SSC CGL Previous Year Questions: General Science - 2 - SSC CGL MCQ

The nephron is the microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman's capsule.

The SI unit of audio frequency is the hertz (Hz). It is the property of sound that most determines pitch. The generally accepted standard range of audible frequencies for humans is 20 to 20,000 Hz. The range of frequencies individuals hear is greatly influenced by environmental factors.

Shadows are made by blocking light. Light rays travel from a source in straight lines. If an opaque (solid) object gets in the way, it stops light rays from traveling through it.

Producer gas is the product obtained when coal or coke is burnt with air deficiency and with a controlled amount of moisture. Producer gas is a gas mixture containing carbon monoxide hydrogen, carbon dioxide and nitrogen.

A hygrometer is an instrument used to measure the amount of humidity and water vapour in the atmosphere, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity.

Infrasound is sound below the level of human hearing. The frequency of a sound is measured in Hertz (Hz) and the infrasonic range is generally considered to be between 1 and 20 Hz.

Electromagnetic waves are formed when an electric field comes in contact with a magnetic field. They are hence known as 'electromagnetic' waves. The EM waves travel with a constant velocity of 3.00 x 108 ms-1 in vacuum. They are deflected neither by the electric field, nor by the magnetic field. An electromagnetic wave can travel through anything - be it air, a solid material or vacuum

Ecology is a branch of biology that studies the interactions among organisms and their biophysical environment, which includes both biotic and abiotic components. Topics of interest include the biodiversity, distribution, biomass, and populations of organisms, as well as cooperation and competition within and between species.

Gills take oxygen out of the water and let water carry away carbon dioxide. Fish force water through their gills, where it flows past lots of tiny blood vessels. Oxygen seeps through the walls of those vessels into the blood, and carbon dioxide seeps out

Urochrome is a yellow pigment that comes from the processing of dead blood cells in the liver. The remaining bilirubin is extracted by the kidneys, where converted it gives urine that familiar yellow color. So Urochrome and the degradation products of bilirubin and urobilin, make urine yellow.

Tomato, wheat, grass are few examples of herbs

Lizards, snakes, crocodiles and tortoises belong to the reptile group.

Tensiometers are devices that measure soil moisture tension (soil matric water potential)

The SI unit of force is the newton (symbol N).

Glass, asbestos, wood, cork, cotton wool and air are some examples of Bad conductor.

Rusting of iron is an example of a Redox reaction.

• Redox reaction = Oxidation-Reduction reaction. In this reaction, an oxidation number of a molecule, atom, or ion changes either by gaining or losing an electron. 
• The substance which gets reduced in a chemical reaction is known as the oxidizing agent and a substance that gets oxidized in a chemical reaction is known as the reducing agent.
• Rusting is the corrosion of iron. Iron forms red-brown hydrated metal oxide (rust) in the presence of water and air. 
• Iron is oxidized to Fe2+ and oxygen is reduced to water. Rust keeps on forming due to the subsequent oxidation of Fe²⁺ by atmospheric oxygen.
• Therefore we can say that rusting is a redox reaction because oxygen acts as an oxidising agent and iron acts as a reducing agent.

A Cation is an ion or group of ions possessing a positive charge and having the natural ability to move toward
the negative electrode in electrolysis. Sulphate ion doesn't in this group.

The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate). Chlorine oxide is not a component of Smog.

An axillary bud is a sprout that develops in the axil of a plant, which is the angle formed by the upper side of the stem and an outgrowing leaf or branch.

The basic function of xylem is to transport water from roots to shoots and leaves, but it also transports some nutrients.

Whittaker proposed an elaborate five kingdom classification - Monera, Protista, Fungi, Plantae and Animalia.

Newton's first law of motion: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is also called Galileo's law of falling bodies.

Pyrometers

The correct answer is Pyrometer. Pyrometers are the temperature measuring devices used to detect the object's temperature and electromagnetic radiation emitted from the object.

The acid produced by ant's bite is called formic acid.

Solid sol is a type of colloid. Examples of Solid sol are Pumice stone, Foam rubber etc.

Itai-Itai disease was caused by cadmium in the sea area of japan.

Cows are known as "ruminants" because the largest pouch of the stomach is called the rumen

Red blood cells (Hemoglobin) transports oxygen to all the parts of the body and ultimately to all the cells.

The primary function of the kidney is to remove nitrogenous wastes (mainly urea) from the body.

Light does travel around corners a little. This effect is called diffraction.