GK INFOPEDIA

[1] Who measured the velocity of light first? A. Galileo B. Newton C. Romer D. Einstein Ans: Romer Explanation : Galileo is often credited with being the first scientist to try to determine the speed of light. Galileo’s experiment was carried out by the Accademia del Cimento of Florence, Italy, in 1667, with the lanterns […]

[1] A light year is a measure of : A. Speed B. Velocity C. Distance D. Time Ans: Distance Explanation : A light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (TAU), a light-year is the distance that light […]

[1] Tape recorder should not be kept near one of the following things – A. Clock B. Magnet C. Electrical switchboard D. Radio Ans: Magnet Explanation : The cassette tape contains a magnetic strip wound around two spools. Tiny magnetic particles are randomly scattered throughout the tape. A tape recorder should not be kept near […]

[1] The theory of inheritance of acquired characters was propounded by – A. Charles Darwin B. Gregor Mendel C. J. B. Lamarck D. Weismann Ans: J. B. Lamarck Explanation : Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime […]

[1] Elecronegativity is the measure of – A. Metallic character B. Non-metallic character C. Basic Character D. None of these Ans: Non-metallic character Explanation : Electronegativity cannot be directly measured and must be calculated from other atomic or molecular properties. Several methods of calculation have been proposed, and although there may be small differences in […]

[1] When water freezes its density – A. Decreases B. Becomes Zero C. Remains constant D. Increases Ans: Decreases Explanation : Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the […]

[1] Fuse wire is made of an alloy of – A. Tin and Lead B. Tin and Copper C. Lead and Copper D. Copper and Silver Ans: Tin and Lead Explanation : The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over […]

[1] Flywheel is an important part of a steam engine because it – A. gives strength to the engine B. accelerates the speed of the engine C. helps the engine in keeping the speed uniform D. decreases the moment of Inertia Ans: helps the engine in keeping the speed uniform Explanation : A flywheel is […]

[1] The threshold frequency is the frequency below which – A. photo current is constant B. photo current increases with voltage C. photo current decreases with volt D. photo electric emission is not possible Ans: photo electric emission is not possible Explanation : The photoelectric effect is the emission of electrons by substances, especially metals, […]

[1] Water cannot be used to extinguish fire caused by electric current, because – A. it may cause electrocution B. it may cause hydrolysis C. it may cause electrolysis D. it may spoil the wiring Ans: it may cause electrocution Explanation : Using water for putting out electric fires is risky, as the firemen can […]