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Previous Year Question Paper Class 12 Physics Bihar Board. We covered all the Previous Year Question Paper Class 12 Physics Bihar Board in this post for free so that you can practice well for the exam.
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Previous Year Question Paper Class 12 Physics Bihar Board for Students
When a spring with a force constant k is cut into two equal sections, what will be the new force constant of each part?
(A) k
(B) 4k
(C) k/2
(D) 2k
Option d – 2k
A spring-mass system vibrates with frequency n. What happens to the frequency when it is taken inside an elevator moving upward with steady acceleration?
(A) Increases
(B) Decreases
(C) Remains constant
(D) Cannot be determined
Option a – Increases
A weight of M kg is hanging from a weightless spring with a time period T. What will be the new time period if the suspended weight becomes 4M kg?
(A) T
(B) T/2
(C) 2T
(D) 4T
Option c – 2T
A 1 kg mass hangs from a spring and oscillates with a particular frequency. How much mass should be added to reduce the frequency to half?
(A) 1 kg
(B) 2 kg
(C) 3 kg
(D) 4 kg
Option c – 3 kg
The amplitude of a damped oscillator drops to 90% of its initial value in 5 seconds. What will be its amplitude after another 10 seconds compared to the initial amplitude?
(A) 0.7
(B) 0.81
(C) 0.729
(D) 0.6
Option c – 0.729
A vertical spring extends by 2 cm when a 10 g weight is hung on it. The weight is further pulled down by 1 cm and released. What is the frequency of its oscillation?
(A) 1.69 Hz
(B) 3.52 Hz
(C) 1 Hz
(D) 4.341 Hz
Option b – 3.52 Hz
A 0.5 kg mass stretches a spring by 0.2 m. If a 0.25 kg mass is attached and set into oscillation, what will be the time period? (Take g = 10 m/s²)
(A) 3.14 s
(B) 0.314 s
(C) 0.628 s
(D) 6.28 s
Option c – 0.628 s
What does the mass-energy relationship indicate?
a. Mass remains unchanged
b. Energy remains unchanged
c. Momentum remains unchanged
d. Mass and energy can transform into each other
In the Michelson-Morley experiment, the fringe shift is:
a. Directly linked to Earth’s speed
b. Directly linked to the square of Earth’s speed
c. Inversely related to Earth’s speed
d. Inversely related to the square of the light’s wavelength
Option b – Directly linked to the square of Earth’s speed
The fringe shift observed in the Michelson-Morley experiment is:
a. Directly related to the wavelength of light
b. Directly related to the square of the wavelength
c. Inversely related to the wavelength of light
d. Inversely related to the square of the wavelength
Option c – Inversely related to the wavelength of light
If a velocity is added to the speed of light, the resulting speed is:
a. More than the speed of light
b. Less than the speed of light
c. Depends on the direction
d. Still equal to the speed of light
Option d – Still equal to the speed of light
The results from Einstein’s theory of relativity match Newton’s classical theory:
a. At low acceleration
b. At speeds much less than the speed of light
c. At speeds close to the speed of light
d. At all speeds
Option b – At speeds much less than the speed of light
How can the photoelectric current be increased?
a. By using higher frequency radiation
b. By using radiation of greater intensity
c. By using metals with a higher work function
d. By increasing the plate’s surface area
Option b – By using radiation of greater intensity
In the experiment that led to the discovery of neutrons, Beryllium was bombarded with:
a. Protons
b. Electrons
c. Positrons
d. Alpha particles
Option d – Alpha particles
Photons with 2.0 eV energy hit a metal plate and release electrons with a maximum speed V. When the wavelength is reduced by 25%, the speed of the photoelectrons doubles. What is the approximate work function of the metal?
a. 2.22 eV
b. 1.985 eV
c. 2.35 eV
d. 1.80 eV
Option d – 1.80 eV
In the Hall effect, in which direction does the drift current move?
a. Along the direction of the current
b. Along the direction of the magnetic field
c. Towards the sides perpendicular to both the magnetic field and the current
d. None of the above
Option c – Towards the sides perpendicular to both the magnetic field and the current
What is the behavior of a semiconductor at absolute zero?
a. Acts as an insulator
b. Acts as a conductor
c. Becomes a superconductor
d. None of these
Option a – Acts as an insulator
Where is the electron speed maximum in a diode? ( Previous Year Question Paper Class 12 Physics MCQ )
a. Near the cathode
b. Near the anode
c. Between the electrodes
d. Same throughout the diode
Option b – Near the anode
In a PN junction, what is the region with fixed donor and acceptor ions called?
