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
A spring of force constant k is cut into two equal parts. Then the force constant of each piece is :
(A) k
(B) 4 k
(C) k/2
(D) 2 k
Option d – 2 k
A spring-mass system oscillates with frequency n. If it is taken in an elevator slowly accelerating upward, the frequency will ( Previous Year Question Paper Class 12 Physics MCQ )
(A) Increases
(B) Decrease
(C) remains constant
(D) can not be predicted
Option a – Increases
M kg weight is suspended from a weightless spring and it has a time period T. If now 4M kg weight is suspended from the same spring, the new time period will be :
(A) T
(B) T/2
(C) 2 T
(D) 4 T
Option c – 2 T
A mass of 1 kg attached to the bottom of a spring has a certain frequency of vibration. The following mass has to be added to it in order to reduce the frequency by half ( Previous Year Question Paper Class 12 Physics MCQ )
(A) 1 kg
(B) 2 kg
(C) 3 kg
(D) 4 kg
Option c – 3 kg
The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5s. In another 10s it will decrease to times its original magnitude, where a equals :
(A) 0.7
(B) 0.81
(C) 0.729
(D) 0.6
Option c – 0.729
A vertical light spring is stretched by 2 cm when a weight of 10 g is attached to its free end. The weight is further pulled down by 1 cm and released. The frequency of oscillation is ( Previous Year Question Paper Class 12 Physics MCQ )
(A) 1.69 Hz
(B) 3.52 Hz
(C) 1 Hz
(D) 4.341 Hz
Option b – 3.52 Hz
A spring is stretched by 0.2 m when the mass of 0.5 kg is suspended. Calculate the period of the spring when a mass of 0.25 kg is suspended and put to oscillate (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
Mass-energy relation implies that ( Previous Year Question Paper Class 12 Physics MCQ )
a. Mass is conserved
b. Energy is conserved
c. Momentum is conserved
d. Mass and energy are mutually convertible
The fringe shift in the Michelson-Morley experiment is:
a. Directly proportional to the velocity of the earth
b. Directly proportional to the square of the velocity of the earth
c. Inversely proportional to the velocity of the earth
d. Inversely proportional to the square of the wavelength of light
Option b – Directly proportional to the square of the velocity of the earth
The fringe shift in the Michelson-Morley experiment is ( Previous Year Question Paper Class 12 Physics MCQ )
a. Directly proportional to the wavelength of light
b. Directly proportional to the square of the wavelength
c. Inversely proportional to the wavelength of light
d. Inversely proportional to the square of the wavelength of light
Option c – Inversely proportional to the wavelength of light
Any velocity added to the velocity of light gives a velocity:
a. > the velocity of light
b. < the velocity of light
c. depends upon the direction
d. Equal to the velocity of light
Option d – Equal to the velocity of light
The results of the relativistic theory agree with the results of the classical theory of Newton ( Previous Year Question Paper Class 12 Physics MCQ )
a. For small acceleration
b. For small velocities compared to that of light
c. For large velocities compared to that of light
d. For any velocity
Option b – For small velocities compared to that of light
Photoelectric current can be increased by using:
a. Higher frequency radiation
b. Higher intensity radiation
c. Higher work function metal plates
d. The higher area of the plate
Option b – Higher intensity radiation
In the neutron discovery experiment, the Beryllium element is bombarded by ( Previous Year Question Paper Class 12 Physics MCQ )
a. Proton
b. Electron
c. Positron
d. α-Particle
Option d – α-Particle
Photons of energy 2.0 eV fall on a metal plate and release photoelectrons with a maximum velocity of V. By decreasing λ by 25%, the maximum velocity of photoelectrons is doubled. The work function of the metal of the material plate in eV is nearly:
a. 2.22
b. 1.985
c. 2.35
d. 1.80
Option d – 1.80
In which direction does current carry drift in the Hall effect? ( Previous Year Question Paper Class 12 Physics MCQ )
a. Towards current direction
b. Towards magnetic field
c. Towards sides perpendicular to both magnetic field and current
d. None of the above
Option c – Towards sides perpendicular to both magnetic field and current
At absolute zero temperature, a semiconductor behaves like
a. Insulator
b. Conductors
c. Superconductors
d. None of the above
Option a – Insulator
Where is the velocity of electrons 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. The same throughout the tube
Option b – Near the anode
In a PN junction, the region containing the uncompensated acceptor and donor ions is called
a. Transition region
b. Neutral region
c. Depletion region
d. Active region
Option c – Depletion region
A diode can be used for making ( Previous Year Question Paper Class 12 Physics MCQ )
a. An oscillator
b. An amplifier
c. A rectifier
d. None of the above
Option c – A rectifier
Two capacitors are connected in parallel, and a potential is applied at their ends. The energy stored in the system will be
a. -0.20 J
b. 0.10 J
c. 0.30 J
d. 0.05 J
Option b – 0.10 J
The dielectric constant of a substance is 80. Its susceptibility is ( Previous Year Question Paper Class 12 Physics MCQ )
a. 81
b. 79
c. 82
d. 78
Option b – 79
Electric susceptibility for vacuum is
a. 0
b. 1
c. -1
d. None of the above
Option a – 0
The potential difference between two plates of a parallel plate condenser is 100 volts. If the separation between plates is doubled, what will be the new potential difference? ( Previous Year Question Paper Class 12 Physics MCQ )
a. 100 volts
b. 200 volts
c. 20 volts
d. 2 volts
Option b – 200 volts
The potential energy when a dielectric is placed between the plates of a condenser
a. decreases
b. increases
c. no change
d. increases and decreases
Option a – decreases
Which of the following properties gives the same value in all systems of units ( Previous Year Question Paper Class 12 Physics MCQ )
a. polarization
b. Electric displacement
d. Dielectric constant
Option d – Dielectric constant
The potential difference between the plates when a dielectric is placed between the plates
a. decreases
b. increases
c. doesn’t change
d. increases and decreases
Option a – decreases
Which one of the following statements about a satellite orbiting around the Earth is correct? ( Previous Year Question Paper Class 12 Physics MCQ )
(a) The satellite is kept in orbit by remote control from a ground station.
