NCERT Solutions for Class 7 Science Chapter 10 Electric Current and its Effects
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Book Name: Science
Subject: Science
Chapter Number:14
Chapter Name: Electric Current and its Effects
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Book Name: Science
Subject: Science
Chapter Number:14
Chapter Name: Electric Current and its Effects
You can also bookmark this page by clicking + Save to Library icon and refer to these NCERT Solutions anytime from your account. More Detail
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Page 1
NCERT
SOLUTIONS
CLASS - 7TH
aglase .co
SOLUTIONS
CLASS - 7TH
aglase .co
Page 2
Book : Science Ncert Solutions | Chapter-14 Science
Class : 7th
Subject : Science
Chapter : 14
Chapter Name : Electric Current and its Effects
Q1 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.
Page : 170 , Block Name : Exercise
Q2 Draw the circuit diagram to represent the circuit shown in gure.
Answer. In the given circuit, one terminal of the bulb is connected with one terminal of the
cell while their other terminals are connected to a safety pin. However, the safety pin is not
Page 1 of 6 Aglasem Schools
Class : 7th
Subject : Science
Chapter : 14
Chapter Name : Electric Current and its Effects
Q1 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.
Page : 170 , Block Name : Exercise
Q2 Draw the circuit diagram to represent the circuit shown in gure.
Answer. In the given circuit, one terminal of the bulb is connected with one terminal of the
cell while their other terminals are connected to a safety pin. However, the safety pin is not
Page 1 of 6 Aglasem Schools
Page 3
Book : Science Ncert Solutions | Chapter-14 Science
connected with one of the drawing pins. Thus, the circuit is not complete. Hence, safety pin
represents a switch in 'OFF' position. The circuit diagram of the given gure is shown in the
following gure.
Page : 170 , Block Name : Exercise
Q3 Figure shows four cells xed on a board. Draw lines to indicate how you will connect their
terminals with wires to make a battery of four cells.
Answer. To make a battery, the negative terminal of one cell must be connected to the positive
terminal of the next cell. The wire indicates the manner in which the given cells should be
connected with each other, as shown in the following gure.
Page : 170 , Block Name : Exercise
Q4 The bulb in the circuit shown in Figure does not glow. Can you identify the problem? Make
necessary changes in the circuit to make the bulb glow.
Page 2 of 6 Aglasem Schools
connected with one of the drawing pins. Thus, the circuit is not complete. Hence, safety pin
represents a switch in 'OFF' position. The circuit diagram of the given gure is shown in the
following gure.
Page : 170 , Block Name : Exercise
Q3 Figure shows four cells xed on a board. Draw lines to indicate how you will connect their
terminals with wires to make a battery of four cells.
Answer. To make a battery, the negative terminal of one cell must be connected to the positive
terminal of the next cell. The wire indicates the manner in which the given cells should be
connected with each other, as shown in the following gure.
Page : 170 , Block Name : Exercise
Q4 The bulb in the circuit shown in Figure does not glow. Can you identify the problem? Make
necessary changes in the circuit to make the bulb glow.
Page 2 of 6 Aglasem Schools
Page 4
Book : Science Ncert Solutions | Chapter-14 Science
Answer. The bulb in the Circuit iS not glowing because the two cells are not connected
properly. To make the bulb glow, the negative terminal of one cell Should be connected to the
positive terminal of the other cell, as shown in the given gure.
Page : 170 , Block Name : Exercise
Q5 Name any two effects of electric current.
Answer. The two effects of electric current are
(i) Heating effect of electric current
(ii) Magnetic effect of electric current
Page : 171 , Block Name : Exercise
Q6 When the current is switched on through a wire, a compass needle kept nearby gets
de ected from its north-south position. Explain.
Answer. When a current is switched on through a wire, the wire starts behaving as a magnet.
Hence, when a compass needle is placed near the given current carrying wire, it gets
in uenced by the magnetic effect of electric current and gets de ected from its North- South
position.
Page : 171 , Block Name : Exercise
Q7 Will the compass needle show de ection when the switch in the circuit shown by gure is
closed?
Page 3 of 6 Aglasem Schools
Answer. The bulb in the Circuit iS not glowing because the two cells are not connected
properly. To make the bulb glow, the negative terminal of one cell Should be connected to the
positive terminal of the other cell, as shown in the given gure.
Page : 170 , Block Name : Exercise
Q5 Name any two effects of electric current.
Answer. The two effects of electric current are
(i) Heating effect of electric current
(ii) Magnetic effect of electric current
Page : 171 , Block Name : Exercise
Q6 When the current is switched on through a wire, a compass needle kept nearby gets
de ected from its north-south position. Explain.
Answer. When a current is switched on through a wire, the wire starts behaving as a magnet.
Hence, when a compass needle is placed near the given current carrying wire, it gets
in uenced by the magnetic effect of electric current and gets de ected from its North- South
position.
Page : 171 , Block Name : Exercise
Q7 Will the compass needle show de ection when the switch in the circuit shown by gure is
closed?
Page 3 of 6 Aglasem Schools
Page 5
Book : Science Ncert Solutions | Chapter-14 Science
Answer. No.
The given circuit does not have any current source. In the absence of current, the wire does
not behave as a magnet and hence, the compass needle will not show any de ection.
Page : 171 , Block Name : Exercise
Q8 Fill in the blanks:
(a) Longer line in the symbol for 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) Longer line in the symbol for cell represents its positive terminal.
(b) The combination of two or more cells is called a battery.
To make a battery, the negative terminal of one cell is connected to the positive terminal of
the next cell and so on.
(c) When current is switched 'on' in a room heater, it produces heat.
Working of a room heater is based on the phenomenon of heating effect of electric current.
