SSC CGL Previous Year Questions: General Science - 6 - SSC CGL MCQ

Bacteriophages are viruses that infect and feed on bacterial host.

The measure of dispersion shows the scatterings of the data. It tells the variation of the data from one another and gives a clear idea about the distribution of the data. Measure of dispersion, is used to describe the variability in a sample or population and generally used in conjunction with a measure of central tendency

The soil particles absorb the water from the surroundings through the process of capillary action.

H₂SO₄ comprises about 60 per cent of the acid components of acid rains. It is produced by the combustion of coal and oil in power plants, smelters etc.

LD₅₀ is the amount of a drug or any test material which causes the death of 50% of a group of test animals under the standard test conditions.

Electric current is measured using a device called as ammeter.

Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals. It affects Flowering,Vegetative growth and fruiting in plants.

The correct match is as follows:
Ascorbic acid- Vitamin C
Chlorophyll- Photosynthetic pigment
Carotenoid- Quencher
Superoxide dismutase- Enzyme

Allantois is a membrane around developing embryo which is primarily involved in nutrition exchange and excretion.

Haliotis belongs to Mollusca.

Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA. This genetic material is known as mitochondrial DNA or mtDNA

First class proteins contain all the essential amino acids in sufficient amounts.Animal proteins obtained from milk, egg, fish, meat etc. are first class proteins. These are also called adequate proteins.

Needle exerts more pressure than nail on the balloon.

The speed of sound is greater in moist air than in dry air because moist air have larger density than dry air. Velocity of sound is directly proportional to the density of the medium in which it travels.

X rays are frequently used to check the defects in Diamonds and other precious stones

When ice is kept on saw dust then it does not melt quickly as it's an insulator of heat and air does not circulate in good insulators. So, it prevents ice from melting quickly .

When a drop of Glycerol is added to crushed KMnO₄ spread on a paper there is a violent explosion.

A bleaching agent is a material that lightens or whitens a substrate through chemical reaction. The most common bleaching agents generally fall into two categories: chlorine and its related compounds (such as sodium hypochlorite) and the peroxygen bleaching agents, such as hydrogen peroxide and sodium perborate.

Alpha particles are the least penetrating as they are the most densely ionizing. The penetrating power of nuclear radiation depends upon the ionizing power of the radiation. The more localised the ionization the less penetrating power it will possess.

Hydrogen- peroxide is an effective sterilizing agent. Water results when it readily loses active oxygen.

The maximum fixation of solar energy is done by green plants.The energy is stored in the plants as carbohydrates for their metabolic activities as growth,respiration etc.

The term 'brown air' is used for photochemical smog. The brown color is cause by the presence of a various Nitrous Oxides.

Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas.

Wave particle duality is a quantum mechanics effect. It means the electron sometimes acts like a particle and sometimes it acts like a wave. It depends on the situations.

Vitamin B₁₂ consists of a class of chemically related compounds (vitamers). It contains the biochemically rare element cobalt.

In 1904 the German agronomist and plant physiologist Lorenz Hiltner first coined the term "rhizosphere" to describe the plant-root interface, a word originating in part from the Greek word "rhizo", meaning root. Hiltner described the rhizosphere as the area around a plant root that is inhabited by a unique population of microorganisms influenced, he postulated, by the chemicals released from plant roots.

Reverse transcription were discovered by Howard Temin and independently isolated by David Baltimore.

Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.

Fructose is the sweetest of all natural sugar types.

Zone melting, any of a group of techniques used to purify an element or a compound or control its composition by melting a short region (i.e. zone) and causing this liquid zone to travel slowly through a relatively long ingot, or charge, of the solid.