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Math (Computer) Solved Questions & Notes (2026) - Apex Rankers

General Competitive Exams > Computer > Math

16 Total Solved Questions
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16 Questions in this set
Select the best option for the following General Computer and Number System questions (filling the gap between PowerPoint batches):
Q. 1 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The base of decimal number system is:
A
10
✓ Correct
B
2
C
8
D
16
💡 Step-by-Step Explanation & Concept Rationale
The decimal system is base-10, using digits 0 through 9.
Q. 2 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The base of binary number system is:
A
16
B
2
✓ Correct
C
8
D
10
💡 Step-by-Step Explanation & Concept Rationale
The binary system is base-2, using only the digits 0 and 1.
Q. 3 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The base of octal number system is:
A
10
B
2
C
8
✓ Correct
D
16
💡 Step-by-Step Explanation & Concept Rationale
The octal system is base-8, using digits 0 through 7.
Q. 4 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The base of hexadecimal number system is:
A
16
✓ Correct
B
2
C
8
D
10
💡 Step-by-Step Explanation & Concept Rationale
Hexadecimal is base-16, using 0–9 and letters A–F.
Q. 5 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The number of digits in octal system:
A
8
✓ Correct
B
7
C
10
D
16
💡 Step-by-Step Explanation & Concept Rationale
There are eight distinct digits (0–7) in the octal numbering system.
Q. 6 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The number of digits in decimal system is:
A
8
B
7
C
10
✓ Correct
D
16
💡 Step-by-Step Explanation & Concept Rationale
The decimal system contains ten unique digits from zero to nine.
Q. 7 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The number of digits in Hexadecimal system is:
A
15
B
17
C
16
✓ Correct
D
8
💡 Step-by-Step Explanation & Concept Rationale
Hexadecimal uses sixteen symbols: 0–9 followed by A–F.
Q. 8 Computer Aptitude Test
Difficulty: Medium (1 Mark)
Hexadecimal 'F' is equivalent to _______ in decimal:
A
16
B
15
✓ Correct
C
17
D
8
💡 Step-by-Step Explanation & Concept Rationale
In hex, A=10, B=11, C=12, D=13, E=14, and F=15.
Q. 9 Computer Aptitude Test
Difficulty: Medium (1 Mark)
In hexadecimal number system, A is equal to decimal:
A
10
✓ Correct
B
11
C
17
D
18
💡 Step-by-Step Explanation & Concept Rationale
The letter 'A' represents the tenth value (decimal 10) in base-16.
Q. 10 Computer Aptitude Test
Difficulty: Medium (1 Mark)
In hexadecimal number system, B is equal to decimal:
A
10
B
11
✓ Correct
C
17
D
8
💡 Step-by-Step Explanation & Concept Rationale
The letter 'B' represents the eleventh value in the hexadecimal system.
Q. 11 Computer Aptitude Test
Difficulty: Medium (1 Mark)
In hexadecimal number system, C is equal to decimal:
A
10
B
11
C
12
✓ Correct
D
8
💡 Step-by-Step Explanation & Concept Rationale
'C' corresponds to the decimal value 12 in base-16 logic.
Q. 12 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is the decimal value of 2³?
A
2
B
4
C
6
D
8
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
2 to the power of 3 is 2 × 2 × 2, which equals 8.
Q. 13 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is the decimal value of 2⁻¹ is equal to:
A
0.5
✓ Correct
B
0.25
C
0.05
D
0.1
💡 Step-by-Step Explanation & Concept Rationale
A negative exponent indicates a reciprocal; 2⁻¹ is 1/2, or 0.5.
Q. 14 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The decimal number 18 is equal to the binary number:
A
11110
B
10001
C
10010
✓ Correct
D
1111000
💡 Step-by-Step Explanation & Concept Rationale
18 in binary is 16 + 2, represented as 10010.
Q. 15 Computer Aptitude Test
Difficulty: Medium (1 Mark)
The difference of 111 - 001 equals:
A
100
B
111
C
True
D
110
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
In binary subtraction, 7 (111) minus 1 (001) equals 6 (110).
Q. 16 Computer Aptitude Test
Difficulty: Medium (1 Mark)
Binary multiplication 1 * 0 =
A
True
B
False
C
10
✓ Correct
D
11
💡 Step-by-Step Explanation & Concept Rationale
Like decimal math, any binary digit multiplied by zero results in zero.
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