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Page No 174:

Question 1:

Which of the following groups of materials contain only conductors?
(a) copper, zinc, glass, plastic
(b) zinc, cotton, iron, plastic
(c) copper, gold, silver, iron
(d) glass, wood, cotton, air

Answer:

(c) copper, gold, silver, iron

Conductors are objects that allow electricity to pass through them. Copper, gold, silver and iron are good conductors of electricity.

Page No 174:

Question 2:

Which group in the above question contains only insulators?

Answer:

(d) glass, wood, cotton, air

Insulators are objects that do not allow electricity to pass through them. Glass, wood, cotton and air are bad conductors of electricity.

Page No 174:

Question 3:

When Ketaki was about to switch on the fan in her room, her mother stopped her from doing so. She told her that she should first dry her hands as they were wet, before touching the electric switch. Was Ketaki's mother right or not?
(a) Yes. The water can damage the fan.
(b) Yes. Water is a good conductor of electricity. She could get a severe shock.
(c) No. While using electric appliances and switches, wet or dry does not make any difference.
(d) No. Water is a poor conductor of electricity, hence it is safe to switch on the fan using wet hands.

Answer:

(b) Yes. Water is a good conductor of electricity. She could get a shock.

Ketaki's mother was right. Ketaki should not switch on the fan with wet hands because water is a good conductor of electricity and current can flow from the switch to Ketaki's hand. This current could give her a severe shock.



Page No 175:

Question 4:

In which of the following circuits will the bulb glow?
Figure

Answer:

(b)
The bulb will glow only when the circuit is complete. In figure (b), the circuit is complete.

Page No 175:

Question 5:

Which combination of words will fit in the blanks to complete the statement given below?
Electricity can only flow through a __________ if it is __________, and all parts of it are mode of _________.

(a) conductor, complete, metal
(b) conductor, circular, plastic
(c) circuit, complete, plastic
(d) circuit, complete, conductors

Answer:

(d) circuit, complete, conductors

Electricity can flow through a circuit if it is complete, and all parts of it are made of conductors.

Conductors are objects that allow electricity to pass through them, for example, copper. That is the reason why wires are made of copper. Electricity can flow through a complete circuit only.

Page No 175:

Question 6:

Match the items in column I to those in column II.

Column I Column II
A. Generator i. very thin wire
B. battery ii. substance through
which electricity passes
C. circuit iii. machine to produce
electricity
D. filament iv. a collection of cell
E. conductor v. path of electric
current

(a) A-iii, B-iv, C-v, D-i, E-ii
(b) A-iv, B-iii, C-v, D-i, E-ii
(c) A-iii, B-iv, C-i, D-v, E-ii
(d) A-i, B-iv, C-v, D-iii, E-ii

Answer:

(a) A-iii, B-iv, C-v, D-i, E-ii

  Column I                       Column II
A. Generator                 iii. machine to produce electricity 
B. battery                      iv. a collection of cell
C. circuit                        v. path of electric current
D. filament                     i. very thin wire
E. conductor                 ii. substance through which electricity passes

Page No 175:

Question 7:

Which of the following statements is not correct?
(a) Tall, strong towers that carry electric cables are called pylons.
(b) Car batteries are examples of secondary cells.
(c) The part of the bulb that lights up is called the terminal.
(d) A circuit is a path through which electricity flows.

Answer:

(c) The part of the bulb that lights up is called the terminal.

The part of a bulb that lights up is called filament.

Page No 175:

Question 8:

Explain why the bulb will not light in the circuit shown in the figure.
Figure

Answer:

The bulb will not light in the circuit because one of the wires is connected to the wooden handle. Wood is a bad conductor of electricity; therefore, current cannot pass through it. The circuit remains incomplete; therefore, the bulb will not glow.

Page No 175:

Question 9:

Draw a neat, labelled diagram of a dry cell that has been cut open.

Answer:

Cross-section of a dry cell

Page No 175:

Question 10:

Differentiate between a primary cell and a secondary cell.

Answer:

Primary cell Secondary cell
These cells cannot be recharged. These cells can be recharged repeatedly by connecting them to a source of electricity.
Torch cell is an example of primary cell. Car battery is an example of secondary cell.



Page No 176:

Question 11:

(a) What is a conductor?
(b) A student placed a piece of insulated copper wire between X and Y. The bulb did not light up. What do you think might be the reason for this?
Figure
(c) Which of the following would allow the bulb to light up if they were connected between X and Y: an iron wire, a glass rod or a steel spoon.

Answer:

(a) Objects that allow electricity to pass through them are called conductors, for example, copper, zinc, iron and aluminium.

(b) An insulated copper wire will not allow electricity to pass through it. The circuit will not be complete. Therefore, the bulb will not glow. 

(c) An iron wire and a steel spoon would allow the bulb to light up because iron and steel allow electricity to pass through them. Glass is an insulator; it does not allow electricity to pass through it.

Page No 176:

Question 12:

(a) Why must the plastic or rubber coverings from the ends of wires be removed before making connections? What is the covering called?
(b) Explain why workers of the electricity department wear rubber gloves when they work on the electric poles?

Answer:

(a) Plastic or rubber coverings are called insulation because they prevent the ends of wire to come in contact with each other. Before making a connection, these insulations are needed to be removed to complete the circuit.

(b) Rubber is an insulator. In other words, rubber does not allow electricity to pass through it. Workers of the electricity department wear rubber gloves so that they do not get an electric shock while working on electric cables.



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