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The correct answer is Methane.

Important Points

• Biogas is consists of Methane**, Hydrogen, Carbon dioxide.**
• Methane is the Main Constituent of Gobar gas or Biogas.
• Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste.
• When organic matter, such as food scraps and animal waste, breaks down in an anaerobic environment, they release a blend of gases, primarily methane and carbon dioxide.
• Because this decomposition happens in an anaerobic environment, the process of producing biogas is also known as anaerobic digestion.
• Anaerobic digestion is a natural form of waste-to-energy that uses the process of fermentation to breakdown organic matter.
• Animal manure, food scraps, wastewater, and sewage are all examples of organic matter that can produce biogas by anaerobic digestion.
• Due to the high content of Methane in biogas ( 50-75%), biogas is flammable, and therefore produces a deep blue flame, and can be used as an energy source.
• Biogas also called an environmentally friendly energy source.

The correct answer is Jawaharlal Nehru.

Key Points

• Letters from a Father to his Daughter is a collection of letters written by Jawaharlal Nehru to his daughter Indira Priyadarshini, originally published in 1929 by Allahabad law journal press at Nehru's request and consisting of only the 30 letters sent in the summer of 1928 when Indira was 10 years old.

 

Important Points

The correct answer is the Mediterranean Sea.

Important Points

• The Strait of Gibraltar is a narrow waterway separating the Atlantic Ocean (bottom left) from **the Mediterranean Sea (**top right).
• This 13-kilometer-wide waterway also separates Europe and Africa, with Spain and Gibraltar on the left and Morocco on the right.
• The Red Sea narrow strip of water extending southeastward from Suez, Egypt, for about 1,200 miles to the Bab-al-Mandeb Strait, which connects with the Gulf of Aden and thence with the Arabian Sea.
• The Atlantic Ocean, a body of Saltwater covering approximately one-fifth of the Earth's Surface and separating the continents of Europe and Africa to the east from those of North and South America to the West. It is the Second in Size to the Pacific Ocean.
• The Persian Gulf also called as Arabian Gulf, shallow marginal sea of the Indian Ocean that lies between the Arabian Peninsula and southwestern Iran.

The correct answer is France.

Hint

• FIFA stands for Federation Internationale de Football Association.
• The motto of FIFA is For the Game. For the World.
• France won the match after beating Croatia by 4-2 in Russia's FIFA world cup the Second time.
• FIFA is a non-profit organization that describes itself as an international governing body of association football and beach soccer.
• It is founded in 1904, Paris, France.
• It is the highest governing body of football.
• It is headquartered in Zurich, Switzerland.

Important Points

• FIFA WC 2022 Winner is Argentina, and it was held in Qatar.
• Argentina were crowned the champions after winning the final against the title holder France 4–2 on penalties following a 3–3 draw after extra time.

The correct answer is the State Bank of India.

Important Points

Given:

Father = 4 × daughter

Five years later

Father = 3 × daughter.

Calculation:

Let the present age of daughter be x years.

So, the father's present age is 4x years

After 5 years

⇒ 4x + 5 = 3 × (x + 5)

⇒ 4x + 5 = 3x + 15

⇒ x = 10

Present age of daughter is 10 years

Father's present age is 4 × 10 = 40 years

Ratio asked after 10 years

Age after 10 years will be 

⇒ Father : Daughter = 50 : 20

⇒ Father : Daughter = 5 : 2

∴ Father's age will be 2.5 times of daughter age after 10 years.

⇒ Father : Daughter = 4 : 1

⇒ (Father + 5)/(Daughter + 5) = 3/1

⇒ (4x + 5)/(x + 5) =  3/1

⇒ 4x + 5 = 3x + 15

⇒ x = 10

Father = 40 years and daughter = 10 years

Ratio after 10 years will be

⇒ 50 : 20 = 5 : 2

∴ Father's age will be 2.5 times of daughter age after 10 years.

Shortcut Trick

In the given ratio we need to make the difference of ratio equal

After equating difference between the father's age is equal to given years

 so 1unit = 5 years

In the question asked 5 years more later so wee add 1 unit into the ratio

Final ratio we will get Father : Daughter = 10 : 4

∴ Father's age will be 2.5 times of daughter age after 10 years.

Given:

Product of digits of a two-digit number is 8

Adding 18 reverse the number

Calculation:

Let digit on number be a and b

So, the number is a × 10 + b

According to question

⇒ a × 10 + b + 18 = b × 10 + a

⇒ 10a – a + b – 10b = 18

⇒ 9a – 9b =18 

⇒ a – b = 2

Now we look at the factors of 8 with a difference of 2

⇒ 4 × 2 = 8

So, a = 2 and b = 

number will be 2 × 10 + 4 = 24

∴ The number is 24

Shortcut Trick

Concept used:

By reversing a two-digit number the difference between the number and reversed number is multiple of 9 and difference of two-digit.

⇒ 9 × 2 = 18

So, the difference of two-digit of the number is 2

Now, check for the factors of 8 with the difference of 2

⇒ 4 × 2 = 8

So, the digits of the number will be 2 and 4

∴ The number is 24.

Important Points

There are two combinations of 2 and 4. 24 and 42 but in the question given that by adding 18 number the number reversed.

So, the number has to be 24.

Given:

0.002 × 0.5

Calculation:

⇒ (2/1000) × (5/10)

⇒ (10/10000)

⇒ (1/1000) = 0.001

∴ The value of 0.002 × 0.5 is 0.001.

Given:

 52% of X : 30% of Y is 12 : 5

X - Y = 50

Calculation:

First, we have to find X and Y

⇒ (52%X)/(30%Y) = 12/5

⇒ X/Y = (12 × 30)/(5 × 52)

⇒ X/Y = 360/260

⇒ X/Y = 18/13

Now, X - Y = 50

⇒ 18a - 13a = 50

⇒ 5a = 50

⇒ a = 10

 So, X = 180 and Y = 130

⇒ 2X + Y

⇒ 2 × 180 + 130

⇒ 490

∴ Value of 2X + Y is 490.

Given:

Amit is 6 years older than Soma.

Bunny's age is 1/3^rd of Soma's age.

Sum of the present age of Amit and Bunny is 54 years.

Calculation:

Let the present age of Soma be x years

Let the age of Amit and Bunny be A and B respectively.

So, A = x + 6

B = x/3

A + B = 54

⇒ x + 6 + x/3 = 54

⇒ 4x/3 = 54 - 6

⇒ x = 48 × (3/4)

⇒ x = 36 years

Soma's present age is 36 years

Bunny's present age is 12 years.

Soma's age when Bunny was born = 36 - 12

⇒ 24 years

∴ Age of Soma when Bunny was born was 24 years