Concept-wise Practice

nested-set MCQ Questions for Class 11

nested-set se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

Practice Questions

26 questions tagged with nested-set.

यदि \(A=\{1,{2}\}\), तो कौन सा (P(A)) का अवयव है?

If \(A=\{1,{2}\}\), which is an element of (P(A))?

Explanation opens after your attempt
Correct Answer

B. ({{2}})

Step 1

Concept

({2}) itself is an element of (A), so ({{2}}) is a subset of (A) and an element of (P(A)). Counting the layers is essential.

Step 2

Why this answer is correct

The correct answer is B. ({{2}}). ({2}) itself is an element of (A), so ({{2}}) is a subset of (A) and an element of (P(A)). Counting the layers is essential.

Step 3

Exam Tip

({2}) स्वयं (A) का अवयव है, इसलिए ({{2}}) (A) का उपसमुच्चय है और (P(A)) का अवयव है। परतों को गिनना जरूरी है।

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यदि \(A=\{1,{2,3},4\}\) है, तो निम्न में से कौन सा (\mathcal{P}(A)) का सदस्य है?

If \(A=\{1,{2,3},4\}\), which of the following is a member of (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

B. ({{2,3}})

Step 1

Concept

({2,3}) itself is an element of (A), so ({{2,3}}) is a subset of (A). In exams, treat a nested element as one object.

Step 2

Why this answer is correct

The correct answer is B. ({{2,3}}). ({2,3}) itself is an element of (A), so ({{2,3}}) is a subset of (A). In exams, treat a nested element as one object.

Step 3

Exam Tip

({2,3}) स्वयं (A) का तत्व है, इसलिए ({{2,3}}) (A) का subset है। परीक्षा में nested element को एक object मानें।

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यदि \(A={\varnothing,1,{1}}\) है, तो (\mathcal{P}(A)) में कितने सदस्य होंगे?

If \(A={\varnothing,1,{1}}\), how many members are there in (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

C. (8)

Step 1

Concept

The set (A) has (3) distinct elements, so (|\mathcal{P}(A)|=23=8). In exams, treat \(\varnothing\), (1), and ({1}) as different.

Step 2

Why this answer is correct

The correct answer is C. (8). The set (A) has (3) distinct elements, so (|\mathcal{P}(A)|=23=8). In exams, treat \(\varnothing\), (1), and ({1}) as different.

Step 3

Exam Tip

समुच्चय (A) में (3) अलग-अलग तत्व हैं, इसलिए (|\mathcal{P}(A)|=23=8)। परीक्षा में \(\varnothing\), (1), और ({1}) को अलग मानें।

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यदि \(A={\varnothing,{\varnothing},{{\varnothing}}}\) है, तो (|\mathcal{P}(A)|) कितना होगा?

If \(A={\varnothing,{\varnothing},{{\varnothing}}}\), what is (|\mathcal{P}(A)|)?

Explanation opens after your attempt
Correct Answer

C. (8)

Step 1

Concept

The set (A) has (3) distinct members, so (|\mathcal{P}(A)|=23=8). Nested sets should be counted as separate elements.

Step 2

Why this answer is correct

The correct answer is C. (8). The set (A) has (3) distinct members, so (|\mathcal{P}(A)|=23=8). Nested sets should be counted as separate elements.

Step 3

Exam Tip

समुच्चय (A) में (3) अलग-अलग सदस्य हैं, इसलिए (|\mathcal{P}(A)|=23=8)। nested sets को अलग तत्व मानकर गिनना चाहिए।

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यदि \(A={\varnothing,{\varnothing}}\) है, तो (|\mathcal{P}(A)|) कितना है?

If \(A={\varnothing,{\varnothing}}\), what is (|\mathcal{P}(A)|)?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

The set (A) has two distinct members \(\varnothing\) and \({\varnothing}\), so (|\mathcal{P}(A)|=22=4). In exams, be careful while counting nested elements.

Step 2

Why this answer is correct

The correct answer is C. (4). The set (A) has two distinct members \(\varnothing\) and \({\varnothing}\), so (|\mathcal{P}(A)|=22=4). In exams, be careful while counting nested elements.

