Magnetism and Matter Test -13

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Magnetism and Matter Test -13

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Weekly Quiz Competition

Question 1
1 / -0

If a diamagnetic solution is poured into a U-tube and one arm of this U-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will

A
Rise

B
Fall

C
Oscillate slowly

D
Remain as such

Solution

Because, diamagnetic substance moves from stronger magnetic field to weaker field
Question 2
1 / -0

Which of the following is true?

A
Diamagnetism is temperature dependent

B
Paramagnetism is temperature dependent

C
Paramagnetism is temperature independent

D
None of these

Solution

With rise in temperature their magnetic susceptibility decreases

χm ∝ 1/T
Question 3
1 / -0

The magnetic field of earth is due to

A
Motion and distribution of some material in and outside the earth

B
Interaction of cosmic rays with the current of earth

C
A magnetic dipole buried at the centre of the earth

D
Induction effect of the sun

Solution

Electrical currents flowing in the slowly moving molten iron generate the magnetic field. In addition to sources in the Earth's core the magnetic field observable at the Earth's surface has sources in the crust and in the ionosphere and magnetosphere.
Question 4
1 / -0

Assertion: We cannot think of magnetic field configuration with three poles.

Reason: A bar magnet does exert a torque on itself due to its own field

A
If both assertion and reason are true and the reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false

D
If the assertion and reason both are false

Solution

It is quite clear that magnetic poles always exist in pairs. Since, one can imagine magnetic field configuration with three poles.

When north poles or south poles of two magnets are glued together. They provide a three pole field configuration. It is also known that a bar magnet does not exert a torque on itself due to own its field.
Question 5
1 / -0

Isogonic lines on magnetic map will have

A
Zero angle of dip

B
Zero angle of declination

C
Same angle of declination

D
Same angle of dip

Solution

Isogonic lines on magnetic map will have same angle of declination.
Question 6
1 / -0

Choose the correct alternative, in relation to properties of magnetic lines of force.

A
Magnetic lines of force start from south pole and end on north pole

B
Magnetic lines of force intersect each other at the poles

C
Magnetic lines of force are far from each other where the field is strong

D
Tangent at any point on the magnetic lines of force gives the direction of the magnetic field at that point.

Solution

Magnetic line of forces are closed continuous curves which start from the north pole and end at the south pole of the magnet. A tangent at any point on the magnetic line of forces gives the direction of the magnetic field at that point. Thus no two magnetic field lines intersect with each other as it would give two different directions of magnetic field at that point which is impossible. Also magnetic line of forces are nearer to each other where the magnetic field is strong and vice-versa.
Hence statement given in option D is correct.
Question 7
1 / -0

In case of a bar magnet, lines of magnetic induction

A
start from the north pole and end at the south pole

B
run continuously through the bar magnet and outside

C
emerge in circular paths from the middle of the bar

D
are produced only at the north pole like rays of light from a bulb

Solution

Magnetic lines of force in a bar magnet are continuous forming closed loops as shown in the figure.
Outside the magnet, the lines run from north pole to south pole whereas oppositely inside.
Question 8
1 / -0

Assertion (A): A magnet remains stable, If it aligns itself with the field
Reason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true and R is not correct explanation of A.

C
A is true, But R is false

D
A is false, But R is true

Solution

The magnet remains stable,if it align itself with the field as its potential will be minimum in that position.
$$\mu=-\vec{M}.\vec{B}$$
=$$-MB\cos \Theta $$

The potential energy will be minimum if
$$\Theta =0$$
i.e. $$-MB$$

$$\therefore $$ If it is parallel to magnet field
Question 9
1 / -0

The relative permeability is represented by$$\mu _{r}$$ and susceptibility is denoted by $$\chi $$ for a magnetic substance then for a paramagnetic substance.

A
$$\mu _{r} < 1,\chi < 0$$

B
$$\mu _{r} < 1,\chi > 0$$

C
$$\mu _{r} > 1,\chi < 0$$

D
$$\mu _{r} > 1,\chi > 0$$

Solution

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field.
$$M=\chi H$$
where, $$M$$ is the magnetization of material, $$H$$ is the magnetic field strength.
Therefore, $$\chi>0$$
Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.
$$B=\mu H$$
where, $$B$$ is magnetic field, $$H$$ is auxiliary magnetic field.
$$\mu>\mu_0$$
$$\mu_r=\dfrac{\mu}{\mu_0}>1$$
Question 10
1 / -0

Ferromagnetic ore properties are due to

A
filled inner sub-shells

B
vacant inner sub-shells

C
partially filled inner sub-shells

D
all the sub-shells equally filled

Solution

Partially filled inner sub-shells,due to the magnetic moment of unpaired electrons in partially filled inner sub-shells which got align in a particular direction in the presence of external magnetic field.
Question 11
1 / -0

