UPSC Current Affairs Quiz : 26 February 2024

Solution: d)

Natural sources (volcanoes, fires, phytoplankton) produce sulphur dioxide, but burning sulphur-rich fossil fuels—primarily coal, oil, and petroleum—is the main source of the gas. Smelter ovens, which are used to concentrate metals found in ore, also produce it.

Solution: b)

Statement 1 is incorrect.

A heat dome occurs when an area of high-pressure traps warm air over a region, just like a lid on a pot, for an extended period of time. The longer that air remains trapped, the more the sun works to heat the air, producing warmer conditions with every passing day. Heat domes generally stay for a few days but sometimes they can extend up to weeks, which might cause deadly heat waves.

Scientists suggest that any region of high pressure, whether a heat dome or not, forces air to sink and once it reaches the ground, it gets compressed and becomes even warmer. Moreover, when air sinks, it gets drier and further raises the temperature of the area.

The heat dome’s formation is related to the behaviour of the jet stream — an area of fast-moving air high in the atmosphere. The jet stream is believed to have a wave-like pattern that keeps moving from north to south and then north again. When these waves get bigger and elongated, they move slowly and sometimes can become stationary. This is when a high-pressure system gets stuck and leads to the occurrence of a heat dome.

Although heat domes are likely to have always existed, researchers say that climate change may be making them more intense and longer. They suggest with the rising temperatures, it is expected that the jet stream will become more wavy and will have larger deviations, causing more frequent extreme heat events.

Solution: b)

Statement 2 is incorrect.

Compressed natural gas, or CNG, is natural gas under pressure which remains clear, odourless, and non-corrosive – and can be used as a cheaper, greener, and more efficient alternative to the traditional petrol and diesel fuels for vehicles.

CNG is comprised mostly of methane gas which, like gasoline, produces engine power when mixed with air and fed into your engine’s combustion chamber.

CNG engines run more quietly due to the higher-octane rating of CNG over gasoline and they produce less exhaust emissions. Harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2) and nitrous oxide (N2O) can be reduced by as much as 95% when compared to gasoline powered vehicles.

Solution: c)

The Constitution (First Amendment) Bill sought to make several consequential changes — from exempting land reforms from scrutiny to providing protections for backward classes in the Constitution. Notably, it also expanded on the scope of the restrictions on the right to free speech.

Solution: c)

What was the Ulgulan movement?

The Ulgulan movement of 1899 also involved the use of weapons and guerrilla warfare to drive out foreigners. Munda encouraged the tribals to refuse following colonial laws and paying rent. He encouraged changes in the social sphere too, challenging religious practices to fight against superstition, and became known as ‘Bhagwan’ (God) and ‘Dharati Aba’ (Father of the earth) by his followers.

But the British were soon able to halt the movement. On March 3, 1900, Munda was arrested by the British police while he was sleeping with his tribal guerilla army at Jamkopai forest in Chakradharpur.