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AJAY PARMAR
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GROUP TUITION
Chapter – 5, MAGNETIC EFFECTS OF ELECTRIC CURRENT
Section – 1
1. The direction of magnetic field lines in a region outside the bar magnet is _____.
(A) from the N pole towards the S pole of a magnet.
(B) from the S pole towards the N pole of a magnet.
(C) in the direction coming out from both the poles of magnet.
(D) in the direction entering in both the poles of magnet.
2. Which of the following statements is false?
(A) the direction of magnetic field lines is from N to S.
(B) in the region where the magnetic field lines are at a close distance from each other, there will be a
strong magnetic field.
(C) the magnetic field lines form close loops.
(D) the magnetic field lines can cross each other.
3. By which instrument can be the presence of magnetic field be determined?
(A) voltmeter
(B) ammeter
(C) galvanometer
(D) magnetic needle
4. Who had first observed the magnetic effect of an electric current?
(A) Faraday
(B) Oersted
(C) Volta
(D) Ampere
5. With the help of which law can the direction of a magnetic field be decided?
(A) Faraday’s law
(B) Fleming’s right hand rule
(C) right hand thumb rule
(D) Fleming’s left hand rule
6. According to right hand rule thumb rule, whose direction is indicated by a thumb?
(A) electric current (B) magnetic field
(C) magnetic force (D) motion of a conductor
7. The magnetic field produced in a straight conducting wire on passing the current through it is ____.
(A) in the direction of current
(B) in the direction opposite to the current
(C) circular around the wire
(D) in the direction parallel to the wire
8. What is the shape of field line of a magnetic field passing through the centre of current carrying circular
ring?
(A) circular
(B) straight line
(C) ellipse
(D) magnetic field is zero at centre of the ring
9. Whose magnetic field is like a magnetic field of a bar magnet?
(A) current carrying wire
(B) current carrying ring
(C) current carrying solenoid
(D) horseshoe magnet
10. Who gave the principle of electromagnetic induction?
(A) Faraday
(B) Oersted
(C) Ampere
(D) Volta
11. Which is the direction of magnetic force acting on a current carrying wire placed in a magnetic field?
(A) along magnetic field
(B) along the electric current
(C) perpendicular to magnetic field
(D) opposite to magnetic field
12. How is a current carrying wire placed in a magnetic field so that magnetic field does not act on it?
(A) parallel to magnetic field
(B) perpendicular to magnetic field
(C) at an angle of 45 with magnetic field (D) at an angle of 120 with magnetic field
13. From which of the following cases, the induced current in the loop will not be obtained?
(A) the loop is moved in the direction of the magnet
(B) the magnet is moved in the direction of the loop.
(C) the loop and magnet are moved in the opposite direction with the same speed.
(D) the loop and magnet are moved in one direction with same speed.
14. Which instrument is used to convert electrical energy into mechanical energy?
(A) electric generator (B) electric motor
(C) electric iron
(D) electric oven
15. On which principle does the electric generator work?
(A) electric energy is converted into mechanical energy.
(B) electric energy is converted into thermal/heat energy.
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AJAY PARMAR
GROUP TUITION
(C) mechanical energy is converted into electric energy.
(D) electric energy is converted into light energy.
16. The magnitude of AC voltage used in India is ______ and its frequency is _____.
(A) 110V, 60Hz
(B) 110V, 50Hz
(C) 220V, 50Hz
(D) 220V, 60Hz
17. Traditionally which coloured wire is used for earthing?
(A) red
(B) black
(C) green
(D) white
18. Which type of current is obtained from a battery?
(A) DC current
(B) AC current
(C) current of AC and DC both type
(D) depends upon type of battery
19. Which instrument is used to know the presence of an electric current?
(A) fuse
(B) galvanometer
(C) voltmeter
(D) magnetic needle
20. A fuse wire is/an _____.
(A) conductor having low melting point
(B) insulator having low melting point
(C) semi - conductor having low melting point
(D) conductor having high melting point
21. ____ rule is used to known the direction of an induced current in the circuit.
(A) Fleming’s left hand
(B) Fleming’s right hand
(C) Right hand thumb
(D) Ampere’s
22. Who gave the principle of electromagnetic induction?
(A) Faraday
(B) Ampere
(C) Oersted
(D) Ohm
23. How many times does an AC electric with the frequency 50Hz change its direction?
(A) 25
(B) 50
(C) 100
(D) 200
24. Which type of current is obtained from a battery?
(A) DC
(B) AC
(C) Both AC amd DC
(D) depends on the type of battery
25. At the center of which of the following four circular rings has minimum magnetic field while passing
equal current through each of them?
I
(a)
(A) a
I
I
I
(b)
(B) b
(c)
(C) c
(d)
(D) d
Section – 2
A
1.
2.
3.
4.
5.
B
6.
7.
C
8.
9.
Answer the following in one or two sentences:
10
Explain construction of a solenoid and discuss effect of an electric current passing through it.
Write a note on DC.
Write a note on AC.
State any four precautions to be taken while using electricity.
State the characteristics and importance of a fuse.
Answer the following in brief:
4
Define: Right Hand Thumb Rule and Fleming’s left hand rule.
Write a note on earthing wire and state its importance.
Answer the following:
6
Explain electromagnetic induction.
Explain the principle, construction and working of the electric generator (DC) with diagram.
Write its applications.
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D Answer the following in detail:
5
10. Explain the principle, construction and working of the electric motor. State its applications.
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AJAY PARMAR
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GROUP TUITION
Answers:
1. A
2. D
3. D
4. B
5. C
6. A
7. C
8. B
9. C
10. A
11. C
12. A
13. D
14. B
15. C
16. C
17. C
18. A
19. B
20. A
21. B
22. A
23. C
24. A
25. D
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