Q1. Green plants in the sea are useful for the respiration of fish because (a) They give out oxygen (b) They give out carbon dioxide (c) The give out oxygen and carbon dioxide simultaneously (d) They take oxygen and give out carbon dioxide (UPSC Prelims, 1979) Answer: (a) They give out oxygen Explanation: Aquatic plants …
Q1. Higher plants take up Nitrogen as (a) Nitrites only (b) Nitrates only (c) Nitrates and ammonia (d) Urea (UPSC Prelims, 1979) Answer: (b) Nitrates only Explanation: Higher plants absorb nitrogen primarily in the form of nitrates, which are soluble and easily transported through the soil. Nitrates are converted into amino acids and proteins, essential …
Q1. The most common substance responsible for pollution is (a) Smoke (b) Carbon dioxide (c) Sulphur dioxide (d) Carbon monoxide (UPSC Prelims, 1979) Answer: (a) Smoke Explanation: Smoke, which contains a mixture of particulate matter and harmful gases, is a major contributor to air pollution. It originates from industrial emissions, vehicle exhausts, and burning of …
Q1. You are travelling in a car and a thunder storm suddenly takes place. What will be your first step ? (a) Stop the car, get out of it and lie flat in the field (b) Stand below a tree (c) Go to a nearby wood pole and stick to it (d) Lie flat in …
Q1. The water in an open pond remains cool even in hot summer because (a) Of continuous evaporation of water (b) Water radiates heat more rapidly than the atmosphere (c) Water absorbs heat less rapidly than the atmosphere (d) Water absorbs heat more rapidly than the atmosphere (UPSC Prelims 1979) Answer: (c) Water absorbs heat …
Q1. The Vitamin responsible for anti-sterile activity is (a) Vitamin A (b) Vitamin B (c) Vitamin C (d) Vitamin D (UPSC Prelims 1979) Answer: (c) Vitamin C Explanation: Vitamin C plays a key role in cellular health, tissue repair, and immune function. Its antioxidant properties help prevent sterility-related conditions by maintaining reproductive tissue integrity and …
Q1. The content of water is greater than fats, the plasma is more than proteins, proteins are more than fats and fats less than plasma. Which constitutes the major Part of the human body ? (a) Fats (b) Water (c) Plasma (d) Proteins (UPSC Prelims, 1979) Answer: (b) Water Explanation: The human body is composed …
Q1. Gobar gas contains mainly (a) Carbon dioxide (b) Methane (c) Ethylene (d) Carbon monoxide (UPSC Prelims 1979) Answer: (b) Methane Explanation: Gobar gas, produced from the anaerobic decomposition of cow dung, primarily consists of methane, which is a combustible gas. It is used as a renewable source of energy for cooking and lighting. The …
Q1. The first metal used by the man was (a) Iron (b) Copper (c) Aluminium (d) Gold (UPSC Prelims 1979) Answer: (b) Copper Explanation: Copper was one of the earliest metals discovered and used by humans, primarily because it occurs in native form and can be easily extracted and shaped. Its low melting point and …
Q1. Solar eclipse occurs when (a) Earth comes between sun and moon (b) Moon is at right angle to the earth (c) Moon comes between sun and earth (d) Sun comes between moon and earth (UPSC Prelims 1979) Answer: (c) Moon comes between sun and earth Explanation: A solar eclipse takes place when the Moon …