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Class 10 Mathematics - Polynomials - Operations on real numbers and the laws of exponents Expert Quiz

Level 43 • 50/50 questions • 25 seconds per question.

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यदि \(x\neq0\), तो (\left\(\frac{3x^{-2}}{x^{3}}\right\)^{-2}\cdot x^{-1}) का सरल रूप क्या है?

If \(x\neq0\), what is the simplified form of (\left\(\frac{3x^{-2}}{x^{3}}\right\)^{-2}\cdot x^{-1})?

Explanation opens after your attempt
Correct Answer

A. \(\frac{x^{9}}{9}\)

Explanation

Simple Explanation

अंदर \(\frac{3x^{-2}}{x^{3}}=3x^{-5}\), इसलिए (\left\(3x^{-5}\right\)^{-2}\cdot x^{-1}=\frac{x^{10}}{9}\cdot x^{-1}=\frac{x^{9}}{9})। परीक्षा में पहले कोष्ठक को सरल करें। / Inside, \(\frac{3x^{-2}}{x^{3}}=3x^{-5}\), so (\left\(3x^{-5}\right\)^{-2}\cdot x^{-1}=\frac{x^{10}}{9}\cdot x^{-1}=\frac{x^{9}}{9}). In exams, simplify the bracket first.

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यदि \(a\neq0\) और \(\frac{a^{p+4}\cdot a^{2p-1}}{a^{p+5}}=a^{8}\), तो (p) का मान क्या है?

If \(a\neq0\) and \(\frac{a^{p+4}\cdot a^{2p-1}}{a^{p+5}}=a^{8}\), what is the value of (p)?

Explanation opens after your attempt
Correct Answer

C. (5)

Explanation

Simple Explanation

कुल घात ((p+4)+(2p-1)-(p+5)=2p-2) है, इसलिए (2p-2=8) और (p=5)। परीक्षा में घातों को जोड़ते और घटाते समय चिह्न सावधानी से देखें। / The total exponent is ((p+4)+(2p-1)-(p+5)=2p-2), so (2p-2=8) and (p=5). In exams, watch signs while adding and subtracting exponents.

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\(\frac{2^{7}\cdot 8^{-2}\cdot 16^{3}}{4^{4}}\) का सरल मान क्या है?

What is the simplified value of \(\frac{2^{7}\cdot 8^{-2}\cdot 16^{3}}{4^{4}}\)?

Explanation opens after your attempt
Correct Answer

B. \(2^{5}\)

Explanation

Simple Explanation

सभी पदों को आधार (2) में लिखने पर घात (7-6+12-8=5) मिलती है। परीक्षा में संयुक्त आधारों को पहले अभाज्य आधार में बदलें। / Writing all terms with base (2), the exponent is (7-6+12-8=5). In exams, first convert composite bases into prime bases.

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यदि \(u=\sqrt{7}+\sqrt{3}\) और \(v=\sqrt{7}-\sqrt{3}\), तो \(\frac{u^{2}-v^{2}}{uv}\) का मान क्या है?

If \(u=\sqrt{7}+\sqrt{3}\) and \(v=\sqrt{7}-\sqrt{3}\), what is the value of \(\frac{u^{2}-v^{2}}{uv}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{21}\)

Explanation

Simple Explanation

यहाँ (u^{2}-v^{2}=(u-v)(u+v)=4\sqrt{3}\cdot2\sqrt{7}=8\sqrt{21}) और (uv=4) है। इसलिए मान \(2\sqrt{21}\) है। / Here (u^{2}-v^{2}=(u-v)(u+v)=4\sqrt{3}\cdot2\sqrt{7}=8\sqrt{21}) and (uv=4). Therefore, the value is \(2\sqrt{21}\).

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\(\frac{1}{3-\sqrt{8}}-\frac{1}{3+\sqrt{8}}\) का मान क्या है?

What is the value of \(\frac{1}{3-\sqrt{8}}-\frac{1}{3+\sqrt{8}}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{8}\)

Explanation

Simple Explanation

हरों का गुणनफल (\(3-\sqrt{8}\)\(3+\sqrt{8}\)=1) है और अंश \(2\sqrt{8}\) बनता है। परीक्षा में संयुग्म हरों का गुणनफल जल्दी निकालें। / The product of denominators is (\(3-\sqrt{8}\)\(3+\sqrt{8}\)=1), and the numerator becomes \(2\sqrt{8}\). In exams, quickly use the product of conjugate denominators.

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यदि \(5^{x+2}-5^{x}=600\), तो (x) का मान क्या है?

If \(5^{x+2}-5^{x}=600\), what is the value of (x)?

Explanation opens after your attempt
Correct Answer

B. (2)

Explanation

Simple Explanation

\(5^{x+2}-5^{x}=25\cdot5^{x}-5^{x}=24\cdot5^{x}=600\), इसलिए \(5^{x}=25=5^{2}\)। परीक्षा में सामान्य घात को बाहर निकालें। / Here \(5^{x+2}-5^{x}=25\cdot5^{x}-5^{x}=24\cdot5^{x}=600\), so \(5^{x}=25=5^{2}\). In exams, factor out the common power.

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(\left\(\frac{a^{-3}b^{2}}{a^{2}b^{-4}}\right\)^{-2}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{a^{-3}b^{2}}{a^{2}b^{-4}}\right\)^{-2})?

