Microorganisms: Friend and Foe — Science STD 8 — Question

You are provided with a mixture of petroleum and water. How will you separate the two?

It is dangerous to touch the electrical switch with wet hands or while standing on a wet floor without slippers.

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?

Changes occuring in adolescent boys and girls are different.

Why oil is added while making pickle?

Two rods: A and B, having same weight and equal length have different thickness. Rod A is thinner while Rod B is thicker. They are held vertically on the surface of sand. Which one of them will sink more? Why?

Water is not used to control fires involving electrical equipment.

Thyroid gland has special significance/importance in a frog.

The tools used for cutting and piercing always have sharp edges.

It is not advisable to use an umbrella during thunderstorm