Competitive Exams : Computer Awareness - Mix (Set 2)

Question 1

A sensor records a binary value of `10110` from a digital system. This value represents a specific count.

What is the decimal equivalent of this binary reading?

Accepted Answer

C) 22

Answer

A) 19

Answer

B) 21

Answer

D) 24

Question 2

A digital timer displays a value of 45 seconds. This decimal value needs to be processed by a computer system.

How would this value be represented in 8-bit binary form?

Accepted Answer

A) 00101101

Answer

B) 00110101

Answer

C) 01011001

Answer

D) 01101101

Question 3

Two memory registers in a CPU store the binary numbers `1101` and `0111`. The CPU needs to perform an addition operation on these values.

What is the sum of these two binary numbers?

Accepted Answer

D) 10100

Answer

A) 10010

Answer

B) 10001

Answer

C) 11110

Question 4

A control system needs to compute $15 - 8$. If 15 is `1111` and 8 is `1000` (using 4-bit binary representation), the subtraction is to be performed using the two's complement method.

What is the result of $1111 - 1000$ in binary using two's complement?

Accepted Answer

A) 0111

Answer

B) 1001

Answer

C) 0101

Answer

D) 1110

Question 5

A network device uses a specific 8-bit status code: `10110100`. For error checking, its one's complement needs to be calculated.

What is the one's complement of the binary number `10110100`?

Accepted Answer

B) 01001011

Answer

A) 01001010

Answer

C) 01001100

Answer

D) 01010100

Question 6

A processor needs to store the decimal number -13 in an 8-bit register.

How would the decimal number -13 be represented in 8-bit two's complement form?

Accepted Answer

A) 11110011

Answer

B) 00001101

Answer

C) 10001101

Answer

D) 11110010

Question 7

A simple processor performs a multiplication of the binary number `101` by `11`.

What is the product of `101` and `11` in binary?

Accepted Answer

B) 1111

Answer

A) 1011

Answer

C) 10011

Answer

D) 1101

Question 8

A scientific instrument outputs a binary value `10.11` which includes a fractional part.

What is the decimal equivalent of the binary number `10.11`?

Accepted Answer

C) 2.75

Answer

A) 2.25

Answer

B) 2.50

Answer

D) 3.25

Question 9

A memory address is represented as `A3F` in hexadecimal format for compactness.

What is the binary equivalent of the hexadecimal memory address `A3F`?

Accepted Answer

D) 101000111111

Answer

A) 101000101111

Answer

B) 101001111110

Answer

C) 100100111111

Question 10

In a data packet processing unit, a binary value `11000` needs to be divided by `100`.

What is the quotient of `11000` divided by `100` in binary?

Accepted Answer

C) 110

Answer

A) 101

Answer

B) 100

Answer

D) 111

Question 11

A security system requires two conditions to be met simultaneously for an alarm to trigger: the door sensor must be active (1) AND the motion sensor must be active (1).

Which basic logic gate represents this scenario's requirement for the alarm to trigger?

Accepted Answer

A) AND gate

Answer

B) OR gate

Answer

C) NOT gate

Answer

D) XOR gate

Question 12

A backup power system activates if either the main power fails (input A is 1) OR the auxiliary battery level drops below a threshold (input B is 1).

Which basic logic gate describes this activation logic?

Accepted Answer

B) OR gate

Answer

A) AND gate

Answer

C) NOR gate

Answer

D) NAND gate

Question 13

A warning light on a control panel should be OFF (0) when the system is running (input is 1), and ON (1) when the system is NOT running (input is 0).

Which basic logic gate correctly represents the behavior of this warning light?

Accepted Answer

C) NOT gate

Answer

A) AND gate

Answer

B) OR gate

Answer

D) XOR gate

Question 14

A parity checker circuit in a communication system is designed to generate a '1' output if an odd number of its two inputs are '1'.

Which basic logic gate performs this specific function for two inputs?

Accepted Answer

D) XOR gate

Answer

A) AND gate

Answer

B) OR gate

Answer

C) NOR gate

Question 15

A digital designer needs to construct a complex logic circuit using only one type of basic gate. The chosen gate has the property that it can implement all other basic logic gates (AND, OR, NOT).

Which universal logic gate is being referred to in this scenario?

Accepted Answer

A) NAND gate

Answer

B) XOR gate

Answer

C) AND gate

Answer

D) Buffer gate

Question 16

Consider a logic gate whose output is HIGH (1) only when all of its inputs are LOW (0). In all other input combinations, its output is LOW (0).

Which basic universal logic gate exhibits this behavior?

Accepted Answer

B) NOR gate

Answer

A) NAND gate

Answer

C) AND gate

Answer

D) OR gate

Question 17

A technician is testing an unknown logic gate with two inputs, A and B, and one output, Q. They record the following truth table:

A	B	Q
0	0	0
0	1	0
1	0	0
1	1	1

Which basic logic gate does this truth table represent?

Accepted Answer

A) AND gate

Answer

B) OR gate

Answer

C) XOR gate

Answer

D) NAND gate

Question 18

A control circuit for a safety mechanism needs to activate (output HIGH) if the primary condition A is met AND the secondary condition B is met. Alternatively, the mechanism also activates if NEITHER condition A NOR condition B is met.

Which single logic gate best represents this overall behavior where the output is HIGH if inputs are identical?

Accepted Answer

D) XNOR gate

Answer

A) AND gate

Answer

B) OR gate

Answer

C) XOR gate

Question 19

If inputs A=1 and B=0 are fed into an AND gate, and its output is then fed into an OR gate along with input A, what will be the final output?

Accepted Answer

B) 1

Answer

A) 0

Answer

C) Undefined

Answer

D) Depends on gate delay

Question 20

Convert the binary number $(1011.01)_2$ into its decimal equivalent.

Accepted Answer

C) 11.25

Answer

A) 11.125

Answer

B) 10.25

Answer

D) 10.125