Objective General Knowledge

Q. The mass number of a nucleus is
1 always less than its atomic number
2 the sum of the number of protons and neutrons present in the nucleus
3 always more than the atomic weight
4 a fraction
Ans: 2

Q. The major constituent of air is
1 Nitrogen
2 Carbon dioxide
3 Oxygen
4 Hydrogen
Ans: 1

Q. The main use of salt in the diet is to
1 make the taste of food better
2 produce hydrochloric acid in small amounts for the digestion of food
3 ease the process of cooking
4 increase the solubility of food particles in water
Ans: 4

Q. The hydrogen ion
1 H+
2 HO-
3 H2+
4 H3o+
Ans: 2

Q. The high reactivity of fluorine is due to
1 Its high electronegativity
2 Small size of flourine atom
3 Availability of d-orbitals
4 Strong f-f bond
Ans: 1

Q. The hardest form of carbon is
1 Coke
2 Graphite
3 Diamond
4 Charcol
Ans: 3

Q. The gas used in the manufacture of vanaspati from vegetable oil is
1 Hydrogen
2 Oxygen
3 Nitrogen
4 Carbon dioxide
Ans: 1

Q. The gas used for artificial ripening of green fruits is
1 Carbon dioxide
2 Acetylene
3 Ethane
4 Oxygen
Ans: 4

Q. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
1 3 billion years
2 100 years
3 0.01 minute
4 13 days
Ans: 3

Q. The first metal to be used by man was
1 Aluminium
2 Copper
3 Silver
4 Iron
Ans: 2