SSC CGL Previous Year Questions: General Science - 15 - SSC CGL MCQ

Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.

Light is made up of photons, so it has some particle properties. In the photoelectric effect light hits some material which absorbs it and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.

The heaviest naturally-occurring element is uranium (atomic number 92, atomic weight 238.0289).

Haptens are small molecules that react with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other large antigenic molecule. They are incomplete or partial antigens

Sulphur dioxide gas exhibits bleaching properties in presence of moisture. It dissolves in water liberating nascent hydrogen. Nascent hydrogen removes oxygen atoms from the coloring matter (reduces coloring matter) and it loses its color.

Zirconium is a lustrous, grey-white strong transition metal that resembles titanium. Zirconium is mainly used as a refractory and opacifier, although it is used in small amounts as an alloying agent for its strong resistance to corrosion.

Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.

Gypsum is calcium sulphate which is essential to the sustainability of most irrigated soils. Irrigated land eventually leads to sodicity and salinity unless extreme care is taken. It improves sodic (saline) soils by removing sodium from the soil and replacing it with calcium.

The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rayswavelength: 0.01 nm : X-rays -1 nm ; Ultra-violet Rays- O.l micrometres ; Visible Light-Red light : 0.7 micrometres. Violet Light: 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm. usually 1 cm : Radiowaves- Long, Medium and Short Waves : 2 km-l0 m ; and Very High frequency (VHF) and Ultra High Frequency (UHF): 10 m-l 0 cm.

Eutrophication is the eco-system response to the addition of artificial or natural substances, such as nitrates and phosphates through fertilizers or sewage to an aquatic system. One example is the "bloom" or great increase of phytoplankton in a water body as a response to increased levels of nutrients.

The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius

Entropy and enthalpy together make a new quantity, the Free Energy which, under conditions of constant temperature and pressure, determines the direction of spontaneous change. All spontaneous processes have a negative change in free energy

Sandstone can be turned into a metamorphic rock by being either heated up to a point where it undergoes a significant change or subjected to high pressures, or subjected to chemically active fluids, or some combination thereof. A common result of the metamorphosis of sandstone is the creation of quartzite.

A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.

Polio is a highly infectious disease caused by a virus. Its causative agent, poliovirus, was isolated in 1908 by Karl Landsteiner. The polio virus invades the nervous system, and can cause total paralysis.

It is generally considered that the Panda belongs to the bear family, though differences persist. Some DNA studies have shown that the giant panda is closer to the bear family while the red panda is indeed closer to the raccoon family.

This process usually occurs in the upper third part of the fallopian tube of the woman.

Cirrhosis is a condition in which the liver does not function properly due to long-term damage. Cirrhosis is most commonly caused by alcohol, hepatitis B, hepatitis C, and non-alcoholic fatty liver diseas

The food webs we see are grazing food chains since at their base are producers which the herbivores graze on.

Weight of 1 mole of water (H₂O) = 18 gm
Therefore, weight of 10 moles of water =180 gm

Carrot is rich in Vitamin A and it improves eyesight.

The reason for this is the hydrogen bonding between neighboring water molecules. Because hydrogen bonding is a relatively strong intermolecular force, high heat energy is required to break up the force.

Valence electrons are important in determining how an elements reacts chemically with other elements. Since the valence electrons are the electrons in the highest energy level, they are the most exposed of all the electrons, so they are the electrons that get most involved in chemical reactions

The lumen is the SI derived unit of luminous flux, a measure of the total "amount" of visible light emitted by a source.

A dissipative force counteracts motion. Its direction is opposite to the direction of the velocity vector. Dynamic friction is a dissipative (non-conservative) force. it dissipates energy (mainly through heat and sound), and energy lost by moving in one direction.

As the length increases and the cross sectional area decreases, the electrical resistance of the wire also rises.

Consequent Poles are magnetic poles that exist where the specimen has been successively magnetized in different sections to create more than two poles e.g., two north poles with one south pole between them.

Fructose, or fruit sugar, is one of the three dietary monosaccharide, along with glucose and galactose, which is absorbed directly into the bloodstream during digestion.

Methylated spirit contains mostly ethanol. Methylated spirit is a mixture of ethyl alcohol (95%) and methyl alcohol (5%). Methyl alcohol is poisonous and is added to prevent the methylated spirit being used as cheap drinking alcohol.

A sporozoite is the cell form that infects new hosts. In plasmodium, for instance, the sporozoites are cells that develop in the mosquito’s salivary glands, leave the mosquito during a blood meal, and enter liver cells (hepatocytes) where they multiply