Daily Dose Practice Exam questions

Q1. 

(a)     Explain the difference between hardware and software.

Hardware is the physical components parts of the computer. Example of a piecie of hardware is the computer motherboard.

Software is the program and code or instructions that the computer is given to use.

(b)     (i)      Which of the following is a typical value for the clock speed of a processor?

512 MB         128 kbps              80 GB           2 Mb/s             3.0 GHz
(circle your answer)

(ii)     Which of the following is a typical value for the capacity of a memory card for use with a digital camera or other device?

512 MB         256 bits/sec         50 GB           2 bytes            3.0 GHz
(circle your answer)

Q2.
A program has been written to analyse the results of a survey.  For each of the following, name a suitable data type and give a reason for your choice:

(a)     number of cars owned by a household;

data type: Integer

reason: Dealing with whole numbers only

(b)     a telephone number such as 0122456789;

data type: String

reason: So leading zeros do not dissapear and because it will not need calculations preforming on them.

(c)     whether a household’s accommodation has central heating or not,

data type: Boolean

reason: It is a yes or no question

(d)     the average number of cars owned by the households.

         data type: floating point

reason: Average may not be an whole number

Q3.
Convert the denary value 61 into

(a)     binary= 111101

(b)     hexadecimal= 3D

Q4.

A computer program contains the following fragment:

Boolean: LY
Integer: Y
¼
LY := (Y mod 4 = 0)  AND ( NOT (Y mod 100 = 0) OR (Y mod 400 = 0) )

(The function A mod B returns the remainder when A is divided by B, eg. 11 mod 3 returns the value 2.)

(a)     What is meant by a Boolean variable? A variable with only two possible answers e.g true or false.

(b)     What value would be assigned to the variable LY, if the variable Y contains

(i)      1999?----

(ii)     2000?----

Q5.

How many bits make up one byte? 8

Q6.
Using a High Level Language with which you are familiar, give one example of each of the following.

(a)     Data assignment. A=b+c

 (b)    Selection (Conditional step) If A=8 Then "Good"

 (c)    Repetition (Iteration) If A<8 then A=A+1

Q7. 

(a)     A binary pattern might represent a decimal integer or a decimal real number.  In a computing context, give an example of

(i)      a decimal integer= 65

(ii)     a decimal real number= 34.5656