ISRO Scientist/Engineer Question Paper Computer Science 2017

A cache memory needs an access time of 30 ns and main memory 150 ns, what is the average access time of CPU (assume hit ratio = 80%)?

60 ns
30 ns
150 ns
70 ns

Answer

Which one of the following Boolean expressions is NOT a tautology?

( ( a → b ) ∧ ( b → c ) ) → ( a → c )
( a ↔ c ) → (~ b → ( a ∧ c ))
( a ∧ b ∧ c ) → ( c ∨ a )
a → ( b → a )

Answer

What is the minimum number of two-input NAND gates used to perform the function of two input OR gate?

One
Two
Three
Four

Answer

When two n-bit binary numbers are added the sum will contain at the most

n bits
( n + 3) bits
( n + 2) bits
( n + 1) bits

Answer

The 2-input XOR has a high output only when the input values are

low
high
same
different

Answer

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