Test : General Science - 6 - NDA MCQ

The Surface tension of water provides the necessary wall tension for the formation of bubbles with soap water. The tendency to minimize that wall tension pulls the bubbles into spherical shape.

In absolute vacuum, there are no particles, no material medium, nothing. So, there is no reflection, refraction, diffraction, etc. That is why it travels the fastest in vacuum.

The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. Electric current is measured using a device called an ammeter.

If the force applied on the object is in the direction opposite to the direction of motion, the speed of the object decreases.

HF compounds has the strongest hydrogen bond.

The chief ozone-depleting substances include chlorofluorocarbons (CFCs), carbon tetrachloride, hydrochlorofluorocarbons (HCFCs) and methyl chloroform.

Georges Claude invented Neon Lamp.

Lichens are widely used as environmental indicators or bio-indicators. Because of their sensitivity lichens are particularly significant biological indicators of air pollution.

The study or science of mountains and their formation is called Orology.

Oxytocin is an hormone that is normally produced in the hypothalamus and stored in the posterior pituitary gland.

Optical fibre work on the principle of Total Internal Reflection of Light. In optical fibre, when light traveling in an optically dense medium hits a boundary at a steep angle (larger than the critical angle for the boundary), the light is completely reflected. This is called total internal reflection.

Water Tank appears shallower when viewed from the top due to refraction of light. This virtual depth is known as apparent depth.

Yellow colour is formed when Red and Green are mixed.

The SI unit of frequency is the hertz (Hz),  named after the German physicist Heinrich Hertz; one hertz means that an event repeats once per second.

RDX, the abbreviation of this word is Research Department Explosive, is also called cyclonite. It is powerful explosive discovered by Georg Friedrich Henning of Germany and patent in 1898 but not used until World War II when most of the warring powers introduced it. 

Silicon and germanium are frequently used for making transistors.

Brass gets discolored because of the presence of Hydrogen Sulphide in air.

Blue Whale is the largest known mammal

Ribo Nucleic Acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes.

The longest cells in the human body are nerve cells. The longest cells in the human body are the nerve cells whose cell bodies are located in the base of spinal cord and whose axons run down to the ends of toes.