Bihar Board class 12th Physics Answer Key 2021

 Bihar Board class 12th Physics Answer Key 2021

Set-F
1. B (Potential difference विभवान्तर )
2. A ( 9x10⁹ Nm²c^-2
3. A (Vector E = Vector F/Q)

4. B (W/q)
5.A (cm)
6. B ( 1 CV^-1

7. B (½ cv²)

8. A ( Epsilon / Epsilon Not)
9. A ( 1/4 pi epsilon not x q/r)
10. B ( कुल आवेश/ कुल क्षेत्रफल  Total charge/total area)
11.A (80)
12. B ( 4pi epsilon not R)
13.A ( 1 Coulomb/1 second)
14. C ( Volt)
15. A ( p=Ra/L
16. C ( dv/dx)
17. C ( volt-metre)
18. C ( 4.2)
19. A ( Epsilon not A/d)
20. C (V²/R

21.D (1/wc)
22.A (
23.C (a-particle)
24.C (30-300 MHz)
25.A (decibel)
26.D (Uncharged at absolute zero temperature but charged at higher temperatures)
27.C (h/2pi)
28.C (5)
29.C (I².R.t)

30. A ( 5x Weber/(metre)2
31.C I _r.m.s = 0.707 I₀

32. B (w.L)
33.C ( Power factor= True average power/ apparent average power
34. C (5)
35.A
36.D (It increase or decrease A.C voltage)
37. C (A.m)
38.B (90)
39.D ( zero)
40.B 
41.A
42.D
43.A
44.A
45.B
46.A
47.A
48.A
49.D
50.B
51.A
52.B
53.D
54.A
55.D
56.C
57.A
58.B
59.A
60.B
61.C
62.A
63.C
64.A
65.A
66.B
67.A
68.B
69.D
70.B