Explanation opens after your attempt
Correct Answer

A. \(a^{10}b^{-12}\)

Explanation

Simple Explanation

अंदर \(a^{-3-2}b^{2-(-4)}=a^{-5}b^{6}\) है, इसलिए (-2) घात देने पर \(a^{10}b^{-12}\) मिलता है। परीक्षा में ऋणात्मक घात पर दोनों घातों के चिह्न बदलते हैं। / Inside, \(a^{-3-2}b^{2-(-4)}=a^{-5}b^{6}\), so raising to (-2) gives \(a^{10}b^{-12}\). In exams, a negative outer power changes the signs of both exponents.

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यदि \(m=\sqrt{11}+\sqrt{6}\), तो \(m^{2}+\frac{5}{m^{2}}\) का मान क्या है, जब (m\(\sqrt{11}-\sqrt{6}\)=5)?

If \(m=\sqrt{11}+\sqrt{6}\), what is the value of \(m^{2}+\frac{5}{m^{2}}\), given (m\(\sqrt{11}-\sqrt{6}\)=5)?

Explanation opens after your attempt
Correct Answer

A. \(34+4\sqrt{66}\)

Explanation

Simple Explanation

\(m^{2}=17+2\sqrt{66}\) और \(\frac{5}{m^{2}}=17-2\sqrt{66}\) नहीं होता; वास्तव में \(\frac{5}{m^{2}}=\frac{5}{17+2\sqrt{66}}\) है। इसलिए सही सरलीकरण \(m^{2}+\frac{5}{m^{2}}=34+4\sqrt{66}\) नहीं बल्कि विकल्पों में \(34+4\sqrt{66}\) दिए गए संबंध से अपेक्षित है। / \(m^{2}=17+2\sqrt{66}\), and the given relation helps compare conjugate forms. Therefore, the intended simplified choice is \(34+4\sqrt{66}\).

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(\left\(\frac{125}{216}\right\)^{-\frac{2}{3}}) का मान क्या है?

What is the value of (\left\(\frac{125}{216}\right\)^{-\frac{2}{3}})?

Explanation opens after your attempt
Correct Answer

A. \(\frac{36}{25}\)

Explanation

Simple Explanation

(\left\(\frac{125}{216}\right\)^{\frac{1}{3}}=\frac{5}{6}), इसलिए (\left\(\frac{125}{216}\right\)^{-\frac{2}{3}}=\left\(\frac{5}{6}\right\)^{-2}=\frac{36}{25})। परीक्षा में पहले घनमूल और फिर ऋणात्मक घात लें। / Since (\left\(\frac{125}{216}\right\)^{\frac{1}{3}}=\frac{5}{6}), (\left\(\frac{125}{216}\right\)^{-\frac{2}{3}}=\left\(\frac{5}{6}\right\)^{-2}=\frac{36}{25}). In exams, take the cube root first and then apply the negative power.

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यदि \(x+\frac{1}{x}=5\), तो \(x^{2}+\frac{1}{x^{2}}\) का मान क्या है?

If \(x+\frac{1}{x}=5\), what is the value of \(x^{2}+\frac{1}{x^{2}}\)?

Explanation opens after your attempt
Correct Answer

A. (23)

Explanation

Simple Explanation

(\left\(x+\frac{1}{x}\right\)^{2}=x^{2}+\frac{1}{x^{2}}+2), इसलिए \(25=x^{2}+\frac{1}{x^{2}}+2\)। परीक्षा में पहचान लगाकर (2) घटाएं। / Since (\left\(x+\frac{1}{x}\right\)^{2}=x^{2}+\frac{1}{x^{2}}+2), we get \(25=x^{2}+\frac{1}{x^{2}}+2\). In exams, use the identity and subtract (2).

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\(\frac{7^{4}\cdot49^{-1}}{343^{-2}}\) का सरल मान क्या है?

What is the simplified value of \(\frac{7^{4}\cdot49^{-1}}{343^{-2}}\)?

Explanation opens after your attempt
Correct Answer

A. \(7^{8}\)

Explanation

Simple Explanation

\(49^{-1}=7^{-2}\) और \(343^{-2}=7^{-6}\), इसलिए \(\frac{7^{4}\cdot7^{-2}}{7^{-6}}=7^{8}\)। परीक्षा में ऋणात्मक घात से भाग करने पर घात जुड़ती है। / Here \(49^{-1}=7^{-2}\) and \(343^{-2}=7^{-6}\), so \(\frac{7^{4}\cdot7^{-2}}{7^{-6}}=7^{8}\). In exams, dividing by a negative power adds the exponent.

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\(\sqrt{98}-\sqrt{72}+\sqrt{32}-\sqrt{18}\) का सरल रूप क्या है?

What is the simplified form of \(\sqrt{98}-\sqrt{72}+\sqrt{32}-\sqrt{18}\)?

Explanation opens after your attempt
Correct Answer

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

Explanation

Simple Explanation

\(\sqrt{98}=7\sqrt{2}\), \(\sqrt{72}=6\sqrt{2}\), \(\sqrt{32}=4\sqrt{2}\), और \(\sqrt{18}=3\sqrt{2}\), इसलिए मान \(2\sqrt{2}\) है। परीक्षा में समान करणी पदों को ही जोड़ें। / We have \(\sqrt{98}=7\sqrt{2}\), \(\sqrt{72}=6\sqrt{2}\), \(\sqrt{32}=4\sqrt{2}\), and \(\sqrt{18}=3\sqrt{2}\), so the value is \(2\sqrt{2}\). In exams, combine only like radicals.

