A white elephant is a well-known idiom for a possession that is expensive to maintain but of little practical use or value. The origin traces to the tradition of rare white elephants being gifted to disfavored courtiers in Southeast Asia — the recipient could neither refuse nor afford the upkeep. The phrase now means any burdensome, costly, and useless thing.

Correct Answer: B — useless and costly.

Management has become increasingly complex and demanding for all four reasons: foreign competition, new technology, expanding scientific information, and rapid change. This complexity leads organizations to ask HR managers for assistance in strategic decisions.

The orbit radius is $r = R + 2R = 3R$.

Orbital KE: $KE = \frac{GmM}{2r} = \frac{GmM}{6R}$

Total mechanical energy in orbit: $E_{orbit} = -\frac{GmM}{2r} = -\frac{GmM}{6R}$

Energy on surface: $E_{surface} = -\frac{GmM}{R}$

Minimum energy required:

$\Delta E = E_{orbit} - E_{surface} = -\frac{GmM}{6R} + \frac{GmM}{R} = \frac{GmM}{R}\left(1 - \frac{1}{6}\right) = \frac{5GmM}{6R}$

• $NH_{4}NO_{2} \xrightarrow{\Delta} N_{2} + 2H_{2}O$
• $Ba(N_{3})_{2} \xrightarrow{\Delta} Ba + 3N_{2}$
• $(NH_{4})_{2}Cr_{2}O_{7} \xrightarrow{\Delta} N_{2} + Cr_{2}O_{3} + 4H_{2}O$
• $(NH_{4})_{2}SO_{4}$ decomposes to release $NH_{3}$ (Ammonia) gas, not $N_{2}$.

Spearman’s two-factor theory (1904) proposed that intelligence comprises a general factor (g), common to all cognitive tasks, and specific factors (s), unique to each particular task. This was one of the first systematic, statistically-derived theories of intelligence.

Correct Answer: A — Spearman’s two-factor theory.