The biggest planet in Solar system is?

A. Jupiter.

Most common element on the Earth crust is?

A. Oxygen.

Which of the following is used in pencils?

A. Silicon

B. Phosphorus

C. Graphite

D. None

The hardest substance available on Earth is?

A. Diamond.

The ozone layer restricts?

A. Ultraviolet radiation.

Air is a?

A. Compound

B. Element

C. Mixture

D. Electrolyte

For purifying drinking water, Alum(Phitkari) is used?

A. To kill bacteria

B. To remove salt

C. For solidification of mud

D. To Remove Gases

Digestion food begins in?

A. Stomach

B. Mouth

C. Intestine

D. Liver

Frog does not have?

A. Brain

B. Ribs

C. Heart

D. Lungs