The instrument which uses sound waves to measure the depth of oceans is (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter Answer: (2) The instrument which uses sound waves to measure the depth of oceans is sonar. Sound waves can travel much faster from one point to another. Sound waves are far more accurate for measuring … Read more
Which combination of colours is the most convenient during day and night time? (1) Orange and blue (2) White and black (3) Yellow and blue (4) Red and green Answer: (4) Red and green are the most convenient combination during day and night time because of very precise visibility. In modern colour theory, also known as … Read more
The instrument that measures and records the relative humidity of air is (1) Hydrometer (2) Hygrometer (3) Lactometer (4) Barometer Answer: (2) A hygrometer is an instrument used for measuring the moisture content in the environment. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or … Read more
The shape of our milky way galaxy is (1) circular (2) elliptical (3) spiral (4) None of the above Answer: (3) The Milky Way is a barred spiral galaxy 100,000– 120,000 light-years in diameter containing 200–400 billion stars. It may contain at least as many planets, with an estimated 10 billion of those orbiting in the … Read more
Instrument used to measure the force and velocity of the wind is (1) Ammeter (2) Anemometer (3) Altimeter (4) Audiometer Answer: (2) An anemometer is a device for measuring wind speed and is a common weather station instrument. The term is derived from the Greek word anemos, meaning wind, and is used to describe any airspeed … Read more
The different colours of different stars are due to the variation of (1) temperature (2) pressure (3) density (4) radiation from them Answer: (1). Shortly after blackbody radiation was understood, it was noticed that the spectra of stars look extremely similar to blackbody radiation curves of various temperatures, ranging from a few thousand Kelvin to ~50,000 … Read more
The fundamental scientific principle in the operation of the battery is (1) acid-base interaction (2) dialysis (3) dissociation of electrolytes (4) oxidation-reduction Answer: (3) The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons … Read more
Wollen clothes keep the body warm because (1) Wool increases the temperature of the body (2) Wool is a bad conductor (3) Wool absorbs radiant heat from outer objects (4) Wool rejects heat from the outer objects Answer: (2) It is just because woollen clothes have fibres and between those fibres air is trapped which reduces … Read more
If the length of a simple pendulum is halved then its period of oscillation is (1) doubled (2) halved (3) increased by a factor of 2 (4) decreased by a factor of 2 Answer: (4) The time period ‘T’ of a simple pendulum is given by T = 2πsqrt(l/g), where l is the length and g … Read more
Mist is caused by (1) dry ice (2) ice at low temperature (3) water vapour at low temperature (4) carbon-monoxide in solid form Answer: (3) Mist is a phenomenon caused by small droplets of water suspended in the air. It can occur as part of natural weather or volcanic activity, and is common in cold air … Read more