Daily Quiz: UPSC Prelims Marathon – June 28, 2018

Carbon dioxide extinguishers work because carbon dioxide molecules are heavier than oxygen molecules. When the liquid carbon dioxide inside the extinguisher expands into a gas, the carbon dioxide pushes out any oxygen surrounding the fire. Without oxygen available to fuel the chemical reaction, the fire goes out quickly. This property can also make them dangerous in confined spaces since the carbon dioxide also pushes out any oxygen that the user needs to breathe.

Sound waves in other terms to be called as mechanical a wave which compulsorily requires a medium for its propagation. Whereas, Electromagnetic waves doesn‘t depends with the medium, which can even travel in the vacuum.

Asupermoon is the coincidence of a full moon or a new moon with the closest Asupermoon is the coincidence of a full moon or a new moon with the closest approach that the Moon makes with the Earth on its elliptical orbit. If a supermoon falls on a full moon day then it results in the largest apparent size of the lunar disk for an observer on the Earth. The technical name is the perigee-syzygy of the Earth–Moon–Sun system. Occasionally, the supermoon coincides with the total lunar eclipse.

Dark matter is a hypothetical material that an astronomer or scientist cannot observe through ordinary telescopes. Although dark matter has not been directly observed, its existence and properties are inferred from its gravitational effects such as the motions of visible matter. The name refers to the fact that it does not emit or interact with electromagnetic radiation, such as light, and is thus invisible to the entire electromagnetic spectrum. It is considered to be responsible for holding all the normal matter in the universe together. These dark matter particles have to be quite massive to form the observed structures, about as heavy as the heaviest particles we know already. If dark matter particles weren‘t heavy enough they wouldn‘t clump sufficiently, which is why they are called WIMPs for ―Weakly Interacting Massive Particles. And we know that neutrinos, even though weakly interacting, can‘t make up dark matter because they are too light and they wouldn‘t clump strongly enough to seed galaxy filaments.

The old 2001 policy mandated that  ISRO could release only data upto 5.8 meter resolution.

4K TV is an Ultra high definition television. UHDTV, has horizontal  resolution on the order of 4,000 pixels. Since its screen is too big the HD gives blurred images.

New Super Wi-Fi will support 802.11 ad standard, it can send data upto the length of 1-2 GB and would function at the speed of 7 gigabits per second.