A reservoir is 80 m × 60 m × 6.5 m. Time to fill at given rate is ____. A. 26 hours B. 42 hours C. 52 hours D. 65 hours Explanation: Volume ÷ rate.
Volume of cube is 1728 cc. Find surface area. A. 864 cm² B. 648 cm² C. 486 cm² D. 468 cm² Explanation: Side = 12 → TSA = 6×144.
Value of the plant depreciates 10% annually. Find the present value after 2 years, given the initial amount. A. Rs. 8000 B. Rs. 10000 C. Rs. 18000 D. Rs. 8100 Explanation: Value = P(0.9)².
Evaluate: 25.25 − 23.23 + 24.24 = ____. A. 26 B. 26.26 C. 2.2 D. −22.22 Explanation: Direct calculation.
True discount on Rs. 2562 due in 4 months is Rs. 122. Find rate. A. 12% B. 13% C. 15% D. 14% Explanation: Solve using the TD formula.
True discount on Rs. 1760 at 12% is Rs. 160. Find time. A. 6 months B. 8 months C. 9 months D. 10 months Explanation: Use TD relation.
True discount on a bill due 9 months later at 16% is Rs. 189. Find the bill value. A. Rs. 1386 B. Rs. 1764 C. Rs. 1575 D. Rs. 2268 Explanation: Apply the TD formula.
A student scores 60 in Maths and Physics. Chemistry is 20 marks more than Maths. Find the average marks. A. 40 B. 30 C. 25 D. Data inadequate Explanation: Total = 60 + 60 + 80 = 200 → avg = 40.
Total cost of flooring a room at Rs. 8.50 per m² is Rs. 510. Find the area. A. 7.5 m² B. 8.5 m² C. 10.5 m² D. 12.5 m² Explanation: Area = cost/rate = 510/8.5.
A tower of height 15 m makes an angle of elevation 60°. Find the distance from the base. A. 5 m B. 8 m C. 10 m D. 12 m Explanation: tan60 = h/d → d = 15/√3 = 10 m.