Worksheets › Class 9 › Binary, Data and Logic
Class 9 · Computational Thinking and AI worksheetBinary, Data and Logic
CBSE Computational Thinking and AI. Binary numbers, bits, bytes and KB, image and text sizes, ASCII codes, AND, OR and NOT, truth tables. Every sheet has 20 questions in three sections and an answer key, and the questions change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
A bit is:
- a letter
- 1,024 bytes
- 8 binary digits
- a single binary digit, 0 or 1
Answer
(d) a single binary digit, 0 or 1
- 2.
What is the binary number 11110011 in decimal?
- 243
- 207
- 242
- 244
Answer
(a) 243
128 + 64 + 32 + 16 + 2 + 1
- 3.
What is 217 in binary?
- 11011000
- 10011011
- 11011001
- 111011001
Answer
(c) 11011001
repeated division by 2, remainders read upwards
Section B · short answer
- 4.
Why do computers use binary?
Answer
Their circuits have two states (on/off), which match the digits 1 and 0.
- 5.
Write 236 in binary.
Answer
11101100
128 + 64 + 32 + 8 + 4
Section C · long answer
- 6.
Explain how numbers, text and images are all stored as binary in a computer.
Answer
Numbers are written in base 2; each character gets a code (A = 65) stored in binary; an image is a grid of pixels, each colour stored as a binary number.
Fresh sheets for your child
In the app, every Binary, Data and Logic sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.