Magnetism and Matter Test

Result

Magnetism and Matter Test - 17

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Weekly Quiz Competition

Question 1
4 / -1

The vertical component of earth’s magnetic field is zero at

A
magnetic equator

B
magnetic pole

C
geographic poles

D
at 90º latitude
Question 2
4 / -1

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

A
horizontal

B
vertical

C
neither horizontal nor vertical

D
none of the above

Solution
Question 3
4 / -1

The arms of a deflection magnetometer in the tangent B position are placed along

A
the east west direction

B
the north south direction

C
the north east-south west direction

D
the north west-south east direction
Question 4
4 / -1

A
B = H

B
B cos θ = H sin θ

C
B sin θ = H cos θ

D
B = H tan θ

Solution
Question 5
4 / -1

A dip needle arranged to move freely in the magnetic meridian dips by an angle θ. If the vertical plane in which the needle moves is rotated through an angle α to the magnetic meridian, then the needle will dip by an angle

A
θ

B
Α

C
More than θ

D
Less than θ

Solution
Question 6
4 / -1

The period of oscillation of a magnet in a vibration magnetometer is 2 seconds. The period of oscillation of a magnet whose magnetic moment is sixteen times that of the first magnet is

A
1 sec

B
4 sec

C
8 sec

D
0.5 sec

Solution
Question 7
4 / -1

Two short magnets have equal pole strengths but one is twice as long as the other. The shorter magnet is placed 20 cm in tan A position from the compass needle. The longer magnet must be placed on the other side of the magnetometer for no deflection at a distance equal to

A
20 cm

B
20 (2)^1/3 cm

C
20 (2)^2/3 cm

D
20 (2)^3/3 cm

Solution
Question 8
4 / -1

The magnetic needle of an oscillation magnetometer makes 10 oscillations per minute under the action of earth’s magnetic field alone. When a bar magnet is placed at some distance along the axis of the needle, it makes 14 oscillations per minute. If the bar magnet is turned so that its poles interchange their positions, then the new frequency of oscillation of the needle is

A
10 vibrations per minute

B
14 vibrations per minute

C
4 vibrations per minute

D
2 vibrations per minute

Solution
Question 9
4 / -1

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 second. The same needle is then allowed to vibrate in the horizontal plane, and the time period is again found to be 2 second. Then the angle of dip is

A
0º

B
30º

C
45º

D
90º

Solution
Question 10
4 / -1

A magnetic needle suspended horizontally by an unspun silk fibre oscillates in the horizontal plane, because of the restoring force originating mainly from

A
the torsion of the silk fibre

B
the horizontal component of earth’s magnetic field

C
the force of gravity

D
all the above factors