12th physics chapter 5 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 5 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 5 all objective solutions – download PDF
1. The earth behaves as a magnet with magnetic field pointing approximately from the geographic
-
- (a) North to South
- (b) South to North
- (c) East to West
- (d) West to East
Answer: (b) South to North
2. The strength of the earth’s magnetic field is
-
- (a) constant everywhere.
- (b) zero everywhere.
- (c) having very high value.
- (d) vary from place to place on the earths surface.
Answer: (d) vary from place to place on the earths surface.
3. Which of the following is responsible for the earth’s magnetic field?
-
- (а) Convective currents in earth’s core
- (b) Diversive current in earth’s core.
- (c) Rotational motion of earth.
- (d) Translational motion of earth.
Answer: (а) Convective currents in earth’s core
4. Which of the following independent quantities is not used to specify the earth’s magnetic field?
-
- (a) Magnetic declination (θ).
- (b) Magnetic dip (δ).
- (c) Horizontal component of earth’s field (BH).
- (d) Vertical component of earth’s field (BV).
Answer: (d) Vertical component of earth’s field (BV).
5. Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is
-
- (a) always zero
- (b) positive, negative or zero
- (c) unbounded
- (d) always negative
Answer: b
6. The angle of dip at a certain place where the horizontal and vertical components of the earth’s magnetic field are equal is
-
- (a) 30°
- (b) 75°
- (c) 60°
- (d) 45°
Answer: (d) 45°
7. The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component
the value of angle of dip at this place is
-
- (a) 30°
- (b) 45°
- (c) 60°
- (d) 90°
Answer: (c) 60°
8. At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 103-5T and resultant magnetic field is 4 × 103-5 The angle of dip at this place is
-
- (a) 30°
- (b) 60°
- (c) 90°
- (d) 45°
Answer: (b) 60°
9. Which of the following property shows the property of ferromagnetic substances?
-
- (a) The ferromagnetic property depends on tem-perature.
- (b) The ferromagnetic property does not depend on temperature.
- (c) At high enough temperature ferromagnet becomes a diamagnet.
- (d) At low temperature ferromagnet becomes a paramagnet.
Answer : (a) The ferromagnetic property depends on tem-perature.
10. The primary origin of magnetism lies in
-
- (a) atomic current and intrinsic spin of electrons.
- (b) polar and non polar nature of molecules.
- (c) pauli exclusion principle.
- (d) electronegative nature of materials.
Answer: (a) atomic current and intrinsic spin of electrons.
11. Magnetic moment for solenoid and corresponding bar magnet is
-
- (a) equal for both
- (b) more for solenoid
- (c) more for bar magnet
- (d) none of these
Answer: (a) equal for both
12. Which of the following is correct about magnetic monopole?
-
- (a) Magnetic monopole exist.
- (b) Magnetic monopole does not exist.
- (c) Magnetic monopole have constant value of monopole momentum.
- (d) The monopole momentum increase due to increase at its distance from the field.
Answer: (b) Magnetic monopole does not exist.
13. Which of the following is not showing the essential difference between electrostatic shielding by a conducting shell and magnetostatic shielding?
-
- (a) Electrostatic field lines can end on charges and conductors have free charges.
- (b) Magnetic field lines can end but conductors cannot end them.
- (c) Lines of magentic field cannot end on any material and perfect shielding is not possible.
- (d) Shells of high permeability materials can be used to divert lines of magnetic field from the interior region.
Answer: (b) Magnetic field lines can end but conductors cannot end them.
14. The net magnetic flux through any closed surface, kept in a magnetic field is
-
- (a) zero
- (b) μ04π
- (c) 4πμ0
- (d) 4μ0π
Answer: (a) zero
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Bihar board 12th physics chapter 5 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 |