Free CBSE Class 8 Science Worksheets

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Sample CBSE Class 8 Science Worksheet Questions

1.
The chemical reaction brought about by an electric current may produce changes in the colour of the solutions.
1. TRJUE 2. false
2.
Choose the correct option: Electrolytes conduct electricity due to the movement of _________.
1. electrodes 2. atoms 3. ions 4. None of these
3.
Fill in the blanks: LED glows even when a __________ electric current passes through it.
4.
State True or False: The chemical effect of electric current is used in the purification of salts.
1. true 2. false
5.
State True or False: Adding sugar makes pure water conducting.
1. true 2. false
6.
State True or False: Distilled water is poor conductor of electricity.
1. true 2. false
7.
State True or False: Electrolysis is a chemical change.
1. true 2. false
8.
Which form of energy conversion takes place in electric cell?
9.
Which substance is produced by the electrolysis of an aqueous solution of sodium chloride?
1. Sodium carbonate 2. Sodium bicarbonate 3. Sodium hydrogen carbonate 4. Sodium hydroxide
10.
State True or False: Curd water is a good conductor of electricity.
1. true 2. false

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