Govt Exams
Advertisement
Topics in Placement Papers
A number increased by 25% becomes 500. What is the original number?
Correct Answer:
A. 400
EXPLANATION
Let original number = x. x × 1.25 = 500. x = 500/1.25 = 400
A mixture contains milk and water in the ratio 5:3. If the total quantity is 80 liters, how much milk is there?
Correct Answer:
B. 50 liters
EXPLANATION
Milk:Water = 5:3, Total parts = 8. Milk = 5/8 × 80 = 50 liters
A person walks 6 km North, then 8 km East. What is the shortest distance from the starting point?
Correct Answer:
A. 10 km
EXPLANATION
Using Pythagorean theorem: Distance = √(6² + 8²) = √(36 + 64) = √100 = 10 km
What is the average of first 20 natural numbers?
Correct Answer:
B. 10.5
EXPLANATION
Sum of first n natural numbers = n(n+1)/2. Sum = 20×21/2 = 210. Average = 210/20 = 10.5
If the compound interest on Rs. 10,000 at 10% per annum for 2 years is compound annually, what is the amount?
Correct Answer:
A. Rs. 12,100
EXPLANATION
Amount = P(1 + R/100)^n = 10000(1 + 10/100)^2 = 10000(1.1)^2 = 10000 × 1.21 = Rs. 12,100
A man bought a car for Rs. 5,00,000 and sold it at a loss of 15%. What is the selling price?
Correct Answer:
A. Rs. 4,25,000
EXPLANATION
Selling Price = Cost Price × (1 - Loss%). SP = 500000 × (1 - 0.15) = 500000 × 0.85 = Rs. 4,25,000
A train travels 300 km in 5 hours. If it increases its speed by 20%, how long will it take to cover 360 km?
Correct Answer:
B. 5 hours
EXPLANATION
Original speed = 300/5 = 60 km/h. New speed = 60 × 1.2 = 72 km/h. Time = 360/72 = 5 hours
What is the missing number in this sequence: 5, 10, 20, 40, ?
Correct Answer:
D. 80
EXPLANATION
Each number is multiplied by 2. 5×2=10, 10×2=20, 20×2=40, 40×2=80
What is 15% of 200?
Correct Answer:
C. 30
EXPLANATION
15% of 200 = (15/100) × 200 = 0.15 × 200 = 30
If a square has a side of 5 cm, what is its area?
Correct Answer:
C. 25 cm²
EXPLANATION
Area of square = side² = 5² = 25 cm²