(b) A satellite is kept in orbit by retro-rockets, and solar energy keeps it moving around the earth.
(c) Satellite requires energy from solar panels and solid fuels for orbiting.
(d) Satellite does not require any energy for orbiting.
Option d – Satellite does not require any energy for orbiting
A satellite revolves around the Earth in an elliptical orbit. Its speed
(a) is the same at all points in the orbit.
(b) is greatest when it is closest to the earth.
(c) is greatest when it is farthest from the earth.
(d) None of the above
Option b – is greatest when it is closest to the earth
The period of a satellite in a circular orbit around a planet is independent of ( Previous Year Question Paper Class 12 Physics MCQ )
(a) height above the Earth.
(b) acceleration due to gravity.
(c) the mass of the satellite.
(d) None of the above
Option c – the mass of the satellite
If a satellite is shifted toward the Earth, then the time period of the satellite will
(a) increase
(b) decrease
(c) remain unchanged
(d) nothing can be said
Option b – decrease
A satellite revolves around the Earth in a circular orbit. If gravitational pull suddenly disappears, then it ( Previous Year Question Paper Class 12 Physics MCQ )
(a) falls down with increasing speed.
(b) continues to move with the same speed and along the same path.
(c) moves with the same speed tangential to the original orbit.
(d) comes to rest after moving a certain distance along the original path.
Option c – moves with the same speed tangential to the original orbit
Which one of the following substances possesses the highest elasticity?
(a) Rubber
(b) Glass
(c) Steel
(d) Copper
Option c – Steel
The property of matter by virtue of which a body tends to regain its original shape and size after the removal of deforming force is called ( Previous Year Question Paper Class 12 Physics MCQ )
(a) plasticity
(b) elasticity
(c) stress
(d) capillarity
Option b – elasticity
The body is called a perfectly plastic body
(a) if the body completely gains its original shape after the removal of the deforming force.
(b) if the body remains in a deformed shape even after the removal of the deforming force.
(c) if the weight of the body is equal to the force of buoyancy
(d) None of the above
Option b – if the body remains in a deformed shape even after the removal of the deforming force
Which of the following is not a characteristic of a solid? ( Previous Year Question Paper Class 12 Physics MCQ )
(a) High compressibility
(b) High density
(c) Regular shape
(d) High rigidity
Option a – High compressibility
The spring constant of a spring depends on its
(a) length only
(b) material only
(c) length and its diameter
(d) thickness, its diameter, and its material
Option d – thickness, its diameter, and its material
Steel is more elastic than rubber because it ( Previous Year Question Paper Class 12 Physics MCQ )
(a) requires a larger deforming force.
(b) is never deformed.
(c) is deformed very easily.
(d) is harder than rubber.
Option c – is deformed very easily
Hooke’s law is valid for
(a) only proportional region of the stress-strain curve.
(b) entire stress-strain curve.
(c) entire elastic region of the stress-strain curve.
(d) elastic as well as plastic region of the stress-strain curve.
Option a – only proportional region of the stress-strain curve
If by applying a force, the shape of a body is changed, then the corresponding stress is ( Previous Year Question Paper Class 12 Physics MCQ )
(a) tensile stress
(b) bulk stress
(c) shearing stress
(d) compressive stress
Option c – shearing stress
The breaking stress of the wire depends on
(a) the material of the wire.
(b) length of the wire.
(c) radius of the wire.
