Magnetism: MCQ Test (25 questions)

Question 1 of 25

The Earth is a huge magnet. In which direction does its magnetic field extend?

AEast to west
BWest to East
CNorth South
DSouth to North

Question 2 of 25

A freely suspended magnet always remains at-

Ain the north-east direction
Bin the north-west direction
Cin the north-south direction
Din the south-west direction

Question 3 of 25

The number of atoms in 1 domain is-

A10 12to 1015
B1015 to 1018
C10 18to 1021
D10 21to 1024

Question 4 of 25

The ratio of flux density and magnetic field strength in a medium is-

Amagnetization density
Breceptivity
Crelative prevalence
Dpermeability

Question 5 of 25

Magnets are an essential part of which of the following household appliances?

Acalling bell
Bfan
Cwashing machine
DAll of the above

Question 6 of 25

What are the numerous microscopic structures of atoms within ferromagnetic materials called?

Asolenoid
BToroid
Cdomain
DNone of these

Question 7 of 25

Which of the following is not a ferromagnetic substance?

AIron
BNickel
CCopper
DCobalt

Question 8 of 25

Fleming's left hand rule gives the direction of

AElectric current in a conductor placed in an electric field.
Bmagnetic field in an electric conductor
CThe direction of force in an electric conductor when the conductor is in a magnetic field
Dnone of these

Question 9 of 25

Temporary magnets are made from-

Aof steel
Bsoft iron
Ccopper
DSilver

Question 10 of 25

Which one of the following is paramagnetic in nature?

AIron
Bhydrogen
Coxygen
Dnitrogen

Question 11 of 25

Which of the following materials is most suitable for making the core of a transformer?

Asoft iron
Bstainless steel
CCopper
DNickel

Question 12 of 25

The laws of electromagnetic induction have been used to make which of the following?

Acurrent meter
BVolt Meter
Celectric motor
Dgenerator

Question 13 of 25

Which one of the following statements regarding 'bar magnet' is correct?

AThe pole strength of the north pole of a bar magnet is greater than that of its south pole.
BWhen a bar magnet is cut perpendicular to its axis, its north and south poles get separated.
CWhen a bar magnet is cut perpendicular to its axis, two new bar magnets are formed.
DThe poles of a bar magnet are unequal in magnitude and opposite in nature

Question 14 of 25

The Curie temperature of iron is-

A450°C
B575°C
C635°C
D780°C

Question 15 of 25

Where is the attractive force of a magnet the least?

Aon both sides
Bin the middle
Con the magnetic axis
DIt is the same everywhere

Question 16 of 25

If a magnet has a third pole, then the third pole is called—

AAdditional pole
BRandom poles
CFaulty pole
Dresultant pole

Question 17 of 25

A magnetic substance can be demagnetized by-

Aby hammering
Bheat up
Cboth of the above
Dnone of these

Question 18 of 25

Which of the following statements regarding magnetic field is not correct?

AMagnetic field is a quantity that has direction and magnitude.
BMagnetic field lines are closed curves
CMagnetic field lines are open curves
DNo two magnetic field lines cross each other

Question 19 of 25

Which of the following statements is false?

AThere is repulsion between like poles of a magnet
BThere is attraction between opposite poles of a magnet
CAn isolated pole does not exist
DIf a magnet is broken in half, its two poles separate.

Question 20 of 25

The unit of magnetic flux is-

AWeber
BGauss
CHertz
DTesla

Question 21 of 25

The process by which a metal is made non-magnetic is called-

ADemagnetization
BDegaising
CDigeding
DDegreasing

Question 22 of 25

What is a transformer?

AConverts DC to AC.
BUsed to increase or decrease AC voltage
Cconverts AC voltage to DC voltage
Dconverts electrical energy into mechanical energy

Question 23 of 25

The magnetic effect of electric current was first observed in-

Aby Henry
Bby Ostend
Cby Faraday
DBy Volta

Question 24 of 25

The electric motor works according to the following principle:

AFaraday's laws
BLenz's law
COhm's law
DFleming's Law

Question 25 of 25

The angle which a magnetic needle freely suspended at its centre of gravity makes with the horizontal is called-

Abowing angle
Bsubluxation angle
CHorizontal angle
DNone of these