Jamia Millia Islamia MCA Computer Previous Year Questions (PYQs) – Page 1 of 29
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The 10’s complement of $455$ is —
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Solution
10’s complement = $10^3 - 455 = 1000 - 455 = 545$
The 2’s complement of $5$ is —
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Solution
Binary of $5 = 0101$
1’s complement = $1010$
Add 1 → $1011$ (2’s complement)
The decimal equivalent of $(0.101)_2$ will be —
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Solution
$(0.101)_2 = (1×2^{-1}) + (0×2^{-2}) + (1×2^{-3}) = 0.5 + 0 + 0.125 = 0.625$
Which of the following is false?
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Solution
$x·x' = 0$ (not 1) — this is false.
The Boolean expression $A + BC$ is the reduced form of —
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Solution
$$(A + B)(A + C) = A + BC$$ (by distributive law)
The expression of an XOR gate is —
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Solution
The logical expression for XOR (Exclusive OR) is true when inputs are different,
therefore its expression is $A'B + AB'$.
Which of the following statements about RAM is correct?
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Solution
RAM is volatile memory used for temporary storage during program execution.
If $M$ denotes the number of memory locations and $N$ denotes the word size, then an expression that denotes the storage capacity is —
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Solution
Storage capacity = (Number of memory locations) × (Word size)
$\Rightarrow$ Storage capacity = $M \times N$
Which of the following best distinguishes a sequential circuit from a combinational circuit?
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Solution
Sequential circuits depend on both current inputs and past states (memory), unlike combinational circuits.
What is the high-speed memory between the main memory and the CPU called?
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Solution
The fastest memory between CPU and main memory is Cache Memory, used to speed up data access.
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