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The correct answer is Damodar Valley.

Key Points

• Gondwana-era coal makes up over 98% of all reserves in India, which is present in Damodar valley.
• It took around 250 million years for this coal to develop.
• When it comes to coal production and reserves, Jharkhand tops the list.
• Almost exactly along 24 degrees north latitude from the Gondwana era, a narrow strip containing the majority of Jharkhand's coal fields runs in an east-west orientation.
• Auranga, Bokaro, Dhanbad, Jharia, Giridh, Karanpur, Ramgarh, and Hutar are the state's primary coal mining hubs.

Additional Information

• ​India's primary energy source is coal.
• which accounts for over 67% of all commercial energy used in the nation.
• This fossil fuel also referred to as "Black Gold," is found in sedimentary strata.
• It is made of wood that contains biological material.
• The heat from below and pressure from above cause wood to burn and disintegrate when huge areas of forests are covered by sediments.
• It takes centuries for the phenomenon to produce coal.

According to given information:

Given Word : CASTRAPHONE

Forward pair : ST

Backward pair : NO, NT, OT, HE, PR

∴ Here, the number of pairs are '6'.

Hence, the correct answer is "6".

The correct answer is Satyendra Nath Bose.

Key Points

• Satyendra Nath Bose was awarded the Padma Vibhushan award C. Rajagopalachari, Sarvepalli Radhakrishnan and C. V. Raman were awarded the Bharat Ratna award.
• Satyanedranath Bose along with Meghnad Saha graduated from Presidency College Calcutta.
• Rabindranath Tagore dedicated his book on science, “Visva-Parichay”, to Satyendra Nath Bose in 1937.
• Satyanedranath Bose was honoured with the title Padma Vibhushan in 1954.
• Bose-Einstein condensate (BEC) is called the fifth state of matter named after him.
• It is formed when a gas of bosons having low densities is cooled to temperatures close to absolute zero.

Additional Information 

• Padma Vibhushan is the second-highest civilian award in India which is for those who are doing outstanding service without distinction of race, occupation and position.
• Bharat Ratna is the highest civilian award in India which is for those who are doing outstanding service without distinction of race, occupation and position.

Six friends, namely, A, B, C, D, E, F are sitting on a bench.

1) If C is sitting just left to A and A and B are sitting in the furthest corner.

2) E and F are sitting in the middle.

∴ Here, 'D' is sitting just to right of 'B'.

Hence, the correct answer is "D".

The correct answer is P.V. Sindhu.

Key Points

• The first Indian woman to win two Olympic medals was PV Sindhu.
• The great badminton player won a bronze medal at the Olympics in Tokyo after taking home a silver in the previous games in Rio.
• After defeating the world No. 9 in straight games, Sindhu earned bronze.
• In two games, 21-13 and 21-15, Sindhu prevailed in the match.
• The only other Indian with two Olympic medals is the wrestler Sushil Kumar.

Important Points

• The legendary shuttler currently holds the joint-most medals for a female singles player with seven from the World Championships and Olympics.
• Sindhu has two Olympic medals in addition to one gold, two silvers, and two bronzes from the World Championships.

Additional Information

• One of India's most accomplished sports person is P.V. Sindhu.
• At a number of competitions, including the Olympics and the BWF circuit, Sindhu has received medals.
• A gold medal from the 2019 World Championships is included in her list of medals.
• She is only the second individual athlete from India to win two straight medals at the Olympic Games.
• The first and only Indian to win the title of badminton world champion.
• In April 2017, she attained a career-high global ranking of no. 2.

The logic followed here is :-

1) Mohini is taller than Nita but not shorter than Sarita.

2) Sarita and Malini are of the same height and Mohini is shorter than Hema.

∴ Here, 'Mohini' is second tallest among them.

Hence, the correct answer is "Mohini".

Given:

Wheat : Paddy = 2 : 3

Family consumed = 5 : 4

Concept used:

Expenditure of commodity = Consumption of commodity × Rate of commodity

Calculation:

From the given data,

Expenditure of wheat = 2 × 5 = 10

Expenditure of paddy = 3 × 4 = 12

So,

Ratio of expenditure = Expenditure on wheat : Expenditure on paddy

Ratio of expenditure = 10 : 12 = 5 : 6

∴ The ratio of expenditure on wheat and paddy is 5 : 6.

The water image of the given figure is as shown below :

Detailed Explanation:

• The line BA is water image.
• The word "NUCLEAR" has first letters 'N'. So, the water image should be

⇒ Option 2 is eliminated.

• The word "NUCLEAR" has second letter "U". So, the water image should be

⇒ Option 1 is eliminated.

• The word "NUCLEAR" has fourth letter "L". So, the water image will be

⇒ Option 4 is eliminated.

Hence, the correct answer is "Option 3".

Given:

Father is three times as old as son

Calculation:

Let,

The age of son = x

The age of father = 3x

After 12 years,

The age of son = x + 12

The age of father = 3x + 12

From the given data we know that, father's age is twice as son after 12 years

Then,

⇒ 2 (x + 12) = 3x + 12 

⇒ 2x + 24 = 3x + 12

⇒ 24 - 12 = 3x - 2x

⇒ 12 = x

We know that, we have considered the age of son as x

⇒ Age of son = 12.

∴ The present age of son is 12 years.

The correct answer is Siraj Ud Daulla.

Key Points

• Calcutta was renamed Alinagar by Siraj-ud-Daulah.
• Robert Clive and Siraj-ud-Daulah signed the Treaty of Alinagar on February 9^th, 1757.
• The Nawab gave Calcutta the short-lived name of Alinagar after he had taken it over in the war.
• Although the Nawab had taken control of the English fort in Calcutta.
• He signed the pact in response to the English military might and the threat posed by Afghans in the back.

Additional Information

• Siraj-ud-Daulah or Siraj ud-Daula is another name for Mirza Muhammad Siraj-ud-Daulah.
• He was Bengal's final independent Nawab.
• The East India Company began to rule over Bengal at the end of his reign.
• Eventually nearly the entire Indian subcontinent went under British.