Step 3

Exam Tip

समुच्चय (A) में दो अलग सदस्य \(\varnothing\) और \({\varnothing}\) हैं, इसलिए (|\mathcal{P}(A)|=22=4)। परीक्षा में nested elements को गिनते समय सावधान रहें।

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यदि \(A=\{1,{2},3\}\) है, तो निम्न में से कौन सा (\mathcal{P}(A)) का सदस्य है?

If \(A=\{1,{2},3\}\), which of the following is a member of (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

B. ({{2}})

Step 1

Concept

({2}) itself is an element of (A), so ({{2}}) is a subset of (A). In exams, distinguish an element from a singleton set.

Step 2

Why this answer is correct

The correct answer is B. ({{2}}). ({2}) itself is an element of (A), so ({{2}}) is a subset of (A). In exams, distinguish an element from a singleton set.

Step 3

Exam Tip

({2}) स्वयं (A) का एक तत्व है, इसलिए ({{2}}) (A) का उपसमुच्चय है। परीक्षा में तत्व और एकल समुच्चय में फर्क करें।

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यदि \(A=\{1,2,{3,4}\}\), तो (\mathcal{P}(A)) में कौन सा तत्व अवश्य होगा?

If \(A=\{1,2,{3,4}\}\), which element must be in (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

A. ({{3,4}})

Step 1

Concept

({3,4}) is one element of (A), so its singleton subset ({{3,4}}) is in the power set.

Step 2

Why this answer is correct

The correct answer is A. ({{3,4}}). ({3,4}) is one element of (A), so its singleton subset ({{3,4}}) is in the power set.

Step 3

Exam Tip

({3,4}) (A) का एक तत्व है, इसलिए उसका एकल उपसमुच्चय ({{3,4}}) घात समुच्चय में होगा।

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यदि \(A={\emptyset,{a},b}\), तो निम्न में से कौन (\mathcal{P}(A)) का तत्व है?

If \(A={\emptyset,{a},b}\), which of the following is an element of (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

A. \({\emptyset,{a}}\)

Step 1

Concept

\({\emptyset,{a}}\) is a subset of (A). A power set always contains subsets of the original set.

Step 2

Why this answer is correct

The correct answer is A. \({\emptyset,{a}}\). \({\emptyset,{a}}\) is a subset of (A). A power set always contains subsets of the original set.

Step 3

Exam Tip

\({\emptyset,{a}}\), (A) का उपसमुच्चय है। घात समुच्चय में हमेशा मूल समुच्चय के उपसमुच्चय आते हैं।

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यदि \(A=\{1,{2}\}\), तो (\mathcal{P}(A)) में कौन सा अवश्य होगा?

If \(A=\{1,{2}\}\), which must be in (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

B. ({{2}})

Step 1

Concept

({2}) is an element of (A), so its singleton subset ({{2}}) is in the power set. Keep a clear difference between a set and its element.

Step 2

Why this answer is correct

The correct answer is B. ({{2}}). ({2}) is an element of (A), so its singleton subset ({{2}}) is in the power set. Keep a clear difference between a set and its element.

Step 3

Exam Tip

({2}), (A) का एक तत्व है, इसलिए उसका एकल उपसमुच्चय ({{2}}) घात समुच्चय में होगा। सेट और उसके तत्व में अंतर रखें।

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यदि \(A=\{0,{1},2\}\) है, तो निम्न में से कौन सा (\mathcal{P}(A)) का तत्व नहीं है?

If \(A=\{0,{1},2\}\), which of the following is not an element of (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

D. ({0,1})

Step 1

Concept

(1) itself is not an element of (A); ({1}) is an element. So ({0,1}) is not a subset of (A).

Step 2

Why this answer is correct

The correct answer is D. ({0,1}). (1) itself is not an element of (A); ({1}) is an element. So ({0,1}) is not a subset of (A).

Step 3

Exam Tip

(1) स्वयं (A) का तत्व नहीं है बल्कि ({1}) तत्व है। इसलिए ({0,1}), (A) का उपसमुच्चय नहीं है।

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यदि \(A=\{1,{2}\}\) है तो (A) के कितने उपसमुच्चय होंगे?

