Class 7 Science
Electric Current and its Effects
Question 1.
What is a battery?
Question 2.
Give two examples in which batteries can be used?
Question 3.
What is the role of cells’ terminals for making a battery?
Question 4.
When the switch is in the ________ position, the circuit is complete.
(a) off
(b) on
(c) half on
(d) none of the above
Question 5.
When the switch is in the ___________ position, the circuit is incomplete.
(a) off
(b) on
(c) half off
(d) none of the above
Question 6.
What do you understand by filament?
Question 7.
What is the heating effect of the electric current?
Question 8.
When an electric current passes through a wire, it behaves like a _________.
(a) plastic
(b) rubber
(c) magnet
(d) fluid
Question 9.
Define electromagnet.
Question 10.
What are MCBs?
Question 11.
The coil of wire of an electric room heater is called as _____________
(a) matter
(b) object
(c) material
(d) element
Question 12.
The amount of heat produce in a wire depends on:
(a) material
(b) length
(c) thickness
(d) all of the above
Question 13.
Give two reasons for excessive currents in electrical circuits.
Question 14.
What are electrical fuses?
Question 15.
A fuse is a __________ device.
(a) safety
(b) dangerous
(c) magnetic
(d) shiny
Question 16.
An electric current can be used to make _________.
(a) magnets
(b) chair
(c) buildings
(d) pen
Question 17.
Give the working process for electric bell.
Question 18.
When an electric current passes through a wire, the wire gets heated. It is the ___________ effect of current.
(a) heating
(b) cooling
(c) balancing
(d) none of the above
Question 19.
Electric fuses _________ fires and damage to electric appliances.
(a) increase
(b) make
(c) prevent
(d) add
Question 20.
A current carrying coil of an insulated wire wrapped around a piece of iron is called a/an ______________.
(a) electromagnet
(b) electric bell
(c) electric watch
(d) none of the above
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All About Daily Practice Problems on Class 7 Science Electric Current and its Effects NCERT Chapter 14
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