Chemical Effect of Electric Current solved MCQs

1. In LEDs, the longer lead (wire) is always connected to the _______ terminal

a. negative

B. neutral

c. positive

d. Any terminal

2. Tap water is a good conductor of electricity while distilled water is not because

a. Tap water contain salts

B. Distilled water do not contain salt

c. Only a) is correct

d. Both a &b is correct

3. When electrodes are immersed in water and electricity passed, the bubbles formedon the positive terminal is actually _______ gas.

a. Hydrogen

B. Carbon di oxide

c. Oxygen

d. Nitrogen

4. When electrodes are immersed in water and electricity passed, the bubbles formedon the negative terminal is actually _______ gas.

a. Hydrogen

B. Carbon di oxide

c. Oxygen

d. Nitrogen

5. Why do we add little dilute sulphuric acid to copper sulphate solution duringelectroplating?

a. To increase acidity

B. To increase conductivity

c. So that the colour becomes more prominent

d. To burn copper sulphate

6. A coating of _________is deposited on iron to protect it from corrosion andformation of rust

a. copper

B. aluminium

c. Zinc

d. silver

7. Chromium plating is done on many objects such as car parts, bath taps, kitchen gasstove etc. Why?

a. It does not corrode but prevents scratches

B. It looks beautiful

c. It costs less

d. Articles can be sold at higher price

8. The process of depositing a layer of any desired metal on another material bymeans of electricity is called ___________.

a. Electric plating

B. Electroplating

c. Electric depositing

d. None of the above

9. Some liquids are good conductors of electricity and some are poor conductors.Which one is a poor conductor?

a. Acidic solution

B. Alkaline solution

c. Common Salt solution

d. Distilled water

10. Tin cans, used for storing food, are made by electroplating tin onto iron. Why?

a. Tin gives a shiny appearance

B. To make the vessel cheap

c. Tin is less reactive than iron.

d. To make the vessel lighter

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