Page 133 - Genius Kidz Prudence Learning Sc-8

EXERCISE
EXERCISE

1. Multiple choice question.

(a) Distilled water can generate electric current of _______________ .
(i) 0A (ii) 10A (iii) 5 A (iv) 1A

(b) _______________ is used as an electrolyte in a dry cell.
(i) Ammonium chloride (ii) Lemon Juice
(iii) Zinc cloride (iv) Both (i) and (ii)

(c) _______________ is a poor conductor.
(i) Tap water (ii) Lemon Juice (iii) Salt solution (iv) Pure water

2. Fill in the blanks.
1. Electrolysis is ___________

2. ___________ is the commercial application of electrolysis.
3. Orange juice is ___________ conductor.

4. Electric current produces ___________ , ___________ and ___________ effects.
3. Match the columns.

Column A Column B
(a) Cathode (i) Positive ions
(b) Anode (ii) Positive electrode
(c) Electrolyte (iii) Negative ions

(d) Cations (iv) Negative electrode
(e) Anions (v) Lemon juice

4. Mark the statements as True /False .
(a) Electric current can deflect a magnetic needle
(b) Current of OA is produced by an ion.

7. Very short answer type questions.

(a) Define electrolysis
(b) Define conducting power of a conductor.

8. Short answer type questions.
(a) How can the process of electrolysis can help in refining of a metal.

(b) Explain the relationship between heating and electric current.

9. Long answer type questions.
(a) What do you mean by electroplating and what is its need?

(b) Why is it that the bulb does not glow strongly when the wires are dipped in 90% pure water.

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