Identify the correct statements.
A. 3 successive discounts of 20%, 25% and 20% are equivalent to a single discount of 65%.
B. The value of ∛743 × √196 is equal to 98
C. A movement of 180° by minute hand results in 30° movement of hour hand
D. The total surface area of a solid cube of side 5 cm is 150 cm²
Choose the correct answer from the options given below:सही कथनों की पहचान कीजिए।
A. 20%, 25% और 20% की 3 क्रमिक छूटें मिलकर 65% की एकल छूट के बराबर होती हैं।
B. ∛743 × √196 का मान 98 के बराबर है
C. मिनट की सुई द्वारा 180° का घूर्णन, घंटे की सुई के 30° के घूर्णन में परिणत होता है
D. 5 सेमी भुजा वाले ठोस घन का कुल पृष्ठ क्षेत्रफल 150 सेमी² है
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Correct answer: D. B and D Onlyकेवल B और D
Explanation
A is wrong: 0.80 × 0.75 × 0.80 = 0.48, so the single equivalent discount is 52%, not 65%. C is wrong: the minute hand turning 180° means 30 minutes, in which the hour hand turns 30 × 0.5° = 15°, not 30°. D is correct: 6 × 5² = 150 cm². B is correct only if the cube root is of 343 (∛343 × √196 = 7 × 14 = 98); as printed (743) its value is about 126.7. Taking B and D as the true statements, the answer is B and D only. NTA dropped this question.A गलत है: 0.80 × 0.75 × 0.80 = 0.48, अतः एकल समतुल्य छूट 52% है, 65% नहीं। C गलत है: मिनट की सुई का 180° घूमना अर्थात् 30 मिनट, जिसमें घंटे की सुई 30 × 0.5° = 15° घूमती है, 30° नहीं। D सही है: 6 × 5² = 150 सेमी²। B तभी सही है जब घनमूल 343 का हो (∛343 × √196 = 7 × 14 = 98); जैसा छपा है (743) उसका मान लगभग 126.7 है। B और D को सही कथन मानने पर उत्तर केवल B और D है। NTA ने इस प्रश्न को हटा (drop कर) दिया था।More Mathematical Reasoning and Aptitude questions
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