Convert (1111)₂ into decimal equivalents.
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Correct answer: (D) 15
BEL PE · Computer Science
Digital Logic & Number Systems Previous Year Questions
16 Digital Logic & Number Systems (Computer Science) questions asked in BEL PE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
- 16 questions
- Official answer key
- Free
Other Computer Science topics
Which of the following statement is CORRECT?
I. An input device is an electromechanical device that accepts data from the outside world and translates it into a form a computer can interpret.
II. An output device is an electromechanical device that accepts data from a computer and translates them into a form suitable for use by outside world.
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Correct answer: (B) Both I and II
What is the decimal conversion of (630.4)₈?
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Correct answer: (D) 408.5
Which of the following statement is CORRECT about software testing?
I. White box testing is performed early in the testing phase.
II. Black box testing tends to be applied during later stages of testing.
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Correct answer: (B) Both I and II
How many distinct binary trees are constructed using 5 nodes?
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Correct answer: (A) 42
Which of the following is the type of parallel processor system as per Flynn's taxonomy?
I. Single instruction, single data (SISD) stream
II. Single instruction, multiple data (SIMD) stream
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Correct answer: (D) Both I and II
Which of the following statement is CORRECT regarding Entropy, which is a measurement of the uncertainty in data?
I. Low entropy indicates that the data labels are quite uniform.
II. High entropy means the labels are in chaos.
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Correct answer: (D) Both I and II
Any address generated by the CPU is commonly referred to as a ______ where an address seen by the memory unit i.e. the one loaded into the memory address register is known as ______.
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Correct answer: (B) logical address; physical address
What is the decimal conversion of (1010.011)₂?
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Correct answer: (B) 10.375
Which of the following pair is CORRECT?
I. Associative law : (x*y)*z = x*(y*z)
II. Distributive law : x*(y+z) = (x*y)+(x*z)
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Correct answer: (B) Both I and II
Which of the following is part of the hierarchical storage system?
I. Cache memory
II. Near-line mass storage devices
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Correct answer: (B) Both I and II
Which of the following statement is CORRECT with reference to syntax-directed Translation Schemes?
I. Synthesized translation defines the value of the translation of the nonterminal on the left side of the production as a function of the translations of the nonterminal on the right side.
II. Translation of a non-terminal on the right side of the production is defined in terms of a translation of the non-terminal on left. Such translation is called inherited translation.
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Correct answer: (D) Both I and II
Which of the following pair is CORRECT?
I. Half adder - A combinational circuit that performs the addition of two bits
II. Full adder - A combinational circuit that performs the addition of three bits
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Correct answer: (B) Both I and II
A ______ is a combinational circuit that selects binary information from one of many input lines and directs it to a single output line.
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Correct answer: (D) digital multiplexer
Which of the following statement is correct regarding complements?
I. Complements are used in digital computers for simplifying the subtraction operation and for logical manipulations.
II. There are two types of complements for each base-r system: the r's complement and (r-1)'s complement.
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Correct answer: (A) Both I and II
What is the output function Z of an XOR gate with inputs X and Y?
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Correct answer: (C) Z = XY' + X'Y
How to use these BEL PE Computer Science questions
Every question here was asked in a real BEL PE paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full BEL PE papers as timed tests to check your speed under exam conditions.