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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Page 58 of 65
Question #1141
A wave of frequency 500 Hz has speed 350 m/s. Wavelength is
A. 0.7 m
B. 1.43 m
C. 175 m
D. 70 m
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Correct Answer: Option A

Explanation:
λ = v/f = 350/500 = 0.7 m.
This question belongs to: Science Physics
Question #1142
In a longitudinal wave, the distance between two consecutive compressions is called
A. Frequency
B. Rarefaction
C. Wavelength
D. Amplitude
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Correct Answer: Option C

Explanation:
Wavelength is distance between successive compressions or rarefactions.
This question belongs to: Science Physics
Question #1143
Which instrument records seismic waves?
A. Barograph
B. Oscilloscope
C. Seismograph
D. Hydrometer
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Correct Answer: Option C

Explanation:
Seismograph detects and records earthquake waves.
This question belongs to: Science Physics
Question #1144
Microwave oven heats food by
A. Conduction
B. Infrared radiation
C. Agitating water molecules
D. Convection
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Correct Answer: Option C

Explanation:
Microwaves cause polar water molecules to rotate, generating heat through molecular friction (dielectric heating).
This question belongs to: Science Physics
Question #1145
The working of a refrigerator is based on
A. Heating effect of current
B. Evaporation and condensation of refrigerant
C. Magnetic effect
D. Photoelectric effect
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Correct Answer: Option B

Explanation:
Refrigerant evaporates inside absorbing heat, compressed outside releasing heat, cycle repeats.
This question belongs to: Science Physics
Question #1146
A fuse wire is connected in which wire?
A. Live
B. Any
C. Neutral
D. Earth
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Correct Answer: Option A

Explanation:
Fuse must be in live (phase) wire so that appliance is isolated when fuse blows.
This question belongs to: Science Physics
Question #1147
Pressure cooker cooks food faster because
A. Temperature is low
B. Low pressure raises boiling point
C. High pressure raises boiling point
D. High pressure lowers boiling point
Discuss
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Correct Answer: Option C

Explanation:
Higher pressure inside increases boiling point, food cooks at higher temperature.
This question belongs to: Science Physics
Question #1148
Who proposed the theory of relativity?
A. Einstein
B. Newton
C. Maxwell
D. Galileo
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Correct Answer: Option A

Explanation:
Albert Einstein proposed special relativity (1905) and general relativity (1915).
This question belongs to: Science Physics
Question #1149
C.V. Raman was awarded Nobel Prize for his work on
A. X-rays
B. Raman effect
C. Photoelectric effect
D. Nuclear fission
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Correct Answer: Option B

Explanation:
Raman effect: inelastic scattering of light, 1928, Nobel 1930.
This question belongs to: Science Physics
Question #1150
The planet with the shortest day is
A. Earth
B. Mercury
C. Jupiter
D. Venus
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Correct Answer: Option C

Explanation:
Jupiter rotates fastest, day ~9.9 hours. Mercury's day is long. This is general knowledge but physics related. If out of syllabus, I can skip. But syllabus doesn't mention planets. I'll stay within syllabus. Better to replace with a scientist question. Replace with: Who invented the electric bulb? Edison. I'll change to: The electric bulb was invented by Thomas Edison. So new question:
This question belongs to: Science Physics
Question #1151
The electric bulb was invented by
A. Michael Faraday
B. Nikola Tesla
C. James Watt
D. Thomas Edison
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Correct Answer: Option D

Explanation:
Thomas Alva Edison invented the practical incandescent light bulb in 1879.
This question belongs to: Science Physics
Question #1152
Which scientist formulated the laws of electromagnetic induction?
A. Maxwell
B. Ampere
C. Oersted
D. Faraday
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Correct Answer: Option D

Explanation:
Michael Faraday discovered electromagnetic induction (1831). Oersted found magnetic effect of current.
This question belongs to: Science Physics
Question #1153
The gravitational constant G was first measured by
A. Kepler
B. Cavendish
C. Galileo
D. Newton
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Correct Answer: Option B

Explanation:
Henry Cavendish used torsion balance to determine G.
This question belongs to: Science Physics
Question #1154
The nucleus of an atom was discovered by
A. J.J. Thomson
B. Bohr
C. Rutherford
D. Chadwick
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Correct Answer: Option C

Explanation:
Rutherford's gold foil experiment (1911) revealed the nucleus. Thomson discovered electron.
This question belongs to: Science Physics
Question #1155
Assertion (A): In a free fall, a heavy object falls faster than a light object. Reason (R): Acceleration due to gravity is same for all objects.
A. Both A and R true, R is correct explanation
B. Both A and R true, R not correct explanation
C. A is true, R is false
D. A is false, R is true
Discuss
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Correct Answer: Option D

Explanation:
In vacuum, all objects fall at same rate. A is false. R is true. So C correct.
This question belongs to: Science Physics
Question #1156
Assertion (A): Fuse wire has high resistance and low melting point. Reason (R): It must melt to break circuit on overload.
A. Both A and R true, R not correct explanation
B. A false, R true
C. A true, R false
D. Both A and R true, R correct explanation
Discuss
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Correct Answer: Option D

Explanation:
High resistance produces more heat (I²R), low melting point ensures quick melting. Both true and R explains A.
This question belongs to: Science Physics
Question #1157
Assertion (A): A convex mirror is used as a rear-view mirror. Reason (R): It gives a wider field of view.
A. Both A and R true, R correct explanation
B. A true, R false
C. A false, R true
D. Both A and R true, R not correct explanation
Discuss
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Correct Answer: Option A

Explanation:
Convex mirror provides wider field and erect image, so R explains A correctly.
This question belongs to: Science Physics
Question #1158
The work done by a centripetal force in half revolution is
A. πrF
B. mv²
C. 2F r
D. Zero
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Correct Answer: Option D

Explanation:
Centripetal force always perpendicular to displacement, work zero.
This question belongs to: Science Physics
Question #1159
A 2 kg mass moving at 4 m/s collides elastically with a stationary 2 kg mass. After collision, first mass
A. Rebounds with 4 m/s
B. Stops
C. Moves with 2 m/s
D. Moves with 1 m/s
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Correct Answer: Option B

Explanation:
Equal masses elastic collision: velocities swap. Moving mass stops, stationary moves with 4 m/s.
This question belongs to: Science Physics
Question #1160
A gun recoils on firing because of
A. Newton's third law
B. Conservation of mass
C. Conservation of energy
D. Law of inertia
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Correct Answer: Option A

Explanation:
Action (bullet forward) and reaction (gun backward). Also momentum conservation.
This question belongs to: Science Physics

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