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Question Expert Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 15

यदि (r) परिमेय है और (s) अपरिमेय है तो (r+s=s) कब संभव है?

If (r) is rational and (s) is irrational then when is (r+s=s) possible?

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Correct Answer

A. जब (r=0)When (r=0)

Step 1

Concept

From (r+s=s), subtract (s) from both sides to get (r=0).

Step 2

Why this answer is correct

(0) is rational, so the condition is possible.

Step 3

Exam Tip

Form a simple equation before judging number types. चरण 1: (r+s=s) से दोनों ओर (s) घटाने पर (r=0) मिलता है। चरण 2: (0) परिमेय है इसलिए स्थिति संभव है। चरण 3: सरल समीकरण बनाकर संख्या के प्रकार की जांच करें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

कौन-सा विकल्प \(3-\sqrt{2}\) की प्रकृति सही बताता है?

Which option correctly describes the nature of \(3-\sqrt{2}\)?

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Correct Answer

B. अपरिमेय, क्योंकि परिमेय में से अपरिमेय घटा हैIrrational because an irrational is subtracted from a rational

Step 1

Concept

(3) is rational and \(\sqrt{2}\) is irrational.

Step 2

Why this answer is correct

A rational number minus an irrational number remains irrational.

Step 3

Exam Tip

Do not classify the whole expression by looking only at the rational part. चरण 1: (3) परिमेय है और \(\sqrt{2}\) अपरिमेय है। चरण 2: परिमेय संख्या में से अपरिमेय घटाने पर परिणाम अपरिमेय रहता है। चरण 3: केवल परिमेय पद देखकर पूरे व्यंजक को परिमेय न मानें।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि \(x=\frac{2}{\sqrt{5}}\), तो (x) की प्रकृति क्या है?

If \(x=\frac{2}{\sqrt{5}}\), what is the nature of (x)?

Explanation opens after your attempt
Correct Answer

B. अपरिमेयIrrational

Step 1

Concept

The denominator has \(\sqrt{5}\), which is irrational.

Step 2

Why this answer is correct

Rationalizing gives \(x=\frac{2\sqrt{5}}{5}\), a non-zero rational multiple of an irrational number.

Step 3

Exam Tip

Rationalizing the denominator often reveals the number type clearly. चरण 1: हर में \(\sqrt{5}\) है, जो अपरिमेय है। चरण 2: हर को परिमेय बनाने पर \(x=\frac{2\sqrt{5}}{5}\) मिलेगा, जो अशून्य परिमेय गुणक के साथ अपरिमेय है। चरण 3: हर परिमेय बनाने से संख्या की प्रकृति साफ दिखती है।

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Question Hard Mathematics Chapter 1: Real Numbers 5: Irrational numbers Class 10 Level 14

यदि (x) एक अपरिमेय संख्या है, तो (-x) के बारे में सही कथन क्या है?

If (x) is an irrational number, which statement about (-x) is correct?

Explanation opens after your attempt
Correct Answer

B. यह हमेशा अपरिमेय हैIt is always irrational

Step 1

Concept

A negative sign changes direction, not rationality.

Step 2

Why this answer is correct

If (-x) were rational, then (x) would also be rational, which is false.

Step 3

Exam Tip

Treat the sign of a number and its type separately. चरण 1: ऋण चिह्न केवल संख्या की दिशा बदलता है, उसकी परिमेयता नहीं। चरण 2: यदि (-x) परिमेय हो, तो (x) भी परिमेय होगा, जो गलत है। चरण 3: संख्या के चिह्न और संख्या की प्रकृति को अलग-अलग समझें।

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