Class 9 Mathematics - Number Systems - Decimal representation Expert Quiz

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एक विद्यार्थी कहता है कि \(\sqrt{3}\) अपरिमेय है क्योंकि इसका दशमलव प्रसार \(1.732\ldots\) अनंत तक चलता है। उसके तर्क में मुख्य त्रुटि क्या है?

A student says that \(\sqrt{3}\) is irrational because its decimal expansion \(1.732\ldots\) continues endlessly. What is the main error in this argument?

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Correct Answer

A. अनंत दशमलव प्रसार वाला प्रत्येक संख्या अपरिमेय नहीं होता; वह आवर्ती भी हो सकता है।Not every non-terminating decimal is irrational; it may be recurring.

Explanation

Simple Explanation

केवल अनंत दशमलव प्रसार से अपरिमेयता सिद्ध नहीं होती, क्योंकि \(\frac{1}{3}=0.333\ldots\) अनंत होते हुए भी परिमेय है। अपरिमेय दशमलव अनंत और अनावर्ती होता है। परीक्षा में आवर्ती तथा अनावर्ती प्रसार का अंतर याद रखें। / A non-terminating decimal alone does not prove irrationality: \(\frac{1}{3}=0.333\ldots\) goes on forever but is rational. An irrational number has a non-terminating, non-recurring decimal expansion. Exam tip: distinguish recurring from non-recurring decimals.

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रीमा कहती है, “\(\sqrt{3}=1.732\), इसलिए \(\sqrt{3}\) परिमेय है।” उसके तर्क की मुख्य त्रुटि क्या है?

Rima says, “\(\sqrt{3}=1.732\); therefore, \(\sqrt{3}\) is rational.” What is the main error in her reasoning?

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Correct Answer

A. उसने सन्निकट मान को ठीक मान मान लिया हैShe has treated an approximation as an exact value.

Explanation

Simple Explanation

\(1.732\), \(\sqrt{3}\) का केवल सन्निकट मान है, ठीक मान नहीं; क्योंकि \(1.732^2=2.999824\), जो 3 नहीं है। 3 पूर्ण वर्ग नहीं है, इसलिए \(\sqrt{3}\) अपरिमेय है। परीक्षा टिप: \(=\) और \(\approx\) का अंतर अवश्य पहचानें। / \(1.732\) is only an approximation of \(\sqrt{3}\), not its exact value, since \(1.732^2=2.999824\), not 3. As 3 is not a perfect square, \(\sqrt{3}\) is irrational. Exam tip: always distinguish \(=\) from \(\approx\).

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एक विद्यार्थी कहता है कि \(\sqrt{3}\) परिमेय है, क्योंकि उसका दशमलव रूप 1.732 है और \(1.732=\frac{1732}{1000}\) है। उसके तर्क में त्रुटि क्या है?

A student claims that \(\sqrt{3}\) is rational because its decimal form is 1.732 and \(1.732=\frac{1732}{1000}\). What is the error in the student’s reasoning?

Explanation opens after your attempt
Correct Answer

A. 1.732 केवल \(\sqrt{3}\) का सन्निकट मान है, उसका सटीक मान नहीं है।1.732 is only an approximation of \(\sqrt{3}\), not its exact value.

Explanation

Simple Explanation

1.732 एक सीमित दशमलव सन्निकटन है। वास्तव में \(1.732^2=2.999824\), जो 3 नहीं है। इसलिए \(\frac{1732}{1000}\) परिमेय है, पर वह \(\sqrt{3}\) नहीं है। परीक्षा में सन्निकट और सटीक मान में अंतर रखें। / 1.732 is a terminating decimal approximation. In fact, \(1.732^2=2.999824\), not 3. Thus \(\frac{1732}{1000}\) is rational, but it is not equal to \(\sqrt{3}\). Exam tip: distinguish an approximate decimal from an exact value.

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