FREE NEET Biology Practice MCQ Test: Environmental Issues Exercise 2 Questions Answers With Detailed Explanations [PDF]

Answer: (d)

Answer: (d)

The electrostatic precipitator can remove over 99 percent particulate matter present in the exhaust from a thermal power plant. The electrostatic precipitator has electrode wires which are maintained at several thousand of volts. The electrode wires produce a Corona that releases electrons. These electrons get attached to the dust particles by giving them a net-negative charge. The collecting plates are grounded to attract the charged dust –particles. The velocity of air between the plates is kept low enough to allow the dust particles to fall. However, the particulate matter that are very small are not removed by these precipitators.

Answer: (d)

Answer: (d)

The Kyoto Protocol is an international agreement linked to the United Nations Framework Convention on climate change which commits its parties by setting internationally binding emissions reduction targets. In Doha, Qatar on 8 December 2012, the “Doha Amendment to the Kyoto Protocol ” was adopted. The second commitment period was from 1st Jan. 2013 to $31^{st}$ Dec. 2020.

Answer: (b)

Answer: (b)

Jhum cultivation is a local name for slash and burn agriculture practised by the tribal groups in the northeastern states of India like Arunachal Pradesh, Meghalaya, Mizoram and Nagaland and also in the districts of Bangladesh like Khagrachari and Sylhet. This system involves clearing a piece of land by setting fire or clear felling and using the area for growing crops of agricultural importance such as upland rice, vegetables or fruits. After a few cycles, the land loses fertility and a new area is chosen.

Answer: (c)

Answer: (c)

Answer: (c)

Kyoto protocol is an international treaty to reduce emission of greenhouse gases which was adopted at the third session of the Conference of Parties (CoP - 3) to the UNFCCC (United Nations Framework Convention on Climate Change) in 1997, in Kyoto, Japan.

Answer: (d)

Answer: (d)

Answer: (d)

Answer: (c)

Answer: (d)

Noise level are expressed on a logarithmic scale of decibels. The baseline noise levels in the community vary around 40 dB. International standards prescribe a maximum of 50 dB for day and 40 dB for night time in a residential area. Noise over 115 dB is regarded as highly avoidable. The World Health Organization (WHO) recommends an industrial noise limit of 75 dB.

Answer: (b)

This statement is correct. Rest of the statements are incorrect and can be corrected as

• Catalytic converters have expensive metals like platinum, palladium and rhodium which act as catalysts.
• As the exhaust emission passes through the catalytic converter, nitric oxide is changed to nitrogen gas, carbon monoxide is oxidised to carbon dioxide and unburnt hydrocarbons get completely burnt into $CO_2$ and $H_2O$.
• Motor vehicles fit with catalytic converters should use unleaded petrol because the lead in petrol inactivates the catalyst.

Answer: (d)

Metals and minerals are both renewable and non-renewable resources. Non renewable due to very long recycling in case of metals and some minerals but renewable due to shorter recycling in case of biogenetic nutrients.

Answer: (a)

Answer: (b)

Answer: (d)

High amount of organic waste in a lake will trigger and activate decomposer microbes which will decompose organic waste. Biochemical Oxygen Demand (BOD) of this lake will shoot up and decomposers will utilise most of the dissolved oxygen present in lake. Consequently the level of dissolved oxygen will go down to alarming extent. Aquatic animals like fish which totally depend on the oxygen dissolved in water will ultimately die.

Answer: (b)