Force and Pressure — Science STD 8 — Question

What is the role of microorganisms in the production of biogas?

Mention the name given to the maximum displacement of a vibrating body from its central position.

Why do only male gametes have a tail?

Give names of two traditional methods and two modern methods of irrigation.

Which hormone lowers the blood sugar in humans? Name the gland which secretes this hormone.

Some words (underlined) in the following sentences are jumbled up. Write them in their correct form.Some substances on combustion produce thea and mafel.

What type of pressure is involved in the filling of a liquid in a syringe?

Three different vibrating objects produce three types of sounds X, Y and Z. The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X can be heard by a bat whereas sound Y can be heard by a rhinoceros. What type of sounds are X, Y and Z?

Can we make another tester which can detect a weak current?

Name the petroleum product used to drive heavy vehicles.