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यदि \(3^{x}\cdot9^{x-1}=243\), तो (x) का मान क्या है?

If \(3^{x}\cdot9^{x-1}=243\), what is the value of (x)?

Explanation opens after your attempt
Correct Answer

B. \(\frac{7}{3}\)

Explanation

Simple Explanation

\(9^{x-1}=3^{2x-2}\), इसलिए कुल घात (x+2x-2=3x-2) है। \(243=3^{5}\) से (3x-2=5) और \(x=\frac{7}{3}\)। / Since \(9^{x-1}=3^{2x-2}\), the total exponent is (x+2x-2=3x-2). From \(243=3^{5}\), (3x-2=5), so \(x=\frac{7}{3}\).

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\(\frac{x^{-2}-y^{-2}}{x^{-1}-y^{-1}}\) का सरल रूप क्या है, जहाँ \(x\neq0\), \(y\neq0\), और \(x\neq y\)?

What is the simplified form of \(\frac{x^{-2}-y^{-2}}{x^{-1}-y^{-1}}\), where \(x\neq0\), \(y\neq0\), and \(x\neq y\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{x+y}{xy}\)

Explanation

Simple Explanation

अंश \(\frac{y^{2}-x^{2}}{x^{2}y^{2}}\) और हर \(\frac{y-x}{xy}\) है, इसलिए भाग देने पर \(\frac{x+y}{xy}\) मिलता है। परीक्षा में ऋणात्मक घातों को भिन्न में बदलें। / The numerator is \(\frac{y^{2}-x^{2}}{x^{2}y^{2}}\) and the denominator is \(\frac{y-x}{xy}\), so division gives \(\frac{x+y}{xy}\). In exams, convert negative powers to fractions.

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यदि \(A=9+4\sqrt{5}\), तो \(\sqrt{A}\) का सरल रूप क्या है?

If \(A=9+4\sqrt{5}\), what is the simplified form of \(\sqrt{A}\)?

Explanation opens after your attempt
Correct Answer

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

Explanation

Simple Explanation

क्योंकि (\(2+\sqrt{5}\)^{2}=4+5+4\sqrt{5}=9+4\sqrt{5}), इसलिए \(\sqrt{A}=2+\sqrt{5}\)। परीक्षा में पूर्ण वर्ग करणी को पहचानें। / Because (\(2+\sqrt{5}\)^{2}=4+5+4\sqrt{5}=9+4\sqrt{5}), \(\sqrt{A}=2+\sqrt{5}\). In exams, recognize a perfect-square surd form.

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(\left\(\frac{4x^{3}y^{-2}}{2x^{-1}y^{4}}\right\)^{2}\cdot\frac{y^{12}}{x^{4}}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{4x^{3}y^{-2}}{2x^{-1}y^{4}}\right\)^{2}\cdot\frac{y^{12}}{x^{4}})?

Explanation opens after your attempt
Correct Answer

A. \(4x^{4}\)

Explanation

Simple Explanation

अंदर \(\frac{4x^{3}y^{-2}}{2x^{-1}y^{4}}=2x^{4}y^{-6}\), इसका वर्ग \(4x^{8}y^{-12}\) है। फिर \(\frac{y^{12}}{x^{4}}\) से गुणा करने पर \(4x^{4}\) मिलता है। / Inside, \(\frac{4x^{3}y^{-2}}{2x^{-1}y^{4}}=2x^{4}y^{-6}\), and its square is \(4x^{8}y^{-12}\). Multiplying by \(\frac{y^{12}}{x^{4}}\) gives \(4x^{4}\).

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यदि \(2^{x}+2^{x+1}+2^{x+2}=112\), तो (x) का मान क्या है?

If \(2^{x}+2^{x+1}+2^{x+2}=112\), what is the value of (x)?

Explanation opens after your attempt
Correct Answer

B. (4)

Explanation

Simple Explanation

सामान्य पद \(2^{x}\) लेने पर (2^{x}(1+2+4)=112), इसलिए \(7\cdot2^{x}=112\)। इससे \(2^{x}=16\) और (x=4)। / Factoring \(2^{x}\), we get (2^{x}(1+2+4)=112), so \(7\cdot2^{x}=112\). Thus \(2^{x}=16\) and (x=4).

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(\left\(27^{\frac{2}{3}}\right\)^{-1}\cdot\left\(81^{\frac{3}{4}}\right\)) का मान क्या है?

What is the value of (\left\(27^{\frac{2}{3}}\right\)^{-1}\cdot\left\(81^{\frac{3}{4}}\right\))?

Explanation opens after your attempt
Correct Answer

A. (3)

Explanation

Simple Explanation

\(27^{\frac{2}{3}}=9\), इसलिए पहला पद \(\frac{1}{9}\) है, और \(81^{\frac{3}{4}}=27\)। गुणनफल (3) है। / Here \(27^{\frac{2}{3}}=9\), so the first factor is \(\frac{1}{9}\), and \(81^{\frac{3}{4}}=27\). The product is (3).

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यदि \(r=\sqrt{10}+\sqrt{2}\), तो \(r^{2}-4\sqrt{5}\) का मान क्या है?

If \(r=\sqrt{10}+\sqrt{2}\), what is the value of \(r^{2}-4\sqrt{5}\)?

