SSC CGL Computer – Number Systems & Data Representation (optional) – Level 1 · Warm-up

← Back

SSC CGL Computer – Number Systems & Data Representation (optional) – Level 1 · Warm-up – 12 questions, subject: Computer Knowledge. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

Get daily current affairs & exam alerts – follow us YouTube WhatsApp Channel Telegram Channel Facebook Page Instagram
Share with friends & study groups
Link to this page from your website / blog (HTML code)
1.  
The decimal value of (11011)₂ is:

Correct Answer: C [27]

Explanation:

Answer: 27. 16 + 8 + 0 + 2 + 1 = 27.

2.  
The binary form of 25 is:

Correct Answer: A [(11001)₂]

Explanation:

Answer: (11001)₂. Boxes 16 + 8 + 1 → 11001.

3.  
(25)₈ in decimal is:

Correct Answer: B [21]

Explanation:

Answer: 21. 2 × 8 + 5 = 21.

4.  
(2F)₁₆ in decimal is:

Correct Answer: D [47]

Explanation:

Answer: 47. 2 × 16 + 15 = 47.

5.  
The base of the hexadecimal number system is:

Correct Answer: A [16]

Explanation:

Hexa (6) + decimal (10) = 16 symbols.

6.  
One hexadecimal digit can be written using how many bits?

Correct Answer: D [4]

Explanation:

Answer: 4. 16 = 2⁴ → 4 bits.

7.  
Validity checkWhich of these is NOT a valid octal number?

Correct Answer: B [1289]

Explanation:

Octal digits are 0–7; 8 and 9 cannot appear.

8.  
The 1's complement of 10110 is:

Correct Answer: C [01001]

Explanation:

Flip every bit: 10110 → 01001.

9.  
One-line recallThe ASCII code of capital 'A' in decimal is:

Correct Answer: C [65]

Explanation:

ASCII anchors: A = 65, a = 97, '0' = 48.

10.  
A two-input AND gate gives output 1 when:

Correct Answer: D [both inputs are 1]

Explanation:

AND is strict: all inputs must be 1.

11.  
Fill in the blank(11111)₂ = ______ in decimal.

Correct Answer: A [31]

Explanation:

Answer: 31. Five ones = 2⁵ − 1 = 31.

12.  
Statement-basedWhich is/are correct?
I. (10)₁₆ = 16
II. (10)₈ = 10

Correct Answer: B [Only I]

Explanation:

(10)₁₆ = 16 ✓; (10)₈ = 8, not 10.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Computer Knowledge book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-computer-knowledge

📘 SSC CGL 2026 – Computer Knowledge (Tier II Paper I – Section III)
Here you get the answer with a one-line explanation. 672 original questions with answer key and explanations · notes, figures, shortcut keys and memory aids · practice sets + 3 Computer Knowledge mock tests
Get the book – ₹149 ₹299 →
Score: 0 Answered: 0 / 0