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

A current-carrying conductor is clench in totally vertical direction. In order to produce a clockwise magnetic feld around the conductor, the current should passed in the conductor:

from top towards bottom

from left towards right

from bottom towards top

from right towards left

2 / 15

For a current in a long straight solenoid N and S-poles are created at the two ends. Among the subsequent declaration , the incorrect declaration is:

The feld 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

The strong magnetic feld produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil

The pattern of the magnetic feld associated with the solenoid is diferent from the pattern of the magnetic field around a bar magnet

The N and S-poles exchange position when the direction of current through the solenoid is reversed

3 / 15

Which of the subsequent is not attracted by a magnet:

Steel

Cobalt

Brass

Nickel

4 / 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.

5 / 15

The nature of magnetic field line passing through the centre of current carrying circular loop is:

circular

ellipse

parabolic

straight line

6 / 15

When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is

Twice to that when angle is 60°

Thrice to that when angle is 60°

zero

infinite

7 / 15

Which of the following component influence the strength of force experience by a current carrying conduct in a uniform magnetic field?

magnetic field strength

magnitude of current in a conductor

length of the conductor within magnetic field

All of above

8 / 15

A D.C generator works on the theory of:

ohnis law

Joule’s law of heating

faraday’s law of electromagnetic induction.

none of the above

9 / 15

Overloading is caused to:

Insulation of wire is damaged

fault in the appliances

accidental hike in supply voltage

All of the above

10 / 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

11 / 15

The commercial motors use a soft iron core on which the coil is wound because

to increase the power of the electric motor

to decrease the power of the electric motor

to reduce the power of the electric motor.

none

12 / 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

13 / 15

Commercial electric motors do not use

A permanent magnet to rotate the armature

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

A soft iron core on which the coil is wound

An electromagnet to rotate the armature

14 / 15

The magnetic feld inside a long straight solenoid carrying current is

zero

same at all points

uneven

none of these

15 / 15

The law states that if the forefinger indicates the direction of the magnetic field and thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current

fleming left hand rule

Fleming right hand rule

ohms law

none

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Science : Ch 13 – Magnetic Effects of Electric Current

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