Class 7 Electric Current And Its Effects CBSE Questions & Answers

Class 7 · Electric Current And Its Effects

This is Science Class 7 Electric Current and its Effects CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Electric current is the flow of
  • A
    Neutron
  • B
    Proton
  • C
    Positron
  • D
    Electron
    Correct
2
Which of the following materials is a conductor?
  • A
    Silver
    Correct
  • B
    Rubber
  • C
    Cloth
  • D
    Plastic
3
Magnetic effect of electric current was observed by
  • A
    Galileo
  • B
    H.C.Oersted
    Correct
  • C
    W.H.Whitkar
  • D
    Newton
4
A device which prevents or allow the current to flow through it
  • A
    Terminal
  • B
    Switch
    Correct
  • C
    Conductor
  • D
    Motor
5
Electromagnet loses its magnetic property when
  • A
    Current is switched ON
  • B
    Current is switched OFF
    Correct
  • C
    Heat is increased
  • D
    Current is very high
6
When two or more cells are joined together it forms a
  • A
    Transistor
  • B
    Radio
  • C
    Dynamo
  • D
    Battery
    Correct
7
Electrons are ___________ particles.
  • A
    Negatively charged
    Correct
  • B
    Neutral
  • C
    Positively charged
  • D
    Current
8
Electromagnet is based on
  • A
    Heating effect of electric current
  • B
    Electro-chemical effect of electric current
  • C
    Magnetic effect of electric current
    Correct
  • D
    Chemical effect of electric current
9
Filament of electric bulb is made up of
  • A
    Tungsten
    Correct
  • B
    Copper
  • C
    Silver
  • D
    Nichrome
10
Electric current is said to be pass through a wire when
  • A
    Both electron and neutron pass through it
  • B
    No particle pass through it
  • C
    Only proton pass through it
  • D
    Only electron passes through it
    Correct
11
A ____________ is used in torches.
  • A
    Dry cell
    Correct
  • B
    Secondary cell
  • C
    Fuse
  • D
    Generator
12
MCB in electric circuit stand for
  • A
    Minimum current breaker
  • B
    Miniature circuit breaker
    Correct
  • C
    Maximum current breaker
  • D
    Molar current breaker
13
Electromagnet is used in
  • A
    Electric bell
    Correct
  • B
    Battery
  • C
    Dry cell
  • D
    Fuse
14
Electric current is measured by a device
  • A
    Galvanometer
  • B
    Voltmeter
  • C
    Odometer
  • D
    Ammeter
    Correct
15
Fuse wire is made up of alloys of
  • A
    Low boiling point
  • B
    High boiling point
  • C
    Low melting point
    Correct
  • D
    High melting point