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# NCERT Exemplar for Class 7 Science Solutions Chapter 14 Electric Current and Its Effects

Last updated date: 14th Sep 2024
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## Class 7 Science NCERT Exemplar Solutions Chapter 14 Electric Current and Its Effects

Free PDF download of NCERT Exemplar for Class 7 Science Chapter - 14 Electric Current and Its Effects solved by expert Science teachers on Vedantu as per NCERT (CBSE) Book guidelines. All Chapter - 14 Electric Current and Its Effects exercise questions with solutions to help you to revise the complete syllabus and score more marks in your examinations.

## Access NCERT Exemplar Solutions for Class 7 Science(Physics) Chapter 14 - Electric Current and Its Effects

### Multiple Choice Questions

1. When an electric current flows through a copper wire AB as shown in Figure 14.1, the wire

Figure 14.1

(a) Deflects a magnetic needle placed near it.

(b) Becomes red hot.

(c) Gives electric shock.

(d) Behaves like a fuse.

Ans: The correct answer is option (a), Deflects a magnetic needle placed near it. A current carrying wire produces a magnetic field.

2. Choose the statement which is not correct in the case of an electric fuse.

(a) Fuses are inserted in electric circuits of all buildings.

(b) There is a maximum limit on the current which can safely flow through the electric circuits.

(c) There is a minimum limit on the current which can safely flow in the electric circuits.

(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.

Ans: The correct answer is option (c), There is a minimum limit on the current which can safely flow in the electric circuits.

3. Three bulbs A, B, C are connected in a circuit as shown in Figure 14.2. When the
switch is ‘ON’

(a) Bulb C will glow first.

(b) Bulb B and C will glow simultaneously and bulb A will glow after some time.

(c) All the bulbs A, B and C will glow at the same time.

(d) The bulbs will glow in the order A, B and C.

Ans: The correct answer is option (c), All the bulbs A, B and C will glow at the same time.

4. When a switch is in OFF position,

(i) Circuit starting from the positive terminal of the cell stops at the switch.

(ii) Circuit is open.

(iii) No current flows through it.

(iv) Current flows after some time.

Choose the combination of correct answers from the following.

(a) all are correct

(b) (ii) and (iii) are correct

(c) only (iv) is correct

(d) only (i) and (ii) are correct

Ans: The correct answer is option (b), Circuit is open and zero current flows through it.

5. Which of the following precautions need not be taken while using electric

(a) We should never touch a lighted electric bulb connected to the mains.

(b) We should never experiment with the electric supply from the mains or a generator
or an inverter.

(c) We should never use just any wire or strip of metal in place of a fuse.

(d) We should never turn the switch in ON position.

Ans: The correct answer is option (d), we should never turn the switch in ON position.

6. Which property of a conducting wire is utilised in making electric fuse?

Ans: In order to make an electric fuse, the property of low melting point is used.

7. Name the device used these days in place of electric fuses in electrical circuits.

Ans: The device is known as a 'Miniature Circuit Breaker (MCB).

8. Fill in the blanks:

(i) Our body is a ________________ of electricity.

Ans: Conductor

(ii) An electric cell produces electricity from the __________ ___________ in it.

Ans: Chemicals stored

(iii) In an electric circuit a fuse is a _________ _______ to prevent possible fire.

Ans: Safety Device

(iv) A combination of two or more cells is called a _________.

Ans: Switch

9. Unscramble the following words:

i) TBTAYER

Ans: BATTERY

ii) SFEU

Ans: FUSE

iii) HTRCO

Ans: TORCH

iv) HICWTS

Ans: SWITCH

10. Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel in the night to get dim light. Has she taken the right step? Give one reason to justify your answer.

Ans: No, Paheli's action was not correct. The heat produced by the electric bulb is a waste of electrical energy. She wasted a lot of energy by covering the bulb in her room with a towel at night to get a dull light.

11. Why are compact fluorescent lamps (CFLs) preferred over electric bulbs?

Ans: The electric bulb consumes more electricity and wastes electricity in the form of heat. Compact fluorescent bulbs, on the other hand, do not squander electrical energy as heat and consume less energy.

12. Why is an electric fuse required in all electrical appliances?

Ans: The word "electric fuse" refers to a safety device that prevents an electric circuit from overheating. It guards against harm to any electrical gadgets.

13. Can we use the same fuse in a geyser and a television set? Explain.

Ans: To heat water, a geyser is employed. As a result, geysers require a lot of electricity.

Pixels are displayed on a screen using television. As a result, compared to a geyser, television requires a lower rate of electricity.

As a result, separate fuses must be used in a geyser and a television set depending on the required rate of electricity.

14. Name two electric devices for each where

(i) heating effect of current is used

Ans: Current-heating devices are used: room heaters and geysers.

(ii) magnetic effect of current is used

Ans: Cranes and electric bells employ the magnetic influence of current.

15. Why do we cover plug pin holes which are within the reach of children with cello tape or a plastic cover when not in use?

