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

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

Edited By Vishal kumar | Updated on Apr 11, 2025 06:38 PM IST

Ever wondered how a bulb glow or how a fan works? chapter 10 of class 7 science electric current and its effects explains all these in a fun and easy way You will learn how to draw symbols for electric tools like wires batteries switches and more plus cool concepts like the heating and magnetic effects of current. It even shows how electromagnets work and where we use it in real life.

NCERT Solutions for Class 7 Science Chapter 10 Electric Current and Its Effects help you to understand all the key ideas in a simple way. These solutions have answers to all 13 exercise questions and are perfect for quick revision. If you're following the NCERT syllabus, this is a great tool to prepare well and score better in your exams.

This Story also Contains
  1. Download the PDF of NCERT Solutions for Class 7 Science Chapter 10 Electric Current and Its Effects
  2. NCERT Solutions For Class 7 Science Chapter 10 Electric Current and Its Effects: Exercise Question and Answer
  3. Electric Current and Its Effects Class 7 NCERT Solutions: Important Concepts
  4. Electric Current and Its Effects Class 7 Science Chapter 10-Topics
  5. Importance Of NCERT Solutions For Class 7 Science Chapter 10 Electric Current And Its Effects:
  6. NCERT Solutions for Class 7 Subject Wise
NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects
NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

Download the PDF of NCERT Solutions for Class 7 Science Chapter 10 Electric Current and Its Effects

Download the free PDF of Class 7 Science Chapter 10 Electric Current and Its Effects NCERT solutions for CBSE exams. Perfect for easy revision and exam preparation.

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NCERT Solutions For Class 7 Science Chapter 10 Electric Current and Its Effects: Exercise Question and Answer

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

Answer:

Symbols for various components of electrical circuits are-

Electric Components Symbols
Connecting Wires 1596115279305
Switch OFF position 1596115286899
Bulb 1596115307868
Cell 1596115315968
Switch ON position 1596115322729
Battery 1596115330191

2. Draw the circuit diagram to represent the circuit shown in Fig.10.21.

electric circuit combination of cell bulb and switch

Answer:

In the above figure, one end of the cell is connected to bulb and the other is connected to switch. The switch is in OFF position. One end of the bulb is connected to switch and the other is with the cell.
The circuit diagram of the above-given figure is-

1596115619804

3. Fig.10.22 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.

electric cell

Answer:

To make a battery from the four cell we need to connect the one positive end of a cell to the negative end of the other cell. In this way, we can form a four-cell battery.

1596116187027

4. The bulb in the circuit shown in Fig.10.23 does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

electric circuit

Answer:

The problem in the above circuit diagram is that cells are not connected properly, both the positive terminal of a cell is connected. To glow bulb, the positive end of the cell must be connected with the negative end of the other cell. As shown in the figure:-
electric circuit combination of cell and bulb

5. Name any two effects of electric current.

Answer:

The two effects of electric current are-
(i) Heating effect- When current is passing through the wires, the wires become hot and produces heat.

(ii) Magnetic Effect - When current is passing through the wires, it behaves like a magnet.

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

Answer:

When the current is passing through the wires, it behaves like a magnet and rises to a magnetic field around it which exerts a magnetic force on the compass needle and reflects it from North-South position.

7. Will the compass needle show deflection when the switch in the circuit shown by Fig.10.24 is closed?

Circuit combination of compass and bulb

Answer:

No, Because in the above circuit diagram there is no source of current supply like battery or cell. In the absence of current wire will not act as a magnet, and hence needle will not show any deflection.

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_____________ .

Answer:

(a) Positive
(b) Battery
(c) Produces heat (due to the heating effect of current)
(d) Fuse (When a large amount of current is flowing through the wire, it melts and break the circuit)

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)

Answer:

(a) False, Negative terminal should be connected to the positive terminal of the other cell

(b) True, The wire of fuse is of low melting point. So, when the heat due to current is higher than a certain limit, it melts quickly and breaks the circuit

(c) False, A magnet always attracts the iron piece.

(d) True,

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

Answer:

No, because the plastic bag is non-magnetic in nature and hence it is not attracted by the electromagnets from the garbage heap.

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.

Answer:

No, I m not agree with the electrician because the fuse wire should have a low melting point. So, that it can quickly melt and break the circuit.

The ordinary wire has a high melting point as compare to fuse wire. Thus it cannot be used in fuse wires.

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.

Answer:

The following defects may be presents in the circuits-

  • The rubber band used in the cell holder may not be tight enough to keep the cells in proper contact.
  • The two cells may not be properly connected. We must connect the negative terminal to the positive end of the other cell.
  • The bulb may be fused.
  • Circuit connection may be loose. etc

13. In the circuit shown in Fig. 10.25

Electric circuit combination of three bulb

(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?

Answer:

(i) No, because the circuit connection does not compete for any bulb so, that flow of current is not possible.

(ii) Bulbs will glow simultaneously

All the bulbs will glow at once.

Chapter 10 of class 7 science includes thirteen questions all solved by Careers360 subject matter experts in simple language with clear step-by-step explanations, as per the latest CBSE syllabus (2025–2026). Students can also download the solutions in PDF format for easy access and quick revision anytime anywhere.

Chapter-wise NCERT solutions of class 7 science

Apart from class 7 science ch 10 question answer, students can access complete chapterwise solutions for class 7 science by clicking on the given chapterwise link.

Electric Current and Its Effects Class 7 NCERT Solutions: Important Concepts

1. Electric Circuit: A complete path through which electric current flows, usually consisting of wires, a cell or battery, a switch, and an electric appliance like a bulb.


2. Heating Effect of Current: When electric current flows through a conductor, it produces heat. This is used in devices like electric heaters, toasters, and irons.


3. Magnetic Effect of Current: Electric current also creates a magnetic field. This principle is used in making electromagnets and electric bells.


4. Electromagnet: A temporary magnet made by winding a wire around a soft iron core and passing current through it. It is used in cranes, electric bells, and some medical equipment.

Electric Current and Its Effects Class 7 Science Chapter 10-Topics

Topics for electric current and its effects class 7 questions and answers are listed below:

  • Symbols of Electric Components
  • Heating Effect of Electric Current
  • Magnetic Effect of Electric Current
  • Electromagnet
  • Electric Bell

Importance Of NCERT Solutions For Class 7 Science Chapter 10 Electric Current And Its Effects:

With step-by-step NCERT solutions for Class 7 Science Chapter 10, "Electric Current and Its Effects," you can easily understand important concepts and study for advanced exams. Solutions to all the crucial topics are included, and you may even get the same questions in your final exam.

NCERT Solutions for Class 7 Subject Wise

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Questions (FAQs)

1. Whether the Class 7 Science chapter 14 electric current and its effects is useful in higher studies ?

Yes, this chapter is very important for higher studies in the field of science and electrical engineering. Electricity is studied in Class 10 and 12 NCERT syllabus.

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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