric field between two parallel plates is 2000 N/C, what is the potential difference between the plates if they are 0.05 m apart?

A. 100 V
B. 200 V
C. 300 V
D. 400 V

Solution

Potential difference V = E * d = 2000 N/C * 0.05 m = 100 V.

Correct Answer: B — 200 V

Q. If the electric potential at a point is 100 V and the charge at that point is 2 µC, what is the electric potential energy?

A. 0.2 J
B. 0.1 J
C. 0.05 J
D. 0.4 J

Solution

Potential energy U = V * q = 100 V * 2 x 10^-6 C = 0.0002 J = 0.2 J.

Correct Answer: A — 0.2 J

Q. If the entropy of a system increases, what can be inferred about the system?

A. It is losing energy
B. It is becoming more ordered
C. It is becoming more disordered
D. It is in thermal equilibrium

Solution

An increase in entropy indicates that the system is becoming more disordered.

Correct Answer: C — It is becoming more disordered

Q. If the magnetic field strength is doubled, what happens to the induced emf in a loop moving through the field?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

If the magnetic field strength is doubled, the induced emf also doubles, as it is directly proportional to the magnetic field strength.

Correct Answer: A — It doubles

Q. If the magnetic field through a loop of wire is increasing, what is the direction of the induced current?

A. Clockwise
B. Counterclockwise
C. No current induced
D. Depends on the field strength

Solution

According to Lenz's law, the induced current will flow in a direction that opposes the change in magnetic flux. If the magnetic field is increasing, the induced current will be counterclockwise.

Correct Answer: B — Counterclockwise

Q. If the mass of a simple harmonic oscillator is tripled, how does the frequency change?

A. It triples
B. It is halved
C. It is reduced to one-third
D. It remains the same

Solution

The frequency f is inversely proportional to the square root of the mass m, so if m is tripled, the frequency is reduced to one-third.

Correct Answer: C — It is reduced to one-third

Q. If the potential difference across a capacitor is 12 V and its capacitance is 3 µF, what is the charge stored in the capacitor?

A. 36 µC
B. 24 µC
C. 12 µC
D. 18 µC

Solution

Q = C * V = 3 x 10^-6 F * 12 V = 36 µC.

Correct Answer: A — 36 µC

Q. If the potential difference across a capacitor is doubled, what happens to the stored energy?

A. It doubles
B. It quadruples
C. It remains the same
D. It halves

Solution

Energy stored in a capacitor is given by U = 1/2 C V^2. If V is doubled, U becomes 1/2 C (2V)^2 = 2CV^2, which is quadrupled.

Correct Answer: B — It quadruples

Q. If the radius of a circular path is doubled, how does the centripetal force change for a constant speed?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

Centripetal force F = mv²/r; if r is doubled, F is halved for constant speed.

Correct Answer: B — It halves

Q. If the radius of a circular path is doubled, how does the centripetal force change for a constant mass and velocity?

A. It doubles.
B. It halves.
C. It remains the same.
D. It quadruples.

Solution

Centripetal force is given by F = mv^2/r. If r is doubled, the force is halved, assuming mass and velocity remain constant.

Correct Answer: B — It halves.

Q. If the spring constant of a spring is doubled, how does the period of the simple harmonic motion change?

A. It doubles
B. It is halved
C. It remains the same
D. It quadruples

Solution

The period T is inversely proportional to the square root of the spring constant k. If k is doubled, the period is halved.

Correct Answer: B — It is halved

Q. If the temperature of a gas increases, what happens to its volume at constant pressure?

A. It decreases
B. It remains the same
C. It increases
D. It becomes zero

Solution

According to Charles's Law, if the temperature of a gas increases at constant pressure, its volume increases.

Correct Answer: C — It increases

Q. If the temperature of a gas increases, what happens to its volume if the pressure remains constant?

A. It decreases
B. It remains the same
C. It increases
D. It becomes zero

Solution

According to Charles's Law, if the pressure is constant, the volume of a gas increases as its temperature increases.

Correct Answer: C — It increases

Q. If the voltage across a resistor is doubled while the resistance remains constant, what happens to the current?

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

According to Ohm's Law, if voltage is doubled and resistance is constant, current will also double.

Correct Answer: A — It doubles

Q. If the volume of a gas is halved at constant temperature, what happens to the pressure?

A. It remains the same
B. It halves
C. It doubles
D. It quadruples

Solution

According to Boyle's law, pressure is inversely proportional to volume at constant temperature. If the volume is halved, the pressure doubles.

Correct Answer: C — It doubles

Q. If two capacitors are connected in series, how is the total capacitance (C_total) calculated?

A. 1/C_total = 1/C1 + 1/C2
B. C_total = C1 + C2
C. C_total = C1 * C2
D. C_total = C1 - C2

Solution

For capacitors in series, the total capacitance is given by 1/C_total = 1/C1 + 1/C2.

Correct Answer: A — 1/C_total = 1/C1 + 1/C2

Q. If two capacitors of 4 µF and 6 µF are connected in parallel, what is the total capacitance?

A. 10 µF
B. 24 µF
C. 2.4 µF
D. 12 µF

Solution

C_eq = C1 + C2 = 4 µF + 6 µF = 10 µF.

Correct Answer: A — 10 µF

Q. If two capacitors of 4 µF and 6 µF are connected in series, what is the total capacitance?

A. 2.4 µF
B. 10 µF
C. 1.5 µF
D. 24 µF

Solution

1/C_total = 1/C1 + 1/C2 = 1/4 + 1/6 = 5/12, thus C_total = 12/5 = 2.4 µF.

Correct Answer: A — 2.4 µF

Q. If two capacitors of capacitance C1 and C2 are connected in series, what is the equivalent capacitance (Ceq)?

A. Ceq = C1 + C2
B. Ceq = 1 / (1/C1 + 1/C2)
C. Ceq = C1 * C2
D. Ceq = (C1 * C2) / (C1 + C2)

Solution

The equivalent capacitance for capacitors in series is given by Ceq = 1 / (1/C1 + 1/C2).

Correct Answer: B — Ceq = 1 / (1/C1 + 1/C2)

Q. If two charges of +3 µC and -3 µC are placed 0.2 m apart, what is the magnitude of the force between them?

A. 67.5 N
B. 45 N
C. 30 N
D. 15 N

Solution

Using Coulomb's law, F = k * |q1 * q2| / r^2 = (8.99 x 10^9 N m²/C²) * |3 x 10^-6 C * -3 x 10^-6 C| / (0.2 m)^2 = 45 N.

Correct Answer: B — 45 N

Q. If two particles of masses m1 and m2 are moving towards each other with velocities v1 and v2, what is the total momentum of the system before they collide?

A. m1 * v1 + m2 * v2
B. m1 * v1 - m2 * v2
C. m1 * v1 + m2 * v2 + m1 * m2
D. 0

Solution

The total momentum of the system before the collision is the vector sum of the momenta of the two particles, which is m1 * v1 + m2 * v2.

Correct Answer: A — m1 * v1 + m2 * v2

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