Science Quiz 99

This is a timed quiz. You will be given 15 seconds per question. Are you ready?

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

Non-magnetic substances

Transformers

Permanent magnets

Electromagnets

Correct! Wrong!

Magnetism of a magnet can be destroyed by?

Hammering

By inductive action of another magnet

By all above methods

None

Correct! Wrong!

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

Ferromagnetic materials

Paramagnetic materials

Diamagnetic materials

Ferrites

Correct! Wrong!

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

It assures a position right angle to magnetic field

It starts rotating

Both (A)& (B)

It assures a position which follows a line of magnetic flux

Correct! Wrong!

Ferrites are materials?

Paramagnetic

Diamagnetic

Both (a) & (b)

Ferromagnetic

Correct! Wrong!

A keeper is used to?

Change the direction of magnetic lines

Amplify flux

Restore lost flux

Provide a closed path for flux

Correct! Wrong!

Materials subjected to rapid reversal of magnetism should have?

High permeability and low hysteresis loss

High coercivity and low density

High coercivity and high retentivity

None

Correct! Wrong!

A material which is slightly repelled by a magnetic field is known as?

Diamagnetic material

Paramagnetic material

Diamagnetic material

None

Correct! Wrong!

Science Quiz 99

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Science Quiz 99

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

Magnetism of a magnet can be destroyed by?

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

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

Ferrites are materials?

A keeper is used to?

Materials subjected to rapid reversal of magnetism should have?

A material which is slightly repelled by a magnetic field is known as?

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Science Quiz 99

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

Magnetism of a magnet can be destroyed by?

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

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

Ferrites are materials?

A keeper is used to?

Materials subjected to rapid reversal of magnetism should have?

A material which is slightly repelled by a magnetic field is known as?

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Science Quiz 98

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