Correct Answer: 14.625

Solution : Time taken by Jason alone to complete the work = 23.4 days
⇒ Part of work done by Jason alone in a day = $\frac{1}{23.4}$ = $\frac{10}{234}$
Time taken by Rafique alone to complete the work = 39 days
⇒ Part of work done by Rafique alone in a day = $\frac{1}{39}$
Let the time taken by Jason and Rafique together to complete the work = $x$ days
⇒ Part of work done by Jason and Rafique in a day = $\frac{1}{x}$
According to the question,
$\frac{10}{234}$ + $\frac{1}{39}$ = $\frac{1}{x}$
$\Rightarrow \frac{1}{x}$ = $\frac{10+6}{234}$= $\frac{8}{117}$
$\Rightarrow x$ = $\frac{117}{8}$ = 14.625
Hence, the correct answer is 14.625.

Correct Answer: Mercury

Solution : The correct answer is Mercury.

Biomagnification is the process of accumulation of toxic substances in the body of an organism and it passes and amplifies in the subsequent trophic levels or in a food chain. For an element to biomagnify it has to be fat soluble and it should be long lived. Biomagnification is usually seen in DDT and in metals like Mercury. Mercury pollution causes Minamata disease. 

Correct Answer: INR 2,688 gain

Solution : Cost price = INR 48,000
Selling price after 12% loss = $\frac{48000\times (100-12)}{100}$ = INR 42,240
Selling price after 20% gain = $\frac{42240\times (100+20)}{100}$ = INR 50,688
Profit = Selling price – Cost price = INR (50,688 – 48,000) = INR 2,688
Hence, the correct answer is a profit of INR 2,688.

Correct Answer:

Solution : According to the given figures –
1. The first triangle is changing position in a clockwise direction.
2. The second triangle is changing position in an anti-clockwise direction.
3. The third triangle is changing its position at 180º.
So, following the above pattern, the required figure will be as follows –

Hence, the third option is correct.

Correct Answer: Dhrupad

Solution : The correct answer is Dhrupad.

Asgari Bai was a notable Indian Dhrupad singer recognised for her significant contributions to classical music. Throughout her career, Asgari Bai received several honours, including the Padma Shri, Tansen Samman, Academy Samman and Shikhar Samman, highlighting her excellence in the field of Dhrupad singing. Her life and achievements are explored in the Indian documentary film "Asgari Bai" (1998), directed by Priti Chandriani and Brahmanand S. Singh.

Correct Answer: RBI

Solution : The correct option is RBI.

The term Lender of Last Resort describes the function of a central bank, such as the Reserve Bank of India (RBI), which offers financial support to commercial banks or other financial institutions experiencing financial crises or liquidity shortages, particularly during periods of economic stress.

Correct Answer: Punjab

Solution : The correct answer is Punjab.

In 1848, Dalhousie unveiled a plan dubbed the "Doctrine of Lapse". If a king did not have a natural successor, the British would take control of the kingdom under this policy. It prohibits the adoption of sons. The Doctrine of Lapse was not strictly applied in the annexation of Punjab. Instead, a treaty was negotiated, and the region was annexed to the British East India Company after the Second Anglo-Sikh War in 1849.

Correct Answer: BABC

Solution : Given:
A_CCD_BCCDA_CCDABC_D

To fill the series we have to divide the series – A_CCD /_BCCD / A_CCD / ABC_D
Let's check each option –
First option: CACB; ACCCD / ABCCD / ACCCD / ABCBD (No repeated pattern has been found.)
Second option: DACB; ADCCD / ABCCD / ACCCD / ABCBD (No repeated pattern has been found.)
Third option: BABC; ABCCD / ABCCD / ABCCD / ABCCD (ABCCD is repeated in the series.)
Fourth option: BBBB; ABCCD / BBCCD / ABCCD / ABCBD (No repeated pattern has been found.)

So, the series becomes→ABCCDABCCDABCCDABCCD. Hence, the third option is correct.

Correct Answer: Rs. 3,745.92

Solution : Given: Simple interest on amount $P$ after 10 years = 40% of $P$
Term for Simple Interest, $n_1$ = 10 years
Sum for compound interest, $P$ = Rs. 30,000
Term for compound interest, $n_2$ = 3 years
Simple interest after $n_1$ years = $\frac{P{n}_{1}R}{100}$
40% of $P=\frac{P\times 10\times R}{100}$
⇒ $R$ = 4%
So, Rate, $R$, for compound interest = 4%
When compounded annually, compound interest after $n_2$ years = $P[(1+\frac{R}{100}{)}^{n_2}-1]$
= $30000[(1+\frac{4}{100}{)}^3–1]$
= Rs. 3,745.92
Hence, the correct answer is Rs. 3,745.92.

Correct Answer: (3)

Solution : The sentence can be improved using the third option.

"Everyone" is a pronoun that means a group of people and is used to refer to a collective group which makes it a better choice for the sentence and helps in conveying the intended message of the sentence.

Therefore, the correct sentence is: The President shook hands with everyone on the dais.