JAMB Computer Science Past Questions & Answers - Page 14

66.

Translators are type of ?

A.

System software

B.

Operating system

C.

Utility programs

D.

Application software

Correct answer is A

Translators are a type of system software. They are used to convert source code written in one programming language (the source language) into another programming language (the target language). Examples of translators include compilers, interpreters, and assemblers. System software is a type of computer software designed to run a computer's hardware and application programs. It includes the operating system, device drivers, diagnostic tools, servers, windowing systems, utilities, and more

67.

At what stage in system development life cycle are all data documented in the form of detailed data flow diagrams(DFDs)

A.

System design

B.

Feasibility study

C.

System analysis

D.

Investigative study

Correct answer is C

During the System Analysis stage of the System Development Life Cycle (SDLC), all data are documented in the form of detailed Data Flow Diagrams (DFDs). The System Analysis stage involves understanding and documenting the business processes and requirements of the new system

68.

The only possible number base for 235\(_x\) among the following is ?

A.

3

B.

5

C.

4

D.

6

Correct answer is D

A number cannot contain digits that are greater than its base.
therefore 235 can possible be in base 6.

69.

How many bits are in one nibble ?

A.

2

B.

4

C.

8

D.

16

Correct answer is B

A nibble is a four-bit aggregation, or half an octet. It is also known as half-byte or tetrade. In a networking or telecommunication context, the nibble is often called a semi-octet, quadbit, or quartet. A nibble has sixteen (2^4) possible values

70.

Which of the following is a valid variable name in Python?

A.

my_variable$

B.

my_variable

C.

my-variable

D.

1my_variable

Correct answer is B

Variable names in Python must start with a letter or underscore, and can only contain letters, numbers, and underscores. The other options are invalid because they either start with a number (option C) or contain a special character (option D).