Quiz on Electric current and its Effect

Welcome to your Class 7 Electric Effects and Current

A bulb connected to a circuit does not glow even though wires and bulb are intact. What is the most logical cause?

Circuit is open

Resistance is zero

Bulb is too bright

None

Cells connected in series produce more brightness in a bulb because they:

Decrease current

Increase voltage

Increase resistance

None

Which material would be most suitable for making a heating element?

Nichrome

Copper

Aluminium

None

Why do connecting wires in a circuit not glow like bulb filaments?

They have no current

They have no electrons

They have low resistance

None

A fuse wire melts when current exceeds limit. This happens because fuse wire has:

Zero resistance

Low melting point

High melting point

None

If live and neutral wires touch directly, the current becomes very large. This condition is called:

Insulation

Short circuit

Overloading

None

A compass needle placed near a current-carrying wire deflects. This demonstrates:

Chemical effect

Heating effect

Magnetic effect

None

Why does reversing current direction reverse compass deflection?

Magnetic field direction changes

Wire thickness changes

Resistance changes

None

Which factor will increase the strength of an electromagnet?

Increasing current

Removing iron core

Reducing number of turns

None

An electromagnet is preferred over permanent magnet in cranes because it:

Is lighter

Is stronger always

Can be switched off

None

Which statement correctly compares conductors and insulators?

Insulators allow easy flow

Conductors allow current easily

Conductors oppose current strongly

None

Increasing resistance in a wire while keeping current same will:

Decrease heat produced

Stop heat production

Increase heat produced

None

Why is tungsten used in bulb filaments?

High melting point

No resistance

Low melting point

None

Overloading in a circuit occurs when:

Wire length is small

Too few appliances are connected

Too many appliances draw current

None

If a circuit is closed but no source is present, current will:

Not Flow

Flow only in wires

Flow slowly

None

Which property of a wire mainly determines its resistance?

Shape only

Length and thickness

Colour

None

Which change will make a bulb glow brighter?

Increasing number of cells in series

Increasing wire resistance

Decreasing voltage

None

Why is rubber used to cover electric wires?

It increases voltage

It is an insulator

It conducts current

None

A solenoid behaves like a magnet because:

It stores electricity

It has iron ends

Current in coil produces magnetic field

None

What happens when switch is OFF in a circuit?

Circuit becomes open

Resistance becomes zero

Voltage increases

None

Which device works mainly on heating effect of current?

Electric motor

Electric iron

Compass

None

If resistance of a wire decreases, heat produced will:

Remain same

Increase

Decrease

None

Why is an iron core placed inside a coil to make an electromagnet?

To increase magnetic strength

To decrease resistance

To reduce current

None

Which condition is necessary for current to flow?

Long wire only

Closed path

Thick wire only

None

A bulb glows dimly instead of brightly. This indicates:

Higher current

Lower current

Zero resistance

None

MCB is preferred over fuse because MCB:

Conducts more current

Cannot break circuit

Can be reset

None

Which situation produces maximum heat in a wire?

High current and high resistance

Low current and low resistance

No current

None

Why does a short circuit produce sparks?

Resistance becomes very low

Voltage disappears

Current becomes very small

None

If number of turns in coil is doubled, electromagnet strength will:

Increase

Decrease

Remain Same

None

Which statement best explains why electrical appliances have different thickness wires inside?

To look different

To control resistance and heating

To change color

None

1 out of 6

Name

Time's up

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Quiz on Electric current and its Effect

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