NCERT Solutions For Class 7 Science Chapter 14

NCERT Solutions For Class 7 Science Chapter 14 PDF Free Download

The NCERT solutions for class 7 Science chapter 14 Electric Current and its effects are crucial for the students of 7th standard. The solutions are provided here to help students understand the chapter in an easy and interesting way. These solutions are created by subject experts according to the latest CBSE syllabus (2019-2020). Students must practice these solutions regularly to prepare effectively for their examination. Check out the chapter 14 class 7 science NCERT Solutions given in pdf form.

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Access Answers of NCERT Solutions for Class 7 Science Chapter 14 Electric Current and its effects

Exercise Questions

1. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery

Solution:

Electric currents symbols

2. Draw the circuit diagram to represent the circuit shown in Fig.14.21.

circuit diagram

Solution:

circuit diagram

3. Fig.14.22 shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

baterry cell

Solution:

completed circuit

4. The bulb in the circuit shown in Fig.14.23 does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

wrong electric circuit

Solution:

In the circuit above bulb is connected on either side.

circuit diagram

5. Name any two effects of electric current.

Solution:

i) Heating effect of electric current

ii) Magnetic effect of electric current

6. When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Solution:

When the current is switched on through a wire, magnetic field is created around it hence we see deflection in the compass needle kept nearby.

7. Will the compass needle show deflection when the switch in the circuit shown by Fig.14.24 is closed?

compass needle

Solution:

No , compass needle does not show deflection when the circuit is a closed, magnetic field is not created until current is flowing through the circuit.

8. Fill in the blanks:

(a) Longer line in the symbol for a cell represents its terminal.

(b) The combination of two or more cells is called a .

(c) When current is switched ‘on’ in a room heater, it .

(d) The safety device based on the heating effect of electric current is called a .

Solution:

(a) Longer line in the symbol for a cell represents its positive terminal.

(b) The combination of two or more cells is called a battery.

(c) When current is switched ‘on’ in a room heater, it produces heat .

(d) The safety device based on the heating effect of electric current is called a fuse .

9. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)

(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)

(c) An electromagnet does not attract a piece of iron. (T/F)

(d) An electric bell has an electromagnet. (T/F)

Solution:

a) False

b) True

c) False

d) True

10. Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Solution:

No, because plastic does not have magnetic property to get attracted to a magnet hence magnet cannot be used to separate plastic bags.

11. An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

Solution:

It is not a wise idea to replace fuse by a piece of wire, as it has very low melting point. In case of metal piece, melting point will be high and the circuit will be intact in case there is overload or overheat.

12. Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.

incomplete circuit diagram

Solution:

Reasons maybe two

i) The connecting wire may be loose

ii) The electric cell may be used up

iii) switch may not be functioning well

iv) cell power has been exhausted

13. In the circuit shown in Fig. 14.25

circuit diagram

(i) Would any of the bulb glow when the switch is in the ‘OFF’ position?

(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Solution:

i) No, the bulb will not glow as the circuit is not complete when the switch is off

ii) If the switch is On, all the bulbs glow simultaneously.

For better understanding, BYJU’S presents the practice exercises, revision notes, electric current questions and answers which help students for understanding and clarification of the chapter.

Important topics covered in NCERT Solutions for Class 7 Science Chapter 14 Electric Current and its effects

Getting well versed with electric current class 10 concepts is very crucial for students. Current topics given in NCERT Class 7 textbooks play a pivotal role in examinations. It is very important to practice the symbols, circuit diagrams, formulae and problems. To score good marks. At BYJU’S downloadable files of e-books, notes, pdf, solved previous year question papers are available for students to start their exam preparation without delay.

To know more about how to represent electric components by symbols, draw circuit diagrams, the Heating effect of current and its applications, Electric fuse, Magnet like behaviour of electric current while flowing through wire, Electromagnet, Applications of electromagnets etc.. Sign up on BYJU’S the learning app. Once you have registered with BYJU’S access to online course is very simple.

Apart from NCERT solutions class 7 Science chapter 14, get NCERT solutions for other class 7 science chapters here. Students can download worksheets, assignments, NCERT Class 7 Science Solution and other study materials for exam preparation and score better marks.

Frequently Asked Questions on Electric Current and Its Effects

Do you think an electromagnet can be used for separating plastic bags from a garbage heap?

No, because plastic does not have magnetic property to get attracted to a magnet hence magnet cannot be used to separate plastic bags.

Define battery?

The combination of two or more cells is called a battery.

What is fuse?

The safety device based on the heating effect of electric current is called a fuse .

Would any of the bulb glow when the switch is in the ‘OFF’ position?

No, the bulb will not glow as the circuit is not complete when the switch is off

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