JAMB Computer Science Past Questions & Answers - Page 47

231.

What controls the way in which the computer system function and provides a means by which users can interact with the computer

A.

Application software

B.

Internet

C.

Operating system

D.

Control unit

Correct answer is C

An Operating System (OS) is a software that acts as an interface between computer hardware components and the user

232.

The set of rules that defines the combination of symbols that are considered to be correctly structured statements or expressions in that language is called _________

A.

Syntax

B.

Instruction

C.

Program

D.

Domain

Correct answer is A

In computer science, the syntax of a computer language is the set of rules that defines the combinations of symbols that are considered to be correctly structured statements or expressions in that language

233.

Which of the following is termed as the minimum error code?

A.

binary code

B.

gray code

C.

excess 3 code

D.

octal code

Correct answer is B

Gray code is considered minimum error code because they are less error prone for mechanical devices that involve making and breaking electrical circuits because they only change in one bit position at a time

234.

The binary system has the radix of ________

A.

0

B.

1

C.

2

D.

½

Correct answer is C

Binary consists of two digits, hence its radix being 2.

235.

How many different values can a bit have?

A.

2

B.

4

C.

10

D.

256

Correct answer is A

A bit can have 2 different values