Reading-Comprehension-Lesson 78

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   Among the problems that must be solved if even more powerful but smaller
 computers are to become viable propositions is the heat computer
 circuits generate. The present market leader, with 300, 000 chips
 in 100 cubic feet, requires a powerful refrigeration system; the
5  kind of super-computers now being discussed might cram half a million
 chips into a space the size of a shoe box, and would probably need
 a bath of liquid nitrogen to keep them from melting.

1. Today's leading large computer
(A) is cooled by a system based on liquid nitrogen.
(B) generates considerable heat in its circuits.
(C) is smaller in size than the super computers referred to.
(D) has half a million chips.
2. It may be inferred from the passage that
(A) if chips are packed closer together, a computer needs stronger refrigeration.
(B) a computer the size of a shoe- box generates more heat than a larger one.
(C) more powerful computers tend to be smaller.
(D) the leading large computer is now cooled by liquid nitrogen.
3. According to the passage, the super-computers
(A) are already viable propositions.
(B) might melt in a bath of liquid nitrogen.
(C) would pack 300,000 chips into about 100 cubic feet.
(D) would be more compact than today's models.
4. The passage deals mainly with
(A) the number of chips modern computers use.
(B) the problem of cooling tomorrow's super-computers.
(C) the optimum size for computers.
(D) the cooling properties of liquid nitrogen.

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