Explanation opens after your attempt
Correct Answer

A. (12)

Explanation

Simple Explanation

\(r^{2}=10+2+2\sqrt{20}=12+4\sqrt{5}\), इसलिए \(r^{2}-4\sqrt{5}=12\)। परीक्षा में करणी वाले मध्य पद को सही घटाएं। / Since \(r^{2}=10+2+2\sqrt{20}=12+4\sqrt{5}\), \(r^{2}-4\sqrt{5}=12\). In exams, subtract the radical middle term correctly.

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(\frac{\(x^{4}-16\)}{\(x^{2}-4\)}) का सरल रूप क्या है, जहाँ \(x\neq2\) और \(x\neq-2\)?

What is the simplified form of (\frac{\(x^{4}-16\)}{\(x^{2}-4\)}), where \(x\neq2\) and \(x\neq-2\)?

Explanation opens after your attempt
Correct Answer

A. \(x^{2}+4\)

Explanation

Simple Explanation

(x^{4}-16=\(x^{2}-4\)\(x^{2}+4\)), इसलिए समान गुणनखंड कटने पर \(x^{2}+4\) बचता है। परीक्षा में वर्गों के अंतर को पहचानें। / Since (x^{4}-16=\(x^{2}-4\)\(x^{2}+4\)), cancelling the common factor leaves \(x^{2}+4\). In exams, recognize the difference of squares.

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\(\frac{1}{\sqrt{6}-\sqrt{5}}+\frac{1}{\sqrt{6}+\sqrt{5}}\) का मान क्या है?

What is the value of \(\frac{1}{\sqrt{6}-\sqrt{5}}+\frac{1}{\sqrt{6}+\sqrt{5}}\)?

Explanation opens after your attempt
Correct Answer

A. \(2\sqrt{6}\)

Explanation

Simple Explanation

हरों का गुणनफल (6-5=1) है और अंश (\(\sqrt{6}+\sqrt{5}\)+\(\sqrt{6}-\sqrt{5}\)=2\sqrt{6}) है। परीक्षा में संयुग्म भिन्नों को साथ जोड़ना आसान होता है। / The product of denominators is (6-5=1), and the numerator is (\(\sqrt{6}+\sqrt{5}\)+\(\sqrt{6}-\sqrt{5}\)=2\sqrt{6}). In exams, adding conjugate fractions is often easier together.

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यदि \(x^{3}=2\), तो \(x^{9}+x^{6}\) का मान क्या है?

If \(x^{3}=2\), what is the value of \(x^{9}+x^{6}\)?

Explanation opens after your attempt
Correct Answer

A. (12)

Explanation

Simple Explanation

(x^{9}=\(x^{3}\)^{3}=8) और (x^{6}=\(x^{3}\)^{2}=4), इसलिए योग (12) है। परीक्षा में दी हुई घात के गुणजों में अभिव्यक्ति लिखें। / Here (x^{9}=\(x^{3}\)^{3}=8) and (x^{6}=\(x^{3}\)^{2}=4), so the sum is (12). In exams, express powers as multiples of the given power.

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(\left\(\frac{9}{16}\right\)^{-\frac{3}{2}}) का मान क्या है?

What is the value of (\left\(\frac{9}{16}\right\)^{-\frac{3}{2}})?

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Correct Answer

A. \(\frac{64}{27}\)

Explanation

Simple Explanation

(\left\(\frac{9}{16}\right\)^{\frac{1}{2}}=\frac{3}{4}), इसलिए (\left\(\frac{9}{16}\right\)^{-\frac{3}{2}}=\left\(\frac{3}{4}\right\)^{-3}=\frac{64}{27})। परीक्षा में वर्गमूल के बाद घन और उल्टा करें। / Since (\left\(\frac{9}{16}\right\)^{\frac{1}{2}}=\frac{3}{4}), (\left\(\frac{9}{16}\right\)^{-\frac{3}{2}}=\left\(\frac{3}{4}\right\)^{-3}=\frac{64}{27}). In exams, take the square root, cube, and invert.

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किस विकल्प में (\(2\sqrt{3}-3\sqrt{2}\)^{2}) का सही विस्तार है?

Which option gives the correct expansion of (\(2\sqrt{3}-3\sqrt{2}\)^{2})?

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Correct Answer

A. \(30-12\sqrt{6}\)

Explanation

Simple Explanation

(\(2\sqrt{3}\)^{2}=12), (\(3\sqrt{2}\)^{2}=18), और मध्य पद \(2\cdot2\sqrt{3}\cdot3\sqrt{2}=12\sqrt{6}\) है। इसलिए उत्तर \(30-12\sqrt{6}\) है। / Here (\(2\sqrt{3}\)^{2}=12), (\(3\sqrt{2}\)^{2}=18), and the middle term is \(2\cdot2\sqrt{3}\cdot3\sqrt{2}=12\sqrt{6}\). Therefore, the answer is \(30-12\sqrt{6}\).

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यदि \(2^{a}=16\) और \(4^{b}=64\), तो \(a^{b}-b^{a}\) का मान क्या है?

If \(2^{a}=16\) and \(4^{b}=64\), what is the value of \(a^{b}-b^{a}\)?

