FIA

The sequence consists of perfect squares of prime numbers: 2²=4, 3²=9, 5²=25, 7²=49, 11²=121, 13²=169, 17²=289, 19²=361. The missing numbers correspond to 7²=49 and 23²=529. Since 529 is not among the options, the first missing number is 49, which is option A.

The Heavy Mechanical Complex (HMC) in Taxila, Pakistan, was established under the 3rd Five Year Plan with technical and financial cooperation from the government of the People's Republic of China. It started operations in 1971 and was supported by China in its initial setup and subsequent expansions. This is confirmed by official government sources and the HMC's own historical records. Therefore, the correct answer is China (option A), not the UK.

One hectare is exactly equal to 2.47 acres, which is a standard unit conversion in land measurement.

A 'Blue chip' stock refers to shares of well-established, financially sound companies with a long-standing record of reliable earnings and often regular dividend payments. These stocks are considered low-risk investments due to their stability, strong market position, and consistent performance. The term originates from poker, where blue chips have the highest value. Blue chip stocks are highly sought after and typically included in major stock market indices like the Dow Jones Industrial Average or the S&P 500.

Depreciation is the accounting term for the fall in the value of an asset over time due to wear and tear, usage, or obsolescence. It is a systematic, non-cash allocation of the cost of a tangible fixed asset over its useful life, reflecting the asset's gradual loss in value. This matches the expense with the revenue generated by the asset and provides tax benefits. Therefore, option C, 'Depreciation,' is the correct answer.

The sentence implies that his knowledge was insufficient for the job. 'Inadequate' precisely means not enough or insufficient, making it the best choice. 'Incomplete' suggests missing parts but doesn't directly imply insufficiency, and 'Ineffectual' means ineffective, which is less appropriate here. 'All of the above' is incorrect because not all options fit well.

The opposite of 'hostile' is 'friendly' because 'hostile' means unfriendly or antagonistic, while 'friendly' means kind and supportive, making option B the correct antonym.

The term "Air-Head" is a colloquial expression used to describe a person who is perceived as silly or lacking intelligence, which aligns with option A. The other options do not match the common meaning of the term.

The sequence given is 4, 18, 3, 21, 7, 56, ?. From the search results and reasoning, a plausible pattern is that the middle number between two numbers is the product of the first and third numbers in that triplet. For example, 4 × 3 = 12 (not matching 18), but the search result suggests a similar pattern with a slightly different sequence (6, 18, 3, 21, 7, 56) where 6 × 3 = 18 and 3 × 7 = 21, and 7 × 8 = 56, so the next number is 8. Applying this logic to the original sequence, the next number after 56 would be 8 to maintain a similar multiplicative pattern. Therefore, option A (8) is the correct answer. The original explanation was unclear and the subject was incorrect; the subject is corrected to Mathematics.

In early Islam, the zakat on trade wealth was established at a rate of 2.5% (one quarter of one tenth, or one-fortieth). This rate was codified in the second year after the Hijrah when detailed zakat regulations were established. For an investment of 200 dirhems, the zakat due would be 2.5% of 200, which equals 5 dirhems. Therefore, the correct answer is option C (5 dirhems).