(d) The safety device based on the heating effect of electric current is called a fuse
Fuse is a safety device, which limits current in circuit and breaks the circuit if the current
exceeds its maximum limit.
Page : 171 , Block Name : Exercise
Q9 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
To make a battery of two cells, the negative terminal of one cell must be connected to the
positive terminal of the other cell.
(b) True
The wire of the fuse is made of special material which has a low melting point. When large
current passes through a fuse, it melts quickly and breaks the circuit.
Page 4 of 6 Aglasem Schools
Answer. No.
The given circuit does not have any current source. In the absence of current, the wire does
not behave as a magnet and hence, the compass needle will not show any de ection.
Page : 171 , Block Name : Exercise
Q8 Fill in the blanks:
(a) Longer line in the symbol for 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) Longer line in the symbol for cell represents its positive terminal.
(b) The combination of two or more cells is called a battery.
To make a battery, the negative terminal of one cell is connected to the positive terminal of
the next cell and so on.
(c) When current is switched 'on' in a room heater, it produces heat.
Working of a room heater is based on the phenomenon of heating effect of electric current.
(d) The safety device based on the heating effect of electric current is called a fuse
Fuse is a safety device, which limits current in circuit and breaks the circuit if the current
exceeds its maximum limit.
Page : 171 , Block Name : Exercise
Q9 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
To make a battery of two cells, the negative terminal of one cell must be connected to the
positive terminal of the other cell.
(b) True
The wire of the fuse is made of special material which has a low melting point. When large
current passes through a fuse, it melts quickly and breaks the circuit.
Page 4 of 6 Aglasem Schools
Page 6
Book : Science Ncert Solutions | Chapter-14 Science
(c) False
Working of an electromagnet is based on the magnetic effect of electric current. An
electromagnet behaves as a magnet when current passes through it. Hence, it will attract a
piece of iron.
(d) True
An electric bell has a piece of iron wound by a coil. When current passes through this coil, it
behaves as an electromagnet.
Page : 171 , Block Name : Exercise
Q10 Do you think an electromagnet can be used for separating plastic bags from a garbage
heap? Explain.
Answer. No.
Electromagnets can only attract magnetic materials. Plastic bag is a non-magnetic material
and will not be attracted by an electromagnet. Hence, an electromagnet cannot be used for
separating plastic bags from a garbage heap.
Page : 171 , Block Name : Exercise
Q11 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.
The electrician cannot be allowed to replace the fuse in the house by a piece of wire. This is
because every wire cannot be used as a fuse lament. A fuse lament must have a low melting
point such that it could melt and break in response of large amount of current. Most of the
wires have high melting points.
Page : 172 , Block Name : Exercise
Q12 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.
Page 5 of 6 Aglasem Schools
(c) False
Working of an electromagnet is based on the magnetic effect of electric current. An
electromagnet behaves as a magnet when current passes through it. Hence, it will attract a
piece of iron.
(d) True
An electric bell has a piece of iron wound by a coil. When current passes through this coil, it
behaves as an electromagnet.
Page : 171 , Block Name : Exercise
Q10 Do you think an electromagnet can be used for separating plastic bags from a garbage
heap? Explain.
Answer. No.
Electromagnets can only attract magnetic materials. Plastic bag is a non-magnetic material
and will not be attracted by an electromagnet. Hence, an electromagnet cannot be used for
separating plastic bags from a garbage heap.
Page : 171 , Block Name : Exercise
Q11 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.
The electrician cannot be allowed to replace the fuse in the house by a piece of wire. This is
because every wire cannot be used as a fuse lament. A fuse lament must have a low melting
point such that it could melt and break in response of large amount of current. Most of the
wires have high melting points.
Page : 172 , Block Name : Exercise
Q12 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.
Page 5 of 6 Aglasem Schools
Page 7
Book : Science Ncert Solutions | Chapter-14 Science
Answer. One of the reasons may be that the rubber band used in the cell holder may not be
tight enough to keep the two cells in contact with each other. If the cells are not in proper
contact with each other, then the circuit will not be complete and current will not ow
through the circuit. Hence, the bulb will not glow. The other reason may be that the two cells
are not connected properly. The negative terminal of one cell must be connected to the
positive terminal of the other cell.
Page : 172 , Block Name : Exercise
Q13 In the circuit shown in gure.
(i) Would any of the bulbs 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.
When the switch is in 'OFF' position, the current does not ow through the circuit. Hence,
none of the bulbs will glow.
(ii) Bulbs will glow simultaneously.
When the switch is moved to the 'ON' position, then all the bulbs will glow at once. This is
because they all are connected to the same battery and switch.
Page : 172 , Block Name : Exercise
Page 6 of 6 Aglasem Schools
Answer. One of the reasons may be that the rubber band used in the cell holder may not be
tight enough to keep the two cells in contact with each other. If the cells are not in proper
contact with each other, then the circuit will not be complete and current will not ow
through the circuit. Hence, the bulb will not glow. The other reason may be that the two cells
are not connected properly. The negative terminal of one cell must be connected to the
positive terminal of the other cell.
Page : 172 , Block Name : Exercise
Q13 In the circuit shown in gure.
(i) Would any of the bulbs 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.
When the switch is in 'OFF' position, the current does not ow through the circuit. Hence,
none of the bulbs will glow.
(ii) Bulbs will glow simultaneously.
When the switch is moved to the 'ON' position, then all the bulbs will glow at once. This is
because they all are connected to the same battery and switch.
Page : 172 , Block Name : Exercise
Page 6 of 6 Aglasem Schools
Document Details
| Board / Org | NCERT |
| Exam | Class 7 |
| Type | Solution |
| Pages | 7 |
| Updated | 30 Apr 2026 |