Q1. Heavy rainfall affects soil by (a) Increasing its acidity (b) Increasing its alkalinity (c) Reducing its fertility (d) None of these (UPSC Prelims 1980) Answer: (c) Reducing its fertility Explanation: Heavy rainfall can cause soil erosion, washing away nutrients, and leading to reduced fertility, especially in unprotected or sloped areas. Q2. Gypsum is added …
Q1. Doldrums refer to (a) A belt of calm and light variable winds near the equator (b) A particular area in the centre of the Pacific Ocean (c) The region of the upper atmosphere extending upward from the tropopause to about 20 kms. above the earth (d) None of these (UPSC Prelims 1980) Answer: (a) …
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Q1. In which type of rocks, fossils are more abundantly found ? (a) Igneous (b) Metamorphic (c) Sedimentary (d) None of these (UPSC Prelims 1982) Answer: (c) Sedimentary Explanation: Sedimentary rocks form from layers of deposited material, often preserving organic remains, making them the primary source of fossils. Q2. Generally speaking, all rocks may be …
Q1. Radar is used for (a) Detecting objects by using light waves (b) Reflecting sound waves to detect objects (c) Determining the presence and location of objects with radio waves (d) Tracking rain-bearing clouds (UPSC Prelims 1980) Answer: (c) Determining the presence and location of objects with radio waves Explanation: Radar uses radio waves to …
Q1. When iron rusts, the weight (a) Increases (b) Decreases (c) Remains the same (d) First increases then decreases (UPSC Prelims 1980) Answer: (a) Increases Explanation: Rusting is a chemical reaction where iron combines with oxygen, forming iron oxide, which adds mass, causing the weight to increase. Q2. What is the difference between an explosion …
Q1. Stainless steel contains which of the following ? (a) Aluminium and Zinc (b) Chromium and Carbon (c) Zinc and Mercury (d) Copper and Cadmium (UPSC Prelims 1980) Answer: (b) Chromium and Carbon Explanation: Stainless steel is an alloy primarily made of iron, chromium, and carbon, where chromium provides corrosion resistance and carbon adds strength. …
Q1. Isotopes of the same element differ in the number of (a) Protons (b) Neutrons (c) Electrons (d) Positrons (UPSC Prelims 1980) Answer: (b) Neutrons Explanation: Isotopes have the same number of protons but differ in the number of neutrons, resulting in different atomic masses but similar chemical properties. Q2. Mesons are found in (a) …
Q1. Neil Armstrong was the first person to reach on the moon. While walking on the moon (a) His mass remained the same but weight increased (b) His mass remained the same but weight decreased (c) His mass as well as weight decreased (d) His mass increased but weight remained the same (UPSC Prelims 1980) …
Q1. Green colour of plants is due to the presence of (a) Chlorophyll (b) Sugar (c) Mitochondria (d) Xylem (UPSC Prelims 1980) Answer: (a) Chlorophyll Explanation: Chlorophyll is the green pigment in plants that plays a key role in photosynthesis, absorbing sunlight to convert into chemical energy. Q2. Which of the following crops has the …
Q1. The heater element in an electric iron is made of (a) Nichrome (b) Tungsten (c) Copper (d) Iron Answer: (a) Nichrome Explanation: Nichrome, an alloy of nickel and chromium, is used in heater elements due to its high resistance and ability to withstand high temperatures without oxidizing. Q2. What is the function of a …