Magnetism and Matter Test -4

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Magnetism and Matter Test -4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements about bar magnets is correct?

A
We cannot isolate the north and south pole of a bar magnet.

B
South Pole atrracts South Pole.

C
North Pole atrracts North Pole.

D
We can isolate the north and south pole of a bar magnet.

Solution

As magnetic monopole does not exist. If we split the bar magnet into two pieces each part will have its own north and south pole.
Question 2
1 / -0

When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then,

A
The iron filings form a pattern of suggesting that the magnet has south pole similar to the negative charge

B
The iron filings form a random pattern of suggesting that the magnet has random pole

C
The iron filings form a pattern suggesting that the magnet has two poles similar to the positive and negative charge of an electric dipole

D
The iron filings form a pattern of suggesting that the magnet has north pole similar to the positive charge

Solution

North pole act as positive end and South pole act as negative end. The iron fillings in the presence of magnetic field gets magnetized and form a tiny magnet which then gets attracted to the poles of bar magnet. North pole of bar magnet attracts south pole of tiny magnet and vice-versa. So all the iron fillings are arranged as the magnetic field lines of bar magnet.
Question 3
1 / -0

In which case of comparing solenoid and bar magnet there is no exact similarity?

A
solenoid can be broken into two weaker solenoids

B
moving a small compass needle in the neighbourhood of a solenoid enables tracing the flux lines

C
there is a current entering and a current leaving a solenoid

D
flux lines enter one end of a solenoid

Solution

The solenoid will change the field direction and the magnetic pole polarity as current direction is changed. But, the bar magnet will always have same poles, and it does not change.
Question 4
1 / -0

According to the dipole analogy 1/ε₀ corresponds to

A
μ0

B
1/μ₀

C
πμ₀

D
2μ₀a

Solution

μ₀ in magnetisim is analogous to 1/ε₀ in electricity.
Question 5
1 / -0

According to Gauss’s law for magnetism -

A
The magnetic flux through an open surface is zero.

B
The net magnetic flux through any closed surface is zero.

C
The net magnetic flux through any surface is zero.

D
The net magnetic flux through any closed surface is not zero.

Solution

Total magnetic flux through a closed surface is zero as magnetic monoples do not exist. So the amount of magnetic flux entering a closed surface is equal to amount of magnetic flux leaving the surface.
Question 6
1 / -0

A coil of insulated wire is connected to a battery. If it is taken to galvanometer, its pointer is deflected, because

A
the induced current is produced

B
the coil acts like a magnet

C
the number of turns in the coil of the galvanometer are changed

D
none of these

Solution

When electric current is passed through the coil inside the galvanometer, induction of magnetic field takes place and thus the coil acts like a magnet which experiences torque due to permanent magnet inside galvanometer and thus the pointer is deflected.
Question 7
1 / -0

Identify the correct statement about the magnetic field lines

A
These start from the N-pole and terminate on the S-pole

B
These lines always form closed loops

C
Both (a) and (b) are correct

D
Both (a) and (b) are wrong

Solution

The magnetic field lines of a simple magnet are shown in the picture below.They point from the north pole to the south pole. However, the magnetic field lines do not just end at the tip of the magnet. They go right through it, so that inside the magnet the magnetic field points from the south pole to the north pole.
Magnetic field lines form closed loops since magnetic monopoles doesn't exist unlike an electric charge.
Question 8
1 / -0

A moving conductor coil produces an induced em.f. This is in accordance with

A
Lenz's law

B
Faraday's law

C
Coulomb's law

D
Ampere's law

Solution

Faraday's Law states that when the magnetic flux linking a circuit changes, an electromotive force is induced in the circuit proportional to the rate of change of the flux linkage.
This results in a moving conductor coil producing EMF.
Question 9
1 / -0

Lenz's law is a consequence of the law of conservation of

A
charge

B
mass

C
energy

D
momentum

Solution

HINT : Lenz’s law of electromagnetic induction corresponding to the law of conservation of energy.
$$\textbf{Step 1:Lenz's Law}$$
The induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that original flux is maintained through the loop when current flows in it.
Lenz’s law depends on the principle of conservation of energy and Newton’s third law.
Thus, option C is correct.
Question 10
1 / -0

