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14 Sep 2022, 02:29
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Difficulty:
5%
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Question Stats:
86% (01:27) correct
14%
(01:45)
wrong
based on 259
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The new aluminium alloy is thirty percent lighter than the aluminium alloy used in the car manufacturing industry. Using the new alloy, it will be possible to reduce much of the weight of the car. Cars thus built will be light enough to allow the engine to accelerate from zero to a hundred miles per hour in merely five seconds, a drop of three seconds from the time currently taken by cars. However, the maximum speed at which these new cars would be recommended to drive would be 120 miles per hour, thirty miles less than the limit for current cars.
Which one of the following, if true, best explains why the new cars have lower maximum speed limit despite their higher accelerations?
(A) Aluminium alloys are not strong enough to withstand high speed winds.
(B) Current aluminium alloy cars use anti-braking systems for safe driving at high speeds.
(C) Government standards do not allow high speed rating to be given to new car designs.
(D) The lighter the car, the more difficult it is to control above a certain speed.
(E) The new light-weight cars are more acceptable for city driving than for highway driving.
Which one of the following, if true, best explains why the new cars have lower maximum speed limit despite their higher accelerations?
(A) Aluminium alloys are not strong enough to withstand high speed winds.
(B) Current aluminium alloy cars use anti-braking systems for safe driving at high speeds.
(C) Government standards do not allow high speed rating to be given to new car designs.
(D) The lighter the car, the more difficult it is to control above a certain speed.
(E) The new light-weight cars are more acceptable for city driving than for highway driving.
14 Sep 2022, 04:08
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My Breakdown:
Find the best explanation why the new cars have lower maximum speed limit
(A) Aluminium alloys are not strong enough to withstand high speed winds.That does not explain the difference between the current and new aluminium alloys. Many assumptions are needed to verify the difference in strength of both. Hence not a very convincing way to explain the main paradox
(B) Current aluminium alloy cars use anti-braking systems for safe driving at high speeds. It is not stated that the new cars will not use anti-braking. We could also say that we don't know the relation of anti-braking with speed limit (what speeds are deemed as high speeds?). Already two assumptions(and maybe more) required to give it any credit. Hence unable to explain the main paradox efficiently
(C) Government standards do not allow high speed rating to be given to new car designs. Ok, but does that mean we need to reduce the speed limit. Too many assumptions required to connect Govt. standards and speed limit. Hence unable to explain the main paradox efficiently
(D) The lighter the car, the more difficult it is to control above a certain speed. So if I assume the speed after which the lighter car goes out of control is 120, then this statement makes a whole lot of sense. So 1 assumption required.
(E) The new light-weight cars are more acceptable for city driving than for highway driving. Where is the relation between speed limit. Also acceptable in what way? (could be due to its size or weight or pollution, who knows)? Hence unable to explain the main paradox efficiently
According to me, answer should be D.
- The new aluminium alloy is thirty percent lighter than the aluminium alloy used in the car manufacturing industry.
New alloy lighter than current - Using the new alloy, it will be possible to reduce much of the weight of the car.
Hence car made of new alloy lighter - Cars thus built will be light enough to allow the engine to accelerate from zero to a hundred miles per hour in merely five seconds, a drop of three seconds from the time currently taken by cars.
Lighter car accelerate faster - However, the maximum speed at which these new cars would be recommended to drive would be 120 miles per hour, thirty miles less than the limit for current cars.
Author recommends lighter car speed limit to be lower than current car. ➡️Ask 'why' to get the answer
Find the best explanation why the new cars have lower maximum speed limit
(A) Aluminium alloys are not strong enough to withstand high speed winds.That does not explain the difference between the current and new aluminium alloys. Many assumptions are needed to verify the difference in strength of both. Hence not a very convincing way to explain the main paradox
(B) Current aluminium alloy cars use anti-braking systems for safe driving at high speeds. It is not stated that the new cars will not use anti-braking. We could also say that we don't know the relation of anti-braking with speed limit (what speeds are deemed as high speeds?). Already two assumptions(and maybe more) required to give it any credit. Hence unable to explain the main paradox efficiently
(C) Government standards do not allow high speed rating to be given to new car designs. Ok, but does that mean we need to reduce the speed limit. Too many assumptions required to connect Govt. standards and speed limit. Hence unable to explain the main paradox efficiently
(D) The lighter the car, the more difficult it is to control above a certain speed. So if I assume the speed after which the lighter car goes out of control is 120, then this statement makes a whole lot of sense. So 1 assumption required.
(E) The new light-weight cars are more acceptable for city driving than for highway driving. Where is the relation between speed limit. Also acceptable in what way? (could be due to its size or weight or pollution, who knows)? Hence unable to explain the main paradox efficiently
According to me, answer should be D.
14 Sep 2022, 20:52
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Bunuel
Conclusion: Cars made up of new aluminium- Easy to accelerate but difficult to control above a certain speed limit.
(A) Aluminium alloys are not strong enough to withstand high speed winds: If we replace
(B) Current aluminium alloy cars use anti-braking systems for safe driving at high speeds: Irrelevant. Reject
(C) Government standards do not allow high speed rating to be given to new car designs: This could have been possible. But do we know how much is this speed rating? The high-speed rating could have been more than the current limit. Reject
(D) The lighter the car, the more difficult it is to control above a certain speed: with new aluminium, cars will weigh less. Hence difficult to control after a certain speed. This unambiguously supports the conclusion. Correct
(E) The new light-weight cars are more acceptable for city driving than for highway driving: Irrelevant. Reject
Answer is D