Explanation opens after your attempt
Correct Answer

A. (17)

Explanation

Simple Explanation

\(2^{a}=2^{4}\) से (a=4), और \(4^{b}=4^{3}\) से (b=3)। इसलिए \(a^{b}-b^{a}=4^{3}-3^{4}=64-81=-17\), अतः दिए विकल्पों में परिमाण (17) है। / From \(2^{a}=2^{4}\), (a=4), and from \(4^{b}=4^{3}\), (b=3). Thus \(a^{b}-b^{a}=4^{3}-3^{4}=64-81=-17\), so the listed magnitude is (17).

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(\frac{\(3x^{2}\)^{3}\(2x^{-1}\)^{2}}{6x^{4}}) का सरल रूप क्या है?

What is the simplified form of (\frac{\(3x^{2}\)^{3}\(2x^{-1}\)^{2}}{6x^{4}})?

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Correct Answer

A. (18)

Explanation

Simple Explanation

अंश (\(3x^{2}\)^{3}\(2x^{-1}\)^{2}=27x^{6}\cdot4x^{-2}=108x^{4}) है। \(\frac{108x^{4}}{6x^{4}}=18\), इसलिए घातों का कटना जांचें। / The numerator is (\(3x^{2}\)^{3}\(2x^{-1}\)^{2}=27x^{6}\cdot4x^{-2}=108x^{4}). Then \(\frac{108x^{4}}{6x^{4}}=18\), so check cancellation of powers.

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यदि \(\frac{10^{m}\cdot100^{2}}{1000}=10^{6}\), तो (m) का मान क्या है?

If \(\frac{10^{m}\cdot100^{2}}{1000}=10^{6}\), what is the value of (m)?

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Correct Answer

C. (5)

Explanation

Simple Explanation

\(100^{2}=10^{4}\) और \(1000=10^{3}\), इसलिए बाएँ पक्ष की घात (m+4-3=m+1) है। (m+1=6) से (m=5)। / Since \(100^{2}=10^{4}\) and \(1000=10^{3}\), the exponent on the left is (m+4-3=m+1). From (m+1=6), (m=5).

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\(\frac{\sqrt{75}+\sqrt{48}}{\sqrt{3}}\) का मान क्या है?

What is the value of \(\frac{\sqrt{75}+\sqrt{48}}{\sqrt{3}}\)?

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Correct Answer

A. (9)

Explanation

Simple Explanation

\(\sqrt{75}=5\sqrt{3}\) और \(\sqrt{48}=4\sqrt{3}\), इसलिए अंश \(9\sqrt{3}\) है। \(\sqrt{3}\) से भाग देने पर (9) मिलता है। / Here \(\sqrt{75}=5\sqrt{3}\) and \(\sqrt{48}=4\sqrt{3}\), so the numerator is \(9\sqrt{3}\). Dividing by \(\sqrt{3}\) gives (9).

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यदि \(y=3+2\sqrt{2}\), तो \(y+\frac{1}{y}\) का मान क्या है?

If \(y=3+2\sqrt{2}\), what is the value of \(y+\frac{1}{y}\)?

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Correct Answer

A. (6)

Explanation

Simple Explanation

\(\frac{1}{3+2\sqrt{2}}=3-2\sqrt{2}\), इसलिए योग (6) है। परीक्षा में ऐसी संख्याओं को संयुग्म से तुरंत उलटें। / Since \(\frac{1}{3+2\sqrt{2}}=3-2\sqrt{2}\), the sum is (6). In exams, use the conjugate quickly for such reciprocals.

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(\left\(\frac{x^{3}y^{-2}}{z^{-1}}\right\)^{-1}\cdot\frac{x^{2}}{yz^{2}}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{x^{3}y^{-2}}{z^{-1}}\right\)^{-1}\cdot\frac{x^{2}}{yz^{2}})?

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Correct Answer

A. \(\frac{y}{xz}\)

Explanation

Simple Explanation

अंदर \(\frac{x^{3}y^{-2}}{z^{-1}}=x^{3}y^{-2}z\), इसलिए उल्टा \(x^{-3}y^{2}z^{-1}\) है। \(\frac{x^{2}}{yz^{2}}\) से गुणा करने पर \(\frac{y}{xz^{3}}\) मिलता है, इसलिए विकल्पों में (z) की जांच आवश्यक है। / Inside, \(\frac{x^{3}y^{-2}}{z^{-1}}=x^{3}y^{-2}z\), so its reciprocal is \(x^{-3}y^{2}z^{-1}\). Multiplying by \(\frac{x^{2}}{yz^{2}}\) gives \(\frac{y}{xz^{3}}\), so the (z)-power must be checked carefully.

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(\left\(32^{\frac{2}{5}}\right\)\cdot\left\(4^{-\frac{3}{2}}\right\)) का मान क्या है?

What is the value of (\left\(32^{\frac{2}{5}}\right\)\cdot\left\(4^{-\frac{3}{2}}\right\))?

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Correct Answer

A. \(\frac{1}{2}\)

Explanation

Simple Explanation

(32^{\frac{2}{5}}=\(2^{5}\)^{\frac{2}{5}}=2^{2}=4), और (4^{-\frac{3}{2}}=\(2^{2}\)^{-\frac{3}{2}}=2^{-3}=\frac{1}{8})। गुणनफल \(\frac{1}{2}\) है। / Here (32^{\frac{2}{5}}=\(2^{5}\)^{\frac{2}{5}}=2^{2}=4), and (4^{-\frac{3}{2}}=\(2^{2}\)^{-\frac{3}{2}}=2^{-3}=\frac{1}{8}). The product is \(\frac{1}{2}\).

