Correct Answer: INR 1,400

Solution : Given: Salaries of B, C, D, and E are in the ratio of 2 : 3 : 4 : 5 respectively.
Percentage increase = 20%, 30%, 40%, and 50%.
Let the salary of B, C, D, and E be $2x, 3x, 4x,$ and $5x$, respectively.
According to the question,
$4x+0.4(4x)=560$
⇒ $4x+1.6x=560$
⇒ $5.6x=560$
⇒ $x=100$
The sum of the original salaries of B, C, D, and E
$=2x+3x+4x+5x=14x=14\times100=$ INR 1,400
Hence, the correct answer is INR 1,400.

Correct Answer: Rhodophyceae

Solution : The correct answer is Rhodophyceae.

The Rhodophyceae division is the taxonomic classification for these red algae. They are distinguished by their reddish or purple hue, attributed to pigments like phycoerythrin and phycocyanin. These algae play a crucial role in marine ecosystems and have applications in various industries, including food and cosmetics.

Correct Answer: 71

Solution : Let's check the options –
First option: 42; 42 is divisible by 1, 2, 3, 6, 7, 14, 21, 42. It is not a prime number.
Second option: 84; 84 is divisible by 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84. It is not a prime number.
Third option: 91; 91 is divisible by 1, 7, 13, 91. It is not a prime number.
Fourth option: 71; 71 is divisible by only 1 and 71. It is a prime number. 

The fourth option does not follow a similar pattern as the other options. Hence, the fourth option is correct.

Correct Answer: 1-b, 2-a, 3-d, 4-c

Solution : The correct answer is 1-b, 2-a, 3-d, 4-c.

The sex ratio is a demographic metric that shows the number of females per thousand male population. It is an important indicator which shows the status of gender equality and women empowerment in the region. As per the census 2011, Kerala has the highest sex ratio, with 1084 females per thousand males. Puducherry has a sex ratio of 1037, Delhi has 879, and Haryana has the lowest sex ratio with only 868 females per thousand males.

Correct Answer: Hockey

Solution : The answer is Hockey.

Rollin is a term associated with hockey, and it refers to the return of the ball to play after it has crossed the touchline. Major Dhyan Chand was one of the greatest hockey players, not only in India but in the world. The highest sports award in India is also named after Major Dhyan Chand.

Correct Answer: Poison

Solution : The correct option is - Poison

The Latin word "virus," which means poison and other hazardous compounds, is where the word "virus" originates. The minuscule infectious agent known as a virus is able to multiply itself inside the living cells of other organisms. Being parasites, viruses rely on the host organism for food and energy.

Correct Answer: 1954

Solution : The correct answer is 1954.

Linus Carl Pauling received the Nobel Prize in Chemistry in 1954 for his pioneering work on the nature of chemical bonds and their application to unravel the structures of complicated molecules. In the mid-twentieth century, Linus Pauling's research considerably enhanced the science of chemistry by offering deep insights into the fundamental forces that keep atoms and molecules together.

Correct Answer: 172

Solution : Given:
43, 172, 86, 344, ?

In the given series, multiply by 4 and divide by 2 alternately to get the missing number.

So, 172 is the missing number in the given series. Hence, the first option is correct.

Correct Answer: Governor

Solution : The Correct Answer is-  Governor

The Governor appoints the District Judges after consulting with the High Courts.  According to Article 233, district judges are appointed. Any state's governor appoints district judges after consulting with the high court. The district's top judge is known as a district judge. He serves as the session judge as well.

Correct Answer: recession

Solution : The correct choice is the fourth option.

A recession is a significant decline in economic activity, often characterised by a decrease in GDP, rising unemployment, and reduced consumer spending. In the context of the sentence, it's referring to a period of economic downturn.

The meanings of the other options are as follows:

• Recission: This is not a standard English word.

• Revision: A revision is a change or correction made to something, such as a document or plan, often to improve or update it.

• Remission: Remission typically refers to the temporary or permanent decrease or disappearance of the symptoms of a disease.

Therefore, the complete sentence would be: "Hundreds of firms went bankrupt during the recession."