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Subjects
Class 10MathematicsReal NumbersProof of irrationality of √2, √3, √5HardLevel 16
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In the proof of (\sqrt{5}), (q) is divisible by (5) from (q^2=5k^2). Which condition is necessary for this conclusion?

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Answer and explanation

Correct answer: (5) is prime

Step 1: From (q^2=5k^2), (q^2) is divisible by (5). Step 2: To conclude divisibility of the original number from the square, (5) must be prime. Step 3: Therefore (q) is said to be divisible by (5).

Related tags

Sqrt5 ProofPrime ConditionHardClass 10

Frequently asked questions

What is the correct answer to this question?

(5) is prime

Why is this the correct answer?

Step 1: From (q^2=5k^2), (q^2) is divisible by (5). Step 2: To conclude divisibility of the original number from the square, (5) must be prime. Step 3: Therefore (q) is said to be divisible by (5).

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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