Science Quiz 85

This is a timed quiz. You will be given 120 seconds to answer all questions. Are you ready?

120

The relative permeability of materials is not constant

ferromagnetic

paramagnetic

diamagnetic

none

Correct! Wrong!

The materials having low retentivity are suitable for making

weak magnets

heating magnets

permanent magnets

temporary magnets

Correct! Wrong!

The unit of flux is the same as that of

pole strength

reluctance

permeance

resistance

Correct! Wrong!

A permanent magnet

attracts only ferromagnetic substances

attracts all paramagnetic substances and repels others

attracts some substances and repels others

none

Correct! Wrong!

A keeper is used to

change the direction of magnetic lines

provide a closed path for flux

amplify flux

restore lost flux

Correct! Wrong!

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Is zero

Increases

Decreases

none

Correct! Wrong!

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

non-magnetic substances

permanent magnets

transformers

electromagnets

Correct! Wrong!

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

triangular

circular

both (a) & (b)

rectangular

Correct! Wrong!

Science Quiz 85

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