Information representation — AS & A Level Computer Science (9618) questions by topic
Calculating a normalised binary floating-point representation from a given mantissa and exponent size, converting a decimal value using two's complement form, and stating how many unique values 16 bits can represent are the core demands, worth 3 to 14 marks across 31 real questions from 2023 to 2025 papers.
Calculate, explain, state, give and convert dominate the command words, and calculate requires full working shown in the specified bit format, not just a final decimal answer. Because a single misplaced bit invalidates an otherwise correct method, showing working and checking it against instant marking is the fastest way to isolate exactly where a conversion went wrong.
May–June 2025, Paper 11
A computer stores images and text files. One of the images is a bitmapped image. Complete the table by writing the answer for each statement. Statement Answer ----------- --------…
Answer this question and get it marked →May–June 2025, Paper 12
Convert the denary integer 558 into 12-bit binary and hexadecimal. Binary ........................................................................... Hexadecimal…
Answer this question and get it marked →May–June 2025, Paper 13
A student paints a picture in an art class. The student takes a photograph of the picture using a digital camera. The digital camera creates an image with a resolution of 2…
Answer this question and get it marked →A computer can perform logical and arithmetic shifts. Show the result of a logical left shift of 2 places on the two's complement binary integer 11001010.
Answer this question and get it marked →May–June 2025, Paper 31
Numbers are stored in a computer using binary floating-point representation with: - 10 bits for the mantissa - 6 bits for the exponent - two's complement form for both the…
Answer this question and get it marked →May–June 2025, Paper 32
Numbers are stored in a computer using binary floating-point representation with: - 12 bits for the mantissa - 4 bits for the exponent - two's complement form for both the…
Answer this question and get it marked →May–June 2025, Paper 33
Numbers are stored in a computer using binary floating-point representation with: - 8 bits for the mantissa - 8 bits for the exponent - two's complement form for both the mantissa…
Answer this question and get it marked →May–June 2024, Paper 13
Complete the following description. A kibibyte has a ............... prefix. Three kibibytes is the same as ............... bytes. A megabyte has a ............... prefix. Two…
Answer this question and get it marked →A photograph is stored as a bitmap image. The photograph has a resolution of 4000 pixels wide by 3000 pixels high. The bit depth is 4 bytes. Calculate an estimate for the file…
Answer this question and get it marked →May–June 2024, Paper 31
Real numbers are stored in a computer system using floating-point representation with: - 10 bits for the mantissa - 6 bits for the exponent - two's complement form for both the…
Answer this question and get it marked →May–June 2024, Paper 32
Describe the effect of changing the allocation of bits used for the mantissa and for the exponent in a floating-point number with a fixed total number of bits.
Answer this question and get it marked →May–June 2024, Paper 33
Calculate the denary value of the given normalised floating-point number. Show your working. The number is given as: Mantissa: 0 1 0 0 1 1 1 1 0 0 Exponent: 0 0 1 0 0 1
Answer this question and get it marked →October–November 2024, Paper 11
State one difference between a tebibyte and a gigabyte.
Answer this question and get it marked →October–November 2024, Paper 12
A student takes a photograph of a science experiment. The photograph is saved as a bitmapped image. Define the following bitmap terms. Colour depth ... File header ...
Answer this question and get it marked →October–November 2024, Paper 13
A computer system stores text, images and sound. A character set is used to represent characters in a computer. Identify and describe one character set. Character set ...…
Answer this question and get it marked →Convert the hexadecimal number 1FAB into denary. Working ... Denary value ...
Answer this question and get it marked →October–November 2024, Paper 31
Calculate the normalised binary floating-point representation of +201.125 in this system. Show your working. Record your answer as a 10-bit Mantissa and a 6-bit Exponent.
Answer this question and get it marked →October–November 2024, Paper 32
Calculate the denary value of the given normalised binary floating-point number. Show your working. Mantissa: 0 1 0 0 0 1 1 1 0 1 1 1 Exponent: 0 1 1 1
Answer this question and get it marked →October–November 2024, Paper 33
Calculate the normalised binary floating-point representation of +201.125 in this system. Show your working. Complete the mantissa (10 bits) and exponent (6 bits) boxes.
Answer this question and get it marked →May–June 2023, Paper 12
Data in a computer is stored in binary form. State the number of unique binary values that can be represented in 16 bits.
Answer this question and get it marked →May–June 2023, Paper 13
A computer stores data in binary form. Draw one line from each description to its matching denary value. Descriptions: - The smallest integer that can be represented in 8-bit…
Answer this question and get it marked →May–June 2023, Paper 31
Numbers are stored in two different computer systems by using floating-point representation. System 1 uses: - 10 bits for the mantissa - 6 bits for the exponent - two's complement…
Answer this question and get it marked →May–June 2023, Paper 32
Numbers are stored in a computer using floating point representation with: - 10 bits for the mantissa - 6 bits for the exponent - two's complement form for both the mantissa and…
Answer this question and get it marked →May–June 2023, Paper 33
Calculate the normalised floating-point representation of 113.75 and show how it would be represented in each of these two systems. Show your working. Complete the mantissa and…
Answer this question and get it marked →October–November 2023, Paper 11
Draw one line from each vector graphic term to its most appropriate description. Term: - drawing list - drawing object - property Description: - a component created using a…
Answer this question and get it marked →October–November 2023, Paper 12
A real-time video of a music concert needs to be streamed to subscribers. Tick (✓) one box to identify the most appropriate type of compression and justify your answer. Lossy…
Answer this question and get it marked →October–November 2023, Paper 13
Describe the impact of increasing the image resolution on the quality of a bitmap graphic.
Answer this question and get it marked →October–November 2023, Paper 31
Real numbers are stored in a computer using floating-point representation with: - 12 bits for the mantissa - 4 bits for the exponent - two's complement form for both the mantissa…
Answer this question and get it marked →October–November 2023, Paper 32
Real numbers are stored in a computer using floating point representation with: - 10 bits for the mantissa - 6 bits for the exponent - two's complement form for both the mantissa…
Answer this question and get it marked →October–November 2023, Paper 33
Write the normalised floating-point representation of +65.25 in this system. Show your working. Complete the Mantissa (12-bit) and Exponent (4-bit) bit boxes.
Answer this question and get it marked →Other AS & A Level Computer Science topics
- Programming (79)
- Data types and structures (74)
- Algorithm design and problem-solving (36)
- Communication and internet technologies (29)
- Boolean algebra and logic circuits (29)
- Processor fundamentals (27)
- Software development (27)
- Hardware (18)
- System software (17)
- Security, privacy and integrity of data (13)
- Databases (13)
- Artificial intelligence (13)