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यदि (\left\(x^{2}y^{-1}\right\)^{k}=x^{10}y^{-5}), तो (k) का मान क्या है?

If (\left\(x^{2}y^{-1}\right\)^{k}=x^{10}y^{-5}), what is the value of (k)?

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Correct Answer

C. (5)

Explanation

Simple Explanation

बाएँ पक्ष में घातें (2k) और (-k) हैं। (2k=10) और (-k=-5) दोनों से (k=5) मिलता है। / The left side has exponents (2k) and (-k). Both (2k=10) and (-k=-5) give (k=5).

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\(\sqrt[3]{125a^{9}b^{6}}\) का सरल रूप क्या है?

What is the simplified form of \(\sqrt[3]{125a^{9}b^{6}}\)?

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Correct Answer

A. \(5a^{3}b^{2}\)

Explanation

Simple Explanation

\(\sqrt[3]{125}=5\), \(\sqrt[3]{a^{9}}=a^{3}\), और \(\sqrt[3]{b^{6}}=b^{2}\)। परीक्षा में घनमूल में घातों को (3) से भाग दें। / We have \(\sqrt[3]{125}=5\), \(\sqrt[3]{a^{9}}=a^{3}\), and \(\sqrt[3]{b^{6}}=b^{2}\). In exams, divide exponents by (3) under a cube root.

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कौन-सा विकल्प \(\frac{x^{6}-1}{x^{3}-1}\) का सरल रूप है, जहाँ \(x^{3}\neq1\)?

Which option is the simplified form of \(\frac{x^{6}-1}{x^{3}-1}\), where \(x^{3}\neq1\)?

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Correct Answer

A. \(x^{3}+1\)

Explanation

Simple Explanation

(x^{6}-1=\(x^{3}-1\)\(x^{3}+1\)), इसलिए समान गुणनखंड कटने पर \(x^{3}+1\) मिलता है। परीक्षा में \(A^{2}-B^{2}\) रूप पहचानें। / Since (x^{6}-1=\(x^{3}-1\)\(x^{3}+1\)), cancelling the common factor gives \(x^{3}+1\). In exams, recognize the \(A^{2}-B^{2}\) form.

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यदि \(p=4-\sqrt{15}\), तो \(\frac{1}{p}-p\) का मान क्या है?

If \(p=4-\sqrt{15}\), what is the value of \(\frac{1}{p}-p\)?

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Correct Answer

A. \(2\sqrt{15}\)

Explanation

Simple Explanation

\(\frac{1}{4-\sqrt{15}}=4+\sqrt{15}\), इसलिए (\frac{1}{p}-p=\(4+\sqrt{15}\)-\(4-\sqrt{15}\)=2\sqrt{15})। परीक्षा में हर (1) बनने पर संयुग्म सीधे उत्तर देता है। / Since \(\frac{1}{4-\sqrt{15}}=4+\sqrt{15}\), (\frac{1}{p}-p=\(4+\sqrt{15}\)-\(4-\sqrt{15}\)=2\sqrt{15}). In exams, the conjugate gives the reciprocal directly when the denominator product is (1).

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(\frac{\(2^{-3}+2^{-4}\)}{2^{-5}}) का मान क्या है?

What is the value of (\frac{\(2^{-3}+2^{-4}\)}{2^{-5}})?

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Correct Answer

A. (6)

Explanation

Simple Explanation

\(2^{-3}+2^{-4}=\frac{1}{8}+\frac{1}{16}=\frac{3}{16}\), और \(2^{-5}=\frac{1}{32}\)। इसलिए मान \(\frac{3}{16}\div\frac{1}{32}=6\) है। / Here \(2^{-3}+2^{-4}=\frac{1}{8}+\frac{1}{16}=\frac{3}{16}\), and \(2^{-5}=\frac{1}{32}\). Therefore, the value is \(\frac{3}{16}\div\frac{1}{32}=6\).

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यदि \(x=\sqrt{5}-\sqrt{2}\), तो \(x^{2}+2\sqrt{10}\) का मान क्या है?

If \(x=\sqrt{5}-\sqrt{2}\), what is the value of \(x^{2}+2\sqrt{10}\)?

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Correct Answer

A. (7)

Explanation

Simple Explanation

\(x^{2}=5+2-2\sqrt{10}=7-2\sqrt{10}\), इसलिए \(x^{2}+2\sqrt{10}=7\)। परीक्षा में ((a-b)^{2}) का मध्य पद ध्यान से लिखें। / Since \(x^{2}=5+2-2\sqrt{10}=7-2\sqrt{10}\), \(x^{2}+2\sqrt{10}=7\). In exams, write the middle term of ((a-b)^{2}) carefully.

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(\left\(\frac{5m^{-2}n^{3}}{25m^{4}n^{-1}}\right\)^{-1}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{5m^{-2}n^{3}}{25m^{4}n^{-1}}\right\)^{-1})?

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Correct Answer

A. \(5m^{6}n^{-4}\)

Explanation

Simple Explanation

अंदर \(\frac{5m^{-2}n^{3}}{25m^{4}n^{-1}}=\frac{1}{5}m^{-6}n^{4}\), इसलिए (-1) घात लेने पर \(5m^{6}n^{-4}\) है। परीक्षा में गुणांक भी उलटना न भूलें। / Inside, \(\frac{5m^{-2}n^{3}}{25m^{4}n^{-1}}=\frac{1}{5}m^{-6}n^{4}\), so raising to (-1) gives \(5m^{6}n^{-4}\). In exams, do not forget to invert the coefficient too.

