Chapters and topics
- Gravitational Fields 2 topics · 205 MCQs
- Kinetic Theory of Gases 1 topic · 106 MCQs
- Oscillations 1 topic · 162 MCQs
- Interference and Diffraction 1 topic · 114 MCQs
- Electric Potential and Capacitance 2 topics · 217 MCQs
- Alternating Current 1 topic · 153 MCQs
- Quantum Physics 1 topic · 143 MCQs
- Nuclear Physics 1 topic · 135 MCQs
- Astrophysics and Climate Physics 1 topic · 151 MCQs
Sample Physics MCQs
Try these questions, then open the full practice to work through every chapter. Tap “Show the answer” after you choose.
Q1. The height of a geostationary orbit above the Earth's surface is about:
- 384 000 km
- 36 000 km
- 6400 km
- 400 km
Show the answer
Answer: B. 36 000 km
The correct answer is “36 000 km”. Radius ≈ 42 300 km.
Q2. If the absolute temperature of a gas is increased 16 times, the average kinetic energy of its molecules becomes:
- 256 times
- 4 times
- 16 times
- unchanged
Show the answer
Answer: C. 16 times
The correct answer is “16 times”. ⟨Eₖ⟩ ∝ T.
Q3. In a lightly damped system, the amplitude decreases:
- then increases
- not at all
- linearly to zero at once
- exponentially with time
Show the answer
Answer: D. exponentially with time
The correct answer is “exponentially with time”. Gradual decay.
Q4. In a double-slit experiment, λ = 600 nm, the screen is 3.0 m away and the slit separation is 0.1 mm. The fringe spacing is:
- 18000 mm
- 2 × 10⁻⁸ mm
- 36 mm
- 18 mm
Show the answer
Answer: D. 18 mm
y = λL/d = 6 × 10⁻⁷ × 3.0 / 1 × 10⁻⁴ = 18 mm.
Q5. A capacitor stores 5 × 10⁻⁶ C when charged to 12 V. Its capacitance is:
- 4.17 × 10⁻⁷ F
- 8.33 × 10⁻⁷ F
- 2.4 × 10⁶ F
- 6 × 10⁻⁵ F
Show the answer
Answer: A. 4.17 × 10⁻⁷ F
The correct answer is “4.17 × 10⁻⁷ F”. C = Q/V = 4.17 × 10⁻⁷ F.
Q6. In a purely capacitive AC circuit, the current:
- is zero
- lags the voltage by 90°
- leads the voltage by 90°
- is in phase
Show the answer
Answer: C. leads the voltage by 90°
The correct answer is “leads the voltage by 90°”. ICE.
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