a. Transition zone
b. Neutral zone
c. Depletion region
d. Active region
Option c – Depletion region
What is one common use of a diode? ( Previous Year Question Paper Class 12 Physics MCQ )
a. As an oscillator
b. As an amplifier
c. As a rectifier
d. None of the above
Option c – As a rectifier
When two capacitors are linked in parallel and a voltage is applied, what is the stored energy? ( Previous Year Question Paper Class 12 Physics MCQ )
a. -0.20 J
b. 0.10 J
c. 0.30 J
d. 0.05 J
Option b – 0.10 J
If a material has a dielectric constant of 80, what is its electric susceptibility?
a. 81
b. 79
c. 82
d. 78
Option b – 79
What is the electric susceptibility of a vacuum? ( Previous Year Question Paper Class 12 Physics MCQ )
a. 0
b. 1
c. -1
d. None of the above
Option a – 0
Two plates of a parallel-plate capacitor have a potential difference of 100 volts. What will the potential difference become if the distance between the plates is doubled?
a. 100 volts
b. 200 volts
c. 20 volts
d. 2 volts
Option b – 200 volts
What happens to the potential energy when a dielectric is inserted between the plates of a capacitor? ( Previous Year Question Paper Class 12 Physics MCQ )
a. It decreases
b. It increases
c. It remains unchanged
d. It both increases and decreases
Option a – It decreases
Which of the following quantities has the same numerical value across all systems of units?
a. Polarization
b. Electric displacement
d. Dielectric constant
Option d – Dielectric constant
When a dielectric material is inserted between the plates of a capacitor, the potential difference
a. Decreases
b. Increases
c. Remains unchanged
d. Both increases and decreases
Option a – Decreases
Which of the following statements about a satellite moving around the Earth is correct?
a. The satellite is controlled from ground stations.
b. The satellite stays in orbit using retro-rockets and solar energy.
c. The satellite needs power from solar panels and solid fuel to keep orbiting.
d. The satellite does not need any external energy to remain in orbit.
Option d – The satellite does not need any external energy to remain in orbit.
A satellite is moving in an elliptical path around the Earth. The speed of the satellite
a. Stays the same at all points of its orbit.
b. Is fastest when closest to Earth.
c. Is fastest when farthest from Earth.
d. None of the above
Option b – Is fastest when closest to Earth.
The orbital time of a satellite moving in a circular path around a planet does not depend on ( Previous Year Question Paper Class 12 Physics MCQ )
a. The height above the Earth’s surface.
b. The planet’s gravitational acceleration.
c. The mass of the satellite.
d. None of the above
Option c – The mass of the satellite.
If a satellite’s orbit moves closer to the Earth, its time period will
a. Increase
b. Decrease
c. Stay the same
d. Cannot be determined
Option b – Decrease
A satellite is revolving around the Earth in a circular orbit. If the Earth’s gravitational attraction suddenly disappears, what will happen to the satellite?
a. It will fall toward Earth with increasing speed.
b. It will continue moving along the same path with constant speed.
c. It will move straight in the tangential direction at the same speed.
d. It will eventually stop after moving a certain distance.
Option c – It will move straight in the tangential direction at the same speed.
Which of the following materials has the greatest elasticity? ( Previous Year Question Paper Class 12 Physics MCQ )
a. Rubber
b. Glass
c. Steel
d. Copper
Option c – Steel
The tendency of a material to return to its original shape and size after the removal of the deforming force is known as
a. Plasticity
b. Elasticity
c. Stress
d. Capillarity
Option b – Elasticity
A body is considered perfectly plastic if ( Previous Year Question Paper Class 12 Physics MCQ )
a. It fully regains its shape after the deforming force is removed.
b. It retains its deformed shape even after the deforming force is removed.
c. Its weight equals the buoyant force acting on it.
d. None of the above
Option b – It retains its deformed shape even after the deforming force is removed.
Which of the following is not a typical property of solids?
a. High compressibility
b. High density
c. Definite shape
d. High rigidity
Option a – High compressibility
The spring constant of a spring is influenced by its
a. Length only
b. Material only
c. Length and diameter
d. Thickness, diameter, and material
Option d – Thickness, diameter, and material
Steel is considered more elastic than rubber because it ( Previous Year Question Paper Class 12 Physics MCQ )
a. Needs a greater force to deform.
b. Cannot be deformed.
c. Is difficult to deform.
d. Is harder than rubber.
Option c – Is difficult to deform.
Hooke’s law holds true for which of the following?
