WALKER’S INTENSIVE CARE SCHOOL
ECONOMICS
Duration: 1hr 30mins
TEST 1
SECTION A
Choose the correct answer from the alternatives lettered A-D
1. Humans interpret words and pictures; C. true D. false
computers interpret only patterns of 8. A …………………. is the smallest unit
…………………. of a digital image or display.
A. Byte B. Bit A. Pixel B. resolution
C. Nibble D. Binary C. Bit D. atom
2. The binary equivalent of the decimal 9. Which bit audio provides greater
number 17 is resolution
A. 11112 B. 11102 and dynamic range, suitable for professional
C. 110002 D. 100012 audio recording and mastering, as well as
3. The following are data types except high-fidelity audio playback?
A. Date B. Field A. 24-bit audio B. 16-bit audio
C. Number D. Text C. 8-bit audio D. 32-bit audio
4. The binary number 11.1012 10. What is the file format for a word
converts to decimal as document?
A. 3.256 B. 3.625 A. .wrd B. .ppt
C. 3.652 D. 4.652 C. .doc D. .pdf
5. The acronym ASCII stands for 11. Which of the following temporary
…………………………. storage locations is found within the CPU
A. American Scientists Common that stores data and processes used by the
Intelligence Institute processor to enhance speed in task
B. American Standard Code for Information execution?
Interchange A. Registers B. RAM
C. American Standard Communication C. Memory Cache D. ROM
Information Interchange 12. Which of the following is not a machine
D. American Standard Computing cycle?
Information Interchange A. Fetch B. Decode
6. Groups of 4bits is called ……………… C. Execute D. Compare
A. Word B. byte 13. The ALU
C. Megabits D. nibble ………………………………..
7. 1 in data representation represents A. is a temporary storage in the CPU
……………. B. controls task execution in the CPU
A. yes B. no C. makes logical and arithmetic calculations
D. is the same as the CPU 15. Which of the following is an embedded
14. What does the AND operation do if both system?
input values are 1? A. An analogue wrist watch
A. Outputs 0 B. A hand mower
B. Outputs 1 C. A Tesla Cybertruck
C. Outputs either 0 or 1 randomly D. A Manual typewriting machine
D. Outputs an error information
SECTION B
Answer any two questions from this section
QUESTION 1
A. Convert the following decimal numbers into their binary representations
(i) 25 (ii)128
B. Explain what the following logical operations does in programming
(i) AND (ii)OR
C. Differentiate between the following;
(i) ROM and RAM (ii)Register and Memory Cache
Question 2
A. (i) If a computer has 8GB of storage and a programme takes up 8000 MB of memory, can
the programme be stored? Explain your reasoning.
(ii) A student claims that deleting files from a computer’s ROM can speed it up. Evaluate this
statement and explain why it is correct or incorrect.
C. (i) Briefly explain the steps involved in the machine cycle
(ii) What is a system bus?
C. (i) Explain three data types in the world of computing
(ii) Explain what embedded systems are and give three examples
(iii) Explain how the CPU functions in a computer system
Question 3
A. (i) State the steps used in clearing a bowser cache.
(ii) In computing, what is an instruction set?
C. (i) State three advantages of embedded systems
(ii) Differentiate between Control Unit (CU) and Arithmetic Logic Unit (ALU)
C. (i) Explain how binary representation is used in computers to store and process data.
(ii) What is data representation?
