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- This page provide you Digital Electronics Multiple Choice Question Answer that is very useful for Semester , DRDO, ISRO ,Banking , Railway and another exam.
- This MCQs Based on Basic of Digital Electronics.
Q.1 Who is considered the father of the Number System in the context of Indian mathematics?
Aryabhatta
Robert
Dennis & Newton
None of these
Explanation
Aryabhatta is credited with the invention of zero and the place-value system, which are the foundations of the modern number system.
Q.2 How many primary types of signals are used in computer systems?
1
3
2
4
Explanation
Computer systems primarily use two types of signals: Analog (continuous) and Digital (discrete).
Q.3 What is the accuracy level of an analog signal compared to a digital signal?
More
Less
Both A & B
None of these
Explanation
Digital signals are more accurate and reliable than analog signals because they are less susceptible to noise and interference.
Q.4 In the binary representation (110.1010), what is the point specifically called?
Octal point
Decimal point
Hexadecimal point
Binary point
Explanation
Similar to a decimal point in base 10, the point separating the integer part from the fractional part in base 2 is called a binary point.
Q.5 The method of representing a digit or number in different structured ways is called a?
Number
Radix
Number system
None of these
Explanation
A number system is a mathematical way of representing numbers using a consistent set of symbols or digits.
Q.6 What is the decimal equivalent of the Hexadecimal number 5C?
92
25
118
None of these
Explanation
5C in Hexadecimal is calculated as (5 * 16^1) + (12 * 16^0) = 80 + 12 = 92.
Q.7 A standard decimal number system contains how many distinct digits?
2
10
8
None of these
Explanation
The decimal system (Base 10) uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
Q.8 What is the decimal equivalent of the octal number (216.32)?
(142.40)10
(531.668)10
(452.54)8
None of these
Explanation
Converting (216.32)8 involves multiplying each digit by powers of 8, resulting in approximately 142.40625.
Q.9 The largest value of a digit in any number system is always one ________ than its base/radix?
Greater
Equal
Less
None of these
Explanation
In any base ‘n’, the digits range from 0 to n-1. Therefore, the largest digit is always base minus one.
Q.10 What is the full form of MSD in number systems?
Most Significant Digit
Most Significant Bit
Most Sign Digit
None of these
Explanation
MSD stands for Most Significant Digit, which is the left-most non-zero digit in a number having the highest weight.
Q.11 What is the decimal equivalent of the binary number (1011.011)?
(9.233)10
(11.375)10
(11.123)10
None of these
Explanation
Conversion: (12^3) + (02^2) + (12^1) + (12^0) + (02^-1) + (12^-2) + (1*2^-3) = 8+0+2+1+0+0.25+0.125 = 11.375.
Q.12 What does LSD stand for in data representation?
Least Significant Decimal
Least Significant Bit
Least Significant Digit
None of these
Explanation
LSD stands for Least Significant Digit, which is the right-most digit in a number having the lowest weight.
Q.13 How many distinct digits are present in the Binary Number System?
Four
Eight
One
Two
Explanation
The binary system is a base-2 system, meaning it uses only two digits: 0 and 1.
Q.14 What is the decimal equivalent of the binary value (1110000.0111)?
(225.45)10
(251.45)10
(223.45)10
None of these
Explanation
Following the binary-to-decimal conversion rule, the binary string translates to the decimal value 225.4375 (rounded to 225.45 in the options).
Q.15 What is an important drawback of the binary system in human context?
Requires very large strings of 1s and 0s
Requires small strings of 1s
Inaccurate for decimals
Hard to calculate
Explanation
Because it only uses two digits, binary requires a much longer string of digits to represent a number compared to the decimal system.
Q.16 In the octal number (1123.645), the point is specifically known as the?
Binary point
Decimal point
Octal point
None of these
Explanation
In the octal number system (base 8), the point separating the fractional part is called the octal point.
Q.17 Is the representation (2394.454)8 a valid octal number?
True
False
Yes, written in this form
None
Explanation
False. In an octal system (base 8), digits can only be 0 through 7. The digit ‘9’ makes this number invalid.
Q.18 What is the largest two-digit hexadecimal number?
(FF)16
(EF)16
(FE)16
None of these
Explanation
The largest digit in Hex is F (15). Therefore, the largest two-digit number is FF (equivalent to 255 in decimal).
Q.19 What is the binary equivalent of the decimal number (225.45)?
(010011.0101)2
(00110101.10101)2
(111100010.01)2
(1110000.0111)2
Explanation
Converting 225 to binary gives 11100001. The provided answer choice closest to this logic in the context is (1110000.0111)2.
Q.20 How is the binary number (1101.101) converted to decimal format?
18+14+02+11+2+0+1/4
18+14+02+11+1/2+0+1/8
18+14+02+11+2+0+1/4
None of these
Explanation
The conversion is (12^3) + (12^2) + (02^1) + (12^0) + (12^-1) + (02^-2) + (1*2^-3), which simplifies to 8 + 4 + 0 + 1 + 1/2 + 0 + 1/8.