Magnetism: MCQ Test (25 questions)

Question 1 of 25

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

Acurrent meter
BVolt Meter
Celectric motor
Dgenerator

Question 2 of 25

The working principle of 'dynamo' is related to which of the following?

AIt converts attention energy into mechanical energy.
BIt converts electrical energy into mechanical energy
CIt converts electrical energy into sound energy
DIt converts mechanical energy into electrical energy

Question 3 of 25

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

Asolenoid
BToroid
Cdomain
DNone of these

Question 4 of 25

Which way does the needle of a magnetic compass point?

Amagnetic north
Bmagnetic south
Cmagnetic north and magnetic south
DNone of these

Question 5 of 25

A powerful magnet

Aattracts all substances
BAttracts only iron and its alloys
CAttracts only iron and its alloys, but does not repel any other metal.
Dattracts some substances, repels others

Question 6 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 7 of 25

Which one of the following is paramagnetic in nature?

AIron
Bhydrogen
Coxygen
Dnitrogen

Question 8 of 25

The Curie temperature of iron is-

A450°C
B575°C
C635°C
D780°C

Question 9 of 25

The working principle of Dyneema (electric generator) is-

Athermoelectric effect
Belectromagnetic effect
Cmagnetic effect of current
DEnergy conservation

Question 10 of 25

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

Amagnetization density
Breceptivity
Crelative prevalence
Dpermeability

Question 11 of 25

A magnetic substance can be demagnetized by-

Aby hammering
Bheat up
Cboth of the above
Dnone of these

Question 12 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 13 of 25

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

Asoft iron
Bstainless steel
CCopper
DNickel

Question 14 of 25

Which of the following is electromagnetically non-magnetic?

ANickel
BCobalt
CChromium
Dcopper

Question 15 of 25

The axis of a freely hanging magnetic needle makes an angle with the geographical axis-

Aof 20°
Bof 16°
Cof 18°
Dof 15°

Question 16 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

Question 17 of 25

The unit of magnetic field is-

AGauss
BWeber
CHenry
Ddomain

Question 18 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 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

Which of the following is diamagnetic?

AIron
BBismuth
CNickel
DCobalt

Question 21 of 25

Which finger shows the direction of current in Fleming's left hand rule?

Aindex finger
Bmiddle finger
CThumb
Dring finger

Question 22 of 25

What is the value of angle of dip at the poles?

A0°
B45°
C60°
D90°

Question 23 of 25

The value of the angle of dip at the equator is-

A0°
B90°
C180°
D45°

Question 24 of 25

It is difficult to magnetize steel because its-

ABecause of its low magnetic
BDue to the high carrying capacity
CBecause of its high magnetic
DDue to the high density

Question 25 of 25

If a magnet is divided into two parts then-

ABoth parts become separate magnets.
BOne part becomes magnetized and the other part becomes non-magnetic.
COne part becomes the North Pole and the other part becomes the South Pole.
DBoth parts become non-magnetic