PGT Computer Science (Level-3), (HTET Practice MCQs) (Part-IV)Total Questions: 10091. Loop unrolling is a code optimization technique:A. that avoids tests at every iteration of the loop.B. that improves performance by decreasing the number of instructions in a basic block.C. that exchanges inner loops with outer loops.D. that reorders operations to allow multiple computations to happen in parallel.Correct Answer: A. that avoids tests at every iteration of the loop.92. What will be the hexadecimal value in the register ax (32-bit) after executing the following instructions?mov al, 15 mov ah, 15 xor al, al mov cl, 3 shr ax, cl Codes:A. OF00 hB. OFOFhC. 01E0 hD. FFFF hCorrect Answer: C. 01E0 h93. Which of the following statements is false?A. Top-down parsers are LL parsers where first L stands for left-to-right scan and second L stands for a leftmost derivation.B. (000)* is a regular expression that matches only strings containing an odd number of zeroes, including the empty string.C. Bottom-up parsers are in the LR family, where L stands for left-to-right scan and R stands for rightmost derivation.D. The class of context free languages is closed under reversal. That is, if L is any context - free language, then the language Lᴿ = {wᴿ : w ∈ L} is context - free.Correct Answer: B. (000)* is a regular expression that matches only strings containing an odd number of zeroes, including the empty string.94. System calls are usually invoked by using:A. A privileged instructionB. An indirect jumpC. A software interruptD. PollingCorrect Answer: C. A software interrupt95. The .................... transfers the executable image of a C++ program from hard disk to main memory.A. CompilerB. LinkerC. DebuggerD. LoaderCorrect Answer: D. Loader96. In software testing, how the error, fault and failure are related to each other?A. Error leads to failure but fault is not related to error and failure.B. Fault leads to failure but error is not related to fault and failure.C. Error leads to fault and fault leads to failure.D. Fault leads to error and error leads to failure.Correct Answer: C. Error leads to fault and fault leads to failure.97. Which of the following is not a software process model?A. PrototypingB. IterativeC. TimeboxingD. GlassboxingCorrect Answer: D. Glassboxing98. How many solutions are there for the equation x + y + z + u = 29 subject to the constraints that x ≥ 1, y ≥ 2, z ≥ 3 and u ≥ 0?A. 4960B. 2600C. 23751D. 8855Correct Answer: B. 260099. A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each?A. 32 GBB. 64 GBC. 16 GBD. 1 GBCorrect Answer: C. 16 GB100. ................... uses electronic means to transfer funds directly from one account to another rather than by cheque or cash.A. M-BankingB. E-BankingC. O-BankingD. C-BankingCorrect Answer: B. E-BankingSubmit Quiz« Previous12345678910
