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
The electrode connected to negative terminal is called
  • A
    Cations
  • B
    Anode
  • C
    Cathode
    Correct
  • D
    Electrode
2
The substance through which current can flow easily are called
  • A
    Resistor
  • B
    Insulator
  • C
    Poor conductor
  • D
    Good conductor
    Correct
3
During electroplating, the object to be electroplated is attached with
  • A
    Electrolytes
  • B
    Anode
  • C
    Cathode
    Correct
  • D
    Anion
4
Conductor having very high resistance is
  • A
    Insulator
    Correct
  • B
    Good conductor
  • C
    Semi conductor
  • D
    Resistor
5
When common salt is dissolved in water it become more conducting because
  • A
    Water release more ions
  • B
    Sodium and chlorine ions are formed
    Correct
  • C
    Sodium chloride dissolve into water
  • D
    Water dissociate into hydrogen and oxygen
6
When LED is connected to a circuit the shorter wire is connected to
  • A
    Negative terminals
    Correct
  • B
    Any one of the terminals
  • C
    Neutral terminals
  • D
    Positive terminals
7
When electric current passes through the filaments of bulb it start emitting light due to
  • A
    Magnetic effect of electric current
  • B
    Heating effect of electric current
    Correct
  • C
    Chemical effect of electric current
  • D
    Lighting effect of electric current
8
In which material electricity do not flow flows
  • A
    Rubber materials
  • B
    Cotton materials
  • C
    Metallic materials
  • D
    Wooden materials
    Correct
9
Which of the following liquid conduct electric current?
  • A
    Honey
  • B
    Lemon juice
    Correct
  • C
    Milk
  • D
    Distilled water
10
LED is better than bulb to use in tester as
  • A
    LED give more light
  • B
    LED is cheaper
  • C
    LED glows at low electric current
    Correct
  • D
    LED gives more heat
11
Which effect of electric current is used for detecting the flow of current through solution when a torch bulb is used?
  • A
    Heating effect
    Correct
  • B
    Magnetic effect
  • C
    Lighting effect
  • D
    Chemical effect
12
Which of the following can not be used to detect the current?
  • A
    Tester
  • B
    LED
  • C
    Compass needle
  • D
    Conductor
    Correct
13
Which of the following should be added to distilled water to make it conductor?
  • A
    Alcohols
  • B
    Honey or sugar
  • C
    Acid or base
    Correct
  • D
    Rain water
14
Electric supply is shut of before using water hoses in case of fire because
  • A
    Water is good conductor of electricity
    Correct
  • B
    Bulb and tubes may got fused
  • C
    Water may damage the electric wiring
  • D
    Water is bad conductor of electricity
15
When electric current is passed through acidified water then what is produced at positive carbon electrode
  • A
    Carbon dioxide gas
  • B
    Nitrogen gas
  • C
    Oxygen gas
    Correct
  • D
    Hydrogen gas