Page 91 - Science Class 6 Times Publication

e. Which of the following is a semi-conductor?

i. Silicon ii. Graphite

iii. Diamond iv. Silver

2. Copy the correct statement and correct the wrong statement:

a. Computer, electric heater, rice cooker and micro oven run
with electricity.
b. Cell, dynamo, and generator are loads of electricity.

c. Dry cell contains sulphuric acid.
d. Generator contains magnet and coil.
e. Open circuit is formed when switch is on.

f. Load, conducting wire and source are required to make
electric circuit.
g. Metals, plastic, green wood, etc are good conductors of
electricity.

3. Answer these questions in very short:

a. What is electricity? Give some examples of source of electricity.
b. What are the two electrodes of a simple cell?
c. How does a dry cell produce electricity?

d. What is a dynamo?
e. What is electric circuit?
f. What is open circuit?

g. What is good conductor? Give some examples of good
conductors.
h. What is insulator? Give any four examples of insulators.

4. Answer these questions:

a. Explain the structure of a dry cell with diagram.
b. Draw an electric circuit and label important parts.

c. How can you test whether a given substance is an insulator
or a good conductor?

Times' Crucial Science and Environment 87 Book 6