Explanation

Familiar means واقفیت

The correct preposition after "familiar" when referring to a person is "to".

"Familiar to" means we recognize it or have seen it before.

Explanation

Crown Prince Mohammad bin Salman arrived in Pakistan on 17 February 2019 for a two-day official visit.

During the visit, investment agreements worth over $20 billion were signed between Saudi Arabia and Pakistan.

Explanation

The speed of sound depends on the medium's density and elasticity.

It travels fastest in solids (due to tightly packed molecules) and slowest in gases (like air).

Glass (Solid) – ~5,640 m/s

Water (Liquid) – ~1,480 m/s

Wood (Solid) – ~3,300–3,600 m/s

Air (Gas) – ~343 m/s

Explanation

 Sir Creek is a tidal estuary, not a glacier, sea, or Iceland

It's a 96 km (60 mi) long water body 

 It is located on the border between India and Pakistan.

It's known for its fluctuating tides and is part of the Indus River Delta, where it flows into the Arabian Sea.

Explanation

Given:

1. Ten years ago, C's mother was 4 times as old as C:

10 years ago, C = 15 → mother = 4×15 = 60 → Now = 70

After 10 years, mother = 80 → 2×25 = 50

Explanation

The Black Hole of Calcutta incident happened in 1756 when British prisoners were allegedly confined in a small room by the troops of Nawab Siraj-ud-Daula.

This event was one of the factors that led to the Battle of Plassey in 1757, where Siraj-ud-Daula was defeated by the British.

Explanation

The mistress enquired of Fanny if she had mailed the two letters she gave her the day before.

The reporting verb "enquired" changes the direct speech into indirect speech.

The past tense verb "gave" and the time word "yesterday" correctly change to "the day before" in indirect speech.

Explanation

According to the Economist Intelligence Unit's Democracy Index, Norway is considered the world's first democracy. 

The Economist Intelligence Unit has published a Democracy Index since 2006, and consistently ranks Norway at the top.

Explanation

Silicon is a metalloid with properties ideal for controlling electrical current.

It's the most widely used material in semiconductor devices like transistors and chips.

Explanation

The sentence is a hypothetical conditional (second conditional), which uses "were" for situations contrary to reality.

"If it were more humid in the deserts, the hot temperature would be unbearable" is grammatically correct in this context.