Ans: Any child that inserts his or her figure into the socket risks receiving an electric shock, which may be fatal. To protect children from receiving an electric shock, we cover plug pinholes with cello tape or a plastic cover.

16. Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give a reason.

Ans: The magnetic effect is directly proportional to the number of wire turns on the electromagnet. As a result of the greater number of turns of wire on paheli's electromagnet, it will attract more pins. As a result, Paheli's electromagnet is the most powerful electromagnet.

17. Your teacher has shown you the following activity.

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.

Ans: a) The pins are drawn to the iron nail. Why?

b) What happens if the current is reduced or increased?

b) What happens if more than two cells are connected in an electric circuit?

18. Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in figure below. The current flowing in both the circuits is the same.

i) Will the heat produced in both the cases be equal? Explain.

Ans: The total sum of heat produced in each wire is proportional to its length (end to end distance). As a result, the total amount of heat produced in both circumstances will be different.

ii) Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.

Ans: No, the overall amount of heat produced by a wire is determined by its thickness or width. No, the quantity of heat produced in the wire is determined by its thickness.

19. How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.

Ans: The circuit of electric circuit is given below:

Electric current travels through the coil when the circuit is turned on. The coil becomes magnetised due to the magnetic influence of electricity. This magnetised coil attracts a soft iron armature that is nearby. Because of this, the hammer makes a sound by striking the gong (bell). As a result, the bell begins to ring.

The magnetization of the coil and the flow of electricity will halt when the circuit is turned off. As a result, the bell stops ringing.

20. Draw the symbols of the following circuit components.

(i) Electric cell

(ii) Switch in off position

(iii) Electric bulb

(iv) Battery

Ans: The symbol of circuit components are:

 Circuit Component Symbol Electric Cell Switch in Off position Electric bulb Battery

Class 7 Science Solutions NCERT Exemplar Chapter 14 Electric Current and Its Effects include answers to all of the questions in the NCERT Exemplar book.  Vedantu contains solutions to a variety of problems of varying complexity that will assist you in learning more about Electric Current and Its Effects.

Fill it, match the column, problems on electronic circuit diagrams, true or false problems, their solutions, and full explanations for all multiple-choice questions are included in the NCERT Exemplar Class 7 Science Answers for the chapter Electric Current and Its Effects.

Solutions and explanations are provided for 5 multiple choice questions, 7 very short answer questions, 4 short answer questions, and 4 long answer questions in the NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects.

### NCERT Exemplar  Science Solutions for the chapter of  Electric Current and Its Effects, Standard 7, covers the following topics:

14.1 – Electric Component Symbols

14.2 – The Effect of Electric Current on Heating

14.3 – Electric Current Magnetic Effect

Electromagnet (14.4)

Electric Bell (14.5).

NCERT Exemplar  Science Solutions for the chapter of  Electric Current and Its Effects, Standard 7,  are quite important. Fundamentals of electric circuits, heating and magnetic effect of electric current, signs used in electric circuits, working of bulb filaments, fuse and MCB'S, uses of the magnetic effect of electric current, and operating of an electric bell are all covered in the NCERT Exemplar Class 7 Science Solutions Chapter 14 answer.

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Vedantu's NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects are the best and most dependable NCERT Exemplar Solutions available on the internet.  Class 7 Science Solutions Chapter 14 NCERT Exemplar Electric Current and Its Effects are based on the CBSE Science Syllabus for Class 7. These NCERT Exemplar Answers for Class 7 Science Chapter 14 can make learning easier and more enjoyable. Students may also get a copy of the NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects in PDF format for free.NCERT Exemplars are essentially practising books with higher-level questions that provide comprehensive learning. Class 7 Science Solutions  The NCERT Exemplar Chapter 14 Electric Current and Its Effects are available on the Vedantu website for both offline and online use.

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NCERT exemplar answers help pupils build a better core of ideas that will help them prepare for any competitive examinations in the future.

3. What are the various advantages of NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects?

Exemplar plays a significant role in the preparation for Class 10 board exams. The NCERT books for Class 10 are used to answer the majority of questions on the Board exams. Pupils must answer the NCERT Exemplar questions correctly. For the convenience of the learners, we have provided NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects. These NCERT Exemplar Class 10 Solutions have been provided by subject matter professionals. These NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects science are based on the most recent NCERT syllabus. This NCERT Exemplar for Class 10 Science answers will assist students in comprehending ideas as well as provide knowledge into answer composing approaches.

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All students must read the complete chapter thoroughly and build their concepts before dealing with the NCERT Exemplar Class 7 Science Solutions Chapter 14 Electric Current and Its Effects. Recognize and comprehend all of the concepts presented in this chapter.

Initially, attempt to answer all of the problems on your own before consulting the NCERT science answers for Class 10.

The board exam problems are mainly given on the questions found in the NCERT texts. So, it is essential to ask questions and provide precise answers.

Study past years' CBSE board Class 10 science papers to learn about the types of problems that will be asked in the examination. These Answers can be used by most of the boards that prefer the NCERT Textbooks to gain a better understanding of the subject.