Magnetism and Matter Test

Result

Magnetism and Matter Test - 22

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The magnetism of magnet is due to

A
The spin motion of electron

B
Earth

C
Pressure of big magnet inside the earth

D
Cosmic rays
Question 2
4 / -1

The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a pointy on the equator of the same magnet. The ratio of the distance of x and y from the centre of the magnet is

A
2^–3

B
2^–1/3

C
2²

D
2^1/3

Solution
Question 3
4 / -1

A magnet of magnetic moment 20 C.G.S. units is freely suspended in a uniform magnetic field of intesity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30° in C.G.S. units is

A
6

B

C

D
3

Solution
Question 4
4 / -1

A bar magnet having centre O has a length of 4 cm. Point P₁ is in the broad side-on and P₂ is in the end side-on position with OP₁ = OP₂ = 10 metres. The ratio of magnetic intensities H at P₁ and P₂ is

A
H₁ : H₂ = 16 :100

B
H₁ : H₂ = 1 : 2

C
H₁ : H₂ = 2 :1

D
H₁ : H₂ = 100 :16
Question 5
4 / -1

The magnetic field due to a short magnet at a point on its axis at distance X cm from the middle point of the magnet is 200 gauss. The magnetic field at a point on the neutral axis at a distance X cm from the middle of the magnet is

A
100 gauss

B
400 gauss

C
50 gauss

D
200 gauss

Solution
Question 6
4 / -1

Which of the following is the most suitable material for making permanent magnet

A
Steel

B
Soft iron

C
Copper

D
Nickel
Question 7
4 / -1

In the case of bar magnet, lines of magnetic induction

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

B
Run continuously through the bar 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
Question 8
4 / -1

A magnet of length 0.1 m and pole strength 10^–4 Am is kept in a magnetic field of 30 WB/m² at an angle 30°. The couple acting on it is…. × 10^–4 Nm.

A
7.5

B
3.0

C
1.5

D
6.0

Solution
Question 9
4 / -1

The field due to a magnet at a distance R from the centre of the magnet is proportional to

A
R²

B
R³

C
1/R²

D
1/R³
Question 10
4 / -1

A uniform magnetic field parallel to the plane of the paper exists in space initially directed from left ro right. When a bar of soft iron is placed in the field paralled to it, the lines of force passing through it will be represented by

A
Figure (A)

B
Figure (B)

C
Figure (C)

D
Figure (D)