Concept-wise Practice

multiplication MCQ Questions for Class 10

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Practice Questions

37 questions tagged with multiplication.

कौन सा विकल्प दो अपरिमेय संख्याओं का गुणनफल अपरिमेय बनने का उदाहरण है?

Which option is an example where the product of two irrational numbers is irrational?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{2}\times\sqrt{5}\)

Step 1

Concept

\(\sqrt{2}\times\sqrt{5}=\sqrt{10}\), which is irrational. Multiplying equal roots can often give a rational number.

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{2}\times\sqrt{5}\). \(\sqrt{2}\times\sqrt{5}=\sqrt{10}\), which is irrational. Multiplying equal roots can often give a rational number.

Step 3

Exam Tip

\(\sqrt{2}\times\sqrt{5}=\sqrt{10}\) है जो अपरिमेय है। समान जड़ों का गुणन अक्सर परिमेय दे सकता है।

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कौन सा विकल्प अपरिमेय संख्या को शून्य से गुणा करने का परिणाम दिखाता है?

Which option shows the result of multiplying an irrational number by zero?

Explanation opens after your attempt
Correct Answer

A. (0) जो परिमेय है(0) which is rational

Step 1

Concept

Multiplying any real number by (0) gives (0). (0) is a rational number.

Step 2

Why this answer is correct

The correct answer is A. (0) जो परिमेय है / (0) which is rational. Multiplying any real number by (0) gives (0). (0) is a rational number.

Step 3

Exam Tip

किसी भी वास्तविक संख्या को (0) से गुणा करने पर (0) मिलता है। (0) परिमेय संख्या है।

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\(\sqrt{3}\times\sqrt{27}\) का मान क्या है?

What is the value of \(\sqrt{3}\times\sqrt{27}\)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

\(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\). The product of two irrational numbers can be rational.

Step 2

Why this answer is correct

The correct answer is A. (9). \(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\). The product of two irrational numbers can be rational.

Step 3

Exam Tip

\(\sqrt{3}\times\sqrt{27}=\sqrt{81}=9\) है। दो अपरिमेय संख्याओं का गुणनफल परिमेय भी हो सकता है।

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दो अपरिमेय संख्याओं का गुणनफल हमेशा कैसा होता है?

What is the product of two irrational numbers always?

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Correct Answer

A. हमेशा निश्चित नहींNot always fixed

Step 1

Concept

\(\sqrt{2}\times\sqrt{2}=2\) is rational but \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) is irrational. So it is not always one type.

Step 2

Why this answer is correct

The correct answer is A. हमेशा निश्चित नहीं / Not always fixed. \(\sqrt{2}\times\sqrt{2}=2\) is rational but \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) is irrational. So it is not always one type.

Step 3

Exam Tip

\(\sqrt{2}\times\sqrt{2}=2\) परिमेय है लेकिन \(\sqrt{2}\times\sqrt{3}=\sqrt{6}\) अपरिमेय है। इसलिए हमेशा एक जैसा नहीं होता।

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\(3\sqrt{5}\) किस प्रकार की संख्या है?

What type of number is \(3\sqrt{5}\)?

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Correct Answer

A. अपरिमेय संख्याIrrational number

Step 1

Concept

Multiplying an irrational by a non zero rational gives an irrational result. Here \(3\neq0\).

Step 2

Why this answer is correct

The correct answer is A. अपरिमेय संख्या / Irrational number. Multiplying an irrational by a non zero rational gives an irrational result. Here \(3\neq0\).

Step 3

Exam Tip

गैर शून्य परिमेय संख्या से अपरिमेय को गुणा करने पर परिणाम अपरिमेय होता है। यहाँ \(3\neq0\) है।

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वह सबसे छोटी संख्या क्या है जिससे \(2^5\times3^2\times7\) को गुणा करने पर पूर्ण घन बनेगा?

What is the smallest number by which \(2^5\times3^2\times7\) should be multiplied to make it a perfect cube?

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Correct Answer

A. \(2\times3\times7^2\)

Step 1

Concept

In a perfect cube, every prime exponent must be a multiple of (3).

Step 2

Why this answer is correct

\(2^5\) needs one more (2), \(3^2\) needs one more (3), and \(7^1\) needs \(7^2\).

Step 3

Exam Tip

Complete each exponent to the next multiple of (3). चरण 1: पूर्ण घन में हर अभाज्य गुणनखंड की घात (3) की गुणज होनी चाहिए। चरण 2: \(2^5\) को \(2^6\) बनाने के लिए (2), \(3^2\) को \(3^3\) बनाने के लिए (3), और \(7^1\) को \(7^3\) बनाने के लिए \(7^2\) चाहिए। चरण 3: घातों को अगली (3) की गुणज तक पूरा करें।

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यदि (a) को (4) से भाग देने पर शेषफल (3) है, तो (2a) को (4) से भाग देने पर शेषफल क्या होगा?

If (a) leaves remainder (3) when divided by (4), what is the remainder when (2a) is divided by (4)?

Explanation opens after your attempt
Correct Answer

C. (2)

Step 1

Concept

Write (a=4q+3).

Step 2

Why this answer is correct

(2a=8q+6=4(2q+1)+2), so the remainder is (2).

Step 3

Exam Tip

After multiplication, do not forget to convert the remainder into the correct range. चरण 1: (a=4q+3) लिखें। चरण 2: (2a=8q+6=4(2q+1)+2), इसलिए शेषफल (2) है। चरण 3: गुणा करने के बाद शेषफल को सही सीमा में बदलना न भूलें।

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