Reading Practice Test 3: True/False/Not Given Mastery

Read the text below and answer questions 1-12.

The Psychology of Decision-Making

Human decision-making is far less rational than most people assume. Research in behavioural psychology and economics has revealed that individuals consistently rely on mental shortcuts, known as heuristics, that can lead to systematic errors in judgment. Understanding these cognitive biases is essential not only for academic study but also for practical applications in fields such as marketing, public policy, and personal finance.

One of the most well-documented biases is the anchoring effect. When people are asked to estimate an unknown quantity, their estimates are heavily influenced by any number they have been recently exposed to, even if that number is completely irrelevant. In one classic experiment, participants were asked to spin a roulette wheel and then estimate the percentage of African countries in the United Nations. Those who spun a higher number on the wheel consistently gave higher estimates, despite the obvious irrelevance of the roulette result. This effect has been replicated in numerous contexts, including real estate pricing, salary negotiations, and courtroom sentencing.

Another significant bias is loss aversion, identified by researchers Daniel Kahneman and Amos Tversky. Their work demonstrated that people feel the pain of losing something approximately twice as intensely as they feel the pleasure of gaining something of equal value. This asymmetry explains why investors often hold onto declining stocks far too long, hoping to avoid realising a loss, while selling winning stocks too quickly to lock in gains. Loss aversion also influences consumer behaviour, as people are more motivated by the fear of missing a limited-time offer than by the appeal of a standard discount.

The availability heuristic is a third important bias. People tend to judge the probability of events based on how easily examples come to mind. Because dramatic events such as plane crashes receive extensive media coverage, many people overestimate the risk of air travel while underestimating far more common dangers such as car accidents. Similarly, after seeing news reports about shark attacks, swimmers may overestimate the likelihood of being attacked, even though the statistical risk is extremely low.

Awareness of these biases does not automatically eliminate them. However, researchers have found that structured decision-making frameworks, such as checklists and pre-commitment strategies, can help individuals and organisations reduce the influence of cognitive biases on important decisions. Education about these biases is increasingly being incorporated into professional training programmes in medicine, law, and business.

Read the text below and answer questions 13-24.

Renewable Energy Storage

The transition to renewable energy sources such as solar and wind power is widely regarded as essential for addressing climate change. However, one of the most significant obstacles to this transition is the intermittent nature of these energy sources. The sun does not always shine, and the wind does not always blow, creating periods when energy generation falls short of demand. Effective energy storage solutions are therefore critical to ensuring a reliable supply of renewable electricity.

Lithium-ion batteries are currently the most widely deployed energy storage technology. Originally developed for portable electronics, these batteries have been scaled up for use in electric vehicles and grid-scale storage systems. Their energy density, which refers to the amount of energy that can be stored per unit of weight or volume, is among the highest of any commercially available battery technology. However, lithium-ion batteries have notable drawbacks, including limited lifespan, the use of materials such as cobalt that are associated with environmentally destructive mining practices, and the risk of thermal runaway, a condition in which the battery overheats and may catch fire.

Pumped hydroelectric storage is another established technology. This approach involves pumping water uphill to a reservoir when excess energy is available and then releasing it through turbines to generate electricity when demand increases. Pumped hydro accounts for over ninety percent of global grid-scale energy storage capacity. Its main limitation is geographic: it requires suitable terrain with significant elevation differences, which restricts where such facilities can be built.

Emerging technologies offer potential alternatives. Flow batteries, which store energy in liquid electrolytes held in external tanks, can be scaled up simply by increasing the size of the tanks, making them suitable for large-scale applications. Hydrogen storage, in which excess renewable electricity is used to produce hydrogen through electrolysis, is another promising approach. The hydrogen can later be converted back to electricity using fuel cells or burned directly for heat. However, the efficiency of the hydrogen production and conversion cycle remains relatively low, with significant energy losses at each stage.

Researchers are also investigating compressed air energy storage and gravity-based systems, though these remain largely in the experimental phase. The consensus among energy experts is that no single technology will dominate the future of energy storage. Instead, a diverse portfolio of storage solutions, each suited to different applications and scales, will be needed to support a fully renewable energy grid.

Read the text below and answer questions 25-36.

Ancient Roman Engineering

The engineering achievements of ancient Rome remain among the most impressive in human history. Roman engineers developed construction techniques and infrastructure that not only served the immediate needs of a vast empire but also laid the groundwork for modern civil engineering. Many Roman structures have survived for over two thousand years, a testament to the quality of their design and materials.

The Roman road network is perhaps the most famous example of Roman engineering. At its peak, the network extended over 400,000 kilometres, connecting the provinces of the empire from Britain to North Africa and the Middle East. Roman roads were built using a layered construction method. The base consisted of large stones, followed by layers of gravel and sand, topped with flat paving stones. This multi-layered approach provided excellent drainage and durability, and many sections of Roman roads remain visible today.

Roman aqueducts are another remarkable achievement. These structures transported fresh water from mountain sources to cities, sometimes over distances exceeding 100 kilometres. The aqueducts relied on a gentle and consistent downward gradient, typically a drop of about one metre for every 200 metres of horizontal distance, to maintain water flow using gravity alone. The visible arched bridges that many people associate with Roman aqueducts actually represent only a small portion of the total system; the majority of the water channel ran underground or at ground level.

Concrete was a material innovation that transformed Roman construction. Roman concrete, made from a mixture of volcanic ash, lime, and seawater, proved remarkably durable. Modern analysis has revealed that the chemical reaction between volcanic ash and seawater actually strengthened the concrete over time, as mineral crystals grew within the material. This contrasts sharply with modern Portland cement concrete, which tends to degrade over decades when exposed to seawater.

The Pantheon in Rome, completed around 125 CE, exemplifies the sophistication of Roman engineering. Its dome, spanning 43.3 metres, remained the largest unreinforced concrete dome in the world for nearly 1,900 years. The dome's design incorporates a series of recessed panels called coffers that reduce its weight without compromising structural integrity. At the centre of the dome is an oculus, an open circular skylight 8.7 metres in diameter, which is the building's sole source of natural light.