12th Board Exam Physics Chapter 4 Moving Charges & Magnetism Objective Question
Moving Charges And Magnetism
1. Accelerated charge produces :
(A) Alpha Rays
(B) Gamma Rays
(C) Beta Rays
(D) Electromagnetic Wave
| Answer:- D |
2. A charged particle enters into a magnetic field at 30° with induction vector. Its path becomes
(A) circular
(B) helical
(C) elliptical
(D) straight line
| Answer:- B |
3. When an ammeter is shunted, its measuring range
(A) increases
(B) decreases
(C) remains constant
(D) None of these
| Answer:- A |
4. The resistance of an ammeter of range 1 ampere is 0.9 Ω. To increase its range to 10 amperes, the required shunt is
(A) 0.1 Ω
(B) 0.01 Ω
(C) 0.9 Ω
(D) 1 Ω
| Answer:- A |
5. The magnetic effect of electric current was discovered by
(A) Ampere
(B) Oersted
(C) Fleming
(D) Faraday
| Answer:- B |
6. A current of 10A exists in a straight wire. If it (wire) makes an angle of 30° with the magnetic field, the force on 1 meter of the wire will be
(A) 7.5 newton
(B) 15 newton
(C) 75 newton
(D) 150 newton
| Answer:- A |
7. The magnetic field produced at the centre of a current bearing circular loop is directed
(A) in the plane of the coil
(B) normal to the plane of the coil
(C) at 45° with the plane of the coil
(D) at 18° with the plane of the coil
| Answer:- B |
8. Uniform magnetic field is produced
(A) by a straight current bearing wire
(B) at the center by a circular loop bearing a current
(C) at an axial point due to current in a circular loop
(D) inside a solenoid due to its current direct
| Answer:- D |
9. The rule to determine the direction of a Lorentz force is
(A) Fleming’s left-hand rule
(B) Fleming’s right-hand rule
(C) Maxwell’s right-handed screw-cork rule
(D) Ampere’s swimming person rule
| Answer:- A |
10. The current in a wire is due east and the wire is placed in a north-directed magnetic field, the force on the wire will be directed
(A) eastward
(B) southward
(C) vertically downward
(D) vertically upward
| Answer:- D |
11. To convert a galvanometer into an ammeter
(A) a low resistance is connected in parallel
(B) a high resistance is connected in series
(C) a low resistance is connected in series
(D) a high resistance is connected in parallel
| Answer:- A |
12. A galvanometer can be converted into an ammeter by connecting with its
(A) a high resistance in parallel
(B) a high resistance in series
(C) a low resistance in series
(D) a low resistance in parallel
| Answer:- B |
13. A voltmeter can be converted into an ammeter by connecting with it
(A) a high resistance in parallel
(B) a high resistance in series
(C) a low resistance in parallel
(D) a low resistance in series
| Answer:- C |
14. The resistance of an ideal ammeter is
(A) small
(B) large
(C) infinite
(D) zero
| Answer:- D |
15. The resistance of an ideal voltmeter is
(A) small
(B) large
(C) infinite
(D) zero
| Answer:- C |
16. The SI unit of magnetic induction (B) is
(A) weber
(B) tesla
(C) gauess
(D) None of these
| Answer:- B |
17. The electric current in a vertical wire is directed from bottom to top. If an electron beam is directed horizontally towards the wire, it gets deflected
(A) rightward
(B) upward
(C) downward
(D) leftward
| Answer:- B |
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