It is dangerous to touch an electrical appliance with wet hands. Explain why

2

(a)

Explain, why is a layer of zinc coated over iron.

2

(a)

Since, when an electric current is passed through two solutions A and B, the bulb glows brightly for solution B and dimly for solution A. So, which of the two is a better conductor?

2

(a)

Mention the name of three liquids which can conduct electricity

2

(a)

The fresh fruits and vegetables conduct electricity to some extent. Explain why.

2

(a)

State, which one is better conductor of electricity sea water or drinking water.

2

(a)

Why is tin electroplated on iron to make cans used for storing food?

2

(a)

Name most common industrial application of chemical effects of electric current.

2

(a)

What happens when common salt is added to distilled water?

2

(a)

Which form of energy conversion takes place in electric cell?

2

(a)

Why does the bulb glows when electric current passes through it?

2

(a)

What effect does the current produce when it flows through a conducting solution?

2

(a)

The ordinary water can conduct electricity while distilled water cannot. Explain why?

2

(a)

Write a short note on LED.

2

(a)

Can some fruits and vegetables conduct electricity? Explain with an example

2

(a)