Students can practice the best Class 7 Science MCQ and Electricity Circuits and Their Components Class 7 Science Curiosity Chapter 3 MCQ Online Test with Answers for exam preparation.
Class 7 Science Chapter 3 Electricity Circuits and Their Components MCQ
Electricity Circuits and Their Components MCQ Class 7
MCQ On Electricity Circuits and Their Components Class 7
Question 1.
Which of following does not permit current to pass ?
(a) Wood
(b) Iron
(c) Copper
(d) All of these
Answer:
(a) Wood
Question 2.
Which is not a circuit component ?
(a) Battery
(b) Electric bulb
(c) Switch
(d) P.D.
Answer:
(d) P.D.
Question 3.
A broken filament
(a) stops current flow
(b) permit current flow
(c) circuit is open
(d) circuit is closed
Answer:
(a) stops current flow
Question 4.
Electricity from battery is :
(a) DC
(b) AC
(c) Both (a) and (b)
(d) None of these
Answer:
(c) Both (a) and (b)
Question 5.
What causes the torchlight lamp to glow when the switch is turned on?
(a) The switch generates current
(b) The circuit becomes complete
(c) The lamp gets heated
(d) The wires release light
Answer:
(b) The circuit becomes complete
Question 6.
What is the role of the filament in an incandescent lamp?
(a) To act as a terminal
(b) To conduct heat
(c) To emit light by glowing
(d) To support the glass bulb
Answer:
(c) To emit light by glowing
Question 7.
Which combination will allow the LED to glow?
(a) Positive wire of battery to shorter LED terminal
(b) Any direction will work
(c) Positive wire to longer LED terminal
(d) Both wires to same LED terminal
Answer:
(c) Positive wire to longer LED terminal
Question 8.
Which material among the following is an insulator?
(a) Copper wire
(b) Aluminium strip
(c) Rubber eraser
(d) Steel spoon
Answer:
(c) Rubber eraser
Question 9.
What happens when the filament of a lamp breaks?
(a) The current flows faster
(b) The lamp glows brighter
(c) The circuit becomes more efficient
(d) The lamp stops glowing
Answer:
(d) The lamp stops glowing
Question 10.
Which is the correct direction of current in a circuit using a cell?
(a) From lamp to switch
(b) From negative to positive terminal
(c) From positive to negative terminal
(d) Random direction
Answer:
(c) From positive to negative terminal
Question 11.
Which of these is a symbol used in circuit diagrams?
(a) Triangle for battery
(b) Square for lamp
(c) Long and short lines for cell
(d) Circle for switch
Answer:
(c) Long and short lines for cell
Question 12.
What happens in an open circuit?
(a) Current flows
(b) Lamp glows brightly
(c) No current flows
(d) Cell explodes
Answer:
(c) No current flows
Question 13.
Which device is used to complete or break an electrical circuit?
(a) Battery
(b) Switch
(c) Lamp
(d) LED
Answer:
(b) Switch
Question 14.
Which of these allows current to flow only in one direction?
(a) Lamp
(b) Switch
(c) LED
(d) Electric cell
Answer:
(c) LED
Question 15.
Why do we use copper wires in electric circuits?
(a) Because they are decorative
(b) Because they are cheap
(c) Because they are good conductors
(d) Because they are heavy
Answer:
(c) Because they are good conductors
Question 16.
In a battery of two cells, how are the terminals connected?
(a) Both positive terminals together
(b) Both negative terminals together
(c) Positive to negative
(d) Randomly
Answer:
(c) Positive to negative
Question 17.
What does the glowing of a lamp indicate in a circuit?
(a) Cell is damaged
(b) Circuit is open
(c) Filament is broken
(d) Circuit is complete
Answer:
(d) Circuit is complete
Question 18.
Which is an example of a conductor among these?
(a) Wooden stick
(b) Plastic ruler
(c) Steel spoon
(d) Rubber band
Answer:
(c) Steel spoon
Question 19.
Which feature of an LED makes it different from an incandescent lamp?
(a) It uses more energy
(b) It has a glowing filament
(c) It works in both directions
(d) It has no filament
Answer:
(d) It has no filament
Question 20.
Which one is NOT a portable source of electricity?
(a) Electric cell
(b) Battery
(c) Solar panel
(d) Wall socket
Answer:
(d) Wall socket
Question 21.
Why should we not use metal wires without insulation?
(a) They look dull
(b) They reduce brightness
(c) They can cause short circuits or shocks
(d) They increase voltage
Answer:
(c) They can cause short circuits or shocks
Question 22.
Which component stores chemical energy and converts it to electrical energy?
(a) LED
(b) Lamp
(c) Cell
(d) Wire
Answer:
(c) Cell
Question 23.
Why is the longer terminal of LED always connected to the battery’s positive side?
(a) For better light
(b) To complete the circuit
(c) Because it conducts more
(d) Because current flows only in one direction
Answer:
(c) Because it conducts more
Electricity Circuits and Their Components Class 7 Assertion Reason Questions
Given below are, two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
(b) Both (A) and (R) are true and (R) is not correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.
1. Assertion (A) : Positive terminal of a cell is connected to -ve terminal of the next cell.
Reason (R) : A cell has two terminals one is +ve but other is -ve.
Answer:
(b) Both (A) and (R) are true and (R) is not correct explanation of (A).
2. Assertion (A) : A lamp glows only whn th eelectrical circuit is complete..
Reason (R) : A complete circuit provides a path for electric current to flow from the cell’s positive terminal to the negative terminal.
Answer:
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
3. Assertion (A): The switch in a circuit is used to control the flow of electricity.
Reason (R): The switch opens or closes the circuit to either allow or stop the flow of current.
Answer:
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
4. Assertion (A): A battery is used to power an electrical circuit.
Reason (R): A battery provides a source of voltage to move electrons through the circuit.
Answer:
(a) Both (A) and (R) are true and (R) is correct explanation of (A).
5. Assertion (A): An LED glows only when connected in the correct direction in a circuit.
Reason (R): The current can flow through an LED in both directions.
Answer:
(c) (A) is true but (R) is false.
Electricity Circuits and Their Components Class 7 Fill in the Blanks
1. An LED possesses ______ terminals.
Answer:
two
2. Best electrical conductor is ______.
Answer:
gold
3. A torch is known as ______.
Answer:
flashlight
4. All electrical cells contain two ______.
Answer:
terminals
5. A light bulb needs a ______.
Answer:
torchlight
6. Circuit diagram is a simplified conventional pictorial representation of an ______.
Answer:
Electric Circuit
7. Mostly ______ is used to make wires.
Answer:
copper
8. A switch saves us from electric ______.
Answer:
shock
9. Combination of two or more cells is called ______.
Answer:
battery
10. A safety device that prevents excess of electric current from flowing in a circuit is known as ______.
Answer:
electric fuse
11. A longer line in the symbol for cell represents its ______ terminal.
Answer:
positive
Electricity Circuits and Their Components Class 7 True or False
1. Rubber and plastic are electrical insulators.
Answer: True
2. We use electricity in an electric fan.
Answer: True
3. A torchlight does not have a switch.
Answer: False
4. An electric cell has three terminals.
Answer: False
5. The filament of a lamp is thin glowing wire.
Answer: True
6. Now-a-days LED’s are not used in torches.
Answer: False
7. Candle made of wax is an insulator.
Answer: True
8. Metals are bad conductors of electricity.
Answer: False
9. The sockets consist of insulators.
Answer: False
10. Electric current passes through copper easily.
Answer: True