Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane. Its manufacture has been phased out under the Montreal Protocol.

Correct Option: A

Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane. Its manufacture has been phased out under the Montreal Protocol.

Acid rain is caused by emissions of Sulfur Dioxide (SO₂) and Nitrogen Oxide (NO_x), which react with the water molecules in the atmosphere to produce acids. Emissions of SO₂ and NO_x result from fossil fuel combustion. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and erosion of stone statues.

Correct Option: B

Acid rain is caused by emissions of Sulfur Dioxide (SO₂) and Nitrogen Oxide (NO_x), which react with the water molecules in the atmosphere to produce acids. Emissions of SO₂ and NO_x result from fossil fuel combustion. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and erosion of stone statues.

Nitrous oxide (N₂O) and methane (CH₄) are the two major greenhouse gasses (GHG) emitted by agricultural activities. N₂O accounts for around 8% of the warming impact of current human GHG emissions. Agricultural activities that directly increase N₂O emissions are: fertilization, application of manure or other organic materials, retention of crop residues, production of nitrogen-fixing crops and forages, and cultivation of soils with high organic matter content. Irrigation, drainage, tillage practices and fallowing of land also increase N₂O emission.

Correct Option: A

Nitrous oxide (N₂O) and methane (CH₄) are the two major greenhouse gasses (GHG) emitted by agricultural activities. N₂O accounts for around 8% of the warming impact of current human GHG emissions. Agricultural activities that directly increase N₂O emissions are: fertilization, application of manure or other organic materials, retention of crop residues, production of nitrogen-fixing crops and forages, and cultivation of soils with high organic matter content. Irrigation, drainage, tillage practices and fallowing of land also increase N₂O emission.

German Silver (also known as New Silver, Nickel Brass, etc) is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. It is named for its silvery appearance, but it contains no elemental silver unless plated.

Correct Option: C

German Silver (also known as New Silver, Nickel Brass, etc) is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. It is named for its silvery appearance, but it contains no elemental silver unless plated.

The ability of radioactivity to pass through materials is called its penetrating ability. Penetrating ability depends on the size of the radioactive particle. Alpha particles are the biggest, beta particles are very much smaller and gamma rays have no mass. Ultraviolet rays have less energetic photons compared to gamma rays and x-rays and a lower penetration power. Gamma rays are the most penetrating of the radiations.

Correct Option: D

The ability of radioactivity to pass through materials is called its penetrating ability. Penetrating ability depends on the size of the radioactive particle. Alpha particles are the biggest, beta particles are very much smaller and gamma rays have no mass. Ultraviolet rays have less energetic photons compared to gamma rays and x-rays and a lower penetration power. Gamma rays are the most penetrating of the radiations.