Correct Answer: Mercury

Solution : The correct answer is Mercury.

Mercury metal is an essential component of an amalgam. The atomic number of this element is 80. The symbol of Mercury is Hg, given after the Greek word hydor and argyros. Mercury serves as the liquid component that binds the other metals together to form a stable, durable filling material.

Correct Answer: To change the way one talks about something.

Solution : The correct option will be the first option.

The idiom to sing a different tune means to change one's attitude, opinion, or perspective on a particular matter. It is often used to describe someone who alters their stance or viewpoint, especially when they were previously expressing a different or opposing opinion.

Therefore, the correct meaning is to change the way one talks about something.

Correct Answer: 14

Solution : Given:
PINK is coded as 25, and HEAR is coded as 16. 

The sum of the positional values of the alphabet is divided by 2 to obtain the required code.
PINK→16 + 9 + 14 + 11 = 50; 50 ÷ 2 = 25
Thus, PINK is coded as 25.
HEAR→8 + 5 + 1 + 18 = 32; 32 ÷ 2 = 18
Thus, HEAR is coded as 18.
Similarly, follow the same pattern for FAIL→6 + 1 + 9 + 12 = 28; 28 ÷ 2 = 14

So, FAIL is coded as 14. Hence, the second option is correct.

Correct Answer: 112

Solution :  44 + 67 – 32 ÷ 4 + (9 + 5 + 5 + 4) – 4 × 12 ÷ 6 – 30 ÷ 5
= 111 – 8 + 23 – 4 × 2 – 6
= 111 + 15 – 8 – 6
= 112
Hence, the correct answer is 112.

Correct Answer: during

Solution : The correct choice will be the first option.

The word during is the correct preposition to use in this context. It indicates the time frame when fasting occurs, which is during some festivals.

Therefore, the sentence becomes grammatically correct and conveys the intended meaning with the use of during.

Correct Answer: Robert Hooke

Solution : The correct answer is Robert Hooke.

In 1665, the English scientist Robert Hooke is credited with being the first person to observe cells. He made this groundbreaking discovery while examining thin slices of cork under a microscope. Hooke's observations were documented in his book "Micrographia", where he coined the term "cell" to describe these basic structural units.

Correct Answer: Mahar

Solution : The correct option is Mahar.

Dr. B.R. Ambedkar, also known as Babasaheb Ambedkar, was associated with the Mahar community. He was a prominent leader, a social reformer, and the chief architect of the Indian Constitution. He played a crucial role in advocating for the rights and upliftment of marginalised communities, including the Dalits (formerly referred to as "untouchables"), to which the Mahar community belongs.

Correct Answer: Q

Solution : Given:
(I) Five people P, Q, T, V, and R are sitting in a circle facing away from the centre. P is to the immediate right of V.
(II) T is in between V and R.

According to the given information, the seating arrangement is as follows –

From the above seating arrangement, it is evident that Q is to the immediate left of R. Hence, the fourth option is correct.

Correct Answer: Nalanda University

Solution : The correct answer is Nalanda University.

In the ancient Indian kingdom of Magadha (modern-day Bihar), there stood a great Buddhist monastery known as Nalanda, a famous Mahavihara. The founder of the University of Nalanda was Kumaragupta I.

Correct Answer: 20 metres

Solution : Given: The perimeter of the top of a rectangular table is 56 metres and its area is 192 m².
Use the formulas,
Perimeter = $2(l+b)$
Area = $l\times b$
Length of diagonal = $\sqrt{l^2+b^2}$
Where $l$ and $b$ are length and breadth.
Here, $2(l+b)=56$
⇒ $(l+b)=28$
Also, $lb=192$.
We know the identity, $a^2+b^2=(a+b)^2-2ab$.
⇒ $l^2+b^2=(l+b)^2-2lb$
Substitute the values in the above equation,
⇒ $l^2+b^2=(28)^2–2\times 192$
⇒ $l^2+b^2=784–384=400$
The length of its diagonal = $\sqrt{l^2+b^2}$ = $\sqrt{400}$ = 20 m.
Hence, the correct answer is 20 metres.