# Most Important MCQ Questions for Class 10 Science: Chapter 13 Magnetic Effects of Electric Current

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(a) Galvanometer
(b) Motor
(c) Generator
(d)Ammeter

(c) Generator

## Q2. Inside the magnet, the field lines moves

(a) from north to south
(b) from south the north
(c) away from south pole
(d) away from north pole

(a) from north to south

(a) Oersted
(c) Bohr
(d) Ampere

(a) Oersted

## Q4. By which instrument, the presence of magnetic field be determined?

(a) Magnetic Needle
(b) Ammeter
(c) Galvanometer
(d) Voltmeter

(d) Voltmeter

## Q5. The nature of magnetic field line passing through the centre of current carrying circular loop is

(a) circular
(b) ellipse
(c) parabolic
(d) straight line

(d) straight line

## Q6. The magnetic field near a long straight wire is described by

(a) Straight field lines parallel to the wire.
(b) Straight field lines perpendicular to the wire.
(c) Connective circle centered on the wire.
(d) Radial field lines starting from the wire.

(c) Connective circle centered on the wire.

## Q7. The pattern of the magnetic field produced by the straight current carrying conducting wire is

(a) in the direction opposite to the current
(b) in the direction parallel to the wire
(c) circular around the wire
(d) in the same direction of current

(a) in the direction opposite to the current

## Q8. At the time of short circuit, the current in the circuit

(a) vary continuously
(b) reduced considerably
(c) increases heavily
(d) does not change

(c) increases heavily

(a) mass
(b) speed
(c) velocity
(d) momentum

(c) velocity

(a) west
(b) north
(c) south
(d) east

(a) west

## Q11. Electric motor converts:

(a) chemical energy into electric energy
(b) electric energy into mechanical energy
(c) mechanical energy into electric energy
(d) electric energy into chemical energy.

(b) electric energy into mechanical energy

## Q12. Unit of magnetic flux is:

(a) Weber / metre2
(b) Weber
(c) Weber/metre
(d) Weber-metre2

(b) Weber

## Q13. 1 Tesla is equal to:

(a) 1 Weber/m2
(b) 1 Gauss
(c) 10-4 Weber/m2
(d) 10-4 Gauss.

(a) 1 Weber/m2

(a) B = Ø/A
(b) Ø = B/A
(c) A = BØ
(d) B = ØA

(a) B = Ø/A

(a) weber
(b) weber/metre
(c) weber/metre2
(d) weber-metre

(a) weber

## Q16. Unit of magnetic flux is:

(a) newton-ampere-metre
(b) newton-metre/ampere
(c) newton/ampere-metre
(d) newton-ampere/metre

(b) newton-metre/ampere

## Q17. The magnitude of induced e.m.f. is:

(a) proportional to the rate of change of field lines
(b) proportional to earth’s magnetic field
(c) depend on material of coil
(d) inversely proportional to the rate of change of speed of magnet.

(a) proportional to the rate of change of field lines

(a) charge
(b) mass
(c) momentum
(d) energy

(d) energy

(a) motor
(b) dynamo
(c) galvanometer
(d) transformer

(b) dynamo

## Q20. Dynamo converts:

(a) chemical energy into electric energy
(b) sound energy into magnetic energy
(c) mechanical energy into electric energy
(d) mechanical energy into light energy.

(c) mechanical energy into electric energy

## Q21. The Magnetic Field Lines:

(A) Intersect at right angles to one another
(B) Interest at an angle 45° to each another
(C) Do not cross one another
(D) Cross at an angle of 60° to one another

(C) Do not cross one another

## Q22. Commercial Electric Motors Do Not Use

(A) An electromagnet to rotate the armature
(B) Effectively large number of turns of conducting wire in the current carrying coil
(C) A permanent magnet to rotate the armature
(D) A soft iron core on which the coil is wound

(C) A permanent magnet to rotate the armature

## Q23. For A Current In A Long Straight Solenoid N- And S-Poles Are Created At The Two Ends. Among The Following Statements, The Incorrect Statement Is

(A) The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
(B) The strong magnetic field produced inside the solenoid can be used to magnetize a piece of magnetic material like soft iron, when placed inside the coil
(C) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
(D) The N- and S-poles exchange position when the direction of current through the solenoid is reversed

(C) The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet

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