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
An electric cell produces electricity from the
  • A
    Charge stored in it.
  • B
    Chemical stored in it
    Correct
  • C
    Kinetic energy stored in it
  • D
    Mechanical energy stored in it.
2
Inside the torch two or more cells are placed with
  • A
    Negative- negative- positive
  • B
    Positive- positive- negative- negative.
  • C
    Positive
    Correct
  • D
    Negative
3
Which of the following lightening device uses comparatively less energy?
  • A
    Compact fluorescent lamp
    Correct
  • B
    Bulb
  • C
    Filament rod
  • D
    Tube light
4
While checking your tester, do not join its free ends for more than a few seconds otherwise
  • A
    Cells of the battery heat faster
  • B
    Bulb of the tester get fused
  • C
    Cells of battery drain very quickly
    Correct
  • D
    Conductors get heated
5
Which of the following group contain only conductor?
  • A
    Sea water, tap water, distilled water
  • B
    Copper, graphite, silver
    Correct
  • C
    Copper, woolen cloth, graphite
  • D
    Rubber, copper, silver
6
ISI marks ensure that appliance is safe and wastage of energy is
  • A
    Maximum
  • B
    Not at all
  • C
    Negligible
  • D
    Minimum
    Correct
7
A battery is used to
  • A
    Maintain potential difference
    Correct
  • B
    To produce heat
  • C
    Measure electric potential
  • D
    To release electron
8
Metals are good conductor of electricity because it can
  • A
    Free electros
    Correct
  • B
    No electron
  • C
    Free proton
  • D
    Free neutron
9
Two similar charges are brought close to each other, than they will
  • A
    Repel each other
    Correct
  • B
    Attract each other
  • C
    All of these
  • D
    Neither attract nor repel
10
Chemical effect of electric current is used in
  • A
    Electroplating
    Correct
  • B
    Electric bulb
  • C
    Electromagnet
  • D
    Dynamo
11
Which types of solution do not conduct electricity?
  • A
    Sodium sulphate
  • B
    Hydrochloric acid
  • C
    Solution of glucose
    Correct
  • D
    Sodium hydroxide
12
Solution of acids are generally
  • A
    Good conductor of heat
  • B
    Super conductor of electricity
  • C
    Poor conductor of electricity
  • D
    Good conductor of electricity
    Correct
13
LEDs are
  • A
    Light emitting diodes
    Correct
  • B
    Light energy diodes
  • C
    Low energy diaphragm
  • D
    Light eliminating diodes
14
The two rods that are dipped in solution for electrolysis is called
  • A
    Conductor
  • B
    Electrolyte
  • C
    Cathode
  • D
    Electrodes
    Correct
15
The passage of an electric current through a conducting solution causes
  • A
    Change in colour
  • B
    Heating effect
  • C
    Chemical reaction
    Correct
  • D
    Change in volume