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Class 11 Mathematics Easy Quiz

Level 20 • 50/50 questions • 40 seconds per question.

Level readiness 50/50 Questions
Time Left 33:20 40 sec/question
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Question 1 / 50 0 score
Answered 0/50 Correct 0 Time 33:20

यदि सार्वत्रिक समुच्चय \(U=\{1,2,3,4,5\}\) और \(A=\{1,3\}\) है, तो \(A^c\) क्या होगा?

If the universal set is \(U=\{1,2,3,4,5\}\) and \(A=\{1,3\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({2,4,5})

Step 1

Concept

\(A^c\) contains the elements of (U) that are not in (A). In exams, first remove the elements of (A) from (U).

Step 2

Why this answer is correct

The correct answer is A. ({2,4,5}). \(A^c\) contains the elements of (U) that are not in (A). In exams, first remove the elements of (A) from (U).

Step 3

Exam Tip

\(A^c\) में (U) के वे तत्व आते हैं जो (A) में नहीं हैं। परीक्षा में पहले (U) से (A) के तत्व हटाएं।

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यदि \(U=\{a,b,c,d\}\) और \(A=\{b,d\}\) है, तो \(A^c\) ज्ञात कीजिए।

If \(U=\{a,b,c,d\}\) and \(A=\{b,d\}\), find \(A^c\).

Explanation opens after your attempt
Correct Answer

A. ({a,c})

Step 1

Concept

(A) has (b) and (d), so the remaining elements (a) and (c) are in the complement. While choosing an option, use only elements of (U).

Step 2

Why this answer is correct

The correct answer is A. ({a,c}). (A) has (b) and (d), so the remaining elements (a) and (c) are in the complement. While choosing an option, use only elements of (U).

Step 3

Exam Tip

(A) में (b) और (d) हैं, इसलिए बचे हुए तत्व (a) और (c) पूरक में आएंगे। विकल्प चुनते समय केवल (U) के तत्व देखें।

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समुच्चय (A) के पूरक का सही सूत्र कौन सा है?

Which formula correctly represents the complement of set (A)?

Explanation opens after your attempt
Correct Answer

A. \(A^c=U-A\)

Step 1

Concept

\(A^c\) means removing (A) from (U). Always remember the formula \(A^c=U-A\).

Step 2

Why this answer is correct

The correct answer is A. \(A^c=U-A\). \(A^c\) means removing (A) from (U). Always remember the formula \(A^c=U-A\).

Step 3

Exam Tip

\(A^c\) का अर्थ है (U) में से (A) को हटाना। सूत्र \(A^c=U-A\) को हमेशा याद रखें।

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यदि \(x\in U\) और \(x\notin A\) है, तो (x) किस समुच्चय का तत्व होगा?

If \(x\in U\) and \(x\notin A\), then (x) will be an element of which set?

Explanation opens after your attempt
Correct Answer

A. \(A^c\)complement of (A)

Step 1

Concept

An element that is in (U) but not in (A) belongs to \(A^c\). For membership questions, apply the definition directly.

Step 2

Why this answer is correct

The correct answer is A. \(A^c\) / complement of (A). An element that is in (U) but not in (A) belongs to \(A^c\). For membership questions, apply the definition directly.

Step 3

Exam Tip

जो तत्व (U) में हो लेकिन (A) में न हो, वह \(A^c\) में होता है। सदस्यता वाले प्रश्नों में परिभाषा सीधे लगाएं।

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यदि \(U=\{2,4,6,8\}\) और (A=U) है, तो \(A^c\) क्या होगा?

If \(U=\{2,4,6,8\}\) and (A=U), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)empty set

Step 1

Concept

When (A=U), no element of (U) remains outside (A). Hence the complement is \(\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\) / empty set. When (A=U), no element of (U) remains outside (A). Hence the complement is \(\varnothing\).

Step 3

Exam Tip

जब (A=U) होता है, तब (U) में (A) से बाहर कोई तत्व नहीं बचता। इसलिए पूरक \(\varnothing\) होता है।

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यदि \(U=\{1,2,3\}\) और \(A=\varnothing\) है, तो \(A^c\) क्या होगा?

If \(U=\{1,2,3\}\) and \(A=\varnothing\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. (U)universal set

Step 1

Concept

\(\varnothing\) has no element, so all elements of (U) come in the complement. Remember that \(\varnothing^c=U\).

Step 2

Why this answer is correct

The correct answer is A. (U) / universal set. \(\varnothing\) has no element, so all elements of (U) come in the complement. Remember that \(\varnothing^c=U\).

Step 3

Exam Tip

\(\varnothing\) में कोई तत्व नहीं होता, इसलिए (U) के सभी तत्व पूरक में आते हैं। याद रखें कि \(\varnothing^c=U\) होता है।

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यदि (n(U)=20) और (n(A)=7) है, तो (n\(A^c\)) कितना होगा?

