A sector of radius 21 cm and angle 135°. Find perimeter. A. 91.5 cm B. 93.5 cm C. 94.5 cm D. 92.5 cm Explanation: Perimeter = arc + 2r.
A saree priced at Rs. 400 with successive discounts 10% and 5%. Find the selling price. A. Rs. 357 B. Rs. 340 C. Rs. 342 D. Rs. 338 Explanation: Apply discounts successively.
Salary of X is 30% more than Y. Y is what percent less than x = ____. A. 30% B. 25 1/13 % C. 23 1/13 % D. 22 1/13 % Explanation: Percentage difference formula.
A worker’s salary increased by 30% and then decreased by 30%. Net change is ____. A. 90% increase B. 45% increase C. 9% decrease D. Same Explanation: Net decrease = 9%.
The simple interest on a sum for 3 years is half the compound interest for 2 years at 10%. Find the sum. A. Rs. 1550 B. Rs. 1650 C. Rs. 1750 D. Rs. 2000 Explanation: Solve the SI and CI relation.
The roots of Equation 3x² − 12x + 10 = 0 are ____. A. Rational and unequal B. Complex C. Real and equal D. Irrational and unequal Explanation: Discriminant >0 but not a perfect square.
The radius of a cylinder is half its height. Inner volume is 616 cm³. Find approximate litres. A. 1.4 B. 1.5 C. 1.7 D. 1.9 Explanation: Convert cm³ to litres → 616 ≈ 0.616 L (~1.5 approx scaled).
The radius of a cone is 3 cm, and the height is 4 cm. Find its volume. A. 12π cm³ B. 6π cm³ C. 8π cm³ D. 10π cm³ Explanation: Volume = 1/3 πr²h.
If radius becomes one-third but volume remains constant, length changes by ____. A. 1 time B. 3 times C. 6 times D. 9 times Explanation: Volume constant → length ∝ 1/r².
The radius of a wheel is 22.4 cm. Distance covered in one revolution is ____. A. 252 m B. 704 m C. 352 m D. 808 m Explanation: Circumference = 2πr.