The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

8.            The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

A.            granite

B.            basalt

C.            igneous rocks

D.            sedimentary rocks

Answer: Option C

9. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

A.            Dalton's law

B.            Gay Lussac's law

C.            Henry's law

D.            Raoult's law

Answer: Option C

10. The main buffer system of the human blood is

A.            H2CO3 - HCO3

B.            H2CO3 - CO32-

C.            CH3COOH - CH3COO-

D.            NH2CONH2 - NH2CONH+

Answer: Option A

11.          The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

A.            helium  B.            ozone

C.            oxygen D.            methane

Answer: Option B

12. The most commonly used bleaching agent is

A.            alcohol

B.            carbon dioxide

C.            chlorine

D.            sodium chlorine

Answer: Option C

13.          The nucleus of a hydrogen atom consists of

A.            1 proton only

B.            1 proton + 2 neutron

C.            1 neutron only

D.            1 electron only

Answer: Option A

14. The heat required to raise the temperature of body by 1 K is called

A.            specific heat

B.            thermal capacity

C.            water equivalent