If (n(U)=20) and (n(A)=7), what is (n\(A^c\))?

Explanation opens after your attempt
Correct Answer

A. (13)

Step 1

Concept

If \(A\subseteq U\), then (n\(A^c\)=n(U)-n(A)). Therefore (20-7=13).

Step 2

Why this answer is correct

The correct answer is A. (13). If \(A\subseteq U\), then (n\(A^c\)=n(U)-n(A)). Therefore (20-7=13).

Step 3

Exam Tip

यदि \(A\subseteq U\) है, तो (n\(A^c\)=n(U)-n(A)) होता है। इसलिए (20-7=13) होगा।

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यदि \(U=\{1,2,3,4,5,6\}\) और \(A^c={5,6}\) है, तो (A) क्या होगा?

If \(U=\{1,2,3,4,5,6\}\) and \(A^c={5,6}\), what is (A)?

Explanation opens after your attempt
Correct Answer

A. ({1,2,3,4})

Step 1

Concept

(A) and \(A^c\) together make the whole (U). So (A) has all elements except (5) and (6).

Step 2

Why this answer is correct

The correct answer is A. ({1,2,3,4}). (A) and \(A^c\) together make the whole (U). So (A) has all elements except (5) and (6).

Step 3

Exam Tip

(A) और \(A^c\) मिलकर पूरा (U) बनाते हैं। इसलिए (A) में (5) और (6) को छोड़कर बाकी तत्व होंगे।

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किसी भी समुच्चय (A) के लिए \(A\cup A^c\) किसके बराबर होता है?

For any set (A), \(A\cup A^c\) is equal to what?

Explanation opens after your attempt
Correct Answer

A. (U)universal set

Step 1

Concept

All elements of (A) and \(A^c\) together form (U). This is one of the most important properties of complement.

Step 2

Why this answer is correct

The correct answer is A. (U) / universal set. All elements of (A) and \(A^c\) together form (U). This is one of the most important properties of complement.

Step 3

Exam Tip

(A) और \(A^c\) के सभी तत्व मिलकर (U) बनाते हैं। यह पूरक का सबसे महत्वपूर्ण गुण है।

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किसी भी समुच्चय (A) के लिए \(A\cap A^c\) किसके बराबर होता है?

For any set (A), \(A\cap A^c\) is equal to what?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)empty set

Step 1

Concept

No element can be both in (A) and outside (A) at the same time. Hence \(A\cap A^c=\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\) / empty set. No element can be both in (A) and outside (A) at the same time. Hence \(A\cap A^c=\varnothing\).

Step 3

Exam Tip

कोई तत्व एक साथ (A) में और (A) के बाहर नहीं हो सकता। इसलिए \(A\cap A^c=\varnothing\) होता है।

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किसी भी समुच्चय (A) के लिए (\(A^c\)^c) किसके बराबर होता है?

For any set (A), (\(A^c\)^c) is equal to what?

Explanation opens after your attempt
Correct Answer

A. (A)set (A)

Step 1

Concept

The complement of the complement is the original set. So remember (\(A^c\)^c=A).

Step 2

Why this answer is correct

The correct answer is A. (A) / set (A). The complement of the complement is the original set. So remember (\(A^c\)^c=A).

Step 3

Exam Tip

पूरक का पूरक मूल समुच्चय होता है। इसलिए (\(A^c\)^c=A) याद रखें।

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यदि \(A\subseteq B\) है, तो पूरकों के लिए कौन सा संबंध सही है?

If \(A\subseteq B\), which relation is correct for the complements?

Explanation opens after your attempt
Correct Answer

A. \(B^c\subseteq A^c\)

Step 1

Concept

The complement of the larger set is smaller, so the order reverses. From \(A\subseteq B\), we get \(B^c\subseteq A^c\).

Step 2

Why this answer is correct

The correct answer is A. \(B^c\subseteq A^c\). The complement of the larger set is smaller, so the order reverses. From \(A\subseteq B\), we get \(B^c\subseteq A^c\).

Step 3

Exam Tip

बड़े समुच्चय का पूरक छोटा होता है, इसलिए क्रम उलट जाता है। \(A\subseteq B\) से \(B^c\subseteq A^c\) मिलता है।

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यदि \(U=\{1,2,3,4,5,6,7,8,9,10\}\) और \(A=\{2,4,6,8,10\}\) है, तो \(A^c\) क्या होगा?

If \(U=\{1,2,3,4,5,6,7,8,9,10\}\) and \(A=\{2,4,6,8,10\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({1,3,5,7,9})

Step 1

Concept

(A) contains the even numbers of (U), so the complement contains the odd numbers. In such questions, identify the pattern first.

