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.
Q. What is the electric potential energy of a system of two charges, +1 µC and -1 µC, separated by 0.1 m?
A.
-0.09 J
B.
0.09 J
C.
0.18 J
D.
0.36 J
Show solution
Solution
Potential energy U = k * q1 * q2 / r = (8.99 x 10^9 N m²/C²) * (1 x 10^-6 C) * (-1 x 10^-6 C) / 0.1 m = -0.09 J.
Correct Answer:
A
— -0.09 J
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Q. What is the electric potential energy stored in a capacitor of 2 µF charged to 12 V?
A.
0.144 mJ
B.
0.288 mJ
C.
0.576 mJ
D.
0.072 mJ
Show solution
Solution
U = 1/2 * C * V² = 1/2 * 2 x 10^-6 F * (12 V)² = 0.144 mJ.
Correct Answer:
B
— 0.288 mJ
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Q. What is the electric potential energy stored in a capacitor of capacitance 2 µF charged to 12 V?
A.
0.144 mJ
B.
0.024 mJ
C.
0.288 mJ
D.
0.072 mJ
Show solution
Solution
Electric potential energy (U) is given by U = 1/2 CV^2. Here, U = 1/2 * 2 µF * (12 V)^2 = 0.144 mJ.
Correct Answer:
A
— 0.144 mJ
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Q. What is the electric potential energy stored in a capacitor with a capacitance of 2 µF charged to 12 V?
A.
0.144 mJ
B.
0.12 mJ
C.
0.24 mJ
D.
0.06 mJ
Show solution
Solution
Electric potential energy (U) is given by U = 1/2 C V^2. Here, U = 1/2 * 2 µF * (12 V)^2 = 0.144 mJ.
Correct Answer:
A
— 0.144 mJ
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Q. What is the energy of a photon related to?
A.
Its mass.
B.
Its frequency.
C.
Its speed.
D.
Its temperature.
Show solution
Solution
The energy of a photon is directly proportional to its frequency, as described by the equation E = hf, where E is energy, h is Planck's constant, and f is frequency.
Correct Answer:
B
— Its frequency.
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Q. What is the energy stored in a capacitor of 20 µF charged to 10 V?
A.
0.1 J
B.
0.2 J
C.
0.05 J
D.
0.15 J
Show solution
Solution
Energy U = 0.5 * C * V² = 0.5 * 20 x 10^-6 F * (10 V)² = 0.1 J.
Correct Answer:
B
— 0.2 J
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Q. What is the energy stored in a capacitor of 20 µF charged to 12 V?
A.
1.44 mJ
B.
0.12 mJ
C.
0.24 mJ
D.
0.48 mJ
Show solution
Solution
Energy stored, U = 0.5 * C * V^2 = 0.5 * (20 x 10^-6 F) * (12 V)^2 = 1.44 mJ.
Correct Answer:
A
— 1.44 mJ
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Q. What is the energy stored in a capacitor of 4 µF charged to a voltage of 12 V?
A.
0.288 mJ
B.
0.576 mJ
C.
0.144 mJ
D.
0.072 mJ
Show solution
Solution
Using the formula U = 1/2 * C * V^2 = 1/2 * 4 x 10^-6 F * (12 V)^2 = 0.288 mJ.
Correct Answer:
B
— 0.576 mJ
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Q. What is the energy stored in a capacitor of 5 µF charged to 12V?
A.
0.36 mJ
B.
0.72 mJ
C.
0.12 mJ
D.
0.24 mJ
Show solution
Solution
Energy U = 1/2 * C * V^2 = 1/2 * 5 x 10^-6 F * (12V)^2 = 0.36 mJ.
Correct Answer:
A
— 0.36 mJ
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Q. What is the energy stored in a capacitor of 5 µF charged to a voltage of 10 V?
A.
0.25 mJ
B.
0.5 mJ
C.
0.75 mJ
D.
