Explain two methods that you can use to measure the length of a curved line.

Using suitable apparatus from your laboratory separate the mixture of chalk powder, mustard oil, water and coins. Draw a flow chart to show the separation process

Describe the various features which help Camel dwell well in the desert.

Explain in detail above the applications of computer.

Suppose your normal body temperature were lower than what it is. How would the sensation of hot and cold change?

Write short notes on conductors and insulators.

When a candle is lit the following changes are observed.
a. Wax melts.
b. Candle keeps burning.
c. The size of the candle decreases.
d. The molten wax solidifies
e. Which of the changes can be reversed? Justify your answer.

Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off fire?

Draw a neat labelled diagram of a prokaryotic cell.

Why do we sweat more in summer?

How does the electromagnetic train work?

What is rainwater harvesting? Explain in a few sentences how it can be used in houses.

How are detergents manufactured?

Write a short note on noise pollution.

Comment on importance of plant animal interaction.