Magnetism: MCQ Test
50 questions · pick one option for each · submit when you finish to see your score and the correct answers.
Question 1 of 50
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
Question 2 of 50
The unit of magnetic field is-
- AGauss
- BWeber
- CHenry
- Ddomain
Question 3 of 50
The value of the angle of dip at the equator is-
- A0°
- B90°
- C180°
- D45°
Question 4 of 50
Which of the following is not a ferromagnetic substance?
- AIron
- BNickel
- CCopper
- DCobalt
Question 5 of 50
Magnets are an essential part of which of the following household appliances?
- Acalling bell
- Bfan
- Cwashing machine
- DAll of the above
Question 6 of 50
Under what conditions can permanent magnetization be done?
- Airon cast
- Bwrought iron
- Ccast iron
- Dsteel
Question 7 of 50
If a magnet has a third pole, then the third pole is called—
- AAdditional pole
- BRandom poles
- CFaulty pole
- Dresultant pole
Question 8 of 50
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 9 of 50
The process by which a metal is made non-magnetic is called-
- ADemagnetization
- BDegaising
- CDigeding
- DDegreasing
Question 10 of 50
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 11 of 50
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 12 of 50
The unit of magnetic flux is-
- AWeber
- BGauss
- CHertz
- DTesla
Question 13 of 50
The material of which a permanent magnet is made is—
- Aferromagnetic
- Bdiamagnetic
- Cantiferromagnetic
- DThe above three
Question 14 of 50
The axis of a freely hanging magnetic needle makes an angle with the geographical axis-
- Aof 20°
- Bof 16°
- Cof 18°
- Dof 15°
Question 15 of 50
Lenz's law is-
- Aconservation of mass
- Bconservation of momentum
- Cenergy conservation
- Dconservation of mass and energy
Question 16 of 50
Which finger shows the direction of current in Fleming's left hand rule?
- Aindex finger
- Bmiddle finger
- CThumb
- Dring finger
Question 17 of 50
The electric motor works according to the following principle:
- AFaraday's laws
- BLenz's law
- COhm's law
- DFleming's Law
Question 18 of 50
The magnetic effect of electric current was first observed in-
- Aby Henry
- Bby Ostend
- Cby Faraday
- DBy Volta
Question 19 of 50
Which of the following is electromagnetically non-magnetic?
- ANickel
- BCobalt
- CChromium
- Dcopper
Question 20 of 50
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 21 of 50
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 22 of 50
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 23 of 50
The laws of electromagnetic induction have been used to make which of the following?
- Acurrent meter
- BVolt Meter
- Celectric motor
- Dgenerator
Question 24 of 50
The Curie temperature of iron is-
- A450°C
- B575°C
- C635°C
- D780°C
Question 25 of 50
Where is the attractive force of a magnet the greatest?
- Aon both sides
- Bin the middle
- Con the magnetic axis
- DIt is the same everywhere
Question 26 of 50
The working principle of Dyneema (electric generator) is-
- Athermoelectric effect
- Belectromagnetic effect
- Cmagnetic effect of current
- DEnergy conservation
Question 27 of 50
In which direction does a freely suspended magnetic needle rest?
- ANorth-west direction
- BNorth South Direction
- CNorth-East direction
- DSouth-west direction
Question 28 of 50
Why are electromagnets made of soft iron?
- ADue to low magnetic susceptibility and low retentivity
- BDue to high magnetic tendency and low holding capacity
- CDue to high magnetic tendency and high holding capacity
- DDue to low magnetic susceptibility and high holding capacity
Question 29 of 50
Temporary magnets are made from-
- Aof steel
- Bsoft iron
- Ccopper
- DSilver
Question 30 of 50
The number of atoms in 1 domain is-
- A10 12to 1015
- B1015 to 1018
- C10 18to 1021
- D10 21to 1024
Question 31 of 50
Which of the following metals is not attracted by a magnet?
- AIron
- BNickel
- CCobalt
- Daluminium
Question 32 of 50
Which of the following is diamagnetic?
- AIron
- BBismuth
- CNickel
- DCobalt
Question 33 of 50
A magnetic substance can be demagnetized by-
- Aby hammering
- Bheat up
- Cboth of the above
- Dnone of these
Question 34 of 50
Which of the following is a paramagnetic substance?
- Ahydrogen
- Bnitrogen
- Coxygen
- DIron
Question 35 of 50
The principle of transformer is based on-
- Aon the principle of magnetic induction
- Bon the principle of electromagnetic induction
- Con the principle of self-induction
- Don the principle of mutual induction
Question 36 of 50
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 37 of 50
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 38 of 50
A stationary magnet always shows-
- ANorth-North and South-South
- BNorth-South and South-North
- CEast-East and West-West
- Dnone of these
Question 39 of 50
What cannot be used to locate a compass?
- Amagnetic north and south direction
- Bpolarity of magnet
- Cpower of magnet
- Ddirection of magnetic field
Question 40 of 50
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 41 of 50
The angle between the magnetic meridian and the geographical meridian is called-
- Amagnetic inclination
- Bmagnetic moment
- Cmagnetic compass
- Dnone of these
Question 42 of 50
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 43 of 50
Which one of the following is paramagnetic in nature?
- AIron
- Bhydrogen
- Coxygen
- Dnitrogen
Question 44 of 50
What is the value of angle of dip at the poles?
- A0°
- B45°
- C60°
- D90°
Question 45 of 50
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 46 of 50
Which of the following statements is false?
- AThere is a magnetic field around a magnet
- BOstand is credited with the discovery of electromagnetic field.
- CIf the compass needle is kept near a magnet, it does not stop in the north-south direction but gets arranged in a particular direction.
- DA magnetic field is not produced around an electric current.
Question 47 of 50
The ratio of flux density and magnetic field strength in a medium is-
- Amagnetization density
- Breceptivity
- Crelative prevalence
- Dpermeability
Question 48 of 50
What are the numerous microscopic structures of atoms within ferromagnetic materials called?
- Asolenoid
- BToroid
- Cdomain
- DNone of these
Question 49 of 50
Which of the following materials is most suitable for making the core of a transformer?
- Asoft iron
- Bstainless steel
- CCopper
- DNickel
Question 50 of 50
Which way does the needle of a magnetic compass point?
- Amagnetic north
- Bmagnetic south
- Cmagnetic north and magnetic south
- DNone of these