Correct Answer: 18

Solution : In the below diagram, the shaded part represents the region that belongs to registers which are neither tools nor swords.

So, from the above, 18 registers are neither tools nor swords. Hence, the second option is correct.

Correct Answer: 1260

Solution : Given: $a=12, b=-7,$ and $c=-5$
$a^3= 12^3 = 1728$
$b^3=-7^3=-343$
$c^3=-5^3=-125$
$\therefore a^3+b^3+c^3=1728-343-125=1260$
Hence, the correct answer is 1260.

Correct Answer: 0.9

Solution : The value of $\sqrt{0.9}= \sqrt{\frac{9}{10}}$
= ${\frac{3}{\sqrt{10}}}$
= ${\frac{3\sqrt{10}}{10}}$
$\sqrt{10}$ is greater than 3 but less than 4.
So, 9 < 3$\sqrt{10}$ < 10
⇒ 0.9 < ${\frac{3\sqrt{10}}{10}}$ < 1
⇒ 0.9 < $\sqrt{0.9}$ < 1
Hence, the correct answer is 0.9.

Correct Answer: 260 cm²

Solution : Use the formulas:
Area of the slant surface = $\frac{1}{2}×p×l$
Perimeter, $p$ = $4a$
Slant height, $l$ = $\sqrt{(\frac{a}{2})^{2}+h^{2}}$
where $l$ = slant height, $h$ = height, $p$ = perimeter and $a$ = side of square base.
Diagonal of square base $= 10\sqrt2$

Correct Answer: QTRSX

Solution : Given:
FRIED is written as EQHDC.

Like, F – 1 = E; R – 1 = Q; I – 1 = H; E – 1 = D; D – 1 = C
The consistent difference between the letters of word and code is 1. 
Similarly,

Correct Answer: To be bitterly hostile towards each other.

Solution : The correct answer is the first option.

The idiom "at daggers drawn with" is an expression used to convey a state of intense hostility or bitter conflict between two parties. When people are "at daggers drawn with" each other,

Correct Answer: Did an unknown author write the book?

Solution : The correct choice is the fourth option.

Active voice emphasises the doer of the action, while passive voice emphasises the receiver. To convert passive voice to active, we make the subject perform the action and rephrase the verb.

The

Correct Answer: as well as

Solution : The correct choice is the third option.

To improve the sentence and make a comparison correctly, we compare the dancing ability of "he" with "Elena", using the correct comparative form as well as to indicate the comparison between the two individuals.

Therefore,

Correct Answer: Aniline

Solution : The correct option is Aniline.

To prepare benzene diazonium chloride, aniline (C₆H₅NH₂) is typically reacted with nitrous acid (HNO₂) at a low temperature of 273-278K. This reaction is known as the diazotization of aniline and is a

Correct Answer: Mango

Solution : The correct option is Mango.

The scientific name is Mangifera indica. The fruit is sweet and juicy. It is grown in the summer season. Mangoes are found in many varieties like Alphonso, Dasheri, Himsagar, Kesar, Chausa etc. Ripe mangoes or green mangoes are used