If cost price is Rs. 750 and selling price is Rs. 900, profit percent is ____. A. 15% B. 18% C. 20% D. 25% Explanation: Profit = 150 → 150/750 ×100 = 20%.
If a person covers 150 km in 3 hours, his speed is ____. A. 40 km/h B. 45 km/h C. 50 km/h D. 55 km/h Explanation: Speed = 150/3 = 50 km/h.
If a train runs at 54 km/h, how many meters per second is its speed? A. 10 B. 12 C. 15 D. 18 Explanation: 54 × 5/18 = 15 m/s.
If a number is increased by 50% and becomes 75, the original number is ____. A. 40 B. 45 C. 50 D. 60 Explanation: x × 1.5 = 75 → x = 50.
If one number is 25% less than another, the ratio is ____. A. 3:4 B. 4:3 C. 2:3 D. 5:4 Explanation: Reduced value = 75% → ratio = 3:4.
If one number is 20% more than another, the ratio between them is ____. A. 5:6 B. 6:5 C. 4:5 D. 5:4 Explanation: Let smaller = 5 → larger = 6.
The sum of cubes of first 5 natural numbers is ____. A. 100 B. 225 C. 125 D. 150 Explanation: (n(n+1)/2)² = 225.
If the radius of a circle is halved, area becomes ____. A. Half B. One-fourth C. Same D. Double Explanation: Area ∝ r² → becomes 1/4.
If the radius of a circle is doubled, area becomes ____. A. Double B. Four times C. Same D. Half Explanation: Area ∝ r² → becomes 4 times.
If the area of a square is 144 sq cm, side is ____. A. 10 cm B. 12 cm C. 14 cm D. 16 cm Explanation: Side = √144 = 12.