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 …
Q1. What type of mirror is used by motorists to see the road behind them ? (a) Convex (b) Concave (c) Plane (d) Concavo-convex (UPSC Prelims 1980) Answer: (a) Convex Explanation: Convex mirrors provide a wider field of view, allowing motorists to see more area behind them, making them ideal for rear-view mirrors.
Q1. Unit of distance used in navigation is (a) Nautical mile (b) Kilometre (c) Light year (d) Yard (UPSC Prelims 1980) Answer: (a) Nautical mile Explanation: A nautical mile is the standard unit in marine and air navigation, equivalent to 1.852 kilometers, based on the Earth’s circumference. Q2. Distance of stars is measured in(a) Light …
Q1. Farakka agreement between Bangladesh and India implies (a) Sharing of river water of Ganges (b) Free navigation (c) Mutual understanding of border areas (d) A peace treaty Answer: (a) Sharing of river water of Ganges Explanation: The Farakka agreement was signed to resolve disputes over the distribution of Ganges water, ensuring equitable sharing between …
Q1. Skylab crashed on July 11, 1979 in (a) Pacific Ocean (b) Atlantic Ocean (c) Mediterranean Sea (d) Indian Ocean near western Australia (UPSC Prelims 1980) Answer: (d) Indian Ocean near western Australia Explanation: Skylab, America’s first space station, re-entered Earth’s atmosphere and crashed in the Indian Ocean near western Australia, marking the end of …