EASY
7th West Bengal Board
IMPORTANT
Earn 100

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for 10-11 Seconds. Touch the wire again and feel the temperature.

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Did the electricity pass through the nichrome wire in the second case?

Important Questions on Physical Environment

MEDIUM
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 39

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for 10-11 Seconds. Touch the wire again and feel the temperature.

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Was the rise in temperature due to a flow of electricity through the wire?

EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 40
Which energy runs a calculator? And where does it come from?
MEDIUM
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 40
Write a note about the calculator which can be run without changing a 'cell' or 'battery'.
EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 40
Where does the electricity come from a solar calculator?
MEDIUM
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 40
Do you know any device which can be run by solar energy?
MEDIUM
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 41
Write some uses of thermal energy.
EASY
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 42

Mention some uses of electric energy.

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MEDIUM
7th West Bengal Board
IMPORTANT
Environment and Science Class 7>Chapter 1 - Physical Environment>Exercise 42

Mention some uses of fossil fuels known to you.

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