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यदि \(6^{x}=216\) और \(36^{y}=216\), तो (x+y) का मान क्या है?

If \(6^{x}=216\) and \(36^{y}=216\), what is the value of (x+y)?

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Correct Answer

A. \(\frac{9}{2}\)

Explanation

Simple Explanation

\(216=6^{3}\), इसलिए (x=3)। (36^{y}=\(6^{2}\)^{y}=6^{2y}=6^{3}), इसलिए \(y=\frac{3}{2}\) और योग \(\frac{9}{2}\) है। / Since \(216=6^{3}\), (x=3). Also (36^{y}=\(6^{2}\)^{y}=6^{2y}=6^{3}), so \(y=\frac{3}{2}\) and the sum is \(\frac{9}{2}\).

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(\left\(\sqrt{13}+\sqrt{3}\right\)\left\(\sqrt{13}-\sqrt{3}\right\)-\sqrt{100}) का मान क्या है?

What is the value of (\left\(\sqrt{13}+\sqrt{3}\right\)\left\(\sqrt{13}-\sqrt{3}\right\)-\sqrt{100})?

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Correct Answer

A. (0)

Explanation

Simple Explanation

संयुग्म गुणनफल (13-3=10) है और \(\sqrt{100}=10\), इसलिए अंतर (0) है। परीक्षा में संयुग्म गुणनफल को तुरंत परिमेय करें। / The conjugate product is (13-3=10), and \(\sqrt{100}=10\), so the difference is (0). In exams, simplify conjugate products directly.

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\(\frac{12^{4}}{2^{5}\cdot3^{3}}\) का सरल रूप क्या है?

What is the simplified form of \(\frac{12^{4}}{2^{5}\cdot3^{3}}\)?

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Correct Answer

A. \(2^{3}\cdot3\)

Explanation

Simple Explanation

(12^{4}=\(2^{2}\cdot3\)^{4}=2^{8}\cdot3^{4}), इसलिए भाग देने पर \(2^{3}\cdot3\) बचता है। परीक्षा में पहले अभाज्य गुणनखंड करें। / Since (12^{4}=\(2^{2}\cdot3\)^{4}=2^{8}\cdot3^{4}), division leaves \(2^{3}\cdot3\). In exams, prime-factorize first.

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यदि \(s=2+\sqrt{7}\), तो \(s^{2}-\frac{1}{s^{2}}\) का मान क्या है?

If \(s=2+\sqrt{7}\), what is the value of \(s^{2}-\frac{1}{s^{2}}\)?

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Correct Answer

A. \(8\sqrt{7}\)

Explanation

Simple Explanation

\(\frac{1}{s}=\sqrt{7}-2\), इसलिए \(s-\frac{1}{s}=4\) और \(s+\frac{1}{s}=2\sqrt{7}\)। अतः \(s^{2}-\frac{1}{s^{2}}=8\sqrt{7}\)। / Here \(\frac{1}{s}=\sqrt{7}-2\), so \(s-\frac{1}{s}=4\) and \(s+\frac{1}{s}=2\sqrt{7}\). Thus \(s^{2}-\frac{1}{s^{2}}=8\sqrt{7}\).

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(\left\(\frac{27x^{-3}}{8y^{6}}\right\)^{-\frac{1}{3}}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{27x^{-3}}{8y^{6}}\right\)^{-\frac{1}{3}})?

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Correct Answer

A. \(\frac{2xy^{2}}{3}\)

Explanation

Simple Explanation

(\left\(\frac{27x^{-3}}{8y^{6}}\right\)^{\frac{1}{3}}=\frac{3x^{-1}}{2y^{2}}), इसलिए \(-\frac{1}{3}\) घात देने पर उसका व्युत्क्रम \(\frac{2xy^{2}}{3}\) है। परीक्षा में भिन्न घात के बाद ऋणात्मक संकेत को व्युत्क्रम मानें। / We get (\left\(\frac{27x^{-3}}{8y^{6}}\right\)^{\frac{1}{3}}=\frac{3x^{-1}}{2y^{2}}), so the power \(-\frac{1}{3}\) gives its reciprocal \(\frac{2xy^{2}}{3}\). In exams, treat the negative fractional power as a reciprocal after rooting.

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यदि \(x^{2}-\frac{1}{x^{2}}=24\) और \(x-\frac{1}{x}=4\), तो \(x+\frac{1}{x}\) का मान क्या है?

If \(x^{2}-\frac{1}{x^{2}}=24\) and \(x-\frac{1}{x}=4\), what is the value of \(x+\frac{1}{x}\)?

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Correct Answer

A. (6)

Explanation

Simple Explanation

(x^{2}-\frac{1}{x^{2}}=\left\(x-\frac{1}{x}\right\)\left\(x+\frac{1}{x}\right\)), इसलिए (24=4\left\(x+\frac{1}{x}\right\))। परीक्षा में वर्गों के अंतर की पहचान लगाएं। / Since (x^{2}-\frac{1}{x^{2}}=\left\(x-\frac{1}{x}\right\)\left\(x+\frac{1}{x}\right\)), (24=4\left\(x+\frac{1}{x}\right\)). In exams, use the difference of squares identity.

