LNAT Science & Technology Practice Questions | Free Section A Drill

Why science & technology passages come up so often

The LNAT isn't testing your scientific knowledge — it's testing whether you can follow a passage built around data and technical detail, spot what a finding actually supports versus what it's being stretched to imply, and evaluate an expert's claim on its own terms. Science and technology topics suit this well because they combine hard figures with genuine open questions, which is exactly the structure LNAT questions probe. You do not need any specialist background to do well here; everything you need is in the passage.

Sample Passage

Science & Technology · Original practice passage · ~400 words

The Duration Problem

Britain's grid-scale battery storage capacity has grown rapidly in recent years. The growth reflects a straightforward problem: as wind and solar generation have grown to supply a larger share of Britain's electricity, the gap between when renewable power is generated and when it is needed has widened, and batteries are one of the few technologies that can close that gap on a timescale of minutes rather than months.

Lithium-ion batteries, the same chemistry used in electric vehicles, account for the great majority of installed grid batteries. Their principal advantage is speed: a lithium-ion battery farm can begin discharging power into the grid within a second of being called upon, making it well suited to smoothing short-term fluctuations in wind output. Their principal limitation is duration. Most grid-scale lithium-ion installations are designed to discharge fully within one to four hours, which addresses hourly volatility but does little to cover the lulls in wind generation that can last several days.

This mismatch between the storage the grid has and the storage the grid needs has prompted growing interest in alternative technologies. Long-duration systems — including compressed air, liquid air, and flow batteries — can discharge over periods of eight hours or longer, but remain considerably more expensive per unit of stored energy and have been deployed at only a fraction of the scale of lithium-ion. A parallel development has been the rise of "second-life" battery storage, in which batteries retired from electric vehicles, having degraded below the threshold acceptable for automotive use, are repurposed for stationary grid storage, where slower charge-discharge cycles place less demand on ageing cells.

Some energy analysts argue that relying on a single battery chemistry is a structural weakness rather than a temporary phase. Lithium-ion, on this view, is excellent at the job it was designed for, which is short-duration response. Treating it as the default answer to every storage problem the grid has is a mistake: long wind lulls are not a rare edge case, and the economics of lithium-ion get considerably worse the longer a battery must hold its charge.

Whether long-duration alternatives can scale quickly enough to matter is, at present, an open question. Costs for several competing technologies are falling, but from a much smaller base than lithium-ion enjoyed a decade ago, and grid operators must commit to infrastructure now for a demand profile that will only fully materialise once renewable generation expands further still.

Questions

1According to the passage, the main limitation of lithium-ion grid batteries is that they:

respond too slowly to sudden changes in wind output.
are usually designed to discharge fully within a few hours, which does little to cover wind lulls lasting several days.
wear out too quickly to be reused once they are retired from electric vehicles.
cost more per unit of stored energy than long-duration alternatives.

Correct: (b). The second paragraph names duration as the "principal limitation": most installations discharge within one to four hours, which "does little" to cover lulls lasting several days. (a) reverses the passage: speed is lithium-ion's "principal advantage". (c) contradicts the third paragraph, where retired vehicle batteries are reused for grid storage. (d) swaps the two technologies round: the passage says it is the long-duration systems that are more expensive per unit of stored energy.

2Which of the following, if true, would most strengthen the view that relying on lithium-ion is "a structural weakness rather than a temporary phase"?

Lithium-ion batteries can respond to changes in demand even faster than was previously measured.
Lulls in wind generation lasting several days have become much less common.
Even as both technologies get cheaper, lithium-ion is expected to remain far more expensive than long-duration systems for storing energy over several days.
Batteries reused from electric vehicles perform well in stationary grid storage.

Correct: (c). The view you are asked to strengthen is that the problem will not simply fix itself. If lithium-ion stays much more expensive for multi-day storage even as costs fall, then its limitation is built in, not a phase it will grow out of. (a) is about speed, which nobody disputes is a strength. (b) would weaken the view, because long lulls are the problem lithium-ion cannot cover. (d) is about second-life batteries, which are still lithium-ion, so it says nothing about whether depending on that one chemistry is a weakness.

3Which of the following can most reliably be inferred from the final paragraph?

Grid operators must make investment decisions before it is clear which long-duration technologies will become affordable at scale.
Long-duration storage will become cheaper than lithium-ion within the next decade.
Grid operators have stopped investing in lithium-ion batteries.
Renewable generation in Britain has stopped growing.

Correct: (a). The final paragraph says it is "an open question" whether alternatives can scale in time, and that operators "must commit to infrastructure now" for demand that will only fully arrive later. Put together, that is (a). (b) makes a prediction the passage refuses to make. (c) goes beyond the passage, which never says investment in lithium-ion has stopped. (d) contradicts the passage, which expects renewable generation to expand "further still".

4The tone of the final paragraph is best described as:

confident that long-duration storage will soon replace lithium-ion.
dismissive of long-duration technologies as too expensive to matter.
alarmed, predicting that the grid will soon fail.
cautious, noting some progress while treating the question as unresolved.

Correct: (d). The paragraph calls the question "open", notes that costs "are falling" but "from a much smaller base", and describes the timing problem operators face. That mix of progress and uncertainty is cautious. (a) and (b) each take a side the paragraph avoids taking. (c) exaggerates: the paragraph describes a planning difficulty, not an imminent failure.

Tips for science & technology passages

Separate what the evidence shows from what someone argues it means. Science passages often report a trend and then give an interpretation of it. Questions frequently test whether you can tell the two apart.
Keep track of trade-offs. When a passage sets one technology's advantage against its limitation, wrong answers often swap them round.
Notice how certain the author is. Phrases like "an open question" and "at present" tell you the author is not making a prediction, so answers that predict the future are usually wrong.
Don't bring in outside knowledge. Every answer comes from the text alone. What you have read about energy elsewhere can mislead you here.

Frequently Asked Questions

Why do science and technology passages appear on the LNAT?

The LNAT tests whether you can follow a data-led or technical argument and evaluate the strength of its evidence, not whether you have scientific knowledge. Technology and energy topics are a natural source of this kind of reasoning because they combine hard data with genuine uncertainty about what that data implies.

Do I need a science background to answer these questions correctly?

No. The LNAT does not test specialist scientific or technical knowledge. Every question can be answered using only the information and figures given in the passage itself.

How is this different from a full LNAT practice test?

This page isolates one passage subject so you can drill a specific weak spot quickly. Lexcello's full practice tests combine 12 passages across all subjects, timed exactly as the real 95-minute LNAT Section A.

LNAT Science & Technology Practice