The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.

Correct Option: A

The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.

More than one option is correct. A light-year is a unit of length used informally to express astronomical distances. It is the distance that light can travel in one year which is approximately 9 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU),
a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Best Option: (4)

Correct Option: E

More than one option is correct. A light-year is a unit of length used informally to express astronomical distances. It is the distance that light can travel in one year which is approximately 9 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (IAU),
a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Best Option: (4)

Data for 2013 shows that renewable electricity generation overtook natural gas to become the second largest source of electricity worldwide producing 22% of total electricity or 5,130 TWh. Some of the sources of renewable energy are: solar power, wind power, wave and tidal power, geothermal power, biomass and hydro power. Fossil fuels remained the bedrock of global electricity production with more than two-thirds (about 67%) of the total.

Correct Option: C

Data for 2013 shows that renewable electricity generation overtook natural gas to become the second largest source of electricity worldwide producing 22% of total electricity or 5,130 TWh. Some of the sources of renewable energy are: solar power, wind power, wave and tidal power, geothermal power, biomass and hydro power. Fossil fuels remained the bedrock of global electricity production with more than two-thirds (about 67%) of the total.

Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pressure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78°C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.

Correct Option: A

Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pressure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78°C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.

Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.

Correct Option: B

Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.