LSAT 120 – Section 3 – Question 01

LSAT 120 - Section 3 - Question 01

October 2005

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT120 S3 Q01
+LR
Most strongly supported +MSS
Net Effect +NetEff
A
3%
157
B
1%
154
C
1%
150
D
0%
153
E
95%
163
126
135
144
 +Easier 146.629 +SubsectionMedium

Although fiber-optic telephone cable is more expensive to manufacture than copper telephone cable, a telephone network using fiber-optic cable is less expensive overall than a telephone network using copper cable. This is because copper cable requires frequent amplification of complex electrical signals to carry them for long distances, whereas the pulses of light that are transmitted along fiber-optic cable can travel much farther before amplification is needed.

Summary
Fiber-optic telephone cables are more expensive to make than copper cable. Networks using fiber-optic cables are less expensive overall than copper. This is because copper cables require frequent amplification of electrical signals to travel long distances, whereas fiber-optic cables use light pulses that travel farther before requiring amplification.

Strongly Supported Conclusions
Savings from switching to fiber-optic cables from copper cables exceeds the greater manufacturing cost.

A
The material from which fiber-optic cable is manufactured is more expensive than the copper from which copper cable is made.
This is unsupported because while we know it is more expensive to manufacture fiber-optic cable, we don’t know if this is directly due to the price of materials or some other part of the manufacturing process.
B
The increase in the number of transmissions of complex signals through telephone cables is straining those telephone networks that still use copper cable.
This is unsupported because while we know that it is more expensive to send signals long distance with copper, we don’t know that it necessarily puts more strain on the networks.
C
Fiber-optic cable can carry many more signals simultaneously than copper cable can.
This is unsupported because we are not told anything about the quantity of signals that each type of cable can carry.
D
Signals transmitted through fiber-optic cable travel at the same speed as signals transmitted through copper cable.
This is unsupported because the author only tells us about the cost, not about the speed of transmitting signals on each type of cable.
E
The cost associated with frequent amplification of signals traveling through copper cable exceeds the extra manufacturing cost of fiber-optic cable.
This is strongly supported because the author states that switching to fiber-optic cables can save money overall despite the greater cost associated with manufacturing fiber optic cables.

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LSAT PrepTest 120 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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