Name some common systems of measurement.

How do sailors protect their ship during a heavy storm?

Define focal length?

Tabulate four points of difference between metals and non-metals.

Burning of fossil fuels is responsible for global warming. Justify the statement.

What are antibiotics?

Write any three economic importance of algae.

Tabulate the difference between aerobic and anaerobic respiration.

What is a Computer?

With the help of a neat diagram explain the working of a calorimeter

What is electroscope? Explain how it works?

What happens when carbon dioxide is passed through lime water? Write the equation for this reaction.

Write the chemical formula for the following compounds
a) Aluminium sulphate
b) Silver nitrate
c) Magnesium oxide
d) Barium chloride

What are antagonistic muscles? Give one example.

Explain the role of hormones in reproduction.