Welcome to the Science Quiz 133

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

120

An electromagnetic field exists only when there is?

An increasing current

Decreasing current

Voltage

Current

Correct! Wrong!

The most effective and quickest may of making a magnet from soft iron is by?

Placing it inside a coil carrying current

The use of permanent magnet

Rubbing with another magnet

None

Correct! Wrong!

When a solenoid is activated, the force that moves the plunger is?

A steady current

Varying voltage

A permanent magnetic field

An electromagnetic field

Correct! Wrong!

When the current through the coil of an electromagnet reverses, the?

Magnetic field collapses

Magnetic field expands

Direction of the magnetic field remains unchanged

Direction of the magnetic field reverses

Correct! Wrong!

Paramagnetic materials have relative permeability?

Slightly less than unity

Equal to that ferromagnetic mate rails

Slightly more than unity

Equal to unity

Correct! Wrong!

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage?

Reverses polarity

Increases

Decreases

None

Correct! Wrong!

A keeper is used to?

Change the direction of magnetic lines

Restore lost flux

Provide a closed path for flux

None

Correct! Wrong!

When the north poles of two bar magnets are brought close together, there will be?

No force

A downward force

A force of attraction

A force of repulsion

Correct! Wrong!

Science Quiz 133

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Welcome to the Science Quiz 133

An electromagnetic field exists only when there is?

The most effective and quickest may of making a magnet from soft iron is by?

When a solenoid is activated, the force that moves the plunger is?

When the current through the coil of an electromagnet reverses, the?

Paramagnetic materials have relative permeability?

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage?

A keeper is used to?

When the north poles of two bar magnets are brought close together, there will be?

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