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The correct answer is Vitamin D.

Key Points

• Vitamin D, first identified as a vitamin early in the 20^th century, is now recognized as a prohormone.
• The scientific name for Vitamin D is calciferol.
• The two major forms are vitamin D2 and vitamin D3.
• Vitamin D2 (ergocalciferol) is largely human-made and added to foods.
• vitamin D3 (cholecalciferol) is synthesized in the skin of humans and is also consumed in the diet via the intake of animal-based foods.
• It is a fat-soluble vitamin that plays a crucial role in several important bodily functions.

Additional InformationVitamins, Their Chemical Names And Deficiency Disease.

Given that:

Five boys A, B, C, D and E are sitting in a circle facing the centre. E sits between A and D, A sits to the right of B

As per the information given

So B and D are sitting on both sides of C.

Hence the correct answer is Option 2: B and D

The Logic followed here is: Sum of the positional values of the opposite alphabet​ according to English Alphabet series.

O(15) → opposite alphabet is L and is coded as 12.

Similarly,

Hence the correct answer is Option 4: 81

The correct answer is Mercury.

Key Points

• Mercury is a chemical element; it has the symbol Hg and atomic number 80.
• It is also known as quicksilver and was formerly named hydrargyrum
• Mercury: Mercury is the only metal that is liquid at room temperature. Its melting point is -38.8°C, meaning it's even liquid well below freezing.
• The ore of mercury is cinnabar.
• Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices.

Additional Information

• Silver: Silver has a melting point of 961°C, which is well above room temperature (25°C).
• The most important ore mineral of silver is argentite (Ag2S, silver sulfide). Silver is commonly extracted from ore by smelting or chemical leaching.
• Sodium: Sodium has a melting point of 97.7°C, also significantly higher than room temperature.
• It occurs abundantly in nature in compounds, especially common salt—sodium chloride (NaCl)
• Gold: Gold has a melting point of 1064°C, making it a solid at room temperature.
• usually found in nature in a comparatively pure form.

According to the given information,

Here, we can see that the code for 'leaf' is 2, and the code for 'is' is 4.

Hence, the correct answer is "2 and 4".

The correct answer is Cuttack.

Key Points

• Subhas Chandra Bose was born to Bengali parents Prabhavati Bose (née Dutt) and Janakinath Bose on 23 January 1897 in Cuttack—in what is today the state of Odisha in India, but was then part of the Bengal Presidency in British India.
• Subhas Bose was born into wealth and privilege in a large Bengali family in Orissa during the British Raj.
• The early recipient of an Anglocentric education, he was sent after college to England to take the Indian Civil Service examination.
• He stood for unqualified swaraj (independence), and opposed the Motilal Nehru Report which spoke for dominion status for India.
• He actively participated in the Salt Satyagraha of 1930 and vehemently opposed the suspension of Civil Disobedience Movement and signing of the Gandhi-Irwin Pact in 1931.
• In the 1930s, he was closely associated with left politics in Congress along with Jawaharlal Nehru and M.N. Roy.
• Bose won the congress presidential elections at Haripura in 1938.
• Again in 1939 at Tripuri, he won the presidential elections against Gandhi's candidate Pattabhi Sitarammayya. Due to ideological differences with Gandhi, Bose resigned and left congress. Rajendra Prasad was appointed in his place.
• He founded a new party, 'the Forward Bloc'. The purpose was to consolidate the political left and major support base in his home state Bengal.

The correct answer is Namibia.

Key Points

• Recently Prime Minister, Shri Narendra Modi released wild Cheetahs which had become extinct in India - in Kuno National Park. Cheetahs brought from Namibia - are being introduced in India under Project Cheetah, which is the world's first inter-continental large wild carnivore translocation project. Out of the eight Cheetahs, there are five female and three male Cheetahs.
• The release of wild Cheetahs by the Prime Minister in Kuno National Park is part of his efforts to revitalise and diversify India’s wildlife and its habitat.
• The Cheetah was declared extinct from India in 1952. The Cheetahs that would be released are from Namibia and have been brought under an MoU signed earlier this year.
• The introduction of Cheetah in India is being done under Project Cheetah, the world’s first inter-continental large wild carnivore translocation project.

The pattern followed here is:

Hence the correct answer is Option 3: bbabaa

The correct answer is Air.

Key Points

• Loesses are homogeneous; porous; friable; pale yellow or buff; slightly coherent; typically, non-stratified; and often calcareous.
• Loess grains are angular, with little polishing or rounding, and composed of quartz, feldspar, mica, or other mineral crystals. Loesses have been described as rich, dust-like soil
• Loess deposits may become very thick: at more than a hundred meters in areas of Northwestern China and tens of meters in parts of the Midwestern United States.
• Loesses generally occur as blanket deposits that cover hundreds of square kilometres. The deposits are often tens of meters thick. Loesses often have steep or vertical faces
• In several areas of the world, loess ridges have formed that had been aligned with the prevailing winds during the last glacial maximum.
• These are called "paha ridges" in America and "greda ridges" in Europe. The formation of these loess dunes has been explained as a combination of wind and tundra conditions.

Given:

Average income of A and B is Rs.3300. The average income of B and C is Rs 3000 and the average income of A and C is Rs 2700.

Solution:

Sum of A and B Income = 3300 × 2 = 6600

Sum of B and C Income = 3000 × 2 = 6000

Sum of A and C Income = 2700 × 2 = 5400

⇒ 2(A + B + C) = 18000

⇒ A + B + C = 9000

Average of A, B and C = 9000/3 = 3000

The average income of these three people is Rs. 3000

∴ The average income of these three people is 3000.