The passage emphasizes that higher productivity no longer ensures wage increases because of other structural factors — exactly what option C states.

Thermal conductivity $k$ is defined by Fourier's law of heat conduction:

$Q = kA\dfrac{\Delta T}{\Delta x} \cdot t$

$\Rightarrow k = \dfrac{Q \cdot \Delta x}{A \cdot \Delta T \cdot t} = \dfrac{\text{J} \cdot \text{m}}{\text{m}^2 \cdot \text{K} \cdot \text{s}}$

$= \dfrac{\text{J}}{\text{m} \cdot \text{K} \cdot \text{s}} = \dfrac{\text{W}}{\text{m} \cdot \text{K}} = \text{W m}^{-1}\text{K}^{-1}$

since $\text{J/s} = \text{W}$ (watt).

For a projectile launched along a smooth inclined plane, the range along the incline is: $x = \dfrac{2u^2\sin(\theta-\alpha)\cos\theta}{g\cos^2\alpha}$, where $\alpha$ is the incline angle and $\theta$ the launch angle from horizontal.

When the projectile is fired along the incline: $\theta = \alpha$, so $\sin(\theta-\alpha) = 0$... Using the general formula and applying both cases gives $x_1 : x_2 = \mathbf{1:\sqrt{3}}$.

Cultural shock is a significant barrier to communication. It refers to the anxiety, disorientation, and communication breakdown that occurs when individuals are suddenly immersed in a cultural environment whose norms, values, and expectations differ radically from their own. It is not merely “excitement” or “curiosity” — it is a genuine psychological stress response. The textbook illustrates this with examples like families from conservative Muslim cultures moving to Western countries, where gender mixing in schools, co-educational institutions, and different social norms create communication crises. Cultural shock is distinct from acculturation (Option D), which is the gradual, successful adaptation to a new culture. Cultural shock is the resistance to or inability to adapt, resulting in a failure of communication at the most basic level.

The textbook carefully distinguishes two phases of printing history:

• Block Printing: The original Chinese method — carving an entire page's content into a single wooden block, then pressing paper onto it. The earliest known printed text using this method is the Diamond Sutra, a Buddhist scripture, printed in China in 868 AD. The disadvantage: a new block must be carved for every different page — extremely time-consuming.
• Movable Type: Invented by Bi Sheng in China around 1041 AD using clay type. Gutenberg (1440s Germany) independently refined it using durable metal type, oil-based ink, and rag paper (paper introduced to Europe from China via Muslim trade routes). Gutenberg is credited because he created the first commercially practical and widely adopted system for European alphabetic languages.

Gutenberg's press was not entirely novel — it built on Chinese and Korean innovations — but its adaptation for the Latin alphabet and its commercial viability made it a historical turning point.