Correct Answer : A1689 B11
Scientists have discovered the most ancient spiral galaxy in the universe that existed 11 billion years ago and could provide insights into the early cosmos. The galaxy, known as A1689B11, existed just 2.6 billion years after the Big Bang, when the universe was only one fifth of its present age.
Correct Answer : CFC
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). ... CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
Correct Answer : Water
Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature. ... The decay of organic matter in water is measured as biochemical or chemical oxygen demand.
Correct Answer : Technetium
Technetium. The first element that was synthesised, rather than being discovered in nature, was technetium in 1937. This discovery filled a gap in the periodic table, and the fact that no stable isotopes of technetium exist explains its natural absence on Earth (and the gap).
Correct Answer : Light energy into electrical energy
Correct Answer : 8.5
Correct Answer : Mercury
Correct Answer : Cinnabar
Correct Answer : Methane
CNG is the compressed form of Natural Gas, which is mainly composed of methane [CH₄]), which is less than 1% of the volume it occupies at standard atmospheric pressure so that large volume of gas can be stored in CNG cylinder.
Correct Answer : Earthworm
Earthworms are called as nature's ploughman because they loosen the soil when they burrow and this is good for the soil because it lets the CO2 out and the O2 in. It also helps to mix the nutrients in the soil, making it better for plants to grow.