Permanent magnets are made from

A
diamagnetic substances

B
paramagnetic substance

C
ferromagnetic substances

D
wood

Solution

Ferromagnetic substance, Because they get magnetize in external magnetic field and don't lose their magnetic property.
Question 12
1 / -0

Out of dia, para and ferromagnetism, the universal property of all substances is

A
diamagnetism

B
paramagnetism

C
ferromagnetism

D
antiferromagnetism

Solution

Diamagnetic materials create an induced magnetic field in a direction opposite to an externally applied magnetic field, and are repelled by the applied magnetic field. In contrast, the opposite behavior is exhibited by paramagnetic materials. Ferromagnetic substances having a high susceptibility to magnetization.
Question 13
1 / -0

Assertion (A) : To protect any instrument from external magnetic field, it is put inside an iron box
Reason (R) : Iron is a ferromagnetic substance

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true and R is not correct explanation of A

C
A is true, but R is false

D
A is false, but R is true

Solution

To protect any instrument from external magnetic field it is put inside an iron box as iron is a ferromagnetic substance it will not get magnetize by the magnetic field due which there will not be any effect of magnetic field on the instrument.
Question 14
1 / -0

A compass needle, which shows the direction at the earth's magnetic pole is

A
Vertical

B
No particular direction

C
Bent at 45$$^{0}$$ to the vertical

D
Horizontal

Solution

For a compass to show the direction of magnetic pole moment , they must be placed at ether of the $$2$$ geographic poles . It is because the direction of magnetic moment is from south to north pole.
The compass therefore will be vertical at both the poles.
Question 15
1 / -0

The relative permeability of silicon is $$0.99837$$ and that of palladium is $$1.00692$$, choose the correct option from the following :

A
silicon is paramagnetic and palladium is ferromagnetic

B
silicon is ferromagnetic and palladium is paramagnetic

C
silicon is diamagnetic and palladium is paramagnetic

D
Both are paramagnetic

Solution

Diamagnetic           Paramagnetic             Ferromagnetic
-1 $$\leq$$ $$\chi$$ < 0        0 < $$\chi$$ < $$\varepsilon$$          $$\chi$$ >> 1
0 $$\leq$$ $$\mu_{r}$$ < 1     1 < $$\mu_{r}$$ < 1+ $$\varepsilon$$     $$\mu_{r}$$ >> 1
$$\chi$$ $$=$$ magnetic susceptibility
$$\mu_{r}$$ $$=$$ relative permeability.
$$\varepsilon$$ < 1 and small.

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Magnetism and Matter Test -13

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Magnetism and Matter Test -13

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Question 1

Rise

Fall

Oscillate slowly

Remain as such

Solution

Question 2

Diamagnetism is temperature dependent

Paramagnetism is temperature dependent

Paramagnetism is temperature independent

None of these

Solution

Question 3

Motion and distribution of some material in and outside the earth

Interaction of cosmic rays with the current of earth

A magnetic dipole buried at the centre of the earth

Induction effect of the sun

Solution

Question 4

If both assertion and reason are true and the reason is the correct explanation of the assertion

If both assertion and reason are true but reason is not the correct explanation of the assertion

If assertion is true but reason is false

If the assertion and reason both are false

Solution

Question 5

Zero angle of dip

Zero angle of declination

Same angle of declination

Same angle of dip

Solution

Question 6

Magnetic lines of force start from south pole and end on north pole

Magnetic lines of force intersect each other at the poles

Magnetic lines of force are far from each other where the field is strong

Tangent at any point on the magnetic lines of force gives the direction of the magnetic field at that point.

Solution

Question 7

start from the north pole and end at the south pole

run continuously through the bar magnet and outside

emerge in circular paths from the middle of the bar

are produced only at the north pole like rays of light from a bulb

Solution

Question 8

Both A and R are true and R is the correct explanation of A.

Both A and R are true and R is not correct explanation of A.

A is true, But R is false

A is false, But R is true

Solution

Question 9

$$\mu _{r} < 1,\chi < 0$$

$$\mu _{r} < 1,\chi > 0$$

$$\mu _{r} > 1,\chi < 0$$

$$\mu _{r} > 1,\chi > 0$$

Solution

Question 10

filled inner sub-shells

vacant inner sub-shells

partially filled inner sub-shells

all the sub-shells equally filled

Solution

Question 11

diamagnetic substances

paramagnetic substance

ferromagnetic substances

wood

Solution

Question 12

diamagnetism

paramagnetism

ferromagnetism

antiferromagnetism

Solution