FIA ASI Paper 15-12-2021

The boundary between the Earth's mantle and core, known as the core-mantle boundary or the Gutenberg discontinuity, lies at approximately 2,900 to 3,000 kilometers depth. Therefore, option D (3000 kilometers) is correct.

The National Anthem of Pakistan was first played publicly on 13th August 1954, making option A correct. This date is historically significant as it marked the anthem's debut before Pakistan's Independence Day on 14th August.

The Dasht-e-Lut desert is located in Iran. It is one of the hottest and driest places on Earth, known for its unique geological features.

Neon gas is most commonly used in neon signs because it emits a distinct bright red-orange light when an electric current passes through it, making it ideal for colorful lighting displays.

Pedology is the scientific study of soils, including their formation, classification, and mapping. Therefore, the correct answer is 'Soils'.

Saturn is famously known for its prominent and beautiful ring system, which is the most extensive and visible among the planets in our solar system. Jupiter and Uranus also have rings, but they are faint and less noticeable.

The welcome screen in most operating systems displays the names of all user accounts available on the computer, allowing users to select their profile to log in. This matches option B, making it the correct answer.

The correct HTML tag to underline text is <u>. Since none of the given options (B, C, D) represent the <u> tag, the correct answer is 'None of these'.

The antonym of 'drought' (a prolonged period of dryness) is 'surplus', which implies an excess or abundance, often of water or resources. The other options do not represent opposites of drought.

There are exactly 6 Surahs in the Quran named after Prophets: Surah Muhammad(PBUH), Surah Yunus, Surah Hud, Surah Yusuf, Surah Ibrahim and Surah Nuh.