Magnetism and Matter Test

Result

Magnetism and Matter Test - 15

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Weekly Quiz Competition

Question 1
4 / -1

A
If both A and R are correct and R is the correct explantion of A

B
If both A and R are correct but R is not the correct explanation of A

C
If A is correct but R is incorrect

D
If A is incorrect but R is correct

Solution
Question 2
4 / -1

The needle of a deflection galvanometer shows a deflection of 60° due to a short bar magnet at a certain distance in tan A position. If the distance is doubled, then deflection is

A

B

C

D

Solution
Question 3
4 / -1

The magnetic field due to short bar magnet of magnetic dipole moment M and length 2l, on the axis at a distance z (where z >> l)from the centre of the magnet is given by the formula

A

B

C

D

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

A

B

C

D

Solution
Question 6
4 / -1

Two identical thin bar magnets each of length l and pole strength m are placed at right angles to each other, with north pole of one touching south pole of the other, then the magnetic moment of the system is

A
1 ml

B
2 ml

C
√2 ml

D
ml/2

Solution
Question 7
4 / -1

Two short magnets of equal magnetic moments are placed on a piece of cork which floats on water. The magnets are so placed that the axis of one produced bisects the axis of the other at right angles. Then the cork

A
moves bodily only

B
rotates only

C
has neither rotational nor translational motion

D
has rotational as well as translational motion
Question 8
4 / -1

A compass needle is placed at the magnetic pole of earth. It

A
points N-S

B
points EW

C
becomes vertical

D
may stay in any direction
Question 9
4 / -1

A thin bar magnet of length 2 l and breadth 2 b pole strength p and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

A
p

B
p/2

C
2p

D
p/4
Question 10
4 / -1

Magnetic lines of force are

A
continuous

B
discontinuous

C
sometimes continuous and sometimes discontinuous

D
Nothing can be said