1 mJ
Show solution
Solution
Energy (U) = 0.5 * C * V² = 0.5 * 5 x 10^-6 F * (10 V)² = 0.25 mJ.
Correct Answer:
A
— 0.25 mJ
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Q. What is the energy stored in a capacitor of 5 µF charged to a voltage of 12 V?
A.
0.36 mJ
B.
0.60 mJ
C.
0.72 mJ
D.
0.84 mJ
Show solution
Solution
Energy stored U = 0.5 * C * V² = 0.5 * 5 x 10^-6 F * (12 V)² = 0.36 mJ.
Correct Answer:
C
— 0.72 mJ
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Q. What is the energy stored in a capacitor of 5µF charged to a voltage of 10V?
A.
0.25 mJ
B.
0.5 mJ
C.
1 mJ
D.
2.5 mJ
Show solution
Solution
Energy (U) = 0.5 * C * V² = 0.5 * 5 x 10^-6 F * (10V)² = 0.25 mJ.
Correct Answer:
B
— 0.5 mJ
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Q. What is the energy stored in a capacitor of capacitance 5 µF charged to 10 V?
A.
0.25 mJ
B.
0.5 mJ
C.
0.75 mJ
D.
1 mJ
Show solution
Solution
Energy (U) is given by U = 1/2 CV^2. Here, U = 1/2 * 5 µF * (10 V)^2 = 0.5 mJ.
Correct Answer:
B
— 0.5 mJ
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Q. What is the entropy change when 1 kg of water at 100°C is converted to steam at 100°C?
A.
2260 J/K
B.
100 J/K
C.
540 J/K
D.
0 J/K
Show solution
Solution
The entropy change for phase change at constant temperature is ΔS = Q/T. For 1 kg of water to steam, Q = 2260 kJ, T = 373 K, so ΔS = 2260 kJ / 373 K = 6.06 kJ/K.
Correct Answer:
A
— 2260 J/K
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Q. What is the entropy change when 1 mole of an ideal gas expands isothermally and reversibly from volume V1 to V2?
A.
R ln(V2/V1)
B.
R (V2 - V1)
C.
0
D.
R ln(V1/V2)
Show solution
Solution
The entropy change for an isothermal and reversible expansion is given by ΔS = R ln(V2/V1).
Correct Answer:
A
— R ln(V2/V1)
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Q. What is the entropy change when 1 mole of an ideal gas expands isothermally from volume V1 to V2?
A.
R ln(V2/V1)
B.
R (V2 - V1)
C.
R (V1/V2)
D.
0
Show solution
Solution
The entropy change for an isothermal expansion of an ideal gas is given by ΔS = nR ln(V2/V1). For 1 mole, it simplifies to ΔS = R ln(V2/V1).
Correct Answer:
A
— R ln(V2/V1)
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Q. What is the equivalent capacitance of two capacitors (3 µF and 6 µF) in series?
A.
2 µF
B.
1.5 µF
C.
9 µF
D.
18 µF
Show solution
Solution
1/Ceq = 1/C1 + 1/C2 = 1/3 + 1/6 = 1/2. Therefore, Ceq = 2 µF.
Correct Answer:
B
— 1.5 µF
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Q. What is the equivalent capacitance of two capacitors of 4 µF and 6 µF connected in series?
A.
2.4 µF
B.
10 µF
C.
1.5 µF
D.
3.6 µF
Show solution
Solution
1/C_total = 1/C1 + 1/C2 = 1/4 µF + 1/6 µF = 1.2 µF, so C_total = 2.4 µF.
Correct Answer:
A
— 2.4 µF
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Q. What is the equivalent capacitance of two capacitors, 2 µF and 3 µF, connected in series?
A.
1.2 µF
B.
5 µF
C.
0.6 µF
D.
6 µF
Show solution
Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/2 + 1/3 = 5/6. Therefore, C_eq = 6/5 = 1.2 µF.
Correct Answer:
A
— 1.2 µF
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Q. What is the equivalent capacitance of two capacitors, 3 µF and 6 µF, connected in series?
