SSC CGL Previous Year Questions: General Science - 20 with solutions -

The plasma membrane is composed of a phospholipid bilayer. Phospholipids are lipids with a phosphate group attached to them. The phospholipids have one head and two tails. The head is polar and hydrophilic, or water-loving. The tails are nonpolar and hydrophobic.

Mitochondria are called the powerhouse of a cell because they produce energy for the functioning of a cell. Energy is produced by the oxidation of food by the process of respiration.

Vinegar is a liquid that is produced from the fermentation of ethanol into acetic acid. Vinegar consists of acetic acid (CH₃COOH), water and trace amounts of other chemicals, which may include flavorings.

Boiling point of heavy water is higher than that of ordinary water.

Respiration is the process in which organisms exchange gases between their body cells and the environment. From prokaryotic bacteria and archaeans to eukaryotic protists, fungi, plants, and animals, all living organisms undergo respiration. 

Arboreal animals are creature who spend the majority of their lives in trees. They eat, sleep and play in the tree canopy. There are thousands of species that live in trees, including monkeys, koalas, possums, sloths, various rodents, parrots, chameleons, geckos, tree snakes and a variety of insects.

In input frequency of a full wave rectifier be n, then the output frequency would be 2n.

Advection is the transfer of heat or matter by the flow of a fluid, especially horizontally in the atmosphere or the sea.

The decibel (dB) is the unit used to measure the intensity of a sound or noise. It is a logarithmic expression of the ratio between two signal power, voltage, or current levels. Decibels (dB) are defined in terms of power per unit surface area on a scale from the threshold of human hearing, 0 dB, upward towards the threshold of pain, about 120-140 dB.

Bats are good at flying at night because they use sound rather than sight to navigate. Bats send pulses of sound through their mouths or noses, and these pulses echo back outlining the objects in the bats flight path. The ears of a bat are large and oddly constructed but they help it to determine where the echoes are coming from.

No change will happen.

Cartography, the art and science of graphically representing a geographical area, usually on a flat surface such as a map or chart. It may involve the superimposition of political, cultural, or other non geographical divisions for the representation of a geographical area.

A silver halide is one of the chemical compounds that can form between the element silver and one of the halogens. Silver halides are light-sensitive chemicals, and are commonly used in photographic film and paper.

An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel's octane rating by raising the temperature and pressure at which auto ignition occurs. The typical antiknock agents in use is Tetraelhyllead.

Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. 

The isotope used for the production of atomic energy is Uranium-235 (U-235). U-235 is an isotope of uranium making up about 0.72% of natural uranium. Uranium occurs in most rocks in concentrations of 2 to 4 parts per million and is as common in the Earth’s crust as tin, tungsten and molybdenum. Uranium occurs in seawater, and can be recovered from the oceans. It was discovered in 1935 by Arthur Jeffrey Dempster 

The equatorial bulge and the effects of the surface centrifugal force due to rotation results in lower acceleration due to gravity at Equator than that at the poles.

(d) A nucleon of an atom consists of either a proton or a neutron. Positrons are not present in a normal atom and are only produced during radioactive decay. 

Graphite is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. It occurs naturally in this form and is the most stable form of carbon under standard conditions. It is a native element mineral found in metamorphic and igneous rocks. It is used in the manufacture of lead pencil.

Angle of friction and angle of repose are equal to each other. Angle made by the resultant of normal reaction and limiting frictional force with the normal reaction is called angle of friction. The minimum angle of the plane at which the body kept on it starts to slide due to its own weight is called angle of repose.

If a patient receives a blood type that is incompatible, antibodies that the patient already has in his or her blood will attack the donor red blood cells and destroy them. This could cause fever, chills, chest or back pain, bleeding, increased heart rate, shortness of breath, rapid drop in blood pressure, and/or kidney damage.

Bullets fired from gun contain lead which when not removed from the body of an injured body may cause toxic effect.

Ringworm is a contagious fungal infection caused by mold-like parasites that live on the cells in the outer layer of your skin. It can be spread in the following ways: Human to human.

The pituitary gland is a part of endocrine system. Its main function is to secrete hormones into bloodstream. These hormones can affect other organs and glands, especially: thyroid. It is a protrusion off the bottom of the hypothalamus at the base of the brain. The pituitary gland is very important as it takes messages from the brain (via a gland called the hypothalamus) and uses these messages to produce hormones that affect many parts of the body, including stimulating all the other hormone-producing glands to produce their own hormones.