Science : Ch 13 – Magnetic Effects of Electric Current

This test is designed based on NCERT Syllabus for Class 10 Topics : Magnetic Effects of Electric Current

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

Commercial electric motors neglect :

An electromagnet to rotate the armature

Effectively large number of turns of conducting wire in the current carrying coil

A permanent magnet to rotate the armature

A soft iron core on which the coil is wound

2 / 15

Which of the subsequent is not attracted by a magnet:

Steel

Cobalt

Brass

Nickel

3 / 15

The magnetic field lines:

intersect at right angles to one another

interest at an angle 45° to each another

do not cross one another

cross at an angle of 60° to one another

4 / 15

Magnetic effect of current was identified by:

Oersted

Faraday

Bohr

Ampere

5 / 15

Which of the following declaration is not correct about the magnetic field?

Magnetic field lines form a continuous closed curve

Magnetic field line do not interest each other

Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point.

Outside the magnet, magnetic field lines go from South to North pole of the magnet.

6 / 15

The strength of each of magnet reduces to half when it cut along its length into the equal parts magnetic field strength of a solenoid. Polarity of solenoid can be determined by:

use of compass needle

Right hand thumb rule

fleming left hand rule

either (a) or (b)

7 / 15

A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid:

will decrease

will remains same

will increase

will become zero

8 / 15

The instrument that use to direct electric current in the circuit is known as:

Electric motor

A.C generator

Galvanometer

None of the above

9 / 15

when an iron core is inserted into a current carrying solenoid

strength of the magnetic field produced inside the solenoid remains unchanged

strength of the magnetic field produced inside the solenoid decreases

strength of the magnetic field produced inside the solenoid increases

no effect

10 / 15

A coil of many circular turns of wire wrapped in the shape of a cylinder

Bar magnet

solenoid

horse shoe magnet

none

11 / 15

The change in magnetic feld lines in a coil is the cause of induced electric current in it. Name the underlying phenomenon.

Electromagnetic induction

Electromagnetic conduction

Electromagnetic repulsion

Electromagnetism

12 / 15

The magnetic feld inside a long straight solenoid carrying current is

zero

same at all points

uneven

none of these

13 / 15

The phenomenon discovered by Faraday.

electromagnetic induction

Electromagnetic conduction

Electromagnetic repulsion

Electromagnetism

14 / 15

The deflection of the galvanometer becomes zero the moment the motion of

magnet stops.

magnet starts

magnet remains constant

none of these

15 / 15

You are holding the current-carrying wire in your right hand so that your thumb points in the direction of current, then the direction in which your fingers encircle the wire will give the direction of the magnetic feld lines around the wire.explain

Maxwell’s left hand thumb rule

Maxwell’s right hand thumb rule

fleming right hand rule

fleming left hand rule

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Science : Ch 13 – Magnetic Effects of Electric Current

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