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MCQs — Computer Systems

Practice questions for Computer Science.

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Question 181

A company upgrades from a 32-bit processor to a 64-bit processor. Which improvement can it expect?

A. The processor will no longer need memory

B. The monitor will show more colours automatically

C. The processor can handle more bits in one operation

D. The computer will need no power

Question 182

What is the smallest unit of data in a computer?

A. Byte

B. Bit

C. Kilobyte

D. Word

Question 183

How many bits are there in one byte?

A. 4

B. 16

C. 2

D. 8

Question 184

The term 'bit' is short for:

A. Basic item

B. Binary digit

C. Big token

D. Byte index

Question 185

A byte can represent how many different values?

A. 8

B. 64

C. 256

D. 1024

Question 186

In ASCII, a single English letter such as 'A' is normally stored in:

A. One byte

B. One kilobyte

C. Half a bit

D. One megabyte

Question 187

The binary number system uses which digits?

A. 0 to 9

B. 0 and 1

C. 0 to 7

D. 0 to 9 and A to F

Question 188

Which of the following is a valid binary number?

A. 10201

B. 1234

C. 110011

D. 2101

Question 189

In the binary number 1000, what is the place value of the leftmost 1?

A. 1

B. 4

C. 10

D. 8

Question 190

What is the decimal value of the binary number 1011?

A. 11

B. 9

C. 10

D. 13

Question 191

What is the decimal value of the binary number 11001?

A. 19

B. 26

C. 25

D. 27

Question 192

What is the largest decimal number that can be stored using 4 bits?

A. 15

B. 8

C. 16

D. 31

Question 193

Why do computers use the binary system?

A. Electronic circuits have two states, on and off, which match 0 and 1

B. Binary numbers are shorter than decimal numbers

C. Humans find binary easier to read

D. Computers cannot store any other digits in memory

Question 194

The decimal number system has a base of 10 and uses the digits:

A. 0 and 1

B. 0 to 7

C. 1 to 10

D. 0 to 9

Question 195

In the decimal number 4725, what is the value of the digit 7?

A. 7

B. 70

C. 700

D. 7000

Question 196

Another name for the decimal number system is:

A. Denary

B. Binary

C. Hexadecimal

D. Octal

Question 197

Which expression correctly shows the decimal number 253 using place values?

A. 2 × 10 + 5 × 100 + 3

B. 2 × 1000 + 5 × 10 + 3

C. 2 × 100 + 5 × 10 + 3 × 1

D. 2 + 5 + 3

Question 198

A decimal number has 1 in the hundreds place, 9 in the tens place and 4 in the ones place. What is the number?

A. 149

B. 194

C. 419

D. 914

Question 199

The base of the hexadecimal number system is:

A. 2

B. 10

C. 8

D. 16

Question 200

Which set of symbols is used in hexadecimal?

A. 0 and 1

B. 0 to 9 and A to F

C. 0 to 7

D. A to Z only

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