Correct Answer: (4)

Solution : The correct choice is the fourth option.

There is no improvement required in the sentence. The original sentence is grammatically correct and effectively conveys the intended meaning.

To refrain from is the appropriate way to express the doctor's advice for the person to avoid

Correct Answer: Museology

Solution : The correct answer is Museology.

The science of preservation of historical articles is known as museology. Iconography is the study of visual images and symbols; numismatics is the study of coins and currencies; epigraphy is the study of inscriptions and epigraphs.

Correct Answer: –3

Solution : Given: $x^{3}+y^{3}+z^{3}=13$, $ x+y+z=1$, $xyz=1$
We know, $x^{3}+y^{3}+z^{3}-3xyz= (x^{2}+y^{2}+z^{2}-xy-yz-zx)$
$⇒x^{3}+y^{3}+z^{3}-3xyz= (x+y+z)((x+y+z)^{2}-3(xy+yz+zx))$
Substituting values of $x^{3}+y^{3}+z^{3}$, $ x+y+z$ and $xyz$,
$⇒13-3(1)=(1)((1^{2}-3(xy+yz+zx))$
$⇒xy+yz+zx=\frac{10-1}{-3}$
$\therefore xy+yz+zx=-3$
Hence, the correct answer is –3.

Correct Answer: (19, 391)

Solution : Let's check the options –
First option: (11, 121)→(11)² = 121
Second option: (13, 169)→(13)² = 169
Third option: (19, 391)→(19)² = 361 ≠ 391
Fourth option: (21, 441)→(21)² = 441

The third option does not follow a similar pattern

Correct Answer:

Solution : The correct answer is Magma.

Magma is an extremely hot liquid or semi-liquid rock found beneath the Earth's surface. Hot molten rocks generated within the ground are sometimes forced out through breaks on the earth's surface such as craters in the form of volcanic eruption.
 

Additional

Correct Answer: Lord Ripon

Solution : The correct answer is Lord Ripon.

As Viceroy, Lord Ripon enacted numerous changes to improve the lot of the native Indian population. The first of these reforms was the establishment of the local self-government, which was unique to British India. He is referred to

Correct Answer: It becomes easily and quickly achievable.

Solution : The right option is the first option.

The idiom "bob's your uncle" means "there you go" or "there you have it." It is used to indicate that a particular solution, action, or procedure is simple or easy to accomplish,

Correct Answer: have been told

Solution : The most appropriate option to fill in the blank is the third option.

This construction is in the present perfect tense, which is appropriate for actions that started in the past and continue into the present. The phrase have been told is the

Correct Answer: 2

Solution : The phrase "three hours ago and have been waiting" is incomplete without the word "ever" between "since" and "then" to form "ever since." This phrase is used to indicate that the waiting has been continuous from that time onward.

Therefore, the corrected sentence is, "We

Correct Answer: 7

Solution : 7 + 30 ÷ 6 – (6 + 6) + 7
= 7 + 5 –12 + 7
= 19 – 12
= 7
Hence, the correct answer is 7.