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Electric Circuits Basics: 19 MCQs with answers

All 19 multiple-choice questions from this kit, free and with no sign-up.

Full kit · everything Flashcards · 15 Quick Revision · 18

Warm-up · 12 questions

Q1. In the simple switch made in Activity 3.8, what is the role of the safety pin?

Beginner
A It acts as a resistor that reduces current. B It acts as a source of electric current. C It acts as an insulator that prevents current flow. D It acts as a conductor that can complete or break the circuit.
Show answer & explanation

It acts as a conductor that can complete or break the circuit.

The safety pin, when touching both drawing pins, closes the gap and completes the path for current to flow. When it does not touch the second drawing pin, it breaks the circuit.

Q2. When the safety pin does NOT touch the second drawing pin, the circuit is said to be in the ___ position.

Beginner
A Short B OFF C Closed D ON
Show answer & explanation

OFF

When the safety pin does not touch the second drawing pin, the gap prevents current flow, and the circuit is open. This is called the OFF position.

Q3. In the symbol for an electric cell, the long line represents the ___ terminal.

Beginner
A ground B neutral C positive D negative
Show answer & explanation

positive

In the symbol for an electric cell, the long line represents the positive terminal, while the short line represents the negative terminal.

Q4. What happens to the lamp when the safety pin touches both drawing pins in the switch?

Beginner
A The lamp flickers because the current is unstable. B The lamp glows dimly because the circuit is partially open. C The lamp does not glow because the circuit is open. D The lamp glows because the circuit is closed and current flows.
Show answer & explanation

The lamp glows because the circuit is closed and current flows.

When the safety pin touches both drawing pins, it closes the gap and completes the path, allowing current to flow from the cell's positive to negative terminal, making the lamp glow.

Q5. A switch can be placed ___ in a circuit.

Beginner
A only near the positive terminal B only near the negative terminal C anywhere D only in the middle
Show answer & explanation

anywhere

The source content states that a switch can be placed anywhere in a circuit.

Q6. Which of the following components is represented by a symbol with a long line and a short line?

Beginner
A Electric cell B Switch C Battery D Electric lamp
Show answer & explanation

Electric cell

The symbol for an electric cell has a long line (positive terminal) and a short line (negative terminal).

Q7. What is the primary function of a switch in an electric circuit?

Beginner
A To store electrical energy B To convert electrical energy into light C To increase the voltage of the circuit D To either complete or break the circuit
Show answer & explanation

To either complete or break the circuit

A switch is a simple device that either completes or breaks a circuit, controlling the flow of current.

Q8. In the OFF position of the switch, the circuit is described as ___.

Beginner
A open B closed C complete D short
Show answer & explanation

open

In the OFF position, the gap in the circuit prevents current flow, so the circuit is open.

Q9. The switches used for lights at home work the same way as the simple switch made in the activity, though they are ___.

Beginner
A completely different in principle B not based on the same principle C only used for lights D designed differently
Show answer & explanation

designed differently

The source states that home switches work the same way, though they are designed differently.

Q10. In the symbol for an electric cell, the short line represents the ___ terminal.

Beginner
A positive B ground C neutral D negative
Show answer & explanation

negative

In the symbol for an electric cell, the short line represents the negative terminal, while the long line represents the positive terminal.

Q11. A switch can only be placed near the positive terminal of a cell.

Beginner
A True B False
Show answer & explanation

False

The source states that a switch can be placed anywhere in a circuit.

Q12. When the safety pin touches both drawing pins, the circuit is closed and the lamp glows.

Beginner
A True B False
Show answer & explanation

True

When the safety pin touches both drawing pins, it closes the gap and completes the path, allowing current to flow and making the lamp glow.

Building up · 7 questions

Q13. Which of the following is the correct symbol for a switch in the 'ON' position?

Intermediate
A A line with a small circle at one end and a dot at the other, not touching B A gap in the wire with a small break C A line with a small circle at one end and a dot at the other, touching D A continuous line with a dot at each end
Show answer & explanation

A line with a small circle at one end and a dot at the other, touching

In the ON position, the switch symbol shows the two contact points touching, indicating a closed circuit. The OFF position shows them separated.

Q14. In the simple switch, what is the function of the drawing pins?

Intermediate
A They act as a power source for the circuit. B They act as contact points for the safety pin to complete the circuit. C They act as insulators to prevent current flow. D They act as resistors to limit current.
Show answer & explanation

They act as contact points for the safety pin to complete the circuit.

The drawing pins are fixed to the cardboard and wires are connected to them. When the safety pin touches both, it completes the circuit through the drawing pins.

Q15. Which of the following is NOT a component listed in Table 3.2 for circuit diagrams?

Intermediate
A Electric cell B Battery C Light Emitting Diode (LED) D Resistor
Show answer & explanation

Resistor

Table 3.2 lists electric cell, battery, electric lamp, LED, switch in ON position, switch in OFF position, and wire. Resistor is not listed.

Q16. When the safety pin touches both drawing pins, the current flows from the cell's ___ terminal to the ___ terminal.

Intermediate
A negative to negative B positive to positive C negative to positive D positive to negative
Show answer & explanation

positive to negative

The source states that current flows from the cell's positive to negative terminal making the lamp glow when the circuit is closed.

Q17. In the simple switch, what is the purpose of the cardboard piece?

Intermediate
A It acts as a conductor. B It acts as a base to hold the drawing pins and safety pin. C It acts as a power source. D It acts as a switch.
Show answer & explanation

It acts as a base to hold the drawing pins and safety pin.

The cardboard piece serves as a base to fix the drawing pins and the safety pin, allowing the switch to be constructed.

Q18. Which of the following is the correct symbol for a switch in the 'OFF' position?

Intermediate
A A continuous line with no break B A line with a small circle at one end and a dot at the other, touching C A line with a small circle at one end and a dot at the other, not touching D A line with a gap in the middle
Show answer & explanation

A line with a small circle at one end and a dot at the other, not touching

In the OFF position, the switch symbol shows the two contact points separated, indicating an open circuit.

Q19. What is the purpose of connecting a wire to each drawing pin in the switch?

Intermediate
A To provide insulation B To hold the safety pin in place C To make the switch look neat D To connect the switch to the rest of the circuit
Show answer & explanation

To connect the switch to the rest of the circuit

The wires connected to each drawing pin allow the switch to be integrated into the circuit, enabling it to control the flow of current.

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