Practice Question Bankmedium Level
ID: 69386b3bb573ee20fadcca71
QUESTION STATEMENT:द्विभाषी / Bilingual
यदि एक गोले की त्रिज्या 10 प्रतिशत कम कर दी जाए, तब गोले का आयतन कितने प्रतिशत कम हो जाएगा?
If the radius of a sphere is decreased by 10 percent, then by what percent will the volume of the sphere decrease?
SELECT CORRECT OPTION:
A
27.1 प्रतिशत
27.1 percent
Correct
B
32.1 प्रतिशत
32.1 percent
C
30 प्रतिशत
30 percent
D
26.1 प्रतिशत
26.1 percent
Official Solution & Explanation:
Correct Answer: Option A(27.1 प्रतिशत)
गोले का आयतन त्रिज्या के घन ($r^3$) के समानुपाती होता है। यदि नई त्रिज्या $0.9r$ है, तो नया आयतन $(0.9)^3 = 0.729$ होगा। आयतन में कमी = $1 - 0.729 = 0.271$ या $27.1\%$।
Volume is proportional to the cube of radius ($r^3$). If new radius = $0.9r$, new volume = $(0.9)^3 = 0.729$. Decrease = $1 - 0.729 = 0.271$ or $27.1\%$.

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