Chemistry

1) Which was the first metal that was used by man?

a) Gold
b) Bronze.
c) Copper.
d) Iron.

ANSWER : Copper

2) Which among the following consists of the nucleus of an atom?

a) Electrons and neutrons.
b) Electrons and protons.
c) Protons and neutrons.
d) All of these.

ANSWER : Protons and neutrons

3) Among the following which law states that the amount of gas dissolved in a liquid is proportional to its partial?

a) Henry’s law.
b) Raoult’s law.
c) Dalton’s law.
d) Gay Lussac’s law.

ANSWER : Henry’s law

4) The nucleus of a hydrogen atom consists of:

a) 1 proton only.
b) 1 proton + 2 neutrons.
c) 1 neutron only.
d) 1 electron only.

ANSWER : 1 proton only

5) Which among the following is the most abundant rare gas in the atmosphere?

a) He.
b) Ne.
c) Ar.
d) Xe.

ANSWER : Ar

6) What is the use of salt in the diet?

a) Make the taste of food better.
b) Produce in small amounts the hydrochloric acid required for the digestion of food.
c) Ease the process of cooking.
d) Increase the solubility of food particles in water.

ANSWER : Produce in small amounts the hydrochloric acid required for the digestion of food

7) The luster of a metal is due to:

a) Its high density.
b) Its high polishing.
c) Its chemical inertness.
d) Presence of free electrons.

ANSWER : Presence of free electrons

8) Which is the gas that is being used in the manufacture of vanaspati from vegetable oil?

a) Hydrogen.
b) Oxygen.
c) Nitrogen.
d) Carbon dioxide.

ANSWER : Hydrogen

9) Among the following which is the most electropositive elements?

a) Na.
b) Ca.
c) K.
d) Cs.

ANSWER : Cs

10) Which is the gas that is used for artificial ripening of green fruit?

a) Carbon dioxide.
b) Acetylene.
c) Ethylene.
d) Ethane.

ANSWER : Ethylene