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Concept – Conductors and Insulators

Q1. Do liquids also conduct electricity? 1

Q2 How would you classify lemon juice- a good conductor or a poor conductor of 1
electricity?

Q3 Acidified water is electrolyzed by using carbon electrodes. What is produced at: 1

(a) Positive carbon electrode?

(b) Negative carbon electrode?

Q4 What should be done to decompose water into hydrogen and oxygen? 1

Q5 Name the part of bulb that glows.

Concept – Effects of Electric Current

Q1. Name a device which glows even when a weak electric current passes through it. 1

Q2 Write the full form of LED. 1

Q3 What effect does an electric current produce when flowing through a conducting liquid 1
(or conducting solution)?

Q4 Name one compound which is decomposed into hydrogen and oxygen by using the 1
chemical effect of electric current.

Q5 What is the advantage of using LED in testing the electrical conductivity of liquids? 1

Q6 Which effect of electric current is utilized for detecting the flow of current through a 1
solution:

a) When a torch bulb is used?
b) When a compass is used?

Q7 State the three effects of electric current. 1

Concept – Chemical effect of electric current

Q1. When electric current is passed through acidified water, then hydrogen and 1
oxygen are formed. What type of effect of current is illustrated by this
statement?

Q2 Give one example of the chemical effect of electric current. 1

Q3 Name the most common application of the chemical effect of electric current. 1

Q4 Define ‘Electrolysis’. Which effect of electric current causes electrolysis? 1

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