NCERT Class 7 Science Chapter 14 Electric Current and its Effects Extra Questions and Answers
Class 7 Science Chapter 14 Extra Questions and Answers – Electric Current and its Effects. Here in this Page Class VII Students can Learn Extra Questions & Answer 14th Chapter Science fully Inside.
We Provided Here Electric Current and its Effects Science Chapter 14 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
Class 7 Science Chapter 14 Extra Question with Answer – Electric Current and its Effects
Science Chapter 14 Electric Current and its Effects Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1) Fill in the blanks:
a) The combination of two or more cells is called a ___. (Battery)
b) It is convenient to represent electric components by ___. (Symbols)
c) When an electric current flows through a wire, it behaves like a ___. (Magnet)
2) Multiple choice questions:
a) The coil of wire in room heater is called ___?
a) Battery b) Element
Ans. b) Element
b) Which of the following device does not use battery?
a) Torches b) Toys c) Spectacles d) Transistor
Ans. c) Spectacles
c) When the switch is in the ___ position, the circuit is incomplete.
a) ‘OFF’ b) ‘ON’
Ans. a) ‘OFF’
3) Answer the following questions:
a) When a circuit is said to be closed and the current flows throughout the circuit instantly?
Ans. A circuit is said to be closed and the current flows throughout the circuit instantly when the switch is in the ‘ON’ position, the circuit from the positive terminal of the battery to the negative terminal is complete.
b) Why we should not touch a lighted bulb connected to the mains? Why damaged fluorescent tubes or CFLs need to be disposed off safely?
Ans. We should not touch a lighted bulb connected to the mains because it may be very hot and our hand may get burnt badly.
Fluorescent tubes and CFLs contain mercury vapor, toxic in nature. Therefore, damaged fluorescent tubes and CFLs need to be disposed off safely.
c) Why LED bulbs are preferred over fluorescent tubes or CFLs?
Ans. For producing an intensity of light, LED bulbs consume less electricity as compared to incandescent bulbs or fluorescent tubes or CFLs. Thus LED bulbs are much electricity efficient and therefore being preferred over others.
In case you are missed :- Previous Chapter Extra Questions
d) What is electromagnet? Name a device that uses electromagnet.
Ans. A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet.
Crane uses electromagnet.
4) Mark your answer as per the codes provide below:
a) A: Do not keep the switch in the ‘ON’ position for a long time.
R: The cell may not become weak very quickly.
I) Both A and R are true and R is the correct explanation of A.
II) Both A and R are true but R is not the correct explanation of A.
III) A is true but R is false.
IV) A is false but R is true.
V) Both A and R are false.
Ans. III. A is true but R is false.
b) A: We should not experiment with the electric supply from the mains or a generator or an inverter.
R: We may get an electric shock, which may be dangerous.
I) Both A and R are true and R is the correct explanation of A.
II) Both A and R are true but R is not the correct explanation of A.
III) A is true but R is false.
IV) A is false but R is true.
V) Both A and R are false.
Ans. I. Both A and R are true and R is the correct explanation of A.
5) Wires made from some special materials melt quickly and break when large electric currents are passed through them. These wires are used for making electric fuses. In all buildings fuses are inserted in all electric circuits. There is a maximum limit on the current which can safely flow through a circuit.
a) What is fuse?
Ans. Fuse is a safety device which prevents damages to electrical circuits and possible fire.
b) In all buildings fuses are inserted in all ____. (Electric circuits)
In case you are missed :- Next Chapter Extra Questions
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