Light — Science STD 8 — Question

The use of aluminium has increased over copper for the manufacture of electrical cables.

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Why sowing seeds with seed drill is better than broadcasting?

We must never put a sharp, pointed or hard thing into our ear.

Do not include chips, packed food and junk food as a part of regular meal during adolescence.

None of the fuels is clean fuel. Comment.

If you hold a piece of iron wire with a pair of tongs inside a candle flame or a Bunsen burner flame, what will you observe? Will it produce a flame?

Dry wastes of plants should be burried in a compost pit rather than burning.

Many people in world find it status symbol of wearing and keeping leather clothes and leather articles with them. Even Shahtoosh shawls made of an endangered species of antelope are also in greater demand and highly priced.

Do you think we must use leather items for just show off?

What is endangered species?

Can you name an extinct species which was exploited for its meat?

What values of people are shown in above paragraph?

The charge acquired by glass rod is positive when it is rubbed with silk.