Magnetism and Matter Test

Result

Magnetism and Matter Test - 19

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Weekly Quiz Competition

Question 1
4 / -1

The variation of magnetic susceptibility (χ) with absolute temperature T for a ferromagnetic is given in Fig. by

A

B

C

D

Solution
Question 2
4 / -1

Which of the following has low value for ferrite?

A
Conductivity

B
Permeability

C
Susceptibility

D
None of these
Question 3
4 / -1

A magnetizing field of 2×10³ amp/m produces a magnetic flux density of 8π tesla in an iron rod. The relative permeability of the rod will be

A
10²

B
10^o

C
10³

D
10⁴

Solution
Question 4
4 / -1

A magnetic needle suspended by a silk thread is vibrating in the earth’s magnetic field. If the temperature of the needle is increased by 700ºC, then

A
time period decreases

B
time period increases

C
time period remains unchanged

D
the needle stops vibrating
Question 5
4 / -1

At the magnetic north pole of the earth, the value of the horizontal component of earth’s magnetic field and angle of dip are respectively

A
zero, maximum

B
maximum, minimum

C
maximum, maximum

D
minimum, minimum
Question 6
4 / -1

Two identical magnetic dipoles of magnetic moments 1.0 A-m² each, placed at a separation of 2 m with their axes perpendicular to eachother. The resultant magnetic field at a point midway between the dipole is

A

B

C

D

Solution
Question 7
4 / -1

Using a bar magnet P, a vibration magnetometer has time period 2 seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true?

A
Q is of non-magnetic material

B
Q is a bar magnet identical to P, and its north pole is placed on top of P’s north pole

C
Q is of unmagnetised ferromagnetic material

D
Nothing can be said about properties of Q

Solution
Question 8
4 / -1

A certain amount of current when flowing in a properly set tangent galvanometer produces a deflection of 45^o. If the current be reduced by a factor of √3, the deflection would

A
decrease by 30º

B
decrease by 15º

C
increase by 15º

D
increase by 30º

Solution
Question 9
4 / -1

The magnetic field due to a small magnetic dipole of magnetic moment M, at distance r from the centre on equatorial line is given by

A

B

C

D

Solution
Question 10
4 / -1

A bar magnet, of magnetic moment M, is placed in a magnetic field of induction B. The torque exerted on it is

A

B

C

D

Solution