Answer: (A)
Explanation:
In 2005, 25143 Itokawa became the first asteroid from which samples were captured and brought to Earth for analysis. The Japanese spacecraft Hayabusa (Japanese for falcon) touched down twice on the asteroid and collected a small amount of dust despite the failure of the mechanism designed for the purpose. It delivered the sample to Earth on 13 June 2010.
In June 2018, the Japanese spacecraft Hayabusa2 arrived at the asteroid. After making measurements and taking samples, Hayabusa2 left Ryugu for Earth in November 2019 and returned the sample capsule to Earth on 5 December 2020. The samples showed the presence of organic compounds, such as uracil (one of the four components in RNA) and vitamin B3.
OSIRIS-REX mission launched in September 2016 and reached Bennu, a small, carbon rich asteroid discovered in 1999, in 2018. The spacecraft spent nearly two years orbiting the asteroid before venturing close enough to snatch a sample of the loose surface material with its robotic arm on October 20, 2020. The spacecraft departed Bennu in May 2021 for a 1.9 billion km cruise back to Earth, including two orbits around the sun. The Bennu sample has been estimated at 250 grams, far surpassing the 5 grams carried back from Ryugu in 2020 or the tiny specimen delivered from asteroid Itokawa in 2010.

Answer: (D)
Explanation:
Evidence from Indus Valley (Dock at Lothal), Mesopotamia and other coastal sites on the Arabian Sea show the existence of maritime trade networks circa 3300-1300 BCE.
Meanwhile, Neolithic-Chalcolithic sites in present-day Odisha (dated to as early as circa 2300 BCE) have yielded evidence of boat building and fishing, and, possibly, contact with South-East Asia.
Vedas (composed between circa 1500-500 BCE) feature colourful tales of seafaring and the perils involved.
The Buddhist fables Jataka Tales (composed circa 300 BCE- 400 CE) as well as Tamil Sangam literature (composed circa 300 BCE-300 CE) contain even clearer references to seas and seafaring.
Early maritime activity was largely restricted to the coasts. “Movement through the deep seas intensified by the 1st century BCE, with the emergence of the Roman Empire and its insatiable appetite for commodities from the East,”.
“In Roman sources, Muziris appears as the end of the world. But there is evidence to suggest a maritime route, probably hugging the coastline, all the way to China and Malaysia.
Towards the east, evidence of Indian artefacts have been unearthed as far away as Hepu in China, dating back to the 3rd century BCE. “The Hepu site is now recognised as the starting point of the Maritime Silk Road, which could have transported Chinese silk to Muziris for the Romans”. The port of Tamralipti (in present-day Bengal) is believed to be particularly important for this trade.
Source: https://indianexpress.com/article/explained/explained-history/indians-and-boats-in-deep-sea-history-8954997/

Answer: (C)
Explanation:
THE COUNTRY’S largest fuel retailer Indian Oil Corporation (IOC) on Monday started the operational trial of green hydrogen-fuelled buses in Delhi and the nearby areas of the National Capital Region (NCR).
Hydrogen produced by splitting water in an electrolyser powered by renewable energy is called green hydrogen, and it is considered totally clean as it has no carbon emissions in its entire value chain.
In a hydrogen-powered fuel cell automobile, hydrogen reacts with oxygen in the fuel cells, re- leasing electrical energy to power the automobile, and water as the byproduct.
Fuel cells are considered highly efficient as compared to the conventional internal combustion (IC) engines. The electrical efficiency of fuel cells is 55-60 per cent as compared to thermal efficiency of around 25 per cent for IC engines. Fuel cell vehicles are also considered superior to regular battery-powered electric vehicles.
“Fuel cells are highly efficient as compared to other mobility options. Fuel cells vehicles have inherent advantages of long range and lower refueling time as compared to battery vehicles,”.

Answer: (A)
Explanation:
Since the 1970s, there has been no change in the number of Lok Sabha seats. The Constitution (Forty-Second Amendment) Act, 1976 froze the delimitation of Lok Sabha constituencies as per the Census of 1971, up to the Census which was to be conducted in 2001. However, in 2001, the day of reckoning was pushed further to 2026. This was done through an amendment to Article 82 by the Constitution (Eighty-Fourth Amendment) Act. While the boundaries of electoral constituencies were redrawn in 2002, there was no change in the number of seats in the Lok Sabha. Only after 2026 will we consider changing the number of seats in the Lok Sabha. Strictly speaking, the relevant numbers as to population (and its distribution) are expected to come from the 2031 Census, which will be the first census after 2026.
Delimitation as of now: Article 81 of the Constitution says that each State gets seats in the Lok Sabha in proportion to its population. The freeze on delimitation effected in 1976 was to allay the concerns of States which took a lead in population control and which were faced with the prospect of reduction of their number of seats in the Lok Sabha.