Competitive Exams : Computer Awareness - Mix (Set 1)

Question 1

Convert the decimal number $45_{10}$ into its binary equivalent.

Accepted Answer

C) $101101_2$

Answer

A) $101100_2$

Answer

B) $110101_2$

Answer

D) $111001_2$

Question 2

What is the decimal equivalent of the binary number $11010_2$?

Accepted Answer

B) $26_{10}$

Answer

A) $25_{10}$

Answer

C) $27_{10}$

Answer

D) $28_{10}$

Question 3

Convert the hexadecimal number $3D_{16}$ into its binary equivalent.

Accepted Answer

A) $00111101_2$

Answer

B) $00111011_2$

Answer

C) $01101101_2$

Answer

D) $00101101_2$

Question 4

What is the hexadecimal equivalent of the binary number $11101011_2$?

Accepted Answer

D) $DB_{16}$

Answer

A) $EB_{16}$

Answer

B) $EA_{16}$

Answer

C) $FB_{16}$

Question 5

Perform binary addition: $1011_2 + 110_2$.

Accepted Answer

B) $10001_2$

Answer

A) $10001_2$

Answer

C) $11001_2$

Answer

D) $11101_2$

Question 6

What is the 1's complement of the binary number $1011010_2$?

Accepted Answer

C) $0100101_2$

Answer

A) $1011010_2$

Answer

B) $0100111_2$

Answer

D) $1100101_2$

Question 7

Find the 2's complement of the binary number $1101100_2$.

Accepted Answer

A) $0010100_2$

Answer

B) $0010011_2$

Answer

C) $0010101_2$

Answer

D) $0010000_2$

Question 8

Convert the octal number $72_8$ into its binary equivalent.

Accepted Answer

D) $111010_2$

Answer

A) $111001_2$

Answer

B) $110010_2$

Answer

C) $101110_2$

Question 9

What is the octal equivalent of the binary number $1011101_2$?

Accepted Answer

A) $135_8$

Answer

B) $125_8$

Answer

C) $133_8$

Answer

D) $141_8$

Question 10

Perform binary subtraction using 2's complement: $1100_2 - 101_2$.

Accepted Answer

B) $1000_2$

Answer

A) $1011_2$

Answer

C) $0111_2$

Answer

D) $1001_2$

Question 11

A logic gate has two inputs, A and B. Its output is high (1) only when both A and B are high (1). Which type of gate is this?

Accepted Answer

A) AND gate

Answer

B) OR gate

Answer

C) NOT gate

Answer

D) XOR gate

Question 12

Which logic gate produces a low (0) output only when all of its inputs are high (1)?

Accepted Answer

B) NAND gate

Answer

A) OR gate

Answer

C) NOR gate

Answer

D) XOR gate

Question 13

Consider a logic gate with input A=0 and B=1. If the output is 1, which of the following gates could it be?

Accepted Answer

C) OR gate

Answer

A) AND gate

Answer

B) NOR gate

Answer

D) XNOR gate

Question 14

The output of a NOT gate is 0. What must be its input?

Accepted Answer

D) 1

Answer

A) 0

Answer

B) Undefined

Answer

C) Low

Question 15

Which of the following gates is considered a universal gate, meaning it can be used to construct all other logic gates?

Accepted Answer

A) NAND gate

Answer

B) XOR gate

Answer

C) AND gate

Answer

D) NOT gate

Question 16

If both inputs to an XOR gate are identical (e.g., A=0, B=0 or A=1, B=1), what will be its output?

Accepted Answer

B) 0

Answer

A) 1

Answer

C) Depends on prior state

Answer

D) Undefined

Question 17

A logic circuit consists of an AND gate followed by a NOT gate. This combination is equivalent to which single logic gate?

Accepted Answer

C) NAND gate

Answer

A) OR gate

Answer

B) XOR gate

Answer

D) NOR gate

Question 18

For a 3-input OR gate, how many input combinations will result in a high (1) output?

Accepted Answer

D) 6

Answer

A) 1

Answer

B) 3

Answer

C) 7

Question 19

The Boolean expression for an XNOR gate with inputs A and B is:

Accepted Answer

A) $AB + A'B'$

Answer

B) $A'B + AB'$

Answer

C) $(A+B)'$

Answer

D) $(AB)'$

Question 20

Which logic gate's output is always the complement of its input?

Accepted Answer

B) NOT gate

Answer

A) AND gate

Answer

C) OR gate

Answer

D) XOR gate