If \(A=\{1,{2}\}\), how many subsets will (A) have?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

(A) has two elements (1) and ({2}). Therefore it has \(2^2=4\) subsets.

Step 2

Why this answer is correct

The correct answer is C. (4). (A) has two elements (1) and ({2}). Therefore it has \(2^2=4\) subsets.

Step 3

Exam Tip

(A) में दो तत्व हैं (1) और ({2})। इसलिए उपसमुच्चय \(2^2=4\) होंगे।

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यदि \(A=\{{2},4,6\}\) है तो (n(A)) कितना है?

If \(A=\{{2},4,6\}\), what is (n(A))?

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

({2}) is one separate element and (4,6) are two other elements. So (A) has (3) elements.

Step 2

Why this answer is correct

The correct answer is B. (3). ({2}) is one separate element and (4,6) are two other elements. So (A) has (3) elements.

Step 3

Exam Tip

({2}) एक अलग तत्व है और (4,6) दो अन्य तत्व हैं। इसलिए (A) में (3) तत्व हैं।

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यदि \(A=\{{1},2\}\) है तो (n(A)) कितना है?

If \(A=\{{1},2\}\), what is (n(A))?

Explanation opens after your attempt
Correct Answer

B. (2)

Step 1

Concept

({1}) is one element and (2) is another element. Therefore (A) has (2) elements.

Step 2

Why this answer is correct

The correct answer is B. (2). ({1}) is one element and (2) is another element. Therefore (A) has (2) elements.

Step 3

Exam Tip

({1}) एक तत्व है और (2) दूसरा तत्व है। इसलिए (A) में कुल (2) तत्व हैं।

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यदि \(A=\{1,2\}\), \(B=\{1,2,{1,2}\}\), तो कौन सा कथन सही है?

If \(A=\{1,2\}\), \(B=\{1,2,{1,2}\}\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. \(A\in B\) और \(A\subseteq B\) दोनोंBoth \(A\in B\) and \(A\subseteq B\)

Step 1

Concept

(B) contains \(A=\{1,2\}\) as an element, and it also contains (1,2). Hence both relations are true.

Step 2

Why this answer is correct

The correct answer is A. \(A\in B\) और \(A\subseteq B\) दोनों / Both \(A\in B\) and \(A\subseteq B\). (B) contains \(A=\{1,2\}\) as an element, and it also contains (1,2). Hence both relations are true.

Step 3

Exam Tip

(B) में \(A=\{1,2\}\) सदस्य के रूप में है और (1,2) भी (B) में हैं। इसलिए दोनों संबंध सही हैं।

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यदि \(A=\{1,{2},3\}\), तो कौन सा कथन सत्य है?

If \(A=\{1,{2},3\}\), which statement is true?

Explanation opens after your attempt
Correct Answer

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

Step 1

Concept

Here ({2}) is present as one element, but (2) itself is not an element. Brackets are very important in nested sets.

Step 2

Why this answer is correct

The correct answer is A. \({2}\in A\). Here ({2}) is present as one element, but (2) itself is not an element. Brackets are very important in nested sets.

Step 3

Exam Tip

यहाँ ({2}) एक सदस्य के रूप में मौजूद है, लेकिन (2) स्वयं सदस्य नहीं है। नेस्टेड सेट में कोष्ठक बहुत महत्वपूर्ण हैं।

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यदि \(A={\emptyset,{\emptyset},3}\), तो कौन सा (A) का उपसमुच्चय है लेकिन (A) का सदस्य नहीं है?

If \(A={\emptyset,{\emptyset},3}\), which is a subset of (A) but not an element of (A)?

Explanation opens after your attempt
Correct Answer

A. ({3})

Step 1

Concept

({3}) is a subset because \(3\in A\). But ({3}) is not listed as an element of (A).

Step 2

Why this answer is correct

The correct answer is A. ({3}). ({3}) is a subset because \(3\in A\). But ({3}) is not listed as an element of (A).