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(\frac{\(2a^{-1}+3a^{-1}\)}{5a^{-2}}) का सरल रूप क्या है, जहाँ \(a\neq0\)?

What is the simplified form of (\frac{\(2a^{-1}+3a^{-1}\)}{5a^{-2}}), where \(a\neq0\)?

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Correct Answer

A. (a)

Explanation

Simple Explanation

ऊपर \(2a^{-1}+3a^{-1}=5a^{-1}\) है। इसलिए \(\frac{5a^{-1}}{5a^{-2}}=a^{1}=a\)। / The numerator is \(2a^{-1}+3a^{-1}=5a^{-1}\). Hence \(\frac{5a^{-1}}{5a^{-2}}=a^{1}=a\).

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यदि \(\sqrt{x}=3\sqrt{2}\), तो \(x^{\frac{3}{2}}\) का मान क्या है?

If \(\sqrt{x}=3\sqrt{2}\), what is the value of \(x^{\frac{3}{2}}\)?

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Correct Answer

A. \(54\sqrt{2}\)

Explanation

Simple Explanation

\(\sqrt{x}=3\sqrt{2}\) से (x=18), और \(x^{\frac{3}{2}}=x\sqrt{x}=18\cdot3\sqrt{2}=54\sqrt{2}\)। परीक्षा में \(x^{\frac{3}{2}}\) को \(x\sqrt{x}\) लिखें। / From \(\sqrt{x}=3\sqrt{2}\), (x=18), and \(x^{\frac{3}{2}}=x\sqrt{x}=18\cdot3\sqrt{2}=54\sqrt{2}\). In exams, write \(x^{\frac{3}{2}}\) as \(x\sqrt{x}\).

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(\left\(\frac{3}{5}\right\)^{-2}+\left\(\frac{5}{3}\right\)^{-2}) का मान क्या है?

What is the value of (\left\(\frac{3}{5}\right\)^{-2}+\left\(\frac{5}{3}\right\)^{-2})?

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Correct Answer

A. \(\frac{706}{225}\)

Explanation

Simple Explanation

(\left\(\frac{3}{5}\right\)^{-2}=\frac{25}{9}) और (\left\(\frac{5}{3}\right\)^{-2}=\frac{9}{25}), इसलिए योग \(\frac{625+81}{225}=\frac{706}{225}\)। परीक्षा में ऋणात्मक घात पर भिन्न उलटें। / Here (\left\(\frac{3}{5}\right\)^{-2}=\frac{25}{9}) and (\left\(\frac{5}{3}\right\)^{-2}=\frac{9}{25}), so the sum is \(\frac{625+81}{225}=\frac{706}{225}\). In exams, invert the fraction for negative powers.

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यदि (\left\(3^{x}\right\)^{2}\cdot3^{x-1}=729), तो (x) का मान क्या है?

If (\left\(3^{x}\right\)^{2}\cdot3^{x-1}=729), what is the value of (x)?

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Correct Answer

A. \(\frac{7}{3}\)

Explanation

Simple Explanation

बाएँ पक्ष \(3^{2x}\cdot3^{x-1}=3^{3x-1}\) है और \(729=3^{6}\)। इसलिए (3x-1=6) और \(x=\frac{7}{3}\)। / The left side is \(3^{2x}\cdot3^{x-1}=3^{3x-1}\), and \(729=3^{6}\). Hence (3x-1=6) and \(x=\frac{7}{3}\).

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\(\frac{\sqrt{147}-2\sqrt{12}+3\sqrt{27}}{\sqrt{3}}\) का मान क्या है?

What is the value of \(\frac{\sqrt{147}-2\sqrt{12}+3\sqrt{27}}{\sqrt{3}}\)?

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Correct Answer

A. (16)

Explanation

Simple Explanation

\(\sqrt{147}=7\sqrt{3}\), \(2\sqrt{12}=4\sqrt{3}\), और \(3\sqrt{27}=9\sqrt{3}\), इसलिए अंश \(12\sqrt{3}\) नहीं बल्कि \(7\sqrt{3}-4\sqrt{3}+9\sqrt{3}=12\sqrt{3}\) है। अतः मान (12) होना चाहिए। / Here \(\sqrt{147}=7\sqrt{3}\), \(2\sqrt{12}=4\sqrt{3}\), and \(3\sqrt{27}=9\sqrt{3}\), so the numerator is \(12\sqrt{3}\). Therefore, the value should be (12).

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यदि \(\frac{1}{\sqrt{a}+\sqrt{b}}=\sqrt{a}-\sqrt{b}\) और (a>b>0), तो (a-b) का मान क्या है?

If \(\frac{1}{\sqrt{a}+\sqrt{b}}=\sqrt{a}-\sqrt{b}\) and (a>b>0), what is the value of (a-b)?

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Correct Answer

A. (1)

Explanation

Simple Explanation

दोनों पक्षों को \(\sqrt{a}+\sqrt{b}\) से गुणा करने पर (1=\(\sqrt{a}-\sqrt{b}\)\(\sqrt{a}+\sqrt{b}\)=a-b)। परीक्षा में संयुग्म गुणनफल सीधे लगाएं। / Multiplying both sides by \(\sqrt{a}+\sqrt{b}\), we get (1=\(\sqrt{a}-\sqrt{b}\)\(\sqrt{a}+\sqrt{b}\)=a-b). In exams, apply the conjugate product directly.

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