Correct Answer: Na₂B₄O_7.10H₂O

Solution : The correct answer is Na₂B₄O_7.10H₂O.

The chemical formula of Borax is Na₂B₄O₇·10H₂O. It consists of two sodium (Na) atoms, four boron

Correct Answer: 36

Solution : Given:
A batsman makes 81 runs in the 16th match and thus increases his average runs per match by 3.
Let his average for 15 innings be $x$.
So, the total number of runs in first 15 innings $= 15x$
According to the question,
$16×(x+3)-15x=81$

Correct Answer: 10th

Solution : The correct answer is 10th.

India's rank was 10th in the Asia Pacific personalized health index released by the Economic Intelligence Unit in January 2021. India has ranked 10th out of 11 Asia Pacific countries in the index. The 11 countries are India, Australia, China,

Correct Answer: Coconut 

Solution : The correct option is coconut.

Coconut cultivation is predominate in Kerala, earning the state the title of "The Land of Coconuts." Coconut farming is a vital aspect of Kerala's agriculture, and coconuts are utilised not just for their flesh and water, but also for a

Correct Answer: pair

Solution : The correct choice is the fourth option. 

Pair means two items that are matched or considered together. In the context of the sentence, it suggests that the speaker only ate a pair of apples, indicating two apples.

The meanings of the other options are

Correct Answer: interacting

Solution : The most appropriate choice is the fourth option.

It is the most appropriate choice because it implies engaging with friends and family in person and is relevant to the context of combating the negative effects of social media use by fostering real-world social connections.

Correct Answer: Siri

Solution : The correct option is Siri.

Siri was the capital of the Delhi Sultanate during the rule of Alauddin Khalji. It was established in 1303 A.D. and served as the centre of his administration. Siri played a key role in the administration and defence of the

Correct Answer: Biology

Solution : As per the given graph:
The difference in marks obtained in both the terms by the students in:
(i) English = 80 – 70 = 10 marks
(ii) Maths = 100 – 80 = 20 marks
(iii) Physics = 90 – 75 = 15 marks

Correct Answer: Periscope 

Solution : Given:
Star : Telescope :: Ship : ? 

A telescope is a device used to magnify and observe distant stars.
Similarly, a periscope is a device used on submarines and other vessels to view a ship on the water surface.

Hence, the first option is

Correct Answer: 48.07%

Solution : Imports in 1976 = 2700 (in thousand tonnes)
Imports in 1975 = 5200 (in thousand tonnes)
The decrease in imports in 1976 = 2500 (in thousand tonnes)
$\therefore$ The decrease percentage = $\frac{2500}{5200}\times{100}$ = 48.07%
Hence, the correct answer is 48.07%.