(d) shape of the cross-section of the wire.
Option a – the material of the wire
Longitudinal strain is defined when ( Previous Year Question Paper Class 12 Physics MCQ )
(a) under a large force change in length is smaller.
(b) under a weak force change in length is smaller.
(c) under a large force change in length is larger.
(d) None of the above
Option a – under a large force change in length is smaller
The unit of strain is
(a) Newton
(b) Kilogram
(c) Kelvin
(d) None of these
Option d – None of these
The critical angle will be minimum when a ray passes 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 a monochromatic ray of light travels from a medium of refractive index n₁ to a medium of refractive index n₂ (n₂>n₁) :
(A) speed increases by a factor of n₂/n₁
(B) speed decreases by a factor of n₂/n₁
(C) the frequency decreases by a factor of n₂/n₁
(D) wavelength increases by a factor of n₂/n₁
Option b – speed decreases by a factor of n₂/n₁
What will be the value of the refractive index for the perfectly transparent material medium? ( Previous Year Question Paper Class 12 Physics MCQ )
(A) unity
(B) > 1
(C) < 1
(D) 1.33
Option a – unity
Just before the time of sunset, the sun appears to be bigger because
(A) the sun changes its shape at that time
(B) of the scattering of light
(C) of the effects of refraction
(D) of the effects of diffraction
Option c – of the effects of refraction
In the case of refraction of light for normal incidence, there are ( Previous Year Question Paper Class 12 Physics MCQ )
(A) i = 0 then r= 90°
(B) i = 90° then r=0
(C) i = 0 then r = 0
(D) i = 90° then r=90°
Option c – i = 0 then r = 0
The frequency of light after refraction will :
(A) decrease
(B) increase
(C) remains the same
(D) (A) or (B)
Option c – remains the same
When a ray of light enters a glass slab from the air it ( Previous Year Question Paper Class 12 Physics MCQ )
(A) velocity increases
(B) wavelength increases
(C) frequency increases
(D) wavelength decreases
Option d – wavelength decreases
When a ray of light passes from a denser to a rarer medium. As a result, it:
(A) velocity increases
(B) wavelength decreases
(C) velocity decreases
(D) frequency increases
Option a – velocity increases
When light propagates from one medium to another, it deviates from its original path is called ( Previous Year Question Paper Class 12 Physics MCQ )
(A) reflection of light
(B) dispersion of light
(C) interference of light
(D) refraction of light
Option d – refraction of light
When light passes from a vacuum into a medium, which of the following always remains unchanged :
(A) amplitude
(B) wavelength
(C) velocity
(D) frequency
Option d – frequency
The velocity of light is maximum in ( Previous Year Question Paper Class 12 Physics MCQ )
(A) air
(B) vacuum
(C) Diamond
(D) water
Option b – vacuum
The phenomenon of change in the path of a ray of light, when it passes from one medium to another medium, is called :
(A) interference of light
(B) polarization of light
(C) reflection of light
(D) refraction of light
Option d – refraction of light
If the plane mirror is approaching you at 10 cm/s Then at what speed will your image approach you?
(A) 5 cm/s
(B) 10 cm/s
(C) 20 cm/s
(D) 40 cm/s
Option c – 20 cm/s
For a certain light, there are 4 x 10³ waves in 2 mm of air. The wavelength of light is :
(A) 0.5 μm
(B) 5 μm
(C) 500 μm
(D) 5000 μm
Option a – 0.5 μm
A ray is reflected at an angle of 30°. If the angle of incidence becomes double. Then the angle of reflection will be :
(A) 15°
(B) 30°
(C) 60°
(D) 120°
Option c – 60°
The angle between the incident ray and the reflecting surface is :
(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 :
(A) the angle of emergence
(B) angle of reflection
(C) angle of refraction
(D) the angle of deviation due to reflection
Option d – the angle of deviation due to reflection
We can see objects due to the:
(A) refraction
(B) reflection
(C) diffraction
(D) interference
Option b – reflection
A ray of light is incident at an angle of incidence 35°, and the angle between the reflecting surface and the reflected ray is :
(A) 35°
(B) 90°
(C) 55°
(D) 75°
Option c – 55°
A ray is incident at an angle with a surface is 38°. The angle between the normal and the reflected ray is :
(A) 38°
(B) 52°
(C) 90°
(D) 76°
Option b – 52°
A light ray is an incident at an angle of 30° on a plane mirror, reflecting from the mirror. The deviation produced by the mirror on the ray is :
(A) 30 °
(B) 60°
(C) 90°
(D) 120°
Option d – 120°
The incident ray, normal, and reflected ray reflection lies :
(A) perpendicular to each other
(B) in the same plane
(C) the incident and reflected ray are in an opposite plane
(D) either (A) or (C)
Option b – in the same plane
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