12th physics chapter 2 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 2 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 2 all objective solutions – download PDF
1. The dimensions of fall of potential per unit distance are given by:
-
- (a) [MLT-3 A-1]
- (b) [ML2T-2A-1]
- (c) [ML2T-2A-3]
- (d) [MLT-2A-2]
Answer: (c) [ML2T-2A-3]
2. Which of the following is blocked by a capacitor ?
-
- (a) A.C.
- (b) D.C.
- (c) Both A.C. and D.C.
- (d) Neither A.C. nor D. C
Answer: (b) D.C.
3. Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?
-
- (a) Solid sphere
- (b) Hollow sphere
- (c) Both will have an equal charge
- (d) None of these
Answer: (c) Both will have an equal charge
4. The capacitance of a capacitor will decrease if we introduce a slab of:
-
- (a) copper
- (b) aluminium
- (c) zinc
- (d) None of these
Answer: (d) None of these
5. Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?
-
- (a) 72 V
- (b) 60 V
- (c) 48 V
- (d) zero
Answer: (a) 72 V
6. In which of the following forms is the energy stored in a capacitor?
-
- (a) Charge
- (b) Potential
- (c) Capacitance
- (d) Electric field
Answer: (d) Electric field
7. Two conducting spheres of radii r1and r2 are equally charged. The ratio of their potential is
-
- (a) (r1/r2)²
- (b) (r1r2)²
- (c)(r1/r2)
- (d) (r2/r1)
Answer: (b) (r1r2)²
8. Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?
-
- (a) 180 V
- (b) 90 V
- (c) 120 V
- (d) 45 V
Answer: (b) 90 V
9. The P.E. of an electric dipole is maximum when it makes an angle θ with electric field. The value of θ is :
-
- (a) π2
- (b) π
- (c) zero
- (d) 3π2
Answer: (b) π
10. The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :
-
- (a) 1.8 J
- (b) 2.4 J
- (c) 1.8 µJ
- (d) 2.4 µJ
Answer: (b) 2.4 J
mcq solution 12th physics chapter 2
11. An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is:
-
- (a) 1 J
- (b) 1.6 × 10-19 J
- (c) 10-19 J
- (d) None of these
Answer: (b) 1.6 × 10-19 J
12. A bird sitting on a high power line:
-
- (a) gets killed instantly
- (b) gets a mild shock
- (c) gets a fatal shock
- (d) is not affected practically
Answer: (d) is not affected practically
13. Choose the SI unit of electric potential energy :
-
- (a) Joule
- (b) Coulomb
- (c) Netwon per coulomb
- (d) Erg
Answer: (a) Joule
14. The capacitance of earth, viewed as a spherical conductor of radius 6408 km is:
-
- (a) 1420 µF
- (b) 712 µF
- (c) 680 µF
- (d) 540 µF
Answer: (b) 712 µF
15. A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:
-
- (a) cell is < E
- (b) cell is E
- (b) cell is > E
- (d) capacitor is E
Answer: (b) cell is E
16. If a +ve charge is moved from low to high potential region,
the electric potential energy:
-
- (a) decreases
- (b) increases
- (c) remain the same
- (d) may increase or decrease
Answer: (b) increases
17. A capacitor is connected across a battery and the plate separation of capacitor is increased without removing the battery, then:
-
- (a) capacitance will increase
- (b) charge stored will increase
- (c) energy stored will decrease
- (d) potential difference will increase
Answer: (c) energy stored will decrease
18. Two capacitors of 3 µF and 6 µF are connected in series with a battery of P.d. 12 V. The P.d. across 3µF and 6µF
capacitors respectively will be :
-
- (a) 8 V, 4 V
- (b) 6 V, 6 V
- (c) 4 V, 8 V
- (d) 9 V, 3 V
Answer: (a) 8 V, 4 V
19. An electric charge of 425 f µC is removed from a fully charged capacitor of capacitance 8.5µF. Its potential will be lowered by:
-
- (a) 75 V
- (b) 100 V
- (c) 85 V
- (d) 50 V
Answer: (b) 100 V
20. A dielectric is placed in between the two parallel plates of a capacitor as shown in the figure. The dielectric constant of the dielectric being K. If the initial capacity is C, then the new capacity will be:
-
- (a) (K + l).C
- (b) K.C
- (c) (K+1)2 C
- (d) (k – l) C
Answer: (c) (K+1)2 C
bihar board 12th physics chapter 2
21. Minimum number of capacitor of 2µF each required to obtain a capacitance of 5µF will be:
-
- (a) 4
- (b) 3
- (c) 5
- (d) 6
Answer: (a) 4
22. When a dielectric slab is introduced between the plates of a parallel plate capacitor which remains connected to a battery then charge on the plates relative to earlier charge is :
-
- (a) more
- (b) less
- (c) less or may be more
- (d) same
Answer: (a) more
23. Choose the vector physical quantity:
-
- (a) Electric flux
- (b) Electric potential
- (c) Electric potential energy
- (d) Electric intensity
Answer: (d) Electric intensity
24. The surface density of charge is measure:
-
- (a) Cm-1
- (b) Cm-2
- (c) Cm-3
- (d) JC-1
Answer: (b) Cm-2
25. A polythene piece rubbed with wool is found to have a negative charge of 6.4 × 10-9 How many electrons have been transferred during the process?
-
- (a) 4 × 1012
- (b) 4 × 1011
- (c) 4 × 1010
- (d) None of these
Answer: (c) 4 × 1010
16. In the above question:
-
- (a) no electrons are transferred
- (b) electrons are transferred from wool to x polythene
- (c) electrons are transferred from polythene to wool
- (d) nothing can be decided
Answer: (b) electrons are transferred from wool to x polythene
27. In previous question, mass transferred to polythene is:
-
- (a) 3.64 × 1020 kg
- (b) 4 × 10-28 kg
- (c) 4 × 1010 kg
- (d) None of these
Answer: (a) 3.64 × 1020 kg
28. What is the number of electrons in 100 g water?
-
- (a) 3.35 × 1024
- (b) 3.35 × 1025
- (c) 6.02 × 1023
- (d) None of these
Answer: (a) 3.35 × 1024
29. A uniform electric field of 10 NC-1exists in the vertically downward direction. What is the increase in the electric potential asonegoes up through a height of 300 cm ?
-
- (a) 15 V
- (b) 30 V
- (c) 45V
- (d) None of these
Answer: (b) 30 V
30. The electric potential of earth is taken as:
-
- (a) zero
- (b) infinity
- (c) unity
- (d) None of these
Answer: (a) zero
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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 |