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

Fleming’s Right-hand rule gives:

magnitude of the induced current.

magnitude of the magnetic field

direction of the induced current

both, direction and magnitude of the induced current

2 / 15

The magnetic feld inside a long straight solenoid carrying current is:

uneven

zero

same at all points

None of these

3 / 15

Relative strength of magnetic field at a point in the space adjoining the magnet is shown by the:

length of magnet

thickness of magnet

degree of closeness of the field.

resistance offered by the surroundings

4 / 15

By which instrument, the presence of magnetic field be resolved?

Magnetic Needle

Ammeter

Galvanometer

Voltmeter

5 / 15

Direction of rotation of a coil in electric motor is intent by:

fleming’s right hand rule

fleming’s left hand rule

faraday law of electromagnetic inductors

None of these

6 / 15

In electric motor, to make the coil rotating constantly in the identical direction, current is reversed in the coil after every half rotation by a device called:

carbon brush

commutator

slip ring

armature

7 / 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

8 / 15

Overloading is caused to:

Insulation of wire is damaged

fault in the appliances

accidental hike in supply voltage

All of the above

9 / 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

10 / 15

Which of the following is not attracted by a magnet:

Steel

cobalt

nickel

brass

11 / 15

An electron moves with a speed v along positive direction of the x-axis. If a magnetic feld B acts along the positive y-direction, then the force on the electron will act along

x axis

y axis

–ve z-direction

+ve z-direction

12 / 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

13 / 15

The magnetic feld inside a long straight solenoid carrying current is

zero

same at all points

uneven

none of these

14 / 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

15 / 15

When a strong bar magnet is pushed into a coil of insulated copper wire connected to a galvanometer, we will observe a deflection in the galvanometer in

unidirection

bidirection

multidirection

none

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Science : Ch 13 – Magnetic Effects of Electric Current

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