Step 2

Why this answer is correct

The correct answer is A. ({1,3,5,7,9}). (A) contains the even numbers of (U), so the complement contains the odd numbers. In such questions, identify the pattern first.

Step 3

Exam Tip

(A) में (U) की सम संख्याएं हैं, इसलिए पूरक में विषम संख्याएं आएंगी। ऐसे प्रश्न में पहले पैटर्न पहचानें।

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\(यदि (U={\)अ,आ,इ,क,ख\(}) और (A={\)अ,आ,इ\(}) है, तो (A^c) क्या होगा\)?

\(If (U={\)a,e,i,k,m\(}) and (A={\)a,e,i\(}), what is (A^c)\)?

Explanation opens after your attempt
Correct Answer

A. ({क,ख})({k,m})

Step 1

Concept

\(A^c\) will contain the letters of (U) that are not in (A). In list questions, cross out and write the remaining elements.

Step 2

Why this answer is correct

The correct answer is A. ({क,ख}) / ({k,m\(}). (A^c) will contain the letters of (U) that are not in (A). In list questions, cross out and write the remaining elements.\)

Step 3

Exam Tip

\(A^c\) में (U) के वे अक्षर होंगे जो (A) में नहीं हैं। सूची वाले प्रश्नों में काटकर बचे तत्व लिखें।

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यदि \(U=\{1,2,3,4,5,6,7,8,9\}\) और \(A=\{2,3,5,7\}\) है, तो \(A^c\) क्या होगा?

If \(U=\{1,2,3,4,5,6,7,8,9\}\) and \(A=\{2,3,5,7\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({1,4,6,8,9})

Step 1

Concept

(A) contains the given prime numbers, so the remaining elements are in \(A^c\). Do not treat (1) as a prime number.

Step 2

Why this answer is correct

The correct answer is A. ({1,4,6,8,9}). (A) contains the given prime numbers, so the remaining elements are in \(A^c\). Do not treat (1) as a prime number.

Step 3

Exam Tip

(A) में दी हुई अभाज्य संख्याएं हैं, इसलिए बाकी तत्व \(A^c\) में हैं। (1) को अभाज्य न मानें।

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डी मॉर्गन नियम के अनुसार (\(A\cup B\)^c) किसके बराबर होता है?

According to De Morgan's law, (\(A\cup B\)^c) is equal to what?

Explanation opens after your attempt
Correct Answer

A. \(A^c\cap B^c\)

Step 1

Concept

(\(A\cup B\)^c) contains elements outside both sets. Therefore it equals \(A^c\cap B^c\).

Step 2

Why this answer is correct

The correct answer is A. \(A^c\cap B^c\). (\(A\cup B\)^c) contains elements outside both sets. Therefore it equals \(A^c\cap B^c\).

Step 3

Exam Tip

(\(A\cup B\)^c) में दोनों समुच्चयों से बाहर के तत्व आते हैं। इसलिए यह \(A^c\cap B^c\) के बराबर है।

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डी मॉर्गन नियम के अनुसार (\(A\cap B\)^c) किसके बराबर होता है?

According to De Morgan's law, (\(A\cap B\)^c) is equal to what?

Explanation opens after your attempt
Correct Answer

A. \(A^c\cup B^c\)

Step 1

Concept

(\(A\cap B\)^c) means the part outside the common part. By De Morgan's law, it is \(A^c\cup B^c\).

Step 2

Why this answer is correct

The correct answer is A. \(A^c\cup B^c\). (\(A\cap B\)^c) means the part outside the common part. By De Morgan's law, it is \(A^c\cup B^c\).

Step 3

Exam Tip

(\(A\cap B\)^c) का अर्थ है साझा भाग के बाहर का भाग। डी मॉर्गन नियम से यह \(A^c\cup B^c\) होता है।

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यदि \(U=\{1,2,3,4,5,6\}\), \(A=\{1,2,3\}\) और \(B=\{3,4\}\) है, तो (\(A\cup B\)^c) क्या होगा?

If \(U=\{1,2,3,4,5,6\}\), \(A=\{1,2,3\}\), and \(B=\{3,4\}\), what is (\(A\cup B\)^c)?

Explanation opens after your attempt
Correct Answer

A. ({5,6})

Step 1

Concept

First \(A\cup B={1,2,3,4}\). Its complement is the remaining elements (5) and (6) in (U).

Step 2

Why this answer is correct

The correct answer is A. ({5,6}). First \(A\cup B={1,2,3,4}\). Its complement is the remaining elements (5) and (6) in (U).

