Sound — Science STD 9 — Question

Gundhi bug is a pest of:

Choose the correct statement of the following:

Forest destruction results in:

1. Loss of wild life.
2. Floods and drought.
3. Soil erosion.
4. All of these.

Which among the following statement is true?

A disease transmitted through sexual contact is:

1. HIV.
2. Gonorrhoea.
3. Syphylis.
4. All the above.

Which of the following is obtained from animals?

Membrane which allows passage of only solvent through it is:

A boy of mass 50kg standing on ground exerts a force of 500N on the ground. The force exerted by the ground on the boy will be:

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

1. Air is heavier than bromine.
2. Both air and bromine have the same density.
3. Bromine is heavier than air.
4. Bromine cannot be heavier than air because it is going upwards against gravity.