A.
2 µF
B.
1 µF
C.
9 µF
D.
4 µF
Show solution
Solution
1/C_eq = 1/C1 + 1/C2 = 1/3 + 1/6 = 1/2. Therefore, C_eq = 2 µF.
Correct Answer:
A
— 2 µF
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Q. What is the equivalent capacitance of two capacitors, 4 µF and 6 µF, connected in series?
A.
2.4 µF
B.
10 µF
C.
1.5 µF
D.
3.6 µF
Show solution
Solution
1/C_eq = 1/C1 + 1/C2 = 1/4 + 1/6 => C_eq = 2.4 µF.
Correct Answer:
A
— 2.4 µF
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Q. What is the equivalent capacitance of two capacitors, 4 µF and 6 µF, in series?
A.
2.4 µF
B.
10 µF
C.
1.5 µF
D.
3.6 µF
Show solution
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
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Q. What is the equivalent capacitance of two capacitors, C1 = 4μF and C2 = 6μF, connected in series?
A.
2.4μF
B.
3.6μF
C.
10μF
D.
24μF
Show solution
Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2 => C_eq = 2.4μF.
Correct Answer:
A
— 2.4μF
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Q. What is the equivalent resistance (R_eq) of two resistors (R1 and R2) in series?
A.
R_eq = R1 + R2
B.
R_eq = R1 * R2
C.
R_eq = R1 / R2
D.
R_eq = R1 - R2
Show solution
Solution
The equivalent resistance of two resistors in series is R_eq = R1 + R2.
Correct Answer:
A
— R_eq = R1 + R2
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Q. What is the equivalent resistance (R_eq) of two resistors R1 and R2 in parallel?
A.
1/R_eq = 1/R1 + 1/R2
B.
R_eq = R1 + R2
C.
R_eq = R1 * R2
D.
R_eq = R1 - R2
Show solution
Solution
For resistors in parallel, the equivalent resistance is given by 1/R_eq = 1/R1 + 1/R2.
Correct Answer:
A
— 1/R_eq = 1/R1 + 1/R2
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Q. What is the equivalent resistance of three 4 Ω resistors in series?
A.
12 Ω
B.
8 Ω
C.
16 Ω
D.
4 Ω
Show solution
Solution
R_eq = R1 + R2 + R3 = 4 Ω + 4 Ω + 4 Ω = 12 Ω.
Correct Answer:
A
— 12 Ω
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Q. What is the equivalent resistance of three resistors of 2 Ω, 3 Ω, and 5 Ω connected in series?
A.
10 Ω
B.
5 Ω
C.
8 Ω
D.
12 Ω
Show solution
Solution
R_total = R1 + R2 + R3 = 2 Ω + 3 Ω + 5 Ω = 10 Ω.
Correct Answer:
A
— 10 Ω
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Q. What is the equivalent resistance of three resistors of 2 Ω, 3 Ω, and 5 Ω in series?
A.
10 Ω
B.
8 Ω
C.
5 Ω
D.
3 Ω
Show solution
Solution
R_eq = R1 + R2 + R3 = 2 Ω + 3 Ω + 5 Ω = 10 Ω.
Correct Answer:
A
— 10 Ω
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Q. What is the equivalent resistance of three resistors of 2 Ω, 3 Ω, and 6 Ω in series?
A.
11 Ω
B.
10 Ω
C.
9 Ω
D.
8 Ω
Show solution
Solution
R_eq = R1 + R2 + R3 = 2 Ω + 3 Ω + 6 Ω = 11 Ω.
Correct Answer:
A
— 11 Ω
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Q. What is the equivalent resistance of three resistors of 4 ohms, 6 ohms, and 12 ohms connected in series?
A.
22 ohms
B.
12 ohms
C.
10 ohms
D.
8 ohms
Show solution
Solution
In series, R_eq = R1 + R2 + R3 = 4Ω + 6Ω + 12Ω = 22Ω.
Correct Answer:
A
— 22 ohms
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