Step 3

Exam Tip

पहले \(A\cup B={1,2,3,4}\) बनता है। इसका पूरक (U) में बचे (5) और (6) हैं।

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यदि \(U=\{1,2,3,4,5,6\}\), \(A=\{1,2,3\}\) और \(B=\{3,4\}\) है, तो (\(A\cap B\)^c) क्या होगा?

If \(U=\{1,2,3,4,5,6\}\), \(A=\{1,2,3\}\), and \(B=\{3,4\}\), what is (\(A\cap B\)^c)?

Explanation opens after your attempt
Correct Answer

A. ({1,2,4,5,6})

Step 1

Concept

Here \(A\cap B={3}\). Removing (3) from (U) gives ({1,2,4,5,6}).

Step 2

Why this answer is correct

The correct answer is A. ({1,2,4,5,6}). Here \(A\cap B={3}\). Removing (3) from (U) gives ({1,2,4,5,6}).

Step 3

Exam Tip

यहां \(A\cap B={3}\) है। इसलिए (U) से (3) हटाने पर ({1,2,4,5,6}) मिलता है।

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यदि \(U=\{0,1,2,3,4\}\) और \(A=\{0,2,4\}\) है, तो \(A^c\) ज्ञात करें।

If \(U=\{0,1,2,3,4\}\) and \(A=\{0,2,4\}\), find \(A^c\).

Explanation opens after your attempt
Correct Answer

A. ({1,3})

Step 1

Concept

(A) has (0), (2), and (4), so the remaining elements (1) and (3) are the complement. Count (0) as an element too.

Step 2

Why this answer is correct

The correct answer is A. ({1,3}). (A) has (0), (2), and (4), so the remaining elements (1) and (3) are the complement. Count (0) as an element too.

Step 3

Exam Tip

(A) में (0), (2) और (4) हैं, इसलिए (U) में बचे (1) और (3) पूरक हैं। (0) को भी तत्व की तरह गिनें।

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यदि \(U=\{1,2,3,4\}\) और \(A=\{1,4\}\) है, तो कौन सा कथन सही है?

If \(U=\{1,2,3,4\}\) and \(A=\{1,4\}\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. \(2\in A^c\)

Step 1

Concept

\(A^c={2,3}\), so \(2\in A^c\) is correct. For membership, write the complement clearly first.

Step 2

Why this answer is correct

The correct answer is A. \(2\in A^c\). \(A^c={2,3}\), so \(2\in A^c\) is correct. For membership, write the complement clearly first.

Step 3

Exam Tip

\(A^c={2,3}\), इसलिए \(2\in A^c\) सही है। सदस्यता में पहले पूरक स्पष्ट लिखें।

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कौन सा कथन हर समुच्चय (A) के लिए हमेशा सही है?

Which statement is always true for every set (A)?

Explanation opens after your attempt
Correct Answer

A. \(A^c\subseteq U\)

Step 1

Concept

\(A^c\) is always inside (U). Therefore \(A^c\subseteq U\) is always true.

Step 2

Why this answer is correct

The correct answer is A. \(A^c\subseteq U\). \(A^c\) is always inside (U). Therefore \(A^c\subseteq U\) is always true.

Step 3

Exam Tip

\(A^c\) हमेशा (U) के अंदर ही होता है। इसलिए \(A^c\subseteq U\) हर बार सही है।

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यदि \(A^c=\varnothing\) है, तो (A) किसके बराबर होगा?

If \(A^c=\varnothing\), then (A) is equal to what?

Explanation opens after your attempt
Correct Answer

A. (U)universal set

Step 1

Concept

An empty complement means no element of (U) is outside (A). Therefore (A=U).

Step 2

Why this answer is correct

The correct answer is A. (U) / universal set. An empty complement means no element of (U) is outside (A). Therefore (A=U).

Step 3

Exam Tip

पूरक खाली होने का अर्थ है कि (U) का कोई तत्व (A) से बाहर नहीं है। इसलिए (A=U) होगा।

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यदि \(A^c=U\) है, तो (A) किसके बराबर होगा?

If \(A^c=U\), then (A) is equal to what?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)empty set

Step 1

Concept

If the whole (U) is outside (A), then (A) has no element. Therefore \(A=\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\) / empty set. If the whole (U) is outside (A), then (A) has no element. Therefore \(A=\varnothing\).

Step 3

Exam Tip

यदि पूरा (U) ही (A) के बाहर है, तो (A) में कोई तत्व नहीं है। इसलिए \(A=\varnothing\) होगा।

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वेन आरेख में आयत (U) है और वृत्त (A) है। वृत्त के बाहर लेकिन आयत के अंदर का भाग क्या कहलाता है?

In a Venn diagram, the rectangle is (U) and the circle is (A). What is the part outside the circle but inside the rectangle called?

