Physics MCQs

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Physics MCQs

Practice the latest Physics MCQs with answers and detailed explanations. This section includes chapter-wise multiple-choice questions covering mechanics, motion, force, work and energy, heat, light, electricity, magnetism, modern physics, waves, optics, and other important topics. These exam-oriented MCQs are ideal for Class 9–12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Total Questions

Practice Questions

Page 63 of 65
Question #1241
The mechanical advantage of a lever is given by
A. Effort/Load
B. Load/Effort
C. Load × Effort
D. Load arm/Effort arm
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Correct Answer: Option B

Explanation:
MA = Load / Effort. For ideal, also = Effort arm / Load arm.
This question belongs to: Science Physics
Question #1242
A pulley system has 4 pulleys. Its velocity ratio (number of supporting ropes) is
A. 2
B. 8
C. 4
D. 1
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Correct Answer: Option C

Explanation:
For ideal block and tackle with n movable pulleys, VR = n = 4.
This question belongs to: Science Physics
Question #1243
The efficiency of a machine is 80%. If it lifts a load of 500 N through 2 m, effort applied through 10 m. Effort is
A. 200 N
B. 125 N
C. 100 N
D. 80 N
Discuss
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Correct Answer: Option B

Explanation:
Work output = 500×2=1000 J. Work input = output/eff = 1000/0.8=1250 J. Effort = Work input / distance = 1250/10 = 125 N.
This question belongs to: Science Physics
Question #1244
The frequency of a wave is 1 kHz. Its time period is
A. 1000 s
B. 0.001 s
C. 1 s
D. 0.01 s
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Correct Answer: Option B

Explanation:
T = 1/f = 1/1000 = 0.001 s = 1 ms.
This question belongs to: Science Physics
Question #1245
A sound wave has wavelength 1.7 m and speed 340 m/s. Its frequency is
A. 170 Hz
B. 340 Hz
C. 578 Hz
D. 200 Hz
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Correct Answer: Option D

Explanation:
f = v/λ = 340/1.7 = 200 Hz.
This question belongs to: Science Physics
Question #1246
The frequency of ultrasonic wave is
A. > 20 MHz
B. 20 Hz - 20 kHz
C. > 20 kHz
D. < 20 Hz
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Correct Answer: Option C

Explanation:
Above 20 kHz.
This question belongs to: Science Physics
Question #1247
SONAR works on the principle of
A. Refraction of sound
B. Interference of sound
C. Reflection of sound
D. Doppler effect
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Correct Answer: Option C

Explanation:
Sound Navigation And Ranging uses echo (reflection).
This question belongs to: Science Physics
Question #1248
The audible range of sound for human beings is
A. 0 - 100 Hz
B. 20 Hz - 20,000 Hz
C. 200 Hz - 2000 Hz
D. 20 kHz - 200 kHz
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Correct Answer: Option B

Explanation:
Standard audible range.
This question belongs to: Science Physics
Question #1249
The speed of sound in air at 0°C is 331 m/s. At 22°C, approximately
A. 350 m/s
B. 331 m/s
C. 360 m/s
D. 343 m/s
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Correct Answer: Option D

Explanation:
v ≈ 331 + 0.6×T(°C) = 331 + 0.6×22 = 331+13.2 = 344.2 m/s, nearest 343 m/s.
This question belongs to: Science Physics
Question #1250
The phenomenon of persistence of sound due to multiple reflections is called
A. Resonance
B. Echo
C. Reverberation
D. Doppler effect
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Correct Answer: Option C

Explanation:
Reverberation is prolongation of sound due to reflections blending. Echo is distinct repetition.
This question belongs to: Science Physics
Question #1251
A wave in which particles vibrate perpendicular to direction of propagation is
A. Transverse
B. Longitudinal
C. Both A and C
D. Sound wave in air
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Correct Answer: Option A

Explanation:
Transverse: e.g., light, waves on string. Sound in air longitudinal.
This question belongs to: Science Physics
Question #1252
The time period of a mass-spring system depends on
A. Gravity
B. Spring constant only
C. Both mass and spring constant
D. Mass only
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Correct Answer: Option C

Explanation:
T = 2π√(m/k). Depends on mass and stiffness.
This question belongs to: Science Physics
Question #1253
A simple pendulum of length L has period T. If length is increased by 4 times, new period is
A. T/4
B. 4T
C. T/2
D. 2T
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Correct Answer: Option D

Explanation:
T ∝ √L, so √4 = 2 times.
This question belongs to: Science Physics
Question #1254
A body executing SHM has amplitude 5 cm and time period 2 s. Maximum velocity is
A. 10π cm/s
B. 20π cm/s
C. 2.5π cm/s
D. 5π cm/s
Discuss
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Correct Answer: Option D

Explanation:
v_max = ωA = (2π/T) A = (2π/2)×5 = 5π cm/s.
This question belongs to: Science Physics
Question #1255
The energy of SHM when particle is at mean position is
A. All potential
B. Half KE half PE
C. All kinetic
D. Zero
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Correct Answer: Option C

Explanation:
At mean position, velocity maximum, displacement zero, all energy is kinetic.
This question belongs to: Science Physics
Question #1256
The wavelength of a wave is the distance between two consecutive
A. Crests
B. Crest and trough
C. Both B and C
D. Troughs
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Correct Answer: Option C

Explanation:
Wavelength is distance between successive crests or successive troughs.
This question belongs to: Science Physics
Question #1257
A wave of frequency 60 Hz has period
A. 0.0167 s
B. 0.6 s
C. 60 s
D. 1/60 s
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Correct Answer: Option D

Explanation:
T = 1/60 s.
This question belongs to: Science Physics
Question #1258
The device used to measure very high temperatures (e.g., furnace) is
A. Thermometer
B. Bolometer
C. Pyrometer
D. Thermocouple
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Correct Answer: Option C

Explanation:
Pyrometer measures high temperatures by radiation without contact.
This question belongs to: Science Physics
Question #1259
The instrument used to measure intensity of earthquakes is
A. Hygrometer
B. Barometer
C. Seismograph
D. Richter scale
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Correct Answer: Option C

Explanation:
Seismograph records seismic waves. Richter scale quantifies magnitude.
This question belongs to: Science Physics
Question #1260
The instrument that measures the density of a liquid is
A. Hydrometer
B. Barometer
C. Hygrometer
D. Lactometer
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Correct Answer: Option A

Explanation:
Hydrometer measures relative density. Lactometer for milk, but general is hydrometer.
This question belongs to: Science Physics

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