Class 8 Chemical Effects Of Electric Current CBSE Questions & Answers

Class 8 · Chemical Effects Of Electric Current

This is Science Class 8 Chemical Effects of Electric Current CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A device that converts the electrical energy into heat energy is
  • A
    Heater
    Correct
  • B
    Motor
  • C
    Fan
  • D
    MP3
2
Which of the following solution is best conductor of current?
  • A
    Portable water
  • B
    Rain water
  • C
    Acid water
    Correct
  • D
    Distilled water
3
Coming together of live wire and fuse wire in a circuit is called
  • A
    Earthing
  • B
    Circuit breaker
  • C
    Short circuit
    Correct
  • D
    Overloading
4
A safety device that protect electrical appliances from short circuiting and overloading is called
  • A
    Safety wire
  • B
    Live wire
  • C
    Fuse wire
    Correct
  • D
    Neutral wire
5
Which of the following safety device is used to protect us from electric shock?
  • A
    Lightening conductor
  • B
    Earth wire
    Correct
  • C
    Fuse wire
  • D
    MCB
6
In LEDs the longer lead is connected to
  • A
    Neutral terminal
  • B
    Negative terminal
  • C
    Any one
  • D
    Positive terminal
    Correct
7
Resistance is the
  • A
    Obstruction in flow of current
    Correct
  • B
    Passage of current
  • C
    Unit of current
  • D
    Heat developed
8
Chemical effect of electric current is used in
  • A
    Rusting
  • B
    Galvanizing
  • C
    Electroplating
    Correct
  • D
    Painting
9
When the free ends of tester are dipped into a solution, the magnetic needle shows deflection due to
  • A
    Flows of current
    Correct
  • B
    Lighting effect
  • C
    Magnetic effect
  • D
    Heating effect
10
Tap water is good conductor of electricity but distilled water is not because
  • A
    Distilled water is acidic
  • B
    Tap water don not contain salts
  • C
    Distilled water contain salts
  • D
    Tap water contain salts
    Correct
11
The electric conductor used for domestic use has insulation. The wire having red insulation is generally
  • A
    Live wire
    Correct
  • B
    Fuse wire
  • C
    Neutral wire
  • D
    Earth wire
12
Short circuit is caused due to
  • A
    Direct contact of live wire and earth wire
  • B
    Direct contact of neutral wire and earth wire
  • C
    Direct contact of live wire and guy wire
  • D
    Direct contact of live and neutral wire
    Correct
13
We should never handle electrical appliances with wet hand because
  • A
    Small quantity of salt make it conductor
    Correct
  • B
    Appliance may become faulty
  • C
    Appliance may slip from hand
  • D
    Appliance will not work in presence of water
14
Chromium is used to electroplate iron articles as it is
  • A
    Very cheap
  • B
    Easily available
  • C
    Do not cause pollution
  • D
    Shiny and rust free
    Correct
15
Which type of water is free from salt?
  • A
    Distilled water
    Correct
  • B
    Sea water
  • C
    River water
  • D
    Drinking water