A watch glass containing some powdered substance is placed between the pole pieces of a magnet. Deep concavity is observed at the centre. The substance in the watch glass is

A
iron

B
chromium

C
carbon

D
wood

Solution

Iron is a ferromagnetic substance the property which makes it attach to magnets. This causes the concavity. Chromium is anti-ferromagnetic, wood and carbon are not magnetic materials.
Question 11
1 / -0

A superconductor exhibits perfect:

A
ferrimagnetism

B
ferromagnetis

C
paramagnetism

D
diamagnetism

Solution

A superconductor exhibits perfect diamagnetism.
Question 12
1 / -0

The magnetic materials having negative magnetic susceptibility are

A
non-magnetic

B
para magnetic

C
dia magnetic

D
ferro magnetic

Solution

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetisation of a material in response to an applied magnetic field.
Substances such as copper, iron have negative susceptibility as these substances are diamagnetic substances.
Substances with negative susceptibility signifies that they are repelled by magnets.
Question 13
1 / -0

For protecting a sensitive equipment from external magnetic field, it should be

A
placed inside an iron can

B
placed inside an aluminium can

C
surrounded with fine copper sheet

D
wrapped with insulation around it when passing current through it

Solution

Iron is a ferromagnetic substance, so there are no magnetic lines of force inside it. So to protect the sensitive equipment from external magnetic field, it should be placed inside an iron can.
Question 14
1 / -0

Which of the following statements is wrong ? Magnetic lines of force

A
Form closed circuits

B
Never intersect

C
Are densest near the poles

D
None of the above

Solution

All the facts are correct.
Magnetic lines of force closed loops, and they never intersect.
Also they are densest at poles which means that the magnetic field is stronger at the poles.
Question 15
1 / -0

When a bar magnet is broken into two pieces:

A
we will have a single pole on each piece

B
each piece will have two unlike poles

C
each piece will have two like poles

D
none of these

Solution

When we break a magnet into two, both act as magnets, that is both have a north and south pole each. In both these pieces the corresponding north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must get oppositely polarized.

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Magnetism and Matter Test -4

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Question 1

We cannot isolate the north and south pole of a bar magnet.

South Pole atrracts South Pole.

North Pole atrracts North Pole.

We can isolate the north and south pole of a bar magnet.

Solution

Question 2

The iron filings form a pattern of suggesting that the magnet has south pole similar to the negative charge

The iron filings form a random pattern of suggesting that the magnet has random pole

The iron filings form a pattern suggesting that the magnet has two poles similar to the positive and negative charge of an electric dipole

The iron filings form a pattern of suggesting that the magnet has north pole similar to the positive charge

Solution

Question 3

solenoid can be broken into two weaker solenoids

moving a small compass needle in the neighbourhood of a solenoid enables tracing the flux lines

there is a current entering and a current leaving a solenoid

flux lines enter one end of a solenoid

Solution

Question 4

μ0

1/μ0

πμ0

2μ0a

Solution

Question 5

The magnetic flux through an open surface is zero.

The net magnetic flux through any closed surface is zero.

The net magnetic flux through any surface is zero.

The net magnetic flux through any closed surface is not zero.

Solution

Question 6

the induced current is produced

the coil acts like a magnet

the number of turns in the coil of the galvanometer are changed

none of these

Solution

Question 7

These start from the N-pole and terminate on the S-pole

These lines always form closed loops

Both (a) and (b) are correct

Both (a) and (b) are wrong

Solution

Question 8

Lenz's law

Faraday's law

Coulomb's law

Ampere's law

Solution

Question 9

charge

mass

energy

momentum

Solution

Question 10

iron

chromium

carbon

wood

Solution

Question 11

ferrimagnetism

ferromagnetis

paramagnetism

diamagnetism

Solution

Question 12

non-magnetic

para magnetic

dia magnetic

ferro magnetic

Solution

1/μ₀

πμ₀

2μ₀a