electrical

Magnetism and Electromagnetism MCQ Page - 2

1.

Susceptibility is positive for

Answer/ Hint      

Answer : C

Explanation :

2.

Two long parallel conductors carry 100 A. if the conductors are separated by 20 mm, the force per meter of length of each conductor will be

Answer/ Hint      

Answer : D

Explanation :

3.

The tubes of force within the magnetic materials are known as

Answer/ Hint      

Answer : B

Explanation :

4.

The unit of flux is same as that of

Answer/ Hint      

Answer : D

Explanation :

5.

Unit of quantity of electricity is

Answer/ Hint      

Answer : D

Explanation :

6.

The Biot-savart’s law is a general modification of

Answer/ Hint      

Answer : C

Explanation :

7.

The most effective and quickest way of making magnet from soft iron is by

Answer/ Hint      

Answer : A

Explanation :

8.

The commonly used material for shielding or screening magnetism is

Answer/ Hint      

Answer : C

Explanation :

9.

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity

Answer/ Hint      

Answer : D

Explanation :

10.

A permanent magnet

Answer/ Hint      

Answer : A

Explanation :

11.

The retentivity (a property) of material is useful for construction of

Answer/ Hint      

Answer : A

Explanation :

12.

The relative permeability of ………… a material is not constant

Answer/ Hint      

Answer : C

Explanation :

13.

The ………. Materials are a bit inferior conductor of magnetic flux than air.

Answer/ Hint      

Answer : C

Explanation :

14.

Hysteresis loop in case of magnetically hard materials is more …….. in shape as compared to magnetically soft materials.

Answer/ Hint      

Answer : C

Explanation :

15.

A rectangular magnet of magnetic moment M is cut into two pieces of same length, the magnetic moment of each piece will be

Answer/ Hint      

Answer : B

Explanation :

16.

A keeper is used to

Answer/ Hint      

Answer : D

Explanation :

17.

Magnetic moment is a

Answer/ Hint      

Answer : D

Explanation :

18.

The change of cross-sectional area of conductor in magnetic field will affect

Answer/ Hint      

Answer : C

Explanation :

19.

The uniform magnetic field is

Answer/ Hint      

Answer : C

Explanation :

20.

The magneto-motive force is

Answer/ Hint      

Answer : C

Explanation :

21.

What will be the current passing through the ring-shaped air cored coil when numbers of turns is 800 and amperes turns are 3200?

Answer/ Hint      

Answer : B

Explanation :

22.

What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?

Answer/ Hint      

Answer : B

Explanation :

23.

A certain amount of current flows through a ring-shaped coil with fixed numbers of turns. How the magnetic induction B does varies inside the coil if an iron core is threaded into coil without dimensionless change of coil?

Answer/ Hint      

Answer : B

Explanation :

24.

The magnetic reluctance of materials

Answer/ Hint      

Answer : A

Explanation :

25.

The initial permeability of an iron rod is

Answer/ Hint      

Answer : D

Explanation :

26.

Which path of the magnetic path requires largest m.m.f?

Answer/ Hint      

Answer : A

Explanation :

27.

How does the magnetic compass needle behave in a magnetic field?

Answer/ Hint      

Answer : C

Explanation :

28.

In a simple magnetic field the strength of magnetic flux

Answer/ Hint      

Answer : A

Explanation :

29.

The stray line of magnetic flux is defined as

Answer/ Hint      

Answer : D

Explanation :

30.

The bar magnet has

Answer/ Hint      

Answer : A

Explanation :

31.

Which of the following materials are diamagnetic?

Answer/ Hint      

Answer : C

Explanation :

32.

Which of the following type of materials are not very important for engineering applications?

Answer/ Hint      

Answer : C

Explanation :

33.

The susceptibility of paramagnetic materials generally lies between

Answer/ Hint      

Answer : A

Explanation :

34.

For which of the following material of saturation value is highest?

Answer/ Hint      

Answer : D

Explanation :

35.

The magnetic materials exhibit the property of magnetisation because of

Answer/ Hint      

Answer : D

Explanation :

36.

For which of the following materials the net magnetic moment should be zero?

Answer/ Hint      

Answer : C

Explanation :

37.

The attraction capacity of electromagnet will increase if the

Answer/ Hint      

Answer : D

Explanation :

38.

Which of the following statement is correct?

Answer/ Hint      

Answer : A

Explanation :

39.

The magnetisation and applied field in ferromagnetic materials are related

Answer/ Hint      

Answer : C

Explanation :

40.

 In which of the materials the spin moments associated with two sets of atoms are aligned antiparallel to each other?

Answer/ Hint      

Answer : D

Explanation :

41.

Temporary magnets are used in

Answer/ Hint      

Answer : D

Explanation :

42.

Strength of electromagnet can be increased by

Answer/ Hint      

Answer : D

Explanation :

43.

Core of electromagnet should have

Answer/ Hint      

Answer : C

Explanation :

44.

Magnetism of a magnet can be destroyed by

Answer/ Hint      

Answer : D

Explanation :

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