Sound — Science STD 8 — Question

Give two examples each of (i) solid fuels and (ii) liquid fuels.

A simple pendulum makes 10 oscillations in 20 s. What is the time period and frequency of its oscillations?

Figure shows a man with a parachute. Name the force which is responsible for his downward motion. Will he come down with the same speed without the parachute ?

Paheli wants to know whether only big animals are facing the danger of extinction ?

Explain how, the use of pesticides in agriculture causes water pollution.

Why is iron mineral needed by our body? Name some of the iron-rich foods.

Boojho asked the farmer that there were other plants growing along with wheat. He wanted to know if they had been purposely grown ?

State one way in which the planets can be distinguished from the stars in the night sky.

Prepare a list of objects around you that are electroplated.