Step 3

Exam Tip

({3}) का सदस्य (3) (A) में है, इसलिए यह उपसमुच्चय है। लेकिन ({3}) (A) में सदस्य के रूप में नहीं दिया है।

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यदि \(A=\{0,{0}\}\), तो कौन सा (\mathcal{P}(A)) का सदस्य है?

If \(A=\{0,{0}\}\), which is an element of (\mathcal{P}(A))?

Explanation opens after your attempt
Correct Answer

A. ({0})

Step 1

Concept

({0}) is a subset of (A), so it is an element of (\mathcal{P}(A)). Elements of a power set are always subsets.

Step 2

Why this answer is correct

The correct answer is A. ({0}). ({0}) is a subset of (A), so it is an element of (\mathcal{P}(A)). Elements of a power set are always subsets.

Step 3

Exam Tip

({0}) समुच्चय (A) का उपसमुच्चय है, इसलिए यह (\mathcal{P}(A)) का सदस्य है। घात समुच्चय के सदस्य हमेशा उपसमुच्चय होते हैं।

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यदि \(A={\emptyset,{\emptyset},1}\) है, तो कौन सा (A) का उपसमुच्चय नहीं है?

If \(A={\emptyset,{\emptyset},1}\), which is not a subset of (A)?

Explanation opens after your attempt
Correct Answer

D. ({1,2})

Step 1

Concept

The element (2) is not in (A). Every element of a subset must belong to the original set.

Step 2

Why this answer is correct

The correct answer is D. ({1,2}). The element (2) is not in (A). Every element of a subset must belong to the original set.

Step 3

Exam Tip

(2) समुच्चय (A) का सदस्य नहीं है। उपसमुच्चय में हर सदस्य मूल समुच्चय में होना चाहिए।

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यदि \(A={\emptyset,{\emptyset}}\) है, तो (A) के उपसमुच्चयों की संख्या कितनी है?

If \(A={\emptyset,{\emptyset}}\), how many subsets does (A) have?

Explanation opens after your attempt
Correct Answer

C. (4)

Step 1

Concept

The set (A) has two distinct elements: \(\emptyset\) and \({\emptyset}\). Hence it has \(2^2=4\) subsets.

Step 2

Why this answer is correct

The correct answer is C. (4). The set (A) has two distinct elements: \(\emptyset\) and \({\emptyset}\). Hence it has \(2^2=4\) subsets.

Step 3

Exam Tip

(A) में दो अलग सदस्य हैं: \(\emptyset\) और \({\emptyset}\)। इसलिए उपसमुच्चय \(2^2=4\) हैं।

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यदि \(A=\{1,2,{1,2}\}\) है, तो कौन सा कथन सत्य है?

If \(A=\{1,2,{1,2}\}\), which statement is true?

Explanation opens after your attempt
Correct Answer

A. \({1,2}\in A\)

Step 1

Concept

Here ({1,2}) is listed as one element. Distinguish membership from subset relation.

Step 2

Why this answer is correct

The correct answer is A. \({1,2}\in A\). Here ({1,2}) is listed as one element. Distinguish membership from subset relation.

Step 3

Exam Tip

({1,2}) यहाँ एक सदस्य के रूप में दिया है। सदस्यता और उपसमुच्चय को अलग पहचानें।

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यदि \(A=\{1,2,{3}\}\) है तो कौन सा (A) का उपसमुच्चय है?

If \(A=\{1,2,{3}\}\) then which is a subset of (A)?

Explanation opens after your attempt
Correct Answer

A. ({1,{3}})

Step 1

Concept

Both (1) and ({3}) are elements of (A). Since (3) itself is not in (A), options using it may be false.

Step 2

Why this answer is correct

The correct answer is A. ({1,{3}}). Both (1) and ({3}) are elements of (A). Since (3) itself is not in (A), options using it may be false.

Step 3

Exam Tip

(1) और ({3}) दोनों (A) के अवयव हैं। (3) स्वयं (A) में नहीं है इसलिए उससे बने विकल्प गलत हो सकते हैं।

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यदि \(A=\{1,2,{3}\}\) है तो कौन सा (A) का अवयव है?

