Chemical Effects of Electric Current [NSO Level 1- Science Olympiad (SOF) Class 8]: Questions 5 - 9 of 65

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Question 5

Chemical Effects of Electric Current

Question

MCQ▾

The process used in extraction of metals from impure samples is called

Choices

Choice (4)Response

a.

Electroplating

b.

Electrification

c.

Electro refining

d.

Electrolysis

Question 6

Chemical Effects of Electric Current

Question

MCQ▾

Lena has made a tester using an iron rod, two wires and a bulb. If she wants to make a handle case, it is advisable that she may select

Choices

Choice (4)Response

a.

Rubber

b.

Plastic

c.

Steel

d.

Glass

Question 7

Chemical Effects of Electric Current

Question

MCQ▾

Iron cans, used for storing food are plated with tin. This is to

Choices

Choice (4)Response

a.

Prevent rusting

b.

Prevent the contact between food and iron

c.

Protect the food from spoiling

d.

All a., b. and c. are correct

Question 8

Chemical Effects of Electric Current

Question

MCQ▾

In a LED, the positive terminal of the battery is connected to the

Choices

Choice (4)Response

a.

Any lead

b.

Longer lead

c.

Shorter lead

d.

Question does not provide sufficient data or is vague

Question 9

Chemical Effects of Electric Current

Question

MCQ▾

A list of liquids are given in the table. Find out the wrong entries.

Table Shows a List of Liquids
Good ConductorsPoor Conductors
Lemon juiceVinegar
Tap waterdistilled water
Kerosenevegetable oil

Choices

Choice (4)Response

a.

Tap water, kerosene

b.

Vinegar, kerosene

c.

Lemon juice, vegetable oil

d.

Vinegar, distilled water

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