Carbon and its Compounds — Science STD 10 — Question

Name any two defects of vision which can be corrected by using spectacles.

Why are we advised not to see the sun directly?

Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.

Name the conducting tissue in plants which is made of:

1. Living cells.
2. Dead cells.

Arrange the following processes involved in the nutrition in animals in the correct order (in which they take place):
Assimilation, Egestion, Ingestion, Absorption, Digestion.

What is the chemical formula of bleaching powder?

If someone is suffering from the problem of acidity after overeating, which of the following would you suggest as remedy?
Lemon juice, Vinegar, Baking soda solution Give reason for your choice.

What kind of mirror can have a focal length of, – 20cm?

Name two anti-oxidants which are usually added to fat and oil containing foods to prevent rancidity.