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CIL MT · Computer Science

Digital Logic & Number Systems Previous Year Questions

26 Digital Logic & Number Systems (Computer Science) questions asked in CIL MT previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.

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Data Structures 56DBMS & SQL 53Theory of Computation & Compilers 27Computer Networks 22Operating Systems 21Algorithms 16Computer Organization & Architecture 16Programming in C/C++ 11Discrete Mathematics 10
Q1CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
Which of the following is the correct symbol for representing the decimal number 12 in hexadecimal system?
  1. AC
  2. BB
  3. CD
  4. DA
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Correct answer: (A) C

Q2CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
What is the output of a JK flip-flop when both inputs J = 1 and K = 1?
  1. AOutput is set to 1
  2. BOutput remains unchanged
  3. COutput is set to 0
  4. DOutput toggles
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Correct answer: (D) Output toggles

Q3CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
A 32-bit IEEE 754 single-precision floating-point number is represented as: 0100 0001 0100 1001 0000 0000 0000 0000 What is the decimal value of this floating-point number?
  1. A25.125
  2. B12.5625
  3. C100.5
  4. D50.25
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Correct answer: (B) 12.5625

Q4CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
If a D Flip-Flop has D = 1 and a rising edge of the clock occurs, what will the Q output be with reference to Sequential Circuits?
  1. AToggle
  2. BUndefined
  3. C0
  4. D1
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Correct answer: (D) 1

Q5CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
Which of the following is a necessary condition for a function f: A → B to be invertible?
  1. Af must be both one-to-one and onto
  2. Bf must be only one-to-one
  3. Cf must be only onto
  4. Df can be neither one-to-one nor onto
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Correct answer: (A) f must be both one-to-one and onto

Q6CIL MT Systems, 24 Aug 2026 (3:00 PM, CBT-26)
In an associative memory system, the argument register is used to:
  1. AStore the result of a match
  2. BGenerate memory addresses sequentially
  3. CCompare with key fields in all memory locations simultaneously
  4. DHold data to be written into memory
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Correct answer: (C) Compare with key fields in all memory locations simultaneously

Q7CIL MT Systems, 26 Mar 2017 (12:30 PM)
Which of the following represents the function of a Multiplexer?
  1. AY = A + B
  2. BY = A | B
  3. CY = A & B
  4. DY = S ? A : B
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Correct answer: (D) Y = S ? A : B

Q8CIL MT Systems, 26 Mar 2017 (12:30 PM)
The decimal number 395, when converted into binary occupies ______ binary digits, whereas when it is represented using BCD codes, occupies ______ binary digits.
  1. A12; 9
  2. B7; 12
  3. C9; 12
  4. D12; 7
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Correct answer: (C) 9; 12

Q9CIL MT Systems, 26 Mar 2017 (12:30 PM)
Which of the following statements is FALSE?
  1. AJohnson counter is a synchronous counter.
  2. BRipple counter is an asynchronous counter.
  3. CAsynchronous counters are slower than synchronous counters.
  4. DA counter may count up or count down, but cannot count both up and down.
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Correct answer: (D) A counter may count up or count down, but cannot count both up and down.

Q10CIL MT Systems, 26 Mar 2017 (12:30 PM)
The 9's compliment of the decimal number 139452 is:
  1. A971658
  2. B971659
  3. C860547
  4. D860548
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Correct answer: (C) 860547

Q11CIL MT Systems, 26 Mar 2017 (12:30 PM)
A flip-flop has a 20-nano second delay from the time its CP input goes from 1 to 0 to the time the output is complimented. What is the maximum delay in a 16-bit binary ripple counter that uses these flip-flops?
  1. A20 ns
  2. B320 ns
  3. C36 ns
  4. D16 ns
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Correct answer: (B) 320 ns

Q12CIL MT Systems, 26 Mar 2017 (12:30 PM)
If the address of the operand is embedded in the instruction code itself, then the addressing mode is termed as:
  1. ARegister mode
  2. BDirect mode
  3. CDisplacement mode
  4. DImmediate mode
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Correct answer: (B) Direct mode

Q13CIL MT Systems, 26 Mar 2017 (12:30 PM)
Under normal circumstances, the cardinality ratio of the binary relationship "Write" relating "Author" and "Book" entities is:
  1. A1 : N
  2. BN : 1
  3. C1 : 1
  4. DM : N
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Correct answer: (D) M : N

Q14CIL MT Systems, 26 Mar 2017 (12:30 PM)
Which of the following operators can be used if a portion of a given bit patterns needs to be copied to a new word, while the remainder of the new word is filled with 0s?
  1. ALogical AND
  2. BBitwise AND
  3. CBitwise OR
  4. DBitwise XOR
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Correct answer: (B) Bitwise AND

