Magnetism and Matter Test -11

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Magnetism and Matter Test -11

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Weekly Quiz Competition

Question 1
1 / -0

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

A
flux lines enter one end of a solenoid

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

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

D
solenoid can be broken into two weaker solenoids

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 2
1 / -0

A bar magnet of magnetic moment 2.0 JT^-1 lies aligned with the direction of a uniform magnetic field of 0.25 T. What is the work done to turn the magnet so as to align its magnetic moment opposite to the field direction?

A
0.25 J

B
0.5 J

C
0.75 J

D
1.0 J
Question 3
1 / -0

A paramagnetic substance of susceptibility 3 x 10^-4 is placed in a magnetic field of 4 x 10^-4 Am^-1. What is the intensity (in Am^-1) of magnetisation?

A
1.33 x 10⁸

B
0.75 x 10^-8

C
12 x 10^-8

D
14 x 10^-8

E
1.2 x 10^-8
Question 4
1 / -0

For a paramagnetic material, the dependence of magnetic susceptibility X on absolute temperature T is given by (C is a constant)

A
X = CT

B
X = C/T

C
X = CT²

D
X = C/T^–2
Question 5
1 / -0

The relative permeability of iron is of the order

A
zero

B
1

C
10^–4

D
10³
Question 6
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
North Pole atrracts North Pole.

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

D
South Pole atrracts South Pole.

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 7
1 / -0

The magnetic susceptibility of a material of a rod is 449. Permeability of vacuum is 4π x 10^-7 henry/metre. The absolute permeability of the material of the rod (in henry/metre) is

A
π x 10^-4

B
2π x 10^-4

C
3π x 10^-4

D
4π x 10^-4
Question 8
1 / -0

If a bar magnet of pole strength q and magnetic moment m is divided into two equal pieces by cutting it perpendicular to its length, then

A
q is halved and m is doubled

B
q and m both are halved

C
q is halved, but m remains the same

D
q remains the same, but m is halved
Question 9
1 / -0

A small piece of a material is repelled by a strong magnet. The material is

A
paramagnetic

B
ferromagnetic

C
diamagnetic

D
non-magnetic
Question 10
1 / -0

A dip needle free to move in a vertical plane perpendicular to the magnetic meridian will remain

A
vertical

B
horizontal

C
at an angle of 60° to the vertical

D
at an angle of 45° to the horizontal
Question 11
1 / -0

When a ferromagnetic substance is heated to a temperature above its Curie temperature, it

A
behaves like a paramagnetic substance

B
behaves like a diamagnetic substance

C
remains ferromagnetic

D
is permanently magnetised
Question 12
1 / -0

A needle made of bismuth is suspended freely in a magnetic field. The angle which the needle makes with the magnetic field is

A
0°

B
45°

C
90°

D
180°

E
any angle with which it is placed
Question 13
1 / -0

A frog can be levitated in magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as a/an _______ substance.

A
paramagnetic

B
diamagnetic

C
ferromagnetic

D
anti-ferromagnetic
Question 14
1 / -0

Which of the following statement about magnetic field lines is true?

A
The larger the number of field lines crossing per unit area, the weaker is the magnitude of the magnetic field B.

B
The perpendicular to the field line at a given point gives direction of magnetic field.

C
The magnetic field lines of a magnet (or a solenoid) form continuous closed loops.

D
The smaller the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.

Solution

Outside the solenoid field lines moves from North to South pole, whereas inside it moves from South to North pole.
Question 15
1 / -0

The relative permeability of a substance A is slightly greater than unity, while that of a substance B is slightly less than unity. Which of the following statements is correct?

A
A is ferromagnetic and B is paramagnetic.

B
A is diamagnetic and B is paramagnetic.

C
A is paramagnetic and B is diamagnetic.

D
A and B are both ferromagnetic.
Question 16
1 / -0

A sensitive magnetic instrument can be shielded very effectively from outside fields by placing it inside a box of

A
teak wood

B
plastic material

C
a metal of low magnetic permeability

D
a metal of high magnetic permeability
Question 17
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 18
1 / -0

Susceptibility is large and positive for

A
para magnetic

B
diamagnetic

C
ferro magnetic

D
electromagnetic

Solution

Diamagnetic Paramagnetic ferromagnetic
-1 $$\leq$$ $$\chi$$ < 0 0 < $$\chi$$ < $$\varepsilon$$ $$\chi$$ >>1
$$\chi $$$$=$$magnetic susceptibility
Question 19
1 / -0

Susceptibility is small and positive for

A
para magnetic only

B
diamagnetic only

C
ferro magnetic only

D
Both 1 & 3

Solution

Paramagnetic material $$0< \chi < \varepsilon $$
$$\varepsilon $$ it small, positive and less than one.
$$\chi $$ is suscepticity
Question 20
1 / -0

