Magnetism and Matter Test

Result

Magnetism and Matter Test - 33

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Question 1
4 / -1

At two places A and B using vibration magnetometer, a magnet vibrates in a horizontal plane and its respecitve periodic time are 2 sec and 3 sec and at these places the earth\'s horizontal components are H_A and H_B respectively. Then the ratio between H_A and H_B will be

A
9 : 4

B
3 : 2

C
4 : 9

D
2 : 3

Solution
Question 2
4 / -1

The time period of a bar magnet suspended horizontally in the earth\'s magnetic field and allowed to oscillate

A
Is directly proportional to the square root of its mass

B
Is directly proportional to its pole strength

C
Is inversely proportional to its magnetic moment

D
Decreases if the length increases but pole strength remains same

Solution
Question 3
4 / -1

A

B

C

D

Solution
Question 4
4 / -1

A small bar magnet A oscillates in a horizontal plane with a period T at a place where the angle of dip is 60°. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be

A

B
T

C

D
2T

Solution
Question 5
4 / -1

Vibration magnetometer works on the principle of

A
Torque acting on the bar magnet

B
Force acting on the bar magnet

C
Both the force and the torque acting on the bar magnet

D
None of the above
Question 6
4 / -1

Tangent galvanometer is used to measure

A
Steady currents

B
Current impulses

C
Magnetic moments of bar magnets

D
Earth's magnetic field
Question 7
4 / -1

A tangent galvanometer has a coil with 50 turns and radius equal to 4 cm. A current of 0.1 A is passing through it. The plane of the coil is set parallel to the earth\'s magnetic meridian. If the value of the earth\'s horizontal component of the magnetic field is 7 × 10^–5 tesla and µ₀ = 4π × 10^–7 weber/amp × m, then the deflection in the galvanometer needle will be

A
45°

B
48.2°

C
50.7°

D
52.7°

Solution
Question 8
4 / -1

A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T’, then ratio T’ /T is

A

B

C

D
2

Solution
Question 9
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 500°C, then

A
The time period decreases

B
The time period remains unchanged

C
The time period increases

D
The needle stops vibrating

Solution
Question 10
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 unmagnetized ferromagnetic material

D
Nothing can be said about Q' s properties

Solution