General Science MCQ For Competitive Exams

We observe on the paper that the sunlight is split into a spectrum of colours like a rainbow, every colour in VIBGYOR i.e., violet, indigo, blue, green, yellow, orange and red can be seen. The conclusion drawn here is that sunlight is nothing but a mixture of seven colours.

Atom bomb is based on the principle of nuclear fission .. The atom bomb is based on the principle of nuclear fission. EXPLANATION: Nuclear fission is a form of nuclear reaction where the nucleus inside an atom is split into fragments with mass and at the same time expelling a huge amount of energy.

A nuclear reactor coolant is a coolant used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. Light or heavy water ,Helium and Liquid Sodium can be used as coolant in a nuclear reactor.

Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.

Nylon, the first synthetic fiber in the “fully synthetic” sense of that term, was developed by Wallace Carothers, an American researcher at the chemical firm DuPont in the 1930s. It soon made its debut in the United States as a replacement for silk, just in time for the introduction of rationing during World War II.

Soaps are water soluble, fatty acid sodium salts. Soaps are made of fats and oils, or they are fatty acids, using solid alkali (a base) to handle them. The most widely used process for making soap is the making of fats and oils.

Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators.

Artificial silk or art silk is any synthetic fiber which resembles silk, but typically costs less to produce. Frequently, “artificial silk” is just a synonym for rayon. When made out of bamboo viscose it is also sometimes called bamboo silk.

Chlorine is not used for preparing blue – black ink.

Glass is mixture of Sand and silicates

Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning of candle are chemical changes because here the chemical composition of the substance changes.

$1$ $hp=745.699872W$.

Atmospheric pressure is measured in bar.

A chronometer measures Time.

A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 m), used especially for measuring the depth of water. … Formerly, the term was used for any of several units of length varying around 5–5 ¹⁄₂ feet (1.5–1.7 m).

The unit of current is ampere. The instrument used to measure current is called ammeter.

Fathom, old English measure of length, now standardized at 6 feet (1.83 metre), which has long been used as a nautical unit of depth.

Among the given units watt is the unit of power whereas all others are the units of energy.

Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.

In rail terminology, a fish plate, splice bar or joint bar is a metal bar that is bolted to the ends of two rails to join them together in a track. The name is derived from fish, a wooden bar with a curved profile used to strengthen a ship’s mast.

A jet engine works on the principle of conservation of linear momentum.

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it “straightens” the direction of current.

Traditionally the card is divided into thirty-two points (known as rhumbs), although modern compasses are marked in degrees rather than cardinal points. The glass-covered box (or bowl) contains a suspended gimbal within a binnacle.