The Amazing World of Solutes, Solvents, and Solutions — Science STD 8 — Question

Name the substance whose weight produces atmospheric pressure.

Name the three main states of matter.

What kind of cells are surrounded by a cell wall?

Which part of a cell controls all the activities of the cell?

Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time ?

Why your voice is different from that of your teacher?

A bucket made of plastic does not rust like a bucket made of iron. Why?

A chapati maker is a machine which converts balls of dough into chapati’s. What effect of force comes into play in this process?

Terrycot is made by mixing two types of fibres. Write the names of the fibres.

Name the device which is used between the hubs and axles of bicycle wheels to reduce friction.