SSC CGL Previous Year Questions: General Science - 4 - SSC CGL MCQ

Brine is a solution of excess salt and water. The high salt content in brine prevents the growth of Bacteria and thus helps to preserve the food for a long time.

Automobile Battery primarily causes lead pollution which is harmful for environment.

Montreal protocol is an international treaty signed on 14 september 1987 to protect the ozone layer.

Super sonic jets cause th ining of O₃ layer wh ich protects earth from harmful sun radiation.

Biogas is for med thr ough Fer men tation in wh ich anaerobic digestion takes place inside a closed system.

Notes: The process of slow and uniform cooling of hot metals in metallurgy is known as annealing. It is a heat process whereby a metal is heated to a specific temperature /colour and then allowed to cool slowly. This softens the metal which means it can be cut and shaped more easily. Using annealing, mild steel is heated to a red heat and allowed to cool slowly.

Ethanol which is a viable bio-fuel can be obtained from Sugarcane.

Distant objects can be seen with help of Telescope. It is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation. (such as visible light).

Orientation/Steric factor. According to the collision model, a chemical reaction can occur only when the reactant molecules, atoms, or ions collide with more than a certain amount of kinetic energy and in the proper orientation.

Brown Rin g test is used for th e detection of ionic nitrates.

Calcium is an important component of  blood clotting cascade. If normal amounts of calcium, platelets and tissue factors are present, Prothrombin is converted to Thrombin. Thrombin helps in blood coagulation or thrombus formation.

Analytical Engine was the world’s first general purpose computer which was used to perform analytical operations.

The cerebrum is the largest part of the human brain, making up about two – third of the brain’s mass.

Pancreas is a vital part of digestive system and a critical controller of Insulin.

Ascorbic Acid is not related to vitamin B complex group. Vitamin B complex group contains 8 water soluble. Vitamins–Vitamin B1, B2, B3, B6, B12, folate, biotin and pantothenic acid.

A virus is made up of a core of genetic material either DNA or RNA. Capsid is made up of protein.

Sunflower is a Large plant and is not a shrub.

Biopsy, is a medical procedure during which a small sample of tissue is removed from a part of the body.

A Cryogenic rocket engine is a rocket engine that uses cryogenic fuel or oxidizer, its fuel are liquefied gases and stored at very low temperature

During photosynthesis light energy is converted into chemical energy. The light energy is intercepted by chlorophyll, then some of the light energy is converted to chemical energy. During the process; a phosphate is added to a molecule to cause the formation of ATP.

Cohesive force between molecules is the reason of surface tension of liquid. Cohesive force is the action or property of like molecules sticking together.

Reduction is the process of gain of electrons.

Solder is an alloy made up of Tin and lead. Solder is used to create a permanent bond between metal work pieces.

Carbon dioxide is a gas which leads to Global warming. Global warming is the rise in the average temperature of the Earth's climate system.

Penicillin is a group of antibiotics derived originally from genus of fungus Penicillium.

The colour of a star is a major Indicator of its surface temperature.

The atomic number of an element refers to the number of protons present in the nucleus of that atom. Based on atomic number the elements are placed in the periodic table.

DPT is a class of vaccines known as combination vaccines due to presence of components which provide immunity against three major infectious diseases in humans. These are diphtheria, pertussis (whooping cough), and tetanus.

High grade (HG) and Ultra high grade (UHG) anthracite are the highest grades of anthracite coal.

Diode is an important electrical component which function as rectifier by allowing the flow of current in only one direction. The most common type of diode uses a p-n junction. In circuit diagrams, a diode is represented by a triangle with a line across one vertex.