While catching a ball, a player pulls down his hands to lower the– (1) force (2) momentum (3) impulse (4) catching time Answer: (2) A cricketer lowers his hands while taking a catch to decrease the rate of momentum. Cricketers increase the time by pulling their hand’s backward with the ball while taking a catch. Linear … Read more
When a barometer reading suddenly recedes, it indicates that climate– (1) will be very warm (2) will be extremely stormy (3) will remain cold (4) incessant rain for at least 48 hours Answer: (2) In summer, when the barometer falls suddenly, a thunderstorm can be expected, and if it does not rise again upon its cessation, … Read more
A particle dropped from the top of a tower uniformly falls on the ground at a distance that is equal to the height of the tower. Which of the following paths will be traversed by the particle? (1) Circle (2) Parabolic (3) Great circle (4) Hyper–parabolic Answer: (2) If a particle dropped from the top of … Read more
The Electron microscope was invented by (1) Knoll and Ruska (2) Robert Koch (3) Leeuwenhoek (4) C.P. Swanson Answer: (1) It is widely accepted that the first prototype of an electron microscope was built by Ernst Ruska and Max Knoll in 1931; it was not more powerful than an optical microscope, but it demonstrated the principle … Read more
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of : (1) evaporation (2) vaporisation (3) diffusion (4) sublimation Answer: (3) Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature … Read more
Clear nights are colder than cloudy nights because of (1) conduction (2) condensation (3) radiation (4) insolation Answer: (3) Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air whereas the cloudless nights have no protection so all the hot air rises … Read more
Speed of sound is the greatest in : (1) Water (2) Air (3) Glass (4) Glycerine Answer: (3) Sound travels faster in liquids and non-porous solids than it does in air. It travels about 4.3 times as fast in water (1,484 m/s), and nearly 15 times as fast in iron (5,120 m/s), than in air at … Read more
A gas thermometer is more sensitive than a liquid thermometer because of a gas : (1) is lighter than liquid (2) expands more than a liquid (3) is easy to obtain (4) does not change state easily Answer: (4) Gas is easily compressed so it would have a more versatile range of measurement at least in … Read more
Which one of the following is used for sunglasses? (1) Pyrex glass (2) Flint glass (3) Crooks glass (4) Crystal glass Answer: (3) A type of glass that contains cerium and other rare earth and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sunglasses are a form of protective eyewear designed … Read more
The speed of light with the rise in the temperature of medium : (1) Increases (2) Decreases (3) Remains unaltered (4) Drops suddenly Answer: (3) The speed of light with the rise in the temperature of the medium remains unaltered because the speed of light doesn’t depend on temperature. It does depend, however, on the refractive … Read more