Explanation opens after your attempt
Correct Answer

A. \(A^c\)complement of (A)

Step 1

Concept

The part inside the rectangle and outside (A) is \(A^c\). In Venn diagrams, do not go outside the boundary of (U).

Step 2

Why this answer is correct

The correct answer is A. \(A^c\) / complement of (A). The part inside the rectangle and outside (A) is \(A^c\). In Venn diagrams, do not go outside the boundary of (U).

Step 3

Exam Tip

आयत के अंदर और (A) के बाहर वाला भाग \(A^c\) होता है। वेन आरेख में (U) की सीमा से बाहर न जाएं।

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\(यदि (U={x:x\) एक वर्ण है\(}) और (A={x:x\) एक स्वर है\(}) है, तो (A^c) क्या दर्शाता है\)?

\(If (U={x:x\) is an alphabet letter\(}) and (A={x:x\) is a vowel\(}), what does (A^c) represent\)?

Explanation opens after your attempt
Correct Answer

A. ({x:x एक व्यंजन है})({x:x is a consonant})

Step 1

Concept

Removing vowels from (U) leaves consonants. Always understand complement with respect to the given (U).

Step 2

Why this answer is correct

The correct answer is A. ({x:x एक व्यंजन है}) / ({x:x is a consonant}). Removing vowels from (U) leaves consonants. Always understand complement with respect to the given (U).

Step 3

Exam Tip

स्वरों को (U) से हटाने पर व्यंजन बचते हैं। पूरक हमेशा दिए गए (U) के संदर्भ में समझें।

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यदि \(U=\{1,2,3,4,5,6,7,8,9,10,11,12\}\) और \(A=\{3,6,9,12\}\) है, तो \(A^c\) क्या होगा?

If \(U=\{1,2,3,4,5,6,7,8,9,10,11,12\}\) and \(A=\{3,6,9,12\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({1,2,4,5,7,8,10,11})

Step 1

Concept

(A) contains multiples of (3), so the remaining elements of (U) form \(A^c\). For speed, cross out (A) from (U).

Step 2

Why this answer is correct

The correct answer is A. ({1,2,4,5,7,8,10,11}). (A) contains multiples of (3), so the remaining elements of (U) form \(A^c\). For speed, cross out (A) from (U).

Step 3

Exam Tip

(A) में (3) के गुणज हैं, इसलिए (U) में बचे हुए तत्व \(A^c\) हैं। जल्दी करने के लिए (U) से (A) को काटें।

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यदि (n(U)=30) और (n\(A^c\)=18) है, तो (n(A)) कितना होगा?

If (n(U)=30) and (n\(A^c\)=18), what is (n(A))?

Explanation opens after your attempt
Correct Answer

A. (12)

Step 1

Concept

(n(A)=n(U)-n\(A^c\)). Therefore (30-18=12) is correct.

Step 2

Why this answer is correct

The correct answer is A. (12). (n(A)=n(U)-n\(A^c\)). Therefore (30-18=12) is correct.

Step 3

Exam Tip

(n(A)=n(U)-n\(A^c\)) होता है। इसलिए (30-18=12) सही है।

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यदि (n(U)=16) और (n(A)=n\(A^c\)) है, तो (n(A)) कितना होगा?

If (n(U)=16) and (n(A)=n\(A^c\)), what is (n(A))?

Explanation opens after your attempt
Correct Answer

A. (8)

Step 1

Concept

(A) and \(A^c\) together form (U), and their counts are equal. Hence \(16\div 2=8\).

Step 2

Why this answer is correct

The correct answer is A. (8). (A) and \(A^c\) together form (U), and their counts are equal. Hence \(16\div 2=8\).

Step 3

Exam Tip

(A) और \(A^c\) मिलकर (U) बनाते हैं और दोनों की संख्या बराबर है। इसलिए \(16\div 2=8\) होगा।

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कौन से दो समुच्चय हमेशा असंबद्ध होते हैं?

Which two sets are always disjoint?

Explanation opens after your attempt
Correct Answer

A. (A) और \(A^c\)(A) and \(A^c\)

Step 1

Concept

\(A\cap A^c=\varnothing\), so (A) and \(A^c\) are always disjoint. This property is clear in a Venn diagram.

Step 2

Why this answer is correct

The correct answer is A. (A) और \(A^c\) / (A) and \(A^c\). \(A\cap A^c=\varnothing\), so (A) and \(A^c\) are always disjoint. This property is clear in a Venn diagram.

Step 3

Exam Tip

\(A\cap A^c=\varnothing\), इसलिए (A) और \(A^c\) हमेशा असंबद्ध होते हैं। यह गुण वेन आरेख में तुरंत दिखता है।

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यदि (n(U)=25) है, तो (n\(A\cup A^c\)) कितना होगा?

If (n(U)=25), what is (n\(A\cup A^c\))?

