When an iron nail gets rusted, iron oxide is formed:
(A) Without any change in the weight of the nail
(B) With increase in the weight of the nail
(C) With decrease in the weight of the nail
(D) Without any change in colour or weight of the nail
Important Questions on General Science
Match the following-
| Elements | Nature of elements |
| (a) Sodium | 1. Gas |
| (b) Phosphorus | 2. Halogen |
| (c) Iodine | 3. Alkali metal |
| (d) Radon | 4. Transition metal |
| 5. Non-metal |
codes:
| (a) | (b) | (c) | (d) | |
| (A) | 2 | 5 | 3 | 1 |
| (B) | 3 | 5 | 2 | 1 |
| (C) | 4 | 2 | 3 | 5 |
| (D) | 5 | 3 | 4 | 2 |
The hardest substance available on the earth is--
(A) Platinum
(B) Coal
(C) Diamond
(D) Gold
Actinides are the elements with atomic numbers from-
(A) 36 to 43
(B) 89 to 103
(C) 97 to 114
(D) 101 to 115
Which of the following pairs is not correctly matched?
| Mineral | Industrial use |
| (A) Zircon | Nuclear reactors |
| (B) Manganese ore | Dry battery |
| (C) Mica |
Bleaching powder |
| (D) Bauxite | Tanning |
The average salinity of sea water is-
(A) 20%
(B) 25%
(C) 30%
(D) 35%
The chemical (Ethyl Mercaptan) added to the odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
(A) Sulphur
(B) Fluorine
(C) Chlorine
(D) Bromine
The inert gas which is substituted for nitrogen in the air, used by deep sea divers for breathing is--
(A) Helium
(B) Argon
(C) Krypton
(D) Xenon
The group of metals Fe, Co, Ni may be best called as:
(A) Alkaline metals
(B) Rare metals
(C) Main group metals
(D) Transition metals
