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Subjects
Class 10MathematicsReal NumbersProof of irrationality of √2, √3, √5HardLevel 17
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In the proof of (\sqrt{5}), which conclusion cannot be drawn immediately from (p^2=5q^2)?

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Answer and explanation

Correct answer: (q) is divisible by (5)

Step 1: From (p^2=5q^2), first (p^2), then (p), is proved divisible by (5). Step 2: Only after putting (p=5k) do we get (q^2=5k^2). Step 3: So divisibility of (q) is not immediate.

Related tags

Sqrt5 ProofImmediate ConclusionHardClass 10

Frequently asked questions

What is the correct answer to this question?

(q) is divisible by (5)

Why is this the correct answer?

Step 1: From (p^2=5q^2), first (p^2), then (p), is proved divisible by (5). Step 2: Only after putting (p=5k) do we get (q^2=5k^2). Step 3: So divisibility of (q) is not immediate.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Proof of irrationality of √2, √3, √5.

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10 more MCQs
  1. 1Which assumption is taken first to prove that (\sqrt{2}) is irrational?
  2. 2If (\sqrt{2}=\frac{p}{q}), what is obtained after squaring both sides?
  3. 3From the equation (p^2=2q^2), what do we learn about (p^2)?
  4. 4If (p^2) is even, which conclusion about (p) is correct?
  5. 5If (p) is even, in which form can (p) be written?
  6. 6What conclusion is obtained by putting (p=2k) in (p^2=2q^2)?
  7. 7What is the final contradiction in the proof of (\sqrt{2})?
  8. 8What is the correct final conclusion of the proof of (\sqrt{2})?
  9. 9If (\sqrt{3}) is assumed rational, in which form is it written?
  10. 10If (\sqrt{3}=\frac{p}{q}), which equation is obtained after squaring?
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