(a) Only within the proportional limit on the stress-strain graph
(b) Throughout the entire stress-strain graph
(c) Throughout the entire elastic region of the stress-strain graph
(d) Both the elastic and plastic regions of the stress-strain graph
Option a – Only within the proportional limit on the stress-strain graph
When a force changes the shape of a body, the related stress is
(a) Tensile stress
(b) Bulk stress
(c) Shearing stress
(d) Compressive stress
Option c – Shearing stress
The breaking stress of a wire depends on which of the following factors? ( Previous Year Question Paper Class 12 Physics MCQ )
(a) The type of material of the wire
(b) The length of the wire
(c) The radius of the wire
(d) The cross-sectional shape of the wire
Option a – The type of material of the wire
Longitudinal strain is described as
(a) A small change in length under a large applied force
(b) A small change in length under a weak applied force
(c) A large change in length under a large applied force
(d) None of the above
Option a – A small change in length under a large applied force
The unit of strain is
(a) Newton
(b) Kilogram
(c) Kelvin
(d) None of these
Option d – None of these
The minimum critical angle occurs when light moves from ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Glass to water
(B) Water to glass
(C) Air to glass
(D) Glass to air
Option d – Glass to air
When monochromatic light passes from a medium with refractive index n₁ to another medium with refractive index n₂ (where n₂ > n₁):
(A) The speed increases by n₂/n₁
(B) The speed decreases by n₂/n₁
(C) The frequency decreases by n₂/n₁
(D) The wavelength increases by n₂/n₁
Option b – The speed decreases by n₂/n₁
What is the refractive index of a perfectly transparent material?
(A) 1
(B) Greater than 1
(C) Less than 1
(D) 1.33
Option a – 1
The sun appears larger just before sunset because of
(A) A change in the sun’s shape
(B) Scattering of light
(C) Refraction effects
(D) Diffraction effects
Option c – Refraction effects
For light rays striking at normal incidence, the correct relationship is ( Previous Year Question Paper Class 12 Physics MCQ )
(A) If i = 0°, then r = 90°
(B) If i = 90°, then r = 0°
(C) If i = 0°, then r = 0°
(D) If i = 90°, then r = 90°
Option c – If i = 0°, then r = 0°
The frequency of light after refraction
(A) Decreases
(B) Increases
(C) Remains constant
(D) Can either decrease or increase
Option c – Remains constant
When light enters a glass slab from the air
(A) Speed increases
(B) Wavelength increases
(C) Frequency increases
(D) Wavelength decreases
Option d – Wavelength decreases
When light moves from a denser medium to a less dense medium ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Speed increases
(B) Wavelength decreases
(C) Speed decreases
(D) Frequency increases
Option a – Speed increases
The bending of light when passing from one medium to another is called
(A) Reflection of light
(B) Dispersion of light
(C) Interference of light
(D) Refraction of light
Option d – Refraction of light
When light enters a new medium, which of these remains unchanged?
(A) Amplitude
(B) Wavelength
(C) Speed
(D) Frequency
Option d – Frequency
Light travels fastest in which of the following? ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Air
(B) Vacuum
(C) Diamond
(D) Water
Option b – Vacuum
The phenomenon where a ray of light changes direction when moving from one medium to another is called
(A) Interference of light
(B) Polarization of light
(C) Reflection of light
(D) Refraction of light
Option d – Refraction of light
If a plane mirror moves towards you at 10 cm/s, at what speed will your image move towards you?
(A) 5 cm/s
(B) 10 cm/s
(C) 20 cm/s
(D) 40 cm/s
Option c – 20 cm/s
For a particular light wave, if 4 x 10³ waves fit into 2 mm of air, what is the wavelength? ( Previous Year Question Paper Class 12 Physics MCQ )
(A) 0.5 μm
(B) 5 μm
(C) 500 μm
(D) 5000 μm
Option a – 0.5 μm
A light ray is reflected at an angle of 30°. If the angle of incidence is doubled, the new angle of reflection will be
(A) 15°
(B) 30°
(C) 60°
(D) 120°
Option c – 60°
The angle between the incoming light ray and the reflecting surface is called ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Angle of incidence
(B) Angle of reflection
(C) Glancing angle
(D) Angle of refraction
Option c – Glancing angle
The angle between the original direction of the incident ray and the reflected ray is known as
(A) Angle of emergence
(B) Angle of reflection
(C) Angle of refraction
(D) Angle of deviation due to reflection
Option d – Angle of deviation due to reflection
We are able to see objects because of
(A) Refraction
(B) Reflection
(C) Diffraction
(D) Interference
Option b – Reflection
If a light ray hits a surface at a 35° angle of incidence, the angle between the surface and the reflected ray is
(A) 35°
(B) 90°
(C) 55°
(D) 75°
Option c – 55°
When a light ray strikes a surface at 38°, the angle between the normal and the reflected ray is ( Previous Year Question Paper Class 12 Physics MCQ )
(A) 38°
(B) 52°
(C) 90°
(D) 76°
Option b – 52°
A light ray strikes a plane mirror at a 30° angle. The total deviation produced by the mirror is
(A) 30°
(B) 60°
(C) 90°
(D) 120°
Option d – 120°
The incident ray, the reflected ray, and the normal always lie ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Perpendicular to each other
(B) In the same plane
(C) With incident and reflected rays in opposite planes
(D) Either (A) or (C)
Option b – In the same plane
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