Physics MCQs

Science

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.

1287
Total Questions

Practice Questions

Page 57 of 65
Question #1121
A body at 100°C is placed in contact with a body at 0°C. Heat flow stops when
A. Thermal equilibrium is reached
B. Both reach 0°C
C. Both reach 100°C
D. Heat content becomes equal
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Heat flows until temperatures equal, i.e., thermal equilibrium. Not necessarily 50°C unless heat capacities equal.
This question belongs to: Science Physics
Question #1122
The frequency of a tuning fork is 512 Hz. It produces resonance in a closed organ pipe of length 16 cm (speed of sound 340 m/s). The pipe resonates in
A. End correction needed
B. Fundamental mode
C. Second overtone
D. First overtone
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
For closed pipe, fundamental f = v/(4L) = 340/(4×0.16) = 340/0.64 ≈ 531 Hz, close to 512 Hz, slight difference due to end correction. So fundamental. Approx match, SSC type.
This question belongs to: Science Physics
Question #1123
An echo is heard from a cliff after 3 s. If speed of sound is 340 m/s, distance of cliff is
A. 1020 m
B. 510 m
C. 170 m
D. 340 m
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
d = v × t / 2 = 340 × 3 / 2 = 510 m.
This question belongs to: Science Physics
Question #1124
The phenomenon of increase in frequency when source of sound approaches observer is called
A. Resonance
B. Reverberation
C. Doppler effect
D. Echo
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Doppler effect: apparent frequency change due to relative motion. Approaching increases frequency.
This question belongs to: Science Physics
Question #1125
Ultrasonic waves have frequency
A. 20 Hz to 20 kHz
B. Less than 20 Hz
C. Greater than 20 kHz
D. Greater than 20 MHz
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Above 20 kHz is ultrasound.
This question belongs to: Science Physics
Question #1126
A convex lens forms a real and inverted image of same size when object is at
A. F
B. Infinity
C. Between F and 2F
D. 2F
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
At 2F, image at 2F, same size, real inverted.
This question belongs to: Science Physics
Question #1127
The human eye lens is
A. Convex with variable focal length
B. Convex of fixed focal length
C. Concave
D. Plano-convex
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Eye lens is convex, focal length changed by ciliary muscles (accommodation).
This question belongs to: Science Physics
Question #1128
Myopia is corrected by
A. Concave lens
B. Cylindrical lens
C. Convex lens
D. Bifocal lens
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Myopia (nearsightedness) requires diverging lens (concave). Hypermetropia needs convex.
This question belongs to: Science Physics
Question #1129
The splitting of white light into its constituent colors by a prism is due to
A. Scattering
B. Dispersion
C. Total internal reflection
D. Reflection
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Dispersion: different wavelengths refract at different angles because refractive index varies with wavelength.
This question belongs to: Science Physics
Question #1130
Two resistors of 6 Ω and 3 Ω are connected in parallel. Equivalent resistance is
A. 1 Ω
B. 2 Ω
C. 3 Ω
D. 9 Ω
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Parallel: (6×3)/(6+3) = 18/9 = 2 Ω.
This question belongs to: Science Physics
Question #1131
A 100 W, 200 V bulb is connected to a 100 V supply. Power consumed is
A. 50 W
B. 25 W
C. 100 W
D. 200 W
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
R = V²/P = 40000/100 = 400 Ω. At 100 V, P = V²/R = 10000/400 = 25 W.
This question belongs to: Science Physics
Question #1132
A fuse wire has
A. High melting point, low resistance
B. Low melting point, low resistance
C. Low melting point, high resistance
D. High melting point, high resistance
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Fuse wire must melt easily (low MP) and develop enough heat (high R) to break circuit on overload.
This question belongs to: Science Physics
Question #1133
The heating element of an electric heater is made of nichrome because it has
A. Low resistivity and low melting point
B. High resistivity and high melting point
C. Low resistivity and high melting point
D. High resistivity and low melting point
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
High resistivity for heat generation; high melting point to withstand high temperature without melting.
This question belongs to: Science Physics
Question #1134
In an electric circuit, ammeter is connected in
A. Either
B. Series
C. Parallel
D. Across load
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Ammeter must be in series to measure full current. Very low internal resistance.
This question belongs to: Science Physics
Question #1135
Magnetic field lines inside a bar magnet go from
A. Random
B. Depends on material
C. South to North
D. North to South
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Outside N to S, inside S to N, forming closed loops.
This question belongs to: Science Physics
Question #1136
The device which converts mechanical energy into electrical energy is
A. Motor
B. Transformer
C. Rectifier
D. Generator
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Generator uses electromagnetic induction to produce electricity from mechanical motion.
This question belongs to: Science Physics
Question #1137
The atomic number of an element is equal to the number of
A. Electrons in nucleus
B. Nucleons
C. Protons
D. Neutrons
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Atomic number Z = number of protons (and electrons in neutral atom). Mass number = protons+neutrons.
This question belongs to: Science Physics
Question #1138
Which of the following is an isotope of hydrogen?
A. Protium only
B. Tritium
C. All of these
D. Deuterium
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Protium (¹H), Deuterium (²H), Tritium (³H) are all isotopes of hydrogen, differing in neutron number.
This question belongs to: Science Physics
Question #1139
Gamma rays have
A. Greatest charge
B. Greatest mass
C. Highest ionising power
D. Highest penetrating power
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Gamma rays are EM waves, no mass/charge, highly penetrating, least ionising. Alpha has highest ionising power.
This question belongs to: Science Physics
Question #1140
Radioactivity was discovered by
A. Curie
B. Rutherford
C. Becquerel
D. Roentgen
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.
This question belongs to: Science Physics

More Science Topics

Biology MCQs
chemistry MCQs
Today's Top Topics
Biology 2054 Physics 1287 chemistry 1089
Explore Subjects
Geography GK 6121 Static General Knowledge 6362 Maths 5575 Economy GK 2220 English 15164
Practice Mix
Select the most appropriate meaning of the idiom: 'A queer fish'.
x86-64 is also known as:
My eyes are tired because I ___ on the computer for hours.
He stands ___ the door.
Which railway system is designed exclusively for urban mass rapid transport?