Homework Practice

Printable assignment

Final Assessment: Electric Current and Its Effects

Recall and Core Ideas

Question 1mcq

Which set contains the basic parts needed for a simple working torch circuit?

A.Cell, bulb, switch and connecting wires

B.Cell, eraser, ruler and paper

C.Bulb, magnet, thread and soil

D.Switch, water, flower and stone

Question 2mcq

Why does a bulb not glow in an open circuit?

A.The bulb becomes heavier.

B.The path for electric current is broken.

C.The cell loses both terminals.

D.Current flows twice as fast.

Question 3mcq

A student connects only one terminal of a cell to a bulb. The bulb does not glow. What is missing?

A.A second bulb always

B.A magnet near the bulb

C.A complete path back to the other terminal of the cell

D.A glass rod touching the cell

Question 4mcq

What is the main reason scientists use standard circuit symbols?

A.They make batteries last forever.

B.They remove the need for wires.

C.They stop current from flowing.

D.They make circuit diagrams simple and understandable to everyone.

Question 5mcq

In a circuit diagram, a switch is shown open. What should you infer?

A.Current will not flow through that branch.

B.The current becomes stronger.

C.The cell changes into a magnet.

D.The bulb must glow brighter.

Question 6mcq

A diagram shows two cells connected positive to negative in sequence. What is this combination called?

A.Fuse

B.Battery

C.Filament

D.Electromagnet only

Processes and Observations

Question 7mcq

Why does the filament of an electric bulb glow?

A.It absorbs water from air.

B.It changes into a permanent magnet only.

C.It becomes hot due to the heating effect of current.

D.It cools rapidly when current flows.

Question 8mcq

Which appliance mainly uses the heating effect of electric current?

A.Compass

B.Bicycle bell without electricity

C.Magnifying glass

D.Electric iron

Question 9mcq

Why are heating elements often made of materials like nichrome?

A.They can get hot without melting easily.

B.They dissolve quickly in water.

C.They are always perfect insulators.

D.They stop all resistance.

Question 10mcq

What is the role of a fuse in an electric circuit?

A.It increases current endlessly.

B.It melts and breaks the circuit when current is too high.

C.It stores water for the circuit.

D.It changes AC into sunlight.

Question 11mcq

Why is replacing a fuse wire with a thick copper wire unsafe?

A.Copper wire makes the circuit waterproof.

B.Thick copper always reduces voltage to zero.

C.The thick wire may not melt during excess current, so protection is lost.

D.The appliance becomes lighter.

Question 12mcq

An MCB trips repeatedly when a heater and iron run together. What is the best first response?

A.Tape the MCB in the ON position.

B.Replace the MCB with a nail.

C.Pour water on the switchboard.

D.Switch off some appliances and check for overload.

Applications and Calculations

Question 13mcq

What happens when electric current flows through a wire near a compass?

A.The compass needle may deflect.

B.The compass needle disappears.

C.The wire turns into plastic.

D.The cell becomes a flower.

Question 14mcq

Which observation shows the magnetic effect of current?

A.A dry seed absorbs water.

B.A compass needle moves when placed near a current-carrying wire.

C.Ice melts in sunlight.

D.Salt dissolves in water.

Question 15mcq

If current in a coil is switched off, what usually happens to its magnetic effect?

A.It becomes permanent in every material.

B.It doubles forever.

C.It disappears or becomes very weak.

D.It turns into heat only in all cases.

Question 16mcq

How can the strength of a simple electromagnet generally be increased?

A.Remove the iron core and cut the wire.

B.Use a dry wooden core only.

C.Open the switch permanently.

D.Increase the number of turns of wire around the iron core.

Question 17mcq

Why is soft iron commonly used as the core of an electromagnet?

A.It becomes magnetised easily and loses magnetism when current stops.

B.It is always an electrical insulator.

C.It melts at room temperature.

D.It cannot be affected by current.

Question 18mcq

Which device commonly uses an electromagnet?

A.Wooden ruler

B.Electric crane for lifting scrap iron

C.Plain glass tumbler

D.Cotton cloth

Reasoning and Misconceptions

Question 19mcq

In an electric bell, what pulls the iron strip towards it when current flows?

A.Dry cell label

B.Wooden base

C.Electromagnet

D.Glass cover

Question 20mcq

Why does the hammer in an electric bell vibrate repeatedly?

A.The gong becomes a battery.

B.The switch stays open forever.

C.The hammer is heated until it melts.

D.The circuit keeps making and breaking as the strip moves.

Question 21mcq

A bell rings once and then stops though the cell is working. Which fault is most likely?

A.The make-and-break contact is not working properly.

B.The gong is made of metal.

C.The wire has insulation outside.

D.The cell has two terminals.

Question 22mcq

A bulb glows dimly when two cells are weakly connected and wires are loose. What should be checked first?

A.Whether the bulb is planted in soil

B.Whether the circuit connections are tight and complete

C.Whether the switch has changed into a magnet

D.Whether the diagram has too many colours

Question 23mcq

Assertion: A fuse should be connected in series with the appliance. Reason: It must break the current path when excess current flows.

A.Both are true, but the reason does not explain the assertion.

B.Assertion is false, but reason is true.

C.Both assertion and reason are true, and the reason explains the assertion.

D.Assertion is true, but reason is false.

Question 24mcq

A student builds an electromagnet but it does not pick up pins. Which change is most likely to help?

A.Use a plastic straw as the core and keep the switch open.

B.Remove the cell from the circuit.

C.Cut the coil into separate pieces.

D.Close the switch and use more turns of insulated wire around a soft iron nail.