Revision Series | Science | General Science | 48

Answer- B

• In winter the air can become loaded with the products of incomplete combustion such as (PM), (VOCs), (CO), nitrogen oxides (NOx) and hydrocarbons.
• The severity of the resulting winter smog depends on the degree of atmospheric dispersion. The lower the level of atmospheric dispersion, the higher the level of winter smog. Hence option B is correct.

Answer- c

Answer- c

• Two main organs in the human body where the magnetic field gets produced are the heart and the brain.
• The magnetic field inside the body forms the basis of obtaining the images of different body parts.
• This is done using a technique called Magnetic Resonance Imaging (MRI).
• Analysis of these images helps in medical diagnosis. Magnetism has, thus also got an important application in medicine.

Answer- c

• The autotrophs capture the energy present in sunlight and convert it into chemical energy which remains stored in the form of Carbohydrates.
• The flow of energy is unidirectional. The energy that is captured by the autotrophs does not revert back to the solar input and the energy, Which passes to the herbivores does not come back to autotrophs.
• As it moves progressively through the various trophic levels it is no longer available to the previous level.
• The green plants in a terrestrial ecosystem capture about 1% of the energy of sunlight that falls on their leaves, rest gets dissipated.

Answer- c

Answer- c

Answer- D

EnergyconsumedQ=timetakent×powerconsumed=0.04kW×6hr=2.4kWh.
For 30 days, the energy consumed is given as 2.4kWh×30=7.2kWh.
Hence, the total energy consumed for 30 days is kWh.

Answer- c

Answer- D

Answer- D