Test : General Science - 8 - Defence MCQ

The skin is the largest organ of the body, with a total area of about 20 square feet. The skin protects us from microbes and the elements, helps regulate body temperature, and permits the sensations of touch, heat, and cold.

The disease is caused by the yellow fever virus and is spread by the bite of an infected female mosquito. It infects only humans, other primates, and several species of mosquitoes.

Nearsightedness, also known as myopia, is a common type of refractive error where close objects appear clearly, but distant objects appear blurry. 

Dr. N E Borlaug is father of Green Revolution.

The pH value of pure water is 7. Pure water is neutral by nature. The solution with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. 

Hydrogen gas is used in the manufacturing of Vanaspati ghee. To prepare the Vanaspati ghee, hydrogen gas is passed through vegetable oils under 8-10 atmospheric pressure in the presence of nickel powder at a temperature of 200°C, oil changes into vegetable ghee or solid fat known as Vanaspati ghee. 

Xenon is a chemical gas with symbol Xe and atomic number 54. It is a rare, odourless, colourless, tasteless, chemically unreactive gas. Xenon gas is also known as stranger gas as its volume is low in the atmosphere.

Universal Standard time, as originally proposed by Scottish-Canadian Sir Sandford Fleming in 1879, divided the world into twenty-four time zones, each one covering 15 degrees of longitude.

Kirchhoff's First Law states that the total current entering a junction is equal to the total current leaving the junction. In other words, the algebraic sum of currents at a junction is zero.

An anemometer is a device used for measuring the speed of wind.

Polio and pertusis are caused by virus. So, these can be controlled by vaccines.

Red Data Book is related with a complete list of all endangered species. 

Bat is mammal not a bird. 

An α-particle is identical with helium nuclei. It consists of 2 protons and 2 neutrons.

Rayon is made from naturally occurring cellulose. Rayon is also called artificial silk. 

Total internal reflection is responsible for mirage formation in deserts. 

Transformer is based on the principle of mutual induction. 

Curvature of the earth does not allow the television signals to be received beyond a particular distance. 

Velocity of raindrop increases until it reaches the terminal velocity.