MEDIUM
7th CBSE
IMPORTANT
Earn 100

Why is a long and thin tungsten filament used in a bulb?

Important Questions on Electricity

MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q B
Mention two problems associated with the heating effect of electric current.
MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q B
What is an electromagnet? Mention two properties of an electromagnet.
HARD
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q C
What is electrical resistance? On what does the resistance of a piece of material depend? How does resistance affect current?
MEDIUM
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q C
What is a fuse? How does it work?
HARD
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q C
Explain with the help of a diagram the construction and working of an electric bell.
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q D
The greater the _____ across a device, the greater is the current through it. (Choose from: Voltage/ EMF/ Resistance)
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q D
The connections between components are represented by _____ (Straight lines/circles) in a circuit diagram.
EASY
7th CBSE
IMPORTANT
Basic Science For Class 7>Chapter 7 - Electricity>Exercises>Q D
A long wire has _____ resistance than a short wire.