What is Cybersecurity?
Cybersecurity is the practice of protecting computer systems and networks from digital attacks, malware, and unauthorized access.
What is an 'Interface' in OOP?
An interface is an abstract type that defines a set of methods that implementing classes must provide.
What does JSON stand for?
JSON stands for JavaScript Object Notation, a lightweight data format for data exchange.
What is the function of a 'Router' in networking?
A router is a networking device that directs data packets between different networks based on IP addresses.
What is Machine Learning?
Machine Learning is a subset of AI that enables systems to learn from data and improve performance without explicit programming.
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What is the purpose of Unit Testing?
Unit testing involves testing individual units or components of code in isolation to ensure they work correctly.
A train travels 120 km in 2 hours and then 150 km in 3 hours. What is the average speed of the train?
Total distance = 120 + 150 = 270 km. Total time = 2 + 3 = 5 hours. Average speed = 5270 = 54 km/h
If a number is divisible by both 12 and 18, it must be divisible by:
LCM of 12 and 18 = 36. Any number divisible by both 12 and 18 must be divisible by their LCM, which is 36
What is the compound interest on Rs. 10,000 at 10% per annum for 2 years?
CI = P[(1 + r/100)^n - 1] = 10000[(1.1)^2 - 1] = 10000[0.21] = Rs. 2,100
If 5 workers can complete a job in 12 days, how many days will 8 workers take?
Work = 5 × 12 = 60 worker-days. Days for 8 workers = 860 = 7.5 days
A shopkeeper buys an item at Rs. 400 and sells it at Rs. 520. What is his profit percentage?
Profit = 520 - 400 = 120. Profit% = (400120) × 100 = 30%
What is the missing number in the series: 2, 6, 12, 20, ?, 42
Series follows n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42
If a:b = 3:4 and b:c = 5:6, then a:b:c is:
a:b = 3:4, b:c = 5:6. Multiply first by 5 and second by 4: a:b = 15:20, b:c = 20:24. So a:b:c = 15:20:24
In a class of 50 students, 30 study Math and 25 study Science. How many study both?
Using set theory: n(M∪S) = n(M) + n(S) - n(M∩S). 50 = 30 + 25 - n(M∩S). n(M∩S) = 5
What is the value of (2.5)² - (1.5)² / 2?
(2.5)² - (1.5)² / 2 = [6.25 - 2.25] / 2 = 24 = 2
If x² + 1/x² = 7, then x + 1/x is:
(x + 1/x)² = x² + 2 + 1/x² = 7 + 2 = 9. So x + 1/x = ±3
Which number is NOT a perfect square?
144=12², 169=13², 196=14², but 195 is not a perfect square (√195 ≈ 13.96)
Find the next number in the sequence: 1, 1, 2, 3, 5, 8, ?
This is the Fibonacci sequence where each number is the sum of the previous two: 5+8=13
If 30% of x is 45, then x is:
0.30 × x = 45. x = 045.30 = 150
A man walks 5 km north, then 3 km east, then 5 km south. How far is he from his starting point?
After north and south movements (cancel out), he is only 3 km east of starting point
