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AS & A Level Computer Science 9608 Questions And Answers 100% Guaranteed Success.

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AS & A Level Computer Science 9608
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1.1 Number Representation
What are binaries? - correct answer.o Values stored as a series of ones and zeroes
o A single 0 or 1 is called a binary digit or bit.
o Any group of 0s & 1s can represent a character
128 64 32 16 8 4 2 1
00000000
o E.g. 65 in binary is 1000001

1.1 Number Representation
What are BCD Representation? - correct answer.o Each digit in the number is written
separately in a
series of 4 bits
o E.g. 398 in BCD
o 3 = 0011 9 = 1001 8 = 1000
o 398 = 0011 1001 1000
o Use of BCD: used in business applications (arithmetic)
where every digit has to be retained in a result

1.1 Number Representation
What are Hexadecimal Number? - correct answer.o The base-16 number system
(counting in 16)
o After 9, numbers represented by letters from A to F
256 16 1
000
-(HEXADECIMAL TO DENARY)
o E.g. A5 in Denary = (16×10) + (1×5) = 165

-(DENARY TO HEXADECIMAL)
o E.g. 65 in Hexadecimal = 65 ÷ 16 = 4 𝑅𝑒𝑚𝑎𝑖𝑛𝑑𝑒𝑟 1
∴ = 41 H

-(HEXADECIMAL TO BINARY)
o Quick way of translating hexadecimal to binary is by converting the hexadecimal to
BCD
o E.g.
A5 in Binary:

,A = 1010, 5 = 0101
A5 = 10100101

1.1 Number Representation
What are 2's Complement? - correct answer.o We can represent a negative number in
binary by making the most significant bit (MSB) a sign bit, which will tell us whether the
number is positive or negative
-128 64 32 16 8 4 2 1
MSB 0 0 0 0 0 0 LSB

1.1.2 Images
How data for a bit-mapped image is encoded? - correct answer.A bitmapped image is
encoded by assigning a solid color to each pixel.

1.1.2 Images
What are Pixels? - correct answer.Pixels are small blocks of addressable areas and the
color they have is represented by binary and stored as bits.

1.1.2 Images
What are File Header? - correct answer.They are a few bytes of binary and represents
basic information about the graphic, such as image resolution, size and number of
colors.

1.1.2 Images
Define Image Resolution? - correct answer.It is the amount of pixels an image contains
per inch/cm

1.1.2 Images
Define Screen Resolution? - correct answer.It is the number of pixels per row by the
number of pixels per column.

1.1.2 Images
What is color depth? - correct answer.It is the number of bits used to represent the
color of a single pixel
An image with n bits has 2^n colors per pixel.
File Size = Number of Pixels x Color Depth

1.1.2 Images
What is a vector graphic? - correct answer.They are images defined using mathematics
&
geometry i.e. points, lines, curves & shapes/polygon(s)
Objects and properties are stored mathematically

1.1.2 Images
What is a drawing list? - correct answer.It is a set of commands used to define a vector

, 1.1.2 Images
How typical features found in bit-mapped and vector graphics software are
used in practice? - correct answer.Vectors are scalable and do not pixelate like a
bitmap image therefore are used by corporations to create logos as they can be resized
without losing quality

Bit-mapped images are used by general computer users as they are not big in file size
and can be manipulated.

1.3 Sound
How sound is represented and encoded? - correct answer.-Sound are vibrations that
travel through a medium
-Sound waves are continuous in nature, which means there is infinite amount of detail
for a sound.
• Analogue to Digital Converter (ADC): converts analogue sound into digital signals
which can be digitally stored
• Digital to Analogue Converter (DAC): converts digital signals into analogue sound that
can be output

• An analogue sound wave is picked up by a microphone
and sent to an ADC in the form of analogue electrical
signals. Once the sound wave is converted into a digital
form it can be stored and manipulated

1.3 Sound
What is Sampling Rate? - correct answer.• Sound in analogue form can be represented
by wave forms; the height of these waves can be sampled regularly with the height
being represented by a bit-code

• Sampling Rate: number of samples taken per second

1.3 Sound
What is Sampling Resolution? - correct answer.It is the No. of bits assigned to each
sample
• The sampling resolution allows you to set the range of volumes storable for each
sample

• The quality of a sound produced using a sound sampler depends on the sampling rate
and sampling resolution

1.3 Sound
how file sizes depend on sampling rate and sampling resolution? - correct answer.•
Higher sampling rate/resolution means larger file size

1.3 Sound

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