Explanation opens after your attempt
Correct Answer

A. (25)

Step 1

Concept

\(A\cup A^c=U\). Therefore (n\(A\cup A^c\)=n(U)=25).

Step 2

Why this answer is correct

The correct answer is A. (25). \(A\cup A^c=U\). Therefore (n\(A\cup A^c\)=n(U)=25).

Step 3

Exam Tip

\(A\cup A^c=U\) होता है। इसलिए (n\(A\cup A^c\)=n(U)=25) होगा।

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किसी भी समुच्चय (A) के लिए (n\(A\cap A^c\)) कितना होता है?

For any set (A), what is (n\(A\cap A^c\))?

Explanation opens after your attempt
Correct Answer

A. (0)

Step 1

Concept

\(A\cap A^c=\varnothing\), so it has no element. Hence its cardinality is (0).

Step 2

Why this answer is correct

The correct answer is A. (0). \(A\cap A^c=\varnothing\), so it has no element. Hence its cardinality is (0).

Step 3

Exam Tip

\(A\cap A^c=\varnothing\), इसलिए इसमें कोई तत्व नहीं होता। अतः इसकी संख्या (0) है।

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(U-A) किसके बराबर होता है?

What is (U-A) equal to?

Explanation opens after your attempt
Correct Answer

A. \(A^c\)complement of (A)

Step 1

Concept

(U-A) means removing the elements of (A) from (U). This is the definition of \(A^c\).

Step 2

Why this answer is correct

The correct answer is A. \(A^c\) / complement of (A). (U-A) means removing the elements of (A) from (U). This is the definition of \(A^c\).

Step 3

Exam Tip

(U-A) का अर्थ (U) में से (A) के तत्व हटाना है। यही \(A^c\) की परिभाषा है।

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यदि \(U=\{1,2,3,4,5,6\}\) और \(A=\{1,2,3,4\}\) है, तो (U-A) क्या होगा?

If \(U=\{1,2,3,4,5,6\}\) and \(A=\{1,2,3,4\}\), what is (U-A)?

Explanation opens after your attempt
Correct Answer

A. ({5,6})

Step 1

Concept

\(U-A=A^c\), so after removing the elements of (A), (5) and (6) remain. Link difference and complement with respect to (U).

Step 2

Why this answer is correct

The correct answer is A. ({5,6}). \(U-A=A^c\), so after removing the elements of (A), (5) and (6) remain. Link difference and complement with respect to (U).

Step 3

Exam Tip

\(U-A=A^c\) होता है, इसलिए (A) के तत्व हटाने पर (5) और (6) बचते हैं। अंतर और पूरक को (U) के संदर्भ में जोड़कर देखें।

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यदि \(U=\{1,2,3,4,5,6,7\}\) और \(A=\{2,3,5,7\}\) है, तो \(A^c\) कौन सा है?

If \(U=\{1,2,3,4,5,6,7\}\) and \(A=\{2,3,5,7\}\), which is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({1,4,6})

Step 1

Concept

(A) has (2), (3), (5), (7), so (1), (4), (6) are the complement. Do not add any number outside the given (U).

Step 2

Why this answer is correct

The correct answer is A. ({1,4,6}). (A) has (2), (3), (5), (7), so (1), (4), (6) are the complement. Do not add any number outside the given (U).

Step 3

Exam Tip

(A) में (2), (3), (5), (7) हैं, इसलिए बाकी (1), (4), (6) पूरक हैं। दिए हुए (U) से बाहर कोई संख्या न जोड़ें।

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\(यदि (U={\)सोमवार,मंगलवार,बुधवार,गुरुवार,शुक्रवार,शनिवार,रविवार\(}) और (A={\)शनिवार,रविवार\(}) है, तो (A^c) क्या दर्शाता है\)?

\(If (U={\)Monday,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday\(}) and (A={\)Saturday,Sunday\(}), what does (A^c) represent\)?

Explanation opens after your attempt
Correct Answer

A. ({सोमवार,मंगलवार,बुधवार,गुरुवार,शुक्रवार})weekdays

Step 1

Concept

(A) contains weekend days, so \(A^c\) contains weekdays. The same complement rule applies to word sets also.

Step 2

Why this answer is correct

The correct answer is A. ({सोमवार,मंगलवार,बुधवार,गुरुवार,शुक्रवार\(}) / weekdays. (A) contains weekend days, so (A^c) contains weekdays. The same complement rule applies to word sets also.\)

Step 3

Exam Tip

(A) में सप्ताहांत के दिन हैं, इसलिए \(A^c\) में कार्यदिवस होंगे। शब्दों वाले समुच्चय में भी वही पूरक नियम लगता है।

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इनमें से कौन सा कथन गलत है?

