Soil — Science STD 7 — Question

Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange juice in this situation and why?

Observe the formation of shadows by a glass plate, an wooden piece and a tracing paper and record your result.

What are the laws of reflection?

Explain the different types of inorganic and organic impurities generally present in sewage.

Draw a diagram of stomata showing guard cells in it.

Give two examples of physical changes.

If you are given a colourless liquid, how will you find out if it is an acid or a base without tasting it?

A farmer was unhappy because of his low crop yield, He discussed the problem with an agricultural scientist and realised that the soil of his field was either too acidic or too basic. What remedy would you suggest the farmer to neutralise the soil?

You used two cells in a torch but it does not work. What could be wrong?

Write any five uses of non-metals in everyday life.