Science MCQs (Physics):
Physics MCQs – Set 11
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Science MCQs (Physics) – Set 11
Level: Extreme Trap + High-Concept (Top Competitive Exams)
Best for SSC CGL, Railway JE, HP SET, NDA, State PCS
Physics MCQs – Set 11 (20 Questions with Explanation)
1. A particle moves in a circle with constant speed. Which quantity changes continuously?
A. Speed
B. Magnitude of velocity
C. Direction of velocity
D. Mass
✅ Answer: C
📘 Explanation: Velocity direction keeps changing, hence acceleration exists.
2. The ratio of SI unit of momentum to SI unit of force is:
A. Second
B. Meter
C. Newton
D. Dimensionless
✅ Answer: A
📘 Explanation:
Momentum / Force = (kg·m/s)/(kg·m/s²) = s
3. A body is thrown upward. At the highest point, which quantity is zero?
A. Acceleration
B. Velocity
C. Potential energy
D. Force
✅ Answer: B
📘 Explanation: Velocity becomes zero, acceleration = g downward.
4. If a wire is stretched without changing its volume, resistance becomes:
A. Proportional to length
B. Proportional to square of length
C. Inversely proportional to length
D. Constant
✅ Answer: B
📘 Explanation:
R = ρL²/V → R ∝ L².
5. Which physical quantity is conserved in both elastic and inelastic collisions?
A. Kinetic energy
B. Mechanical energy
C. Momentum
D. Velocity
✅ Answer: C
📘 Explanation: Momentum is always conserved.
6. The dimensional formula of Planck’s constant is:
A. [ML²T⁻¹]
B. [MLT⁻²]
C. [M²L²T⁻¹]
D. [ML²T⁻²]
✅ Answer: A
📘 Explanation:
h = Energy × Time.
7. A freely falling body covers distances in successive seconds in the ratio:
A. 1 : 2 : 3
B. 1 : 3 : 5
C. 1 : 4 : 9
D. 2 : 4 : 6
✅ Answer: B
📘 Explanation: Distance in nth second ∝ (2n − 1).
8. The escape velocity of Earth depends on:
A. Mass of object
B. Area of Earth
C. Radius and mass of Earth
D. Rotation of Earth
✅ Answer: C
📘 Explanation: vₑ = √(2GM/R).
9. Which of the following is NOT an electromagnetic wave?
A. X-rays
B. Radio waves
C. Sound waves
D. Gamma rays
✅ Answer: C
📘 Explanation: Sound waves are mechanical.
10. A transformer increases voltage. What happens to current?
A. Increases
B. Decreases
C. Remains same
D. Becomes zero
✅ Answer: B
📘 Explanation: Power conserved → higher V gives lower I.
11. The work done by friction on a moving object is generally:
A. Positive
B. Negative
C. Zero
D. Maximum
✅ Answer: B
📘 Explanation: Friction opposes motion.
12. Which law states that induced emf opposes the cause producing it?
A. Ohm’s law
B. Faraday’s law
C. Lenz’s law
D. Coulomb’s law
✅ Answer: C
📘 Explanation: Direction of induced current is given by Lenz’s law.
13. The unit of Young’s modulus is same as:
A. Force
B. Pressure
C. Energy
D. Power
✅ Answer: B
📘 Explanation: Young’s modulus = stress/strain.
14. If the frequency of a wave is doubled, its wavelength becomes:
A. Double
B. Half
C. Four times
D. Same
✅ Answer: B
📘 Explanation: λ = v/f → inversely proportional.
15. Which quantity determines the loudness of sound?
A. Frequency
B. Velocity
C. Amplitude
D. Wavelength
✅ Answer: C
📘 Explanation: Loudness ∝ amplitude.
16. A body floats in a liquid if:
A. Density of body > density of liquid
B. Density of body < density of liquid
C. Weight is zero
D. Shape is spherical
✅ Answer: B
📘 Explanation: Lower density → floating.
17. The heating effect of electric current depends on:
A. Current only
B. Voltage only
C. Resistance only
D. Current, resistance, and time
✅ Answer: D
📘 Explanation: H = I²Rt.
18. Which colour of light has maximum refractive index in glass?
A. Red
B. Yellow
C. Blue
D. Violet
✅ Answer: D
📘 Explanation: Higher frequency → higher refractive index.
19. The phenomenon responsible for blue colour of sky is:
A. Reflection
B. Refraction
C. Dispersion
D. Scattering
✅ Answer: D
📘 Explanation: Rayleigh scattering of shorter wavelengths.
20. A convex lens always forms a real image except when the object is:
A. Beyond 2F
B. At 2F
C. Between F and 2F
D. Between lens and F
✅ Answer: D
📘 Explanation: Object within focal length → virtual image.
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