Q15CIL MT Systems, 26 Mar 2017 (12:30 PM)
Which of the following is a seven-bit code?
  1. ABiquinary code
  2. BBCD code
  3. C2421 code
  4. DExcess-3 code
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Correct answer: (A) Biquinary code

Q16CIL MT Systems, 27 Feb 2020 (8:00 AM)
According to Boolean law: (A')' = ? (the double complement of A)
  1. A0
  2. BA
  3. C(A')' (it cannot be simplified)
  4. D1
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Correct answer: (B) A

Q17CIL MT Systems, 27 Feb 2020 (8:00 AM)
For following logic diagram which expression is true? Inputs A and B each pass through a NOT gate; the two inverted signals feed one AND gate. The original A and B feed a second AND gate. The outputs of the two AND gates feed an OR gate whose output is X.
  1. A(AB) (A'B')
  2. B((A'B').(AB))'
  3. C((AB))' + (AB)
  4. DA'B' . AB
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Correct answer: (B) ((A'B').(AB))'

Explanation

The circuit computes X = A'B' + AB (XNOR). The official key marks option B.

Q18CIL MT Systems, 27 Feb 2020 (8:00 AM)
Excess-3 code of decimal number 2 is:
  1. A0101
  2. B1010
  3. C1100
  4. D0011
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Correct answer: (A) 0101

Q19CIL MT Systems, 27 Feb 2020 (8:00 AM)
In a D flip flop the out-put state Q is related with D input in what way?
  1. AQ is dependent of D
  2. BQ is same as D
  3. CQ is independent of D
  4. DQ is complement of D
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Correct answer: (B) Q is same as D

Q20CIL MT Systems, 27 Feb 2020 (8:00 AM)
The following grammar is: S → Aa | bAc | Bc | bBa A → d B → d
  1. ANot LR(1) but LALR(1)
  2. BNeither LR(1) nor LALR(1)
  3. CLR(1) and LALR(1)
  4. DLR(1) but not LALR(1)
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Correct answer: (D) LR(1) but not LALR(1)

Q21CIL MT Systems, 27 Feb 2020 (8:00 AM)
Let L be the set of all binary strings whose last two symbols are the same. The number of states in the minimum state deterministic finite state automation accepting language is _______.
  1. A2
  2. B5
  3. C8
  4. D3
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Correct answer: (B) 5

Q22CIL MT Systems, 27 Feb 2020 (8:00 AM)
Which of the following statement is true?
  1. AAny logic expression can be implemented using only NAND gates
  2. BAny logic expression can be implemented using only EXNOR gates
  3. CAny logic expression can be implemented using only NOT gates
  4. DAny logic expression can be implemented using only XOR gates
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Correct answer: (A) Any logic expression can be implemented using only NAND gates

Q23CIL MT Systems, 27 Feb 2020 (8:00 AM)
Which is the correct method to obtained 10's compliment of a decimal number?
  1. AThe minuend is added to the 10's complement of the subtrahend and carry is dropped
  2. BThe 10's complement of a decimal number is equal to 9's complement of given number minus one
  3. CThe subtrahend is added to the 10's complement of the minuend and carry is dropped
  4. DThe 10's complement of a decimal number is equal to 9's complement of given number plus one
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Correct answer: (D) The 10's complement of a decimal number is equal to 9's complement of given number plus one

Q24CIL MT Systems, 27 Feb 2020 (8:00 AM)
Which of the following is equivalent of the Boolean expression given below? A + A'·B + A·B'
  1. AA + B
  2. BA + B'
  3. CB + A'
  4. DB' + A'
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Correct answer: (A) A + B

Q25CIL MT Systems, 27 Feb 2020 (8:00 AM)
A negative edge triggered flip flop transfers data from input to output on the:
  1. ALOW to HIGH transition of clock pulse
  2. BBEFORE transition of clock pulse
  3. CHIGH to LOW transition of clock pulse
  4. DWITHOUT transition of clock pulse
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Correct answer: (C) HIGH to LOW transition of clock pulse

Q26CIL MT Systems, 27 Feb 2020 (8:00 AM)
The following grammar is: S → Aa | bAc | dc | bda A → a
  1. ANeither LALR(1) nor SLR(1)
  2. BLALR(1) but not SLR(1)
  3. CNot LALR(1) but SLR(1)
  4. DLALR(1) and SLR(1)
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Correct answer: (B) LALR(1) but not SLR(1)

How to use these CIL MT Computer Science questions

Every question here was asked in a real CIL MT 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 CIL MT papers as timed tests to check your speed under exam conditions.

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