Curie's law states that magnetic susceptibility is

A
inversely proportional to the absolute temperature

B
exponentially related to temperature

C
directly proportional to the absolute temperature

D
does not depend on temperature

Solution

Curie's law states that,magnetic susceptibility is inversely proportional to the absolute temperature.
M $$=$$ $$\dfrac{CB_{o}}{T}$$ $$M =$$ Magnetic intensity
$$\chi$$ $$=$$ $$\dfrac{C\mu_{o}}{T}$$ $$T=$$ Absolute temperature
$$\chi$$ $$\alpha$$ $$\dfrac{1}{T}$$ $$C=$$ Curie constant
Question 21
1 / -0

From the following ,pick a property that is associated to ferromagnetic materials only :

A
attracting magnetic substance

B
hysterisis

C
directional property

D
susceptibility independent of temperature

Solution

Answer is B

When a ferromagnetic substance is placed in a magnetic field, it is strongly magnetized in the direction of the applied field such that remanance and coercivity is very high
Question 22
1 / -0

Susceptibility is small and negative for

A
para magnetic

B
diamagnetic

C
ferro magnetic

D
electromagnetic

Solution

diamagnetic
$$-1 \leq x < 0$$
$$\chi =susceptibility$$
Question 23
1 / -0

$$\chi _{1}$$and $$\chi _{2}$$ are susceptibilities of a diamagnetic substance at temperatures $$T_{1}K$$ and $$T_{2}K$$ respectively, then,

A
$$\chi _{1}T_{1}=\chi _{2}T_{2}$$

B
$$\chi _{1}=\chi _{2}$$

C
$$\chi _{1}\sqrt{T_{1}}=\chi _{2}\sqrt{T_{2}}$$

D
$$\chi _{1}T_{2}=\chi _{2}T_{1}$$

Solution

$$\chi_{1}$$ $$=$$ $$\chi_{2}$$
The magnetic susceptibility of diamagnetic substance is independent of the temperature.
Question 24
1 / -0

The magnetic force required to demagnetise the material is

A
retentivity

B
coercivity

C
energy loss

D
hysterisis

Solution

Coercivity is the magnetic force required to demagnetise the material.
Question 25
1 / -0

At Curie temperature, in ferromagnetic materials

A
the atomic dipoles get aligned

B
the atomic dipoles remains stationary

C
the atomic dipoles lose alignment

D
magnetism is zero

Solution

Ferromagnetic properties depend upon temperature.
At high temperature atomic dipoles of ferromagnetic material loses their alignment. The Curie temperature is the temperature at which they starts losing their alignment.
Question 26
1 / -0

Hysteresis is shown by which of the following materials

A
paramagnetic only

B
ferromagnetic only

C
diamagnetic only

D
both B and C

Solution

Ferromagnetic only, because only ferromagnetic materials interact with the magnetic field significantly, and magnetize and demagnetize continuously.
Question 27
1 / -0

Ferromagnetism is not found in

A
conductors

B
semiconductors

C
Cobalt

D
gases

Solution

Ferromagnetism is found in semiconductor which has $$\chi$$ >> 1 (For a substance to be ferromagnetic).

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Magnetism and Matter Test -11

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Question 1

flux lines enter one end of a solenoid

there is a current entering and a current leaving a solenoid

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

solenoid can be broken into two weaker solenoids

Solution

Question 2

0.25 J

0.5 J

0.75 J

1.0 J

Question 3

1.33 x 108

0.75 x 10-8

12 x 10-8

14 x 10-8

1.2 x 10-8

Question 4

X = CT

X = C/T

X = CT2

X = C/T–2

Question 5

zero

1

10–4

103

Question 6

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

North Pole atrracts North Pole.

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

South Pole atrracts South Pole.

Solution

Question 7

π x 10-4

2π x 10-4

3π x 10-4

4π x 10-4

Question 8

q is halved and m is doubled

q and m both are halved

q is halved, but m remains the same

q remains the same, but m is halved

Question 9

paramagnetic

ferromagnetic

diamagnetic

non-magnetic

Question 10

vertical

horizontal

at an angle of 60° to the vertical

at an angle of 45° to the horizontal

Question 11

behaves like a paramagnetic substance

behaves like a diamagnetic substance

remains ferromagnetic

is permanently magnetised

Question 12

0°

45°

90°

180°

any angle with which it is placed

Question 13

paramagnetic

diamagnetic

ferromagnetic

anti-ferromagnetic

Question 14

The larger the number of field lines crossing per unit area, the weaker is the magnitude of the magnetic field B.

The perpendicular to the field line at a given point gives direction of magnetic field.

1.33 x 10⁸

0.75 x 10^-8

12 x 10^-8

14 x 10^-8

1.2 x 10^-8

X = CT²

X = C/T^–2

10^–4

10³

π x 10^-4

2π x 10^-4

3π x 10^-4

4π x 10^-4