Bihar board Physics chapter 1 class 12: specially we focused on Bihar board latest pattern of physics, and on this post covered class 12th physics chapter 1 based on Bihar board. check out below to get full solutions of physics chapter 1 class 12 bihar board.
12th physics chapter 1 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 1 full solution |
| content | physics objective type MCQ question with answer |
| name of subjects | class 12 physics |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th physics chapter 1 all objective solutions – download PDF
1. Which one of the following is the unit of electric field?
-
- (a) Coulomb
- (b) Newton
- (c) Volt
- (d) N/C
Answer: (d) N/C
2. Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
-
- (a) +3q
- (b) +2q
- (c) -3q
- (d) -4q
Answer: (a) +3q
3. If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
-
- (a) always zero
- (b) never zero
- (c) depend upon capacity of dipole
- (d) None
Answer: (a) always zero
4. The number of electron-taken out from a body to produce 1 coulomb of charge will be :
-
- (a) 6.25 × 1018
- (b) 625 × 1018
- (c) 6.023 × 1023
- (d) None
Answer: (a) 6.25 × 1018
5. The work done in rotating an electric dipole in an electric field:
-
- (a) W = ME (1 – cos θ)
- (b) W = ME tan θ
- (c)W = ME sec θ
- (d) None
Answer: (a) W = ME (1 – cos θ)
6. If sphere of bad conductor is given charge then it is distributed on:
-
- (a) surface
- (b) inside the surface
- (c) only inside the surface
- (d) None
Answer: (d) None
7. Electric field in a cavity of metal:
-
- (a) depends upon the surroundings
- (b) depends upon the size of cavity
- (c) is always zero
- (d) is not necessarily zero
Answer: (d) is not necessarily zero
8. The dielectric constant of a metal is:
-
- (a) 0
- (b) 1
- (c) ∞
- (d) -1
Answer: (c) ∞
9. 1 coulomb is equal to:
-
- (a) 3 × 109 e.s.u.
- (b) 13 × 109 e.s.u.
- (c) 3 × 1010 e.s.u.
- (d) 13 × 1010 e.s.u.
Answer: (a) 3 × 109 e.s.u.
10. Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
-
- (a) 1
- (b) 4
- (c) 1/16
- (d) 16
Answer: (d) 16
bihar board 12th physics chapter 1
11. Coulomb’s law in vector form can be written as
F⃗= (1/4πεn) (q1q2/r2)r⃗
where ε0 is the permitivity of free space. The SI units of ε0 will be:
-
- (a) N-1m-2C-2
- (b) Nm-2C2
- (c) N-1m-2C9
- (d) Nm-2C2
Answer: (c) N-1m-2C9
12. The dimensional representation of cu will be :
-
- (a) [MLT4 A2]
- (b) [M-1L-3T4A2]
- (c)[ML-2T ]
- (d) None of these
Answer: (b) [M-1L-3T4A2]
13. When placed in a uniform field, a dipole experiences:
-
- (a) a net force
- (b) a torque
- (c) both a net force and torque
- (d) neither a net force nor a torque
Answer: (b) a torque
14. A parrot comes and sits on a bare high power line. It will:
-
- (a) experience a mild shock ‘
- (b) experience a strong shock.
- (c) get killed instantaneously
- (d) not be affected practically
Answer: (d) not be affected practically
15. The SI units of electric dipole moment are:
-
- (a) C
- (b) Cm-1
- (c) Cm
- (d) Nm-1
Answer: (c) Cm
16. If two conducting sphere are connected after charging separately then:
-
- (a) Electrostatic energy sphere energy will remain conserved
- (b) Electrostatic energy charges remains conserved
- (c) Electrostatic energy energy and charge remains conserved
- (d) None
Answer: (b) Electrostatic energy charges remains conserved
17. A soap bubble is given a negative charge, then its radius:
-
- (a) increases
- (b) decreases
- (c) remains unchanged
- (d) may increase or decrease
Answer: (a) increases
18. In non-uniform electric field, electric dipole experiences:
-
- (a) torque only
- (b) torque as well as net force
- (c) force only
- (d) None of these
Answer: (b) torque as well as net force
19. An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :
-
- (a) 1.6 ms-2
- (b) 1.6 × 1018ms-2
- (c) 3.2 × 1018ms-2
- (d) 0.8 × 1018 ms-2
Answer: (b) 1.6 × 1018ms-2
20. A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:
-
- (a) λ/2λε0r2
- (b) λ/4πε0r
- (c) λ2/2πε0r
- (d) λ/2πε0r
Answer: (b) λ/4πε0r
22. Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :
-
- (a) 4L
- (b) 8L
- (c) L/4
- (d) 2L
Answer: (d) 2L
23. The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :
-
- (a) straight line
- (b) parabola
- (c) hyperbola
- (d) None of these
Answer: (d) None of these
24. Corona discharge takes place:
-
- (a) at the surface of a conductor
- (b) near the sharp points of a conductor
- (c) outside the conductor
- (d) at the centre of the conductor
Answer: (b) near the sharp points of a conductor
25. The belt of a Vande Graaf generator gets charge by :
-
- (a) corona discharge
- (b) induction
- (c) electrification
- (d) None of these
Answer: (a) corona discharge
26. Quantisation of charge implies:
-
- (a) Charge does not exist
- (b) Charge exists on particles
- (c) There is a minimum permissible magnitude of charge
- (d) Charge can’t be created
Answer: (c) There is a minimum permissible magnitude of charge
27. The conservation of electric charge implies that:
-
- (a) Charge can’t be created
- (b) Charge can’t be destroyed
- (c) The number of charged particle in the universe is constant
- (d) Simultaneous creation of equal and opposite charges is permissible
Answer: (d) Simultaneous creation of equal and opposite charges is permissible
28. The number of electrons contained in one coulomb of charge is:
-
- (a) 6.25 × 1018
- (b) 6.25 × 1017
- (c) 6.25 × 1019
- (d) 1.6 × 1019
Answer: (a) 6.25 × 1018
29. The unit of intensity of electric field is :
-
- (a) metre/volt
- (b) Joule/newton
- (c) Coulomb/newton
- (d) Newton/coulomb
Answer: (a) metre/volt
30. 1 V equals to:
-
- (a) 1 J
- (b) 1 JC-1
- (c) 1 CJ-1
- (d) 1 JC
Answer: (b) 1 JC-1
31. 1 V m-1equals to:
-
- (a) 1 N
- (b) 1 Mm-1
- (c) 1 NC-1
- (d) 1 J-1
Answer: (c) 1 NC-1
32. The minimum amount of charge observed so far is:
-
- (a) 1 C
- (b) 4.8 × 1-13 C
- (c) 1.6 × 10-19 C
- (d) 1.6 × 1019 C
Answer: (c) 1.6 × 10-19 C
33. The ratio of electric force between two electrons to the gravitational force between them is of the order:
-
- (a) 1042
- (b) 1039
- (c) 1036
- (d) 1
Answer: (a) 1042
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Bihar board 12th physics chapter 1 complete objective
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Bihar board 12th science stream subjects wise solution
click here to check out Bihar board science stream all subjects solutions
| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |