Sound — Science STD 8 — Question

Name the most common fuel used in light motor vehicles.

What do you mean by carbonisation ?

Fill in the blanks with the help of words given in bracket after each sentence. Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).

Name any harmful product released by the burning of fuels.

During dry weather, clothes made of synthetic fibre often stick to the skin. Which type of force is responsible for this phenomenon ?

We know air is a mixture. Would a mixture of gases also be considered a solution?

A group of cells performing similar functions are known by a speciic term. What is it?

X is the reproductive cell produced in a woman's Y while Z is the reproductive cell that is produced in the testes of a man. What can X, Y and Z be ?

In which zone of a candle flame: Partial combustion of fuel takes place.

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 ?