If you are a Bihar Board Class 12th Physics student preparing for the 2023 exam, this blog will be beneficial for you. In this post, you are provided with the Download Bihar Board Class 12 Physics Previous Year Question Paper 2023 with Solutions, which will further strengthen your preparation.with Solutions, which will further strengthen your preparation.
Bihar Board Class 12 Physics Previous Year Question Paper 2023
Bihar Board Class 12 Physics
1. Nickel is
(A) Paramagnetic
(B) Diamagnetic
(C) Ferromagnetic
(D) None of these
Answer: Ferromagnetic
2. Tre angle between magnetic meridian and geographical meridian is called
(A) angle of dip
(B) declination
(C) horizontal component of magnetic field
(D) apparent angle of dip
Answer:declination
3. The radius of curvature of each surface of a biconvex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is
(A) 20 m
(B) 1/ 20 m
(C) 20 cm
(D)1/20cm
Answer: 20m
4. For same wavelength of electron and photon, which physical quantity will be same?
(A) Velocity
(B) Energy
(C) Momentum
(D) Angular momentum
Answer:Momentum
5. The function of moderator in nuclear reactor is to
(A) Fast the speed of neutrons
(B) Slow the speed of neutrons
(C) Fast the speed of electrons
(D) Slow the speed of electrons
Answer: low the speed of neutrons
6. The impurity element used for p-type semiconductor is
(C) Arsenic
(D) Phosphorus
(A) Boron
(B) Bismuth
Answer:Boron
7. Diode is used as
(A) Amplifier
(B) Oscillator
(C) Modulator
(D) Rectifier
Answer:Rectifier
8. When the distance between source of light and screen is increased, then fringe width
(A) increases
(B) decreases
(C) remains same
(D) none of these
Answer:increases
9. The unit of radioactivity is
(A) MeV
(B) curie
(C) a.m.u.
(D) joule
Answer:curie
10. Which of the following has the highest penetrating power?
(A) a-rays
(B) B-rays
(C) y-rays
(D) Cathode rays
Answer:y-rays
11. Which range of frequency is used in TV transmission?
(A) 30 Hz-300 Hz
(B) 30 kHz-300 kHz
(C) 30 MHz-300 MHz.
(D) 30 GHz-300 GHz
Answer:30 MHz-300 MHz.
12. The dispersive power of a prism depends on
(A) Angle of incidence
(B) Nature of material of prism
(C) Refracting angle of prism
(D) Angle of prism
Answer:Nature of material of prism
13. LASER action needs
(A) Semiconductor
(B) High temperature
(C) Number inversion
(D) High pressure
Answer:Number inversion
14. Light is a transverse wave because it shows
(A) Polarization
(B) Interference
(C) Diffraction
(D) Reflection
Answer:Polarization
15. When current in a coil changes from 5 A to 2 A in 0.1s then average voltage of 501 is produced. The self-inductance of the coil is
(A) 1.67 henry
(B) 6 henry
(C) 3 henry
(D) 0.67 henry
Answer:1.67 henry
16. The concept of secondary wavelets was given by?
(A) Fresnel
(B) Maxwell
(C) Huygens
(D) Newton
Answer:Huygens
17. In photoelectric effect, the photoelectric current is independent of
(A) intensity of incident light
(B) potential difference applied between two electrodes
(C) the nature of emitter material
(D) frequency of incident light
Answer:frequency of incident light
18. In visible spectrum, which colour has larger wavelength?
(A) Red
(B) Yellow
(C) Blue
(D) Violet
Answer:Red
19. The nucleus of any atom is made up of
(A) proton-
(B) proton and electron
(C) a-particle
(D) proton and neutron
Answer:proton and neutron
21. Which one of the following electromagnetic radiations has minimum wavelength?
(A) Ultraviolet
(B) X-rays
(C) Microwaves
(D) y-rays
Answer:y-rays
20. The phase-difference between current and voltage in only capacitive alternating current circuit is
(A) 0°
(B) 90°
(C) 180°
(D) 45°
Answer:90°
22. The binary equivalent of 25 is
(A) (1001)2
(B) (11001)2
(C) (11101)2
(D) (1100)2
Answer:(11001)2
23. The width of diffraction fringes is to the width of interference fringes.
(A) equal
(B) unequal
(C) similar
(D) none of these
Answer:unequal
24. Light year is equal to
(A) 9.46 x 1015 m
(B) 9.46 x 10 m
(C) 9.46 x 1012 m
(D) 9.46 x 1010 m
Answer:9.46 x 1015 m
25. If any ammeter is shunted, then the total resistance of the circuit
(A) increases
(B) decreases
(C) remains same
(D) none of these
Answer:decreases
26. The temperature coefficient of a semi-conductor is
(A) Positive
(B) Negative
(C) Zero
(D) Infinity
Answer:Zero
27. If T is time period and Vis maximum speed of a charged particle in cyclotron, then
(A) TV
(B) TV2
(C) T V
(D) T V2
Answer:T V
28. Van de Graaff generator is an electrostatic machine which produces
(A) Only high current
(B) Only high voltage
(C) High current and high voltage
(D) Low current and low voltage
Answer:Only high current
29. S.I. unit of permittivity is
(A) NC2m²
(B) NC-2 m²
(C) C2N-1 m-2
(D) N-1 C1 m²
Answer:N-1 C1 m²
30. The net charge on a charged capacitor is
(A) zero
(Β) 1 μC
(C) 1 C
(D) infinite
Answer:1 μC
Disclaimer: The questions and answers used in this post are taken from the book “Golden Publication”. We give credit to Golden Publication for this, and this blog has been created for educational purposes only.