Which of the following statements is false?

Explanation opens after your attempt
Correct Answer

A. \(A\cap A^c=U\)

Step 1

Concept

\(A\cap A^c=\varnothing\), not (U). To identify a false statement, remember the basic properties.

Step 2

Why this answer is correct

The correct answer is A. \(A\cap A^c=U\). \(A\cap A^c=\varnothing\), not (U). To identify a false statement, remember the basic properties.

Step 3

Exam Tip

\(A\cap A^c=\varnothing\) होता है, (U) नहीं। गलत कथन पहचानने में मूल गुणों को याद रखें।

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यदि \(U=\{1,2,3,4,5\}\) और \(A^c={2,5}\) है, तो \(A\cap A^c\) क्या होगा?

If \(U=\{1,2,3,4,5\}\) and \(A^c={2,5}\), what is \(A\cap A^c\)?

Explanation opens after your attempt
Correct Answer

A. \(\varnothing\)empty set

Step 1

Concept

For any (A), \(A\cap A^c=\varnothing\). Here there is no need to find (A) first.

Step 2

Why this answer is correct

The correct answer is A. \(\varnothing\) / empty set. For any (A), \(A\cap A^c=\varnothing\). Here there is no need to find (A) first.

Step 3

Exam Tip

किसी भी (A) के लिए \(A\cap A^c=\varnothing\) होता है। यहां (A) निकालने की भी जरूरत नहीं है।

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यदि \(U=\{1,2,3,4,5\}\) और \(A^c={2,5}\) है, तो \(A\cup A^c\) क्या होगा?

If \(U=\{1,2,3,4,5\}\) and \(A^c={2,5}\), what is \(A\cup A^c\)?

Explanation opens after your attempt
Correct Answer

A. (U)

Step 1

Concept

\(A\cup A^c\) is always (U). Therefore the answer is directly (U).

Step 2

Why this answer is correct

The correct answer is A. (U). \(A\cup A^c\) is always (U). Therefore the answer is directly (U).

Step 3

Exam Tip

\(A\cup A^c\) हमेशा (U) होता है। इसलिए उत्तर सीधे (U) है।

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यदि \(3\in U\) और \(3\notin A\) है, तो कौन सा निष्कर्ष सही है?

If \(3\in U\) and \(3\notin A\), which conclusion is correct?

Explanation opens after your attempt
Correct Answer

A. \(3\in A^c\)

Step 1

Concept

An element in (U) but not in (A) belongs to \(A^c\). This is the basic membership condition of complement.

Step 2

Why this answer is correct

The correct answer is A. \(3\in A^c\). An element in (U) but not in (A) belongs to \(A^c\). This is the basic membership condition of complement.

Step 3

Exam Tip

जो तत्व (U) में है और (A) में नहीं है, वह \(A^c\) में होगा। यह पूरक की मूल सदस्यता शर्त है।

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यदि \(4\in A^c\) है, तो कौन सा कथन सही है?

If \(4\in A^c\), which statement is correct?

Explanation opens after your attempt
Correct Answer

A. \(4\in U\) और \(4\notin A\)\(4\in U\) and \(4\notin A\)

Step 1

Concept

An element of \(A^c\) is always in (U) and not in (A). In such questions, write both conditions together.

Step 2

Why this answer is correct

The correct answer is A. \(4\in U\) और \(4\notin A\) / \(4\in U\) and \(4\notin A\). An element of \(A^c\) is always in (U) and not in (A). In such questions, write both conditions together.

Step 3

Exam Tip

\(A^c\) का तत्व हमेशा (U) में होता है और (A) में नहीं होता। ऐसे प्रश्नों में दोनों शर्तें साथ लिखें।

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यदि \(U={x:x\in\mathbb{N},1\le x\le 5}\) और \(A=\{x:x<4\}\) है, तो \(A^c\) क्या होगा?

If \(U={x:x\in\mathbb{N},1\le x\le 5}\) and \(A=\{x:x<4\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({4,5})

Step 1

Concept

\(U=\{1,2,3,4,5\}\) and \(A=\{1,2,3\}\). Therefore the remaining elements are (4) and (5).

Step 2

Why this answer is correct

The correct answer is A. ({4,5}). \(U=\{1,2,3,4,5\}\) and \(A=\{1,2,3\}\). Therefore the remaining elements are (4) and (5).

Step 3

Exam Tip

\(U=\{1,2,3,4,5\}\) और \(A=\{1,2,3\}\) है। इसलिए बचे हुए तत्व (4) और (5) हैं।

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यदि \(U={x:x\in\mathbb{N},x\le 8}\) और \(A=\{1,3,5,7\}\) है, तो \(A^c\) क्या होगा?

