Q1. Why camphor disappears when kept on a plate? (a) It sublimes (b) It reacts with the metal of the container (c) It reacts with the gases of the air (d) None of the above (UPSC Prelims 1981) Answer: (a) It sublimes Explanation: Camphor undergoes sublimation, meaning it changes directly from a solid to a …
Q1. The sex of the offspring is determined, when (a) The conception takes place (b) The sperm fertilises the ovum (c) The embryo is partially developed (d) The end of gestation period is near (UPSC Prelims 1981) Answer: (a) The conception takes place Explanation: The sex of the offspring is determined at the moment of …
Q1. Which organ is associated with the production of insulin in the human body? (a) Pancreas (b) Liver (c) Kidney (d) Heart Answer: (a) Pancreas Explanation: The pancreas produces insulin, a hormone that regulates blood sugar levels. Specifically, insulin is secreted by the beta cells in the Islets of Langerhans within the pancreas.
Q1. A person with which blood group will be a universal donor? (a) A (b) B (c) O (d) AB (UPSC Prelims 1981) Answer: (c) O Explanation: People with blood group O are considered universal donors because their red blood cells do not carry A or B antigens, making them compatible with all other blood …
Q1. Which of the following is commonly present in the acids? (a) Oxygen (b) Hydrogen (c) Sulphur (d) Nitrogen (UPSC Prelims 1981) Answer: (b) Hydrogen Explanation: All acids contain hydrogen ions (H⁺), which are responsible for their acidic properties. When dissolved in water, acids release hydrogen ions, making hydrogen the defining element in acidic compounds. …
Q1. Which of the following statements is true? (a) Both salinity and density of sea increase with depth (b) Both salinity and density of sea decrease with depth (c) Salinity increases but density of sea decreases with depth (d) Salinity decreases but density of sea increases with depth (UPSC Prelims 1981) Answer: (a) Both salinity …
Q1. How the body temperature is maintained ? (a) Due to temperature regulating mechanism located in the base of the brain (b) Due to excessive intake of water (c) Due to regular intake of foods (d) Due to the constant flow of blood in the capillaries (UPSC Prelims 1981) Answer: (a) Due to temperature regulating …
Q1. How dehydration helps in the preservation of food? (a) Growth of micro-organism is checked (b) Nutrients are concentrated (c) Surface of food stuffs becomes hard (d) Chemical reactions stop in the absence of water (UPSC Prelims 1981) Answer: (a) Growth of micro-organism is checked Explanation: Dehydration removes moisture, which is essential for the growth …
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Q1. Identical twins are born when (a) Two sperms fertilise one ovum (b) Two sperms fertilise two ovums simultaneously (c) One sperm fertilises the ovum and zygote divides into two separate cells developing independently (d) One sperm fertilises two ovums (UPSC Prelims 1981) Answer: (c) One sperm fertilises the ovum and zygote divides into two …
Q1. Why did Md-Bin-Tughlak change his capital from Delhi to Hyderabad/Deogiri ? (a) Because he wanted to improve trade in Deccan (b) Because he wanted to spread Islam in the Deccan (c) Because he wanted to punish the people of Delhi (d) Because he wanted to escape from Mongolian invasion (UPSC Prelims 1981) Answer: (d) …