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
Q. The major constituent of air is
1) Nitrogen
2) Carbon dioxide
3) Oxygen
4) Hydrogen
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
Q. The hydrogen ion
1) H+
2) HO-
3) H2+
4) H3O+
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
Q. The hardest form of carbon is
1) Coke
2) Graphite
3) Diamond
4) Charcol
Q. The gas used in the manufacture of vanaspati from vegetable oil is
1) Hydrogen
2) Oxygen
3) Nitrogen
4) Carbon dioxide
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
Q. The first metal to be used by man was
1) Aluminium
2) Copper
3) Silver
4) Iron
Q. The enzyme that splits polysaccharides in the month is
1) Zymase
2) Invertase
3) Sucrose
4) Amylase
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