CBSE Class 8 Science Electricity Magnetic and Heating Effects (Class 8 NCERT New) Quiz 4

1. Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

A Gold B Chromium C Zinc D Tin

2. Sugar solution is a good conductor of electricity.

A True B False

3. Chromium corrodes easily.

A True B False

4. Boojho’s uncle has set up an electroplating factory near his village.He should dispose off the waste of the factory

A in the nearby river. B in the corn field C according to the disposal guidelines of the local authority. D in the nearby pond

5. Which one of the following solutions will not conduct electricity?

A lemon juice B vinegar C tap water D vegetable oil

6. Which of the following statements is incorrect about the conductivity of water?

A Rain water is a good conductor of electricity. B On addition of table salt, water conducts electricity. C On addition of lemon juice, water conducts electricity. D Water becomes a good conductor of electricity when heated.

7. When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because

A of the heating effect of current B of the chemical effect of current C current produces magnetic field around the electrodes D current always produces air bubbles when passed through a liquid

8. Tick the chemical effect of elecric current

A boiling B motion C electro shock D Electroplating

9. Which of the following liquid is not a good conductor of electricity?

A Orange juice B Tap water C Vinegar D Honey

10. Adding common salt to distilled water makes it

A Good Conductor B Poor Conductor C No change D Both A and B