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Bihar Board 12th/Inter Physics Model Question Paper Answer Key 2021; Bihar Board has released the model question paper of Bihar Board Inter Annual Exam 2021. In this post we have shared the answer key and solution of Bihar Board Physics Model Paper 2021.

Those students who are going to appear in Bihar Board Inter Annual Exam 2021 can download the Model Paper from the official website or from this page also. Students can download the solution and answer key of Bihar Board Physics Model Paper 2021 from this post. Below we shared the solution and answer of Bihar Board Physics Model Paper 2021.

## Bihar Board 12th/Inter Physics Model Question Paper Answer Key 2021

The official solution and answer key of MCQ Objective question of Bihar Board Inter Physics Model Paper 2021 has been released. The answer key of Bihar Board Inter Physics Model Paper 2021 has been given below. Candidates can download the Bihar Board Inter Physics Model Paper 2021 from this page.

## Bihar Board Inter Physics Model Paper Solution & Answer 2021

Ques 1. Electric field near a charged plane conductor is?

Ans- (A) E=σ/ϵ0.

Ques 2. Which of the following relation between electric field (E) and electric potential (V) is correct ?

Ans- (A) E=−dv/dr​

Ques 3. Electrical capacity of spherical conductor of radius 9 km is

Ans- (A) 1 μF

Ques 4. Capacitance of parallel plate capacitor is

Ans- (A) ϵ0ϵrA/d

Ques 5. Which of the following relation between ‘G’ the resistance of galvanometer and ‘V’, the resistance of voltmeter is correct ?

Ans-

Ques 6. Which of the following is the applied form of wheatstone bridge ?

Ans- (C) Metre Bridge

Ques. 7. The specific resistance of a wire depends upon its

Ans- (D) Nature of Material

Ques. 8. Which of the following physical quantity is conserved in Kirchoff’s point-rule ?

Ans- (B) Charge

Ques. 9. Motion of electron inside a conductor is

Ans- (C) uniform average /Drifting

Ques. 10. Power of electric circuit is –

Ans- (c) V2/R

Ques. 11. Which of the following is correct for force on moving charge in a magnetic field ?

Ans- (B) F = q (V x B)

Ques. 12. The unit of magnetic flux is ?

Ans- (C) tesla

Ques. 13. Power factor of a circuit having resistance only is –

Ans- (B) Zero

Ques. 14. Root mean square value of alternating current is equal to

Ans- (C) Peak current/√2

Ques. 15. Which of the following is the correct relation between geometric length (Lg) and magnetic length (Lm) of a magnet ?

Ans- (B) Lg =5/6 Lm

Ques. 16. Which of the following is correct for earth’s magnetic field, if BH horizontal component of earth magnetic field and d is angle of dip.

Ans-

Ques. 17. The unit of intensity of magnetisation is

Ans-

Ques. 18. Magnetic meridian is

Ans-

Ques. 19. The magnifying power of simple micriscope in normal adjustment

is

Ans-

Ques. 20. The focal-length of a normal eye-lens is about

Ans-

Ques. 21. Critical angle for diamond is –

Ans-

Ques. 22. The equivalent lens of two convex lenses in contact is

Ans-

Ques. 23. The basic principle of optical fibre is

Ans-

Ques. 24. The least distance for clear vision for normal eye is

Ans-

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Ques. 25. Which of the following phenomena of light is correct for the

formation of rainbow?

Ans-

Ques. 26. The refractive index of glass is more for which colour of light ?

Ans-

Ques. 27. The Path difference for destructive interferenc is

Ans-

Ques. 28. Which of the following phenomena confirms the transverse wave

nature of light ?

Ans-

Ques. 29. Bending of light from the corners of an obstacle is called –

Ans-

Ques. 30. Work-function of silver is

Ans-

Ques. 31. The value of planck constant is

Ans-

Ques. 32. Dynamic Mass of photon is

Ans-

Ques. 33. Which of the following series is in ultraviolet region ?

Ans-

Ques. 34. Which of the following is not applicable for radioactivity ?

Ans-

Ques. 35. Fast moving electrons are

Ans-

Ques. 36. a-particle is –

Ans-

Ques. 37. The relation among ragne of transmitting antenna (d), height of T.V.

transmssion tower (h) and radius of earth (R) is –

Ans-

Ques. 38. Energy of hydrogen atom in the ground state is

Ans-

Ques. 39. When an impurity is doped into an intrinsic semiconductor its

Conductivity

Ans-

Ques. 40. The Boolean expression for NOR gate is

Ans-

Ques. 41. Which of the following is the correct output frequency for input

frequency of 50Hz in half wave rectification ?

Ans-

Ques. 42. Which of the following is the decimal number of binary number

(11110)2

Ans-

Ques. 43. Charge on an electron is

Ans

Ques. 44.Î0 is equal to.

Ans-