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NDA Binary Number System questions with solutions

Conversion and arithmetic in binary and other bases. 11 questions from our 2016–2025 NDA pattern papers, from the Class 11 Mathematics syllabus. Each has the answer and a full solution.

NDA 2025

The sum (1101)2+(1011)2 in binary isNDA 2025 Maths · medium

NDA 2023

The decimal equivalent of the binary number 1101101 isNDA 2023 Maths · easy
The binary representation of the decimal number 100 isNDA 2023 Maths · easy

NDA 2020

The sum (1011)2+(110)2 in the binary system isNDA 2020 Maths · easy
The decimal value of (1101.101)2 isNDA 2020 Maths · medium
How many digits equal to 1 occur in the binary representation of the decimal number 2023?NDA 2020 Maths · hard

NDA 2019

The decimal equivalent of the binary number (1010110)2 isNDA 2019 Maths · easy
The value of (10010)2-(111)2 in the binary system isNDA 2019 Maths · medium

NDA 2018

What is the product (1011)2×(101)2 in binary?NDA 2018 Maths · hard

NDA 2017

The binary representation of the decimal number 0.625 isNDA 2017 Maths · medium

NDA 2016

The sum of the binary numbers (1011)2 and (110)2 isNDA 2016 Maths · easy