All Free Physics MCQs with Answers
Every Physics question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,934 questions · page 655 of 697
- A. Systematic error
- B. Zero error
- C. Precise error
- D. Random Error
Explanation: Parallax error is due to the positioning of the eye while recording a value.
Correct answer: Random Error- A. First increases and then becomes zero
- B. First increases and then becomes constant at some value
- C. Increases with the passage of time
- D. Remains zero
Explanation: Explanation:At that instant when the switch is closed momentarily current flows through the secondary coil due to change in magnetic flux.
Correct answer: First increases and then becomes zero- A. 2.5V
- B. 25V
- C. 250V
- D. 0.25V
Explanation: According to faraday's law of electromagnetic induction, whenever there is change in magnetic flux, in this particular case there's change…
Correct answer: 25V- A. 10 V
- B. 12 V
- C. 14 V
- D. 16 V
Explanation: Given: Magnetic field strength = B = 0.6 T Length = L = 1m Velocity = v = 20 m/s emf = ε = ?
Correct answer: 12 V- A. NmA-2s-1
- B. NmAs-1
- C. NmA-1s-1
- D. NmA-2s1
Explanation: The unit of magnetic flux change (∆Φ) is measured in webers (Wb), and the unit of time change (∆t) is measured in seconds.
Correct answer: NmA-1s-1- A. Rotated about a north-south axis
- B. Rotated about an east-west axis
- C. Moved rapidly, without rotation toward the east
- D. Moved rapidly, without rotation toward the south
Explanation: When the copper hoop is rotated about an east-west axis, the maximum induced emf is produced.
Correct answer: Rotated about an east-west axis- A. Zero
- B. 2
- C. 1
- D. 1/2
Explanation: B is the correct option. This option is correct. The emf will be maximum when the value of the sine function is at its maximum.
Correct answer: 1- A. Coulomb's law
- B. Faraday's Law
- C. Ampere's law
- D. Hook's law
Explanation: Transformers and generators work on the principle of Faraday s Law.
Correct answer: Faraday's Law- A. Slow compression of a gas into a cylinder
- B. Changes due to friction
- C. Explosion
- D. Dissipation of energy
Explanation: The correct answer is Option A: Slow compression of a gas into a cylinder.
Correct answer: Slow compression of a gas into a cylinder- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In the context of thermodynamics and gas behavior, an "isotherm" refers to a curve or line on a graph representing a process that occurs…
Correct answer: Option D- A. Adiabatic processes
- B. Isothermal process
- C. Cooling process
- D. First law of thermodynamics
Explanation: The burst of a tire is a sudden process. The process occurs instantaneously, such that the system does not get sufficient time to exchange…
Correct answer: Adiabatic processes- A. Q = W
- B. W = -U
- C. Q = -ΔU
- D. Q = ΔU + W
Explanation: An isothermal process is a thermodynamic process in which the temperature of a system remains constant.
Correct answer: Q = W- A. 50%
- B. 70%
- C. 90%
- D. 95%
Explanation: The efficiency of a Carnot engine is entirely a function of the temperatures of the hot and cold reservoirs you use.
Correct answer: 50%13094. Isobaric processes occur at:
- A. Constant temperature
- B. Constant pressure
- C. Constant volume
- D. Constant temperature and constant pressure
Explanation: Isobaric process is a process in which the change in pressure is 0 i.e.
Correct answer: Constant pressure- A. Increases
- B. Decreases
- C. Remains constant
- D. Both B and C
Explanation: Drag force is a resistive force, which can only increase as forward force increases.
Correct answer: Decreases- A. r = √qvt / 2ρg
- B. r2 = 9ηvt / ρg
- C. r2 = 9ηvt / 2ρg
- D. r = 9ηvt / 2ρg
Explanation: Explanation If ρ is the density of the droplets then its volune can be expressed as: V = 4/3 πr³As, ρ = m / VSo, ρ = m / (4/3 πr³ρ) m =…
Correct answer: r2 = 9ηvt / 2ρg- A. 500 Km min-1
- B. 500 Km sec-1
- C. 1000 Km h-1
- D. 500 Km h-1
Explanation: Explanation:The lifting of a bullet train above the rails due to magnetic fields reduces friction, allowing the train to reach higher…
Correct answer: 500 Km h-1- A. F = 6πηrv
- B. F = (4/3)πr3ρg
- C. F = 6πηr2ρ
- D. F = 2gr2ρ/9η
Explanation: Stokes' Law describes the drag force experienced by a small spherical object moving through a fluid at a low velocity.
Correct answer: F = 6πηrv- A. Pascal's Law
- B. Hooke's Law
- C. Boyle's Law
- D. Charles's Law
Explanation: Explanation:By Pascal's law, pressure on each side of the container and everywhere in the container is the same provided the density of…
Correct answer: Pascal's Law- A. Mass
- B. Density
- C. Pressure
- D. Force
Explanation: In an incompressible fluid, particles have a constant density. An incompressible fluid is defined as one whose density does not change on…
Correct answer: Density