If \(A=\{1,2,{3}\}\) then which is an element of (A)?

Explanation opens after your attempt
Correct Answer

A. ({3})

Step 1

Concept

({3}) is one whole element while (3) is not separately listed. Keep element and subset different.

Step 2

Why this answer is correct

The correct answer is A. ({3}). ({3}) is one whole element while (3) is not separately listed. Keep element and subset different.

Step 3

Exam Tip

({3}) पूरा एक अवयव है जबकि (3) अलग से अवयव नहीं है। अवयव और उपसमुच्चय का अंतर ध्यान रखें।

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समुच्चय \(A=\{1,2,{3}\}\) के लिए कौन-सा कथन सही है?

For the set \(A=\{1,2,{3}\}\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. \({3}\in A\)({3}) is an element of (A)

Step 1

Concept

The elements of (A) are (1), (2), and ({3}).

Step 2

Why this answer is correct

Here (3) alone is not an element; the whole set ({3}) is one element.

Step 3

Exam Tip

When a set is written inside another set, distinguish element notation from subset notation carefully. चरण 1: (A) के सदस्य (1), (2) और ({3}) हैं। चरण 2: यहाँ (3) अलग सदस्य नहीं है, बल्कि ({3}) पूरा एक सदस्य है। चरण 3: समुच्चय के अंदर लिखे छोटे समुच्चय को सदस्य और उपसमुच्चय के रूप में सावधानी से पहचानें।

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क्या ({1,{2,3}}) और ({1,2,3}) समान समुच्चय हैं?

Are ({1,{2,3}}) and ({1,2,3}) equal sets?

Explanation opens after your attempt
Correct Answer

B. नहीं, क्योंकि ({2,3}) एक अलग तत्व हैNo, because ({2,3}) is a single different element

Step 1

Concept

({1,{2,3}}) has two elements: (1) and ({2,3}).

Step 2

Why this answer is correct

({1,2,3}) has three elements: (1,2,3).

Step 3

Exam Tip

The elements are not the same, so the sets are not equal. चरण 1: ({1,{2,3}}) में दो तत्व हैं, (1) और ({2,3})। चरण 2: ({1,2,3}) में तीन तत्व (1,2,3) हैं। चरण 3: तत्व समान नहीं हैं, इसलिए समुच्चय समान नहीं हैं।

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कौन सा विकल्प \(\phi\) और \({\phi}\) के बारे में सही है?

Which option about \(\phi\) and \({\phi}\) is correct?

Explanation opens after your attempt
Correct Answer

C. \({\phi}\) में एक अवयव है\({\phi}\) has one element

Step 1

Concept

\(\phi\) is the empty set and has no element.

Step 2

Why this answer is correct

\({\phi}\) contains \(\phi\) itself as one element.

Step 3

Exam Tip

Putting a set as an element makes a new set that is not empty. चरण 1: \(\phi\) रिक्त समुच्चय है, इसमें कोई अवयव नहीं होता। चरण 2: \({\phi}\) में \(\phi\) स्वयं एक अवयव है, इसलिए इसमें एक अवयव है। चरण 3: किसी समुच्चय को अवयव के रूप में रखने से नया समुच्चय रिक्त नहीं रहता।

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यदि \(H=\{1,2,{3,4},5\}\) है, तो निम्न में से कौन सा कथन सत्य है?

If \(H=\{1,2,{3,4},5\}\), which of the following statements is true?

Explanation opens after your attempt
Correct Answer

B. \({3,4}\in H\)

Step 1

Concept

The elements of (H) are (1,2,{3,4},5).

Step 2

Why this answer is correct

Here ({3,4}) is one complete element, while (3) and (4) are not separate elements of (H).

Step 3

Exam Tip

Treat a set inside another set as a single element. चरण 1: समुच्चय (H) के अवयव (1,2,{3,4},5) हैं। चरण 2: यहाँ ({3,4}) पूरा समुच्चय एक अवयव है, पर (3) और (4) अलग-अलग अवयव नहीं हैं। चरण 3: समुच्चय के अंदर बने समुच्चय को एक अवयव की तरह देखें।

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