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Chemical Effects of Electric Current Practice Problems with Solutions - CBSE Grade 8

CBSE Grade 8 | Science | Chapter 11: Chemical Effects of Electric Current
Name: _________________________ Date: _________________________ Score: _______ / 40

Pushing current through a solution produces a chemical effect, and a solution that conducts is called an electrolyte, so this Grade 8 science sheet is about what electricity does inside liquids. Electroplating and a graphite answer appear in the key, along with a salt solution as a conductor.

Key Takeaways

Section A: Multiple Choice Questions (1 Mark Each)

Choose the correct option for each question.
1. The passage of electric current through a solution produces a:
(a) Chemical effect(b) Only heating effect(c) Only magnetic effect(d) No effect
2. A solution that conducts electricity is called a/an:
(a) Electrolyte(b) Insulator(c) Non-electrolyte(d) Conductor of heat
3. Which of the following conducts electricity?
(a) Distilled water(b) Salt solution(c) Sugar solution(d) Vegetable oil
4. The process of depositing a layer of one metal on another with the help of electricity is called:
(a) Electroplating(b) Electrolysis(c) Rusting(d) Magnetising
5. Which of the following is a good conductor of electricity?
(a) Plastic(b) Rubber(c) Graphite(d) Wood
6. The bulb glows in a circuit when the solution placed in it:
(a) Conducts electricity(b) Does not conduct electricity(c) Gets heated(d) Emits light by itself

Section B: Short Answer Type Questions (2 Marks Each)

Show all steps clearly.
7. Why does distilled water not conduct electricity, while tap water does?
8. What is an electrolyte? Give two examples.
9. Define electrolysis.
10. What is electroplating? Give two uses of electroplating.
11. Why are iron articles galvanised (coated with zinc)?
12. What happens when an electric current is passed through a copper sulphate solution?
13. Name the two terminals of a battery that are connected to a solution during electrolysis.
14. What is a chemical effect of electric current? Give an example from daily life.

Section C: Numericals & Word Problems (3 Marks Each)

Apply the concepts to solve the problems. Show all working.
15. A current of 2 A flows through a conducting solution for 3 minutes. Calculate the total charge that flows.
16. 300 C of charge flows through a wire in 2 minutes. Calculate the current flowing through it.
17. A current of 0.5 A flows through a circuit for 1 hour. Find the total charge that has flowed.
18. In an electroplating process, a current of 1 A flows for 10 minutes. Find the total charge used.
19. An electric bulb draws a current of 0.4 A. How much charge passes through it in 5 minutes?
20. If 150 C of charge passes through a solution in 30 seconds, calculate the current.

Answer Key

1. a) Chemical effect
2. a) Electrolyte
3. b) Salt solution
4. a) Electroplating
5. c) Graphite
6. a) Conducts electricity
7. Refer to solution guide.
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End of Worksheet

People Also Ask

What does electric current produce in a solution?

A chemical effect, option (a) in this worksheet (Q1).

What is a solution that conducts electricity called?

An electrolyte, option (a) in this worksheet (Q2).

What conducts electricity among these options?

A salt solution, from the answer key on this page.

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