Electric Circuits - SEC 2nt
There are 10 MCQ questions in this quiz. Good luck!
- 1.
You are given a light bulb and some wires.What else is needed to form a complete circuit so that the light bulb can light up?
- A.
A switch
- B.
A cell
- C.
A resistor
- D.
A piece of iron
Correct Answer
B. A cellExplanation
To form a complete circuit and light up the light bulb, a cell is needed. A cell is a device that converts chemical energy into electrical energy, providing the necessary power source for the circuit. Without a cell, there would be no electricity flowing through the wires to power the light bulb, and therefore it would not light up. A switch, resistor, or piece of iron are not essential components for the light bulb to light up, although they may be used for other purposes in a circuit.Rate this question:
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- 2.
If the switch in the following diagram is open, what will happen to the light bulb?
- A.
It will light up
- B.
It will be brighter than normal
- C.
It will be dimmer than normal
- D.
It will not light up
Correct Answer
D. It will not light upExplanation
If the switch in the diagram is open, it means that there is no complete circuit for the flow of electricity. Without a closed circuit, the current cannot reach the light bulb, and therefore it will not light up.Rate this question:
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- 3.
Which list contains one conductor and one insulator of electricity?
- A.
Plastic, glass
- B.
Gold, aluminium
- C.
Iron, wood
- D.
Copper, zinc
Correct Answer
C. Iron, woodExplanation
Iron is a conductor of electricity because it has free electrons that can move easily through its structure, allowing electric current to flow. Wood, on the other hand, is an insulator of electricity because it does not have free electrons and does not allow electric current to flow easily. Therefore, the list "iron, wood" contains one conductor (iron) and one insulator (wood) of electricity.Rate this question:
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- 4.
Which of the following is an example of electrical conductor?
- A.
Silver fork
- B.
Eraser
- C.
Plastic ruler
- D.
Rubber band
Correct Answer
A. Silver forkExplanation
Silver is a good conductor of electricity because it has a high number of free electrons that can move easily through its structure. This allows electric current to flow easily through silver. In contrast, eraser, plastic ruler, and rubber band are insulators and do not allow the flow of electric current. Therefore, the silver fork is the only example in the given options that is an electrical conductor.Rate this question:
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- 5.
When a switch is closed, it means that
- A.
Electricity cannot flow through the switch
- B.
Electricity can flow through the switch
- C.
The circuit is broken
- D.
The switch is turned off
Correct Answer
B. Electricity can flow through the switchExplanation
When a switch is closed, it means that electricity can flow through the switch. Closing a switch completes the circuit, allowing electricity to flow from the power source through the switch and into the connected devices or components. This allows the electrical current to continue its path and power the devices that are connected to the circuit.Rate this question:
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- 6.
In which of the following situations will light bulb A light up only?
- A.
Close switch a, b and c
- B.
Open switch a, b and c
- C.
Close switch a and b, and open switch c
- D.
Close switch a and c, and open switch b
Correct Answer
D. Close switch a and c, and open switch bExplanation
In order for light bulb A to light up, switches a and c need to be closed, and switch b needs to be open. This means that the circuit needs to be completed through switches a and c, while switch b needs to break the circuit for light bulb B.Rate this question:
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- 7.
A simple circuit is made up of a cell, a light bulb and some wires. The light bulb lights up normally.What can you do to increase the brightness of the light bulb?
- A.
Add one more cell in series to the circuit
- B.
Add one more light bulb in series to the circuit
- C.
Add a switch in series to the circuit
- D.
Add a resistor in series to the circuit
Correct Answer
A. Add one more cell in series to the circuitExplanation
Adding one more cell in series to the circuit will increase the brightness of the light bulb. When cells are connected in series, their voltages add up, resulting in a higher total voltage across the circuit. This increased voltage will cause more current to flow through the light bulb, leading to a brighter glow.Rate this question:
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- 8.
What will happen if we add too many cells to the circuit in Question 7?
- A.
The cells may explode
- B.
The cells will stop working
- C.
The light bulb may burn out
- D.
The light bulb will get too bright to see
Correct Answer
C. The light bulb may burn outExplanation
If too many cells are added to the circuit, the increased voltage may cause the light bulb to burn out. This is because the excess voltage can generate excessive heat, leading to the filament in the light bulb becoming too hot and eventually burning out.Rate this question:
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- 9.
Which component does the following symbol represent?
- A.
Cell
- B.
Wire
- C.
Switch
- D.
Resistor
Correct Answer
D. ResistorExplanation
The given symbol represents a resistor. A resistor is an electrical component that limits the flow of electric current in a circuit. It is usually represented by a zigzag line in circuit diagrams. Resistor values are measured in ohms and they are used to control the amount of current flowing through a circuit, regulate voltage levels, and dissipate heat.Rate this question:
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- 10.
What does the following symbol represents?
- A.
An open switch
- B.
A closed switch
- C.
A piece of broken wire
- D.
Two cells
Correct Answer
A. An open switchExplanation
The symbol "an open switch" represents a switch that is not connected, meaning that the circuit is open and no current can flow through it.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Apr 23, 2010Quiz Created by
Hectorhan
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