# Physics MCQ Class 12 With Answers

## Physics MCQ Class 12 With Answers

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Here are 20 multiple choice questions related to Physics for class 12, along with their answers and a brief explanation for each answer:

Which of the following is a vector quantity?
A) Density
B) Volume
C) Temperature
D) Velocity
Explanation: Velocity is a vector quantity because it has both magnitude and direction, unlike density, volume, and temperature.

The time period of a simple pendulum depends on which of the following factors?
A) The amplitude of oscillation
B) The mass of the pendulum bob
C) The length of the pendulum
D) All of the above
Answer: C) The length of the pendulum
Explanation: The time period of a simple pendulum is directly proportional to the square root of the length of the pendulum, and is independent of the amplitude of oscillation and the mass of the pendulum bob.

Which of the following statements is true about the force of friction?
A) Frictional force always opposes motion
B) Frictional force always acts in the direction of motion
C) Frictional force is directly proportional to the velocity of the object
D) Frictional force is independent of the nature of the surfaces in contact
Answer: A) Frictional force always opposes motion
Explanation: The force of friction always acts in the opposite direction of the motion of the object, which is why it is called an opposing force.

Which of the following is an example of circular motion?
A) A stone falling from a cliff
B) A car moving in a straight line
C) A child riding a merry-go-round
D) A rocket launching into space
Answer: C) A child riding a merry-go-round
Explanation: Circular motion refers to the motion of an object around a fixed point or axis, and a child riding a merry-go-round is an example of this kind of motion.

Which of the following statements is true about electric potential?
A) Electric potential is a scalar quantity
B) Electric potential is always positive
C) Electric potential depends on the distance between charges
D) Electric potential is independent of the charge on the particles
Answer: A) Electric potential is a scalar quantity
Explanation: Electric potential is a scalar quantity because it has only magnitude and no direction.

Which of the following is a unit of electric current?
A) Coulomb
B) Joule
C) Volt
D) Ampere
Explanation: Ampere is the SI unit of electric current, and is defined as the flow of one coulomb of charge per second.

Which of the following statements is true about an ideal gas?
A) An ideal gas has no mass
B) An ideal gas occupies no volume
C) An ideal gas follows the ideal gas law
D) An ideal gas does not exert any pressure
Answer: C) An ideal gas follows the ideal gas law
Explanation: An ideal gas is a theoretical gas that follows the ideal gas law, which relates the pressure, volume, temperature, and number of molecules of a gas.

Which of the following is an example of a longitudinal wave?
A) Sound waves
B) Light waves
C) X-rays
Explanation: Sound waves are an example of longitudinal waves, which are waves that travel in the same direction as the disturbance or displacement of the medium.

Which of the following statements is true about the image formed by a convex mirror?

A) The image is always upright
B) The image is always smaller than the object
C) The image is always virtual
D) The image is always inverted
Answer: C) The image is always virtual
Explanation: A convex mirror always forms a virtual image, which means that the image is formed behind the mirror and cannot be projected onto a screen.

Which of the following statements is true about electromagnetic waves?
A) Electromagnetic waves require a medium to travel through
B) Electromagnetic waves are transverse waves
C) Electromagnetic waves cannot be produced artificially
D) Electromagnetic waves travel at a constant speed in a vacuum
Answer: D) Electromagnetic waves travel at a constant speed in a vacuum
Explanation: Electromagnetic waves are transverse waves that do not require a medium to travel through and travel at a constant speed of 3 x 10^8 m/s in a vacuum.

Which of the following is an example of a centripetal force?
A) Gravity
B) Friction
C) Tension in a string
D) Inertia
Answer: C) Tension in a string
Explanation: Centripetal force is the force that keeps an object moving in a circular path, and tension in a string is an example of this kind of force.

Which of the following is a type of electromagnetic radiation with the shortest wavelength?
C) X-rays
D) Gamma rays
Explanation: Gamma rays have the shortest wavelength and highest frequency among all types of electromagnetic radiation.

Which of the following statements is true about the photoelectric effect?
A) The photoelectric effect occurs when photons are absorbed by a metal
B) The photoelectric effect occurs only with ultraviolet light
C) The photoelectric effect can be explained using classical physics
D) The photoelectric effect is independent of the frequency of the incident light
Answer: A) The photoelectric effect occurs when photons are absorbed by a metal
Explanation: The photoelectric effect is the emission of electrons from a metal surface when it is exposed to light, and is explained using quantum mechanics.

Which of the following is a type of nuclear decay in which an alpha particle is emitted?
A) Beta decay
B) Gamma decay
C) Positron decay
D) Alpha decay
Explanation: Alpha decay is a type of nuclear decay in which an alpha particle, consisting of two protons and two neutrons, is emitted from the nucleus of an atom.

Physics MCQ Class 12 With Answers continue…

Which of the following is an example of an exothermic reaction?
A) Photosynthesis
B) Combustion of fossil fuels
C) Electrolysis of water
D) Rusting of iron
Answer: B) Combustion of fossil fuels
Explanation: An exothermic reaction is a reaction that releases heat, and combustion of fossil fuels is an example of this kind of reaction.

Which of the following is a characteristic of a blackbody?
A) A blackbody absorbs all radiation incident on it
B) A blackbody reflects all radiation incident on it
C) A blackbody transmits all radiation incident on it
D) A blackbody emits radiation that depends only on its temperature
Answer: D) A blackbody emits radiation that depends only on its temperature
Explanation: A blackbody is an object that absorbs all radiation incident on it and emits radiation that depends only on its temperature,

Which of the following is true about the critical angle?
A) It is the angle at which total internal reflection occurs
B) It is the angle at which partial reflection occurs
C) It is the angle at which refraction occurs
D) It is the angle at which reflection and refraction are equal
Answer: A) It is the angle at which total internal reflection occurs
Explanation: The critical angle is the angle of incidence at which light is refracted at an angle of 90 degrees, causing total internal reflection to occur.

Which of the following statements is true about a simple harmonic oscillator?
A) The restoring force is proportional to the displacement from equilibrium
B) The restoring force is proportional to the velocity
C) The period of oscillation depends on the amplitude
D) The period of oscillation depends on the mass of the oscillator
Answer: A) The restoring force is proportional to the displacement from equilibrium
Explanation: In a simple harmonic oscillator, the restoring force is directly proportional to the displacement of the oscillator from its equilibrium position.

Which of the following statements is true about the diffraction of light?
A) Diffraction is more pronounced for longer wavelengths of light
B) Diffraction is more pronounced for smaller apertures
C) Diffraction is not observed for a single slit
D) Diffraction is observed only for white light
Answer: B) Diffraction is more pronounced for smaller apertures
Explanation: Diffraction of light is the bending of light around an obstacle or through an aperture, and is more pronounced for smaller apertures.

Which of the following is an example of a vector quantity?
A) Temperature
B) Mass
C) Velocity
D) Energy