Explanation

• The speed of sound is slower in denser media.
• Solids are denser than gases. However, they are also very rigid, and hence sound travels faster in solids.
• Stress on the fact that the speed of sound always depends on a combination of these two properties of any medium.

Explanation

21 binders bind 1400 books in 15 days, so 1 binder binds:

1400/21 = 66.67 books in 15 days

= 66.67/15 = 4.44 books per day

To bind 800 books in 20 days, we need:

800/20 = 40 books per day

Number of binders required = 40/4.44 = 9

So, 9 binders are required to bind 800 books in 20 days.

Explanation

The analogy is:

Pork : Pig :: Mutton : Sheep

Just as pork is the meat that comes from a pig.

Mutton is the meat that comes from a sheep.

Explanation

In MS Word, you can insert a chart by navigating to the "Insert" tab and selecting "Chart" from the options available.

Explanation

Khunjrab pass connects Pakistan with China.

Location: Hunza Pakistan - administered Gilgit–Baltistan and Xinjiang, China

Road name: N-35

Range: Karakoram

rk3-9-23

Explanation

حضور ﷺ نے غزوہ احد کے بعد تین دن تک "حمراۃ الاسد" میں قیام فرمایا۔

یہ قیام مشرکین کو دوبارہ مدینہ پر حملہ کرنے سے روکنے کے لیے تھا۔ 

Explanation

"Cattle" is a plural noun, so it doesn’t take an "s" or "is."

The correct form is "These cattle are mine."

Explanation

Instead of nostrils, insects breathe through openings in the thorax and abdomen called spiracles.

Insects that are diapausing or non-mobile have low metabolic rates and need to take in less oxygen.

Insects exchange oxygen and carbon dioxide through spiracles (noted by circle)

Explanation

The original statement is a direct quote, whereas the correct answer is a reported speech, which is a more polite and formal way of expressing the same sentence.

In reported speech, we change the sentence structure to:

"She asked him + question word + subject + verb"

So, the direct quote:

"Is it not your duty to help me in my old age?"

Becomes:

"She asked him if it was not his duty to help her in her old age."

Explanation

Email addresses cannot contain spaces, as they are not valid characters in email formatting.

Other characters like underscore (_) and at sign (@) are allowed. T

The at sign (@) is essential because it separates the username from the domain in an email address.