A train travels 120 km in 2 hours and then 180 km in 3 hours. What is the average speed of the train for the entire journey?
Total distance = 120 + 180 = 300 km. Total time = 2 + 3 = 5 hours. Average speed = 5300 = 60 km/h
If 15% of x is 45, what is 25% of x?
15% of x = 45, so x = 045.15 = 300. Then 25% of 300 = 0.25 × 300 = 75
A shopkeeper buys an item for Rs. 800 and sells it at a profit of 20%. What is the selling price?
Selling Price = Cost Price + Profit = 800 + (20% of 800) = 800 + 160 = 960
A man invests Rs. 5000 at 8% per annum simple interest. How much will be his total amount after 3 years?
Simple Interest = (P × R × T)/100 = (5000 × 8 × 3)/100 = 1200. Total = 5000 + 1200 = 6200
In a class of 60 students, 35% are girls. How many boys are there?
Girls = 35% of 60 = 21. Boys = 60 - 21 = 39
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The ratio of ages of A and B is 5:3. If A is 20 years old, how old is B?
A:B = 5:3. If A = 20, then 5x = 20, so x = 4. B = 3x = 3(4) = 12 years
A box contains 3 red balls, 4 blue balls, and 5 green balls. What is the probability of drawing a red ball?
Total balls = 3 + 4 + 5 = 12. P(red) = 123 = 41
If the cost price is Rs. 500 and profit percentage is 25%, what is the profit amount?
Profit = 25% of 500 = 0.25 × 500 = 125
A worker can complete a task in 10 days. How much work will be done in 3 days?
Work done per day = 101 = 10%. In 3 days = 3 × 10% = 30%
If a < b and b < c, which of the following is true?
By transitivity, if a < b and b < c, then a < c
The average of five numbers is 30. What is their sum?
Sum = Average × Count = 30 × 5 = 150
Find the missing number in the series: 2, 4, 8, 16, ?, 64
Each number is double the previous: 2, 4, 8, 16, 32, 64. Pattern is multiplication by 2
Complete the analogy: Dog : Bark :: Cat : ?
A dog barks, similarly a cat meows. This is a sound association analogy
Find the odd one out: 12, 24, 36, 48, 58
12, 24, 36, 48 are all multiples of 12. 58 is not a multiple of 12
Which data structure uses LIFO (Last In First Out)?
Stack follows LIFO principle. Queue follows FIFO. Array and Tree are not strictly LIFO/FIFO structures
In OOP, what is inheritance?
Inheritance allows a class to inherit properties and methods from another class (parent/base class)
What does REST API stand for?
REST stands for Representational State Transfer, an architectural style for web services
In a relational database, a Primary Key must be:
A Primary Key uniquely identifies each record and cannot contain null values
Which of the following is an advantage of Cloud Computing?
Cloud computing provides scalability, flexibility, and pay-as-you-go pricing models
A password must contain at least one uppercase letter, one digit, and be at least 8 characters long. Which is valid?
ABC12345 has uppercase (A,B,C), digit (1,2,3,4,5), and is 8+ characters long