If \(U={x:x\in\mathbb{N},x\le 8}\) and \(A=\{1,3,5,7\}\), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ({2,4,6,8})

Step 1

Concept

\(U=\{1,2,3,4,5,6,7,8\}\), and (A) has odd numbers. The complement contains even numbers.

Step 2

Why this answer is correct

The correct answer is A. ({2,4,6,8}). \(U=\{1,2,3,4,5,6,7,8\}\), and (A) has odd numbers. The complement contains even numbers.

Step 3

Exam Tip

\(U=\{1,2,3,4,5,6,7,8\}\) है और (A) में विषम संख्याएं हैं। पूरक में सम संख्याएं आएंगी।

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यदि (U=[0,10]) और (A=[0,4]) है, तो \(A^c\) क्या होगा?

If (U=[0,10]) and (A=[0,4]), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ((4,10])

Step 1

Concept

(4) is included in (A), so the complement starts after (4). Since (10) is included in (U), ((4,10]) is correct.

Step 2

Why this answer is correct

The correct answer is A. ((4,10]). (4) is included in (A), so the complement starts after (4). Since (10) is included in (U), ((4,10]) is correct.

Step 3

Exam Tip

(A) में (4) शामिल है, इसलिए पूरक (4) के बाद से शुरू होगा। (10) (U) में शामिल है, इसलिए ((4,10]) सही है।

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यदि (U=[-2,3]) और (A=(-1,2]) है, तो \(A^c\) क्या होगा?

If (U=[-2,3]) and (A=(-1,2]), what is \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. ([-2,-1]\cup(2,3])

Step 1

Concept

(-1) is not included in (A), so (-1) is in the complement. (2) is in (A), so the complement starts after (2).

Step 2

Why this answer is correct

The correct answer is A. ([-2,-1]\cup(2,3]). (-1) is not included in (A), so (-1) is in the complement. (2) is in (A), so the complement starts after (2).

Step 3

Exam Tip

(A) में (-1) शामिल नहीं है, इसलिए (-1) पूरक में आएगा। (2) (A) में है, इसलिए पूरक (2) के बाद शुरू होगा।

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किसी कक्षा में (U) सभी विद्यार्थी हैं और (A) क्रिकेट खेलने वाले विद्यार्थी हैं। \(A^c\) क्या दर्शाता है?

In a class, (U) is the set of all students and (A) is the set of students who play cricket. What does \(A^c\) represent?

Explanation opens after your attempt
Correct Answer

A. क्रिकेट न खेलने वाले विद्यार्थीstudents who do not play cricket

Step 1

Concept

\(A^c\) contains the students of (U) who are not in (A). So it is the set of students who do not play cricket.

Step 2

Why this answer is correct

The correct answer is A. क्रिकेट न खेलने वाले विद्यार्थी / students who do not play cricket. \(A^c\) contains the students of (U) who are not in (A). So it is the set of students who do not play cricket.

Step 3

Exam Tip

\(A^c\) में (U) के वे विद्यार्थी होंगे जो (A) में नहीं हैं। इसलिए यह क्रिकेट न खेलने वालों का समुच्चय है।

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एक सर्वे में (n(U)=40) और (n\(A^c\)=15) है। (n(A)) कितना होगा?

In a survey, (n(U)=40) and (n\(A^c\)=15). What is (n(A))?

Explanation opens after your attempt
Correct Answer

A. (25)

Step 1

Concept

(n(A)=n(U)-n\(A^c\)). Therefore (40-15=25).

Step 2

Why this answer is correct

The correct answer is A. (25). (n(A)=n(U)-n\(A^c\)). Therefore (40-15=25).

Step 3

Exam Tip

(n(A)=n(U)-n\(A^c\)) होता है। इसलिए (40-15=25) मिलेगा।

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यदि (A) सार्वत्रिक समुच्चय (U) का वास्तविक उपसमुच्चय है, तो \(A^c\) के बारे में क्या सही है?

If (A) is a proper subset of the universal set (U), what is true about \(A^c\)?

Explanation opens after your attempt
Correct Answer

A. \(A^c\ne\varnothing\)

Step 1

Concept

If (A) is a proper subset, at least one element of (U) is outside (A). Therefore \(A^c\ne\varnothing\).

Step 2

Why this answer is correct

The correct answer is A. \(A^c\ne\varnothing\). If (A) is a proper subset, at least one element of (U) is outside (A). Therefore \(A^c\ne\varnothing\).

Step 3

Exam Tip

वास्तविक उपसमुच्चय होने पर (U) में कम से कम एक तत्व (A) से बाहर होगा। इसलिए \(A^c\ne\varnothing\) है।

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यदि \(A=\{1,2\}\), \(U_1={1,2,3}\) और \(U_2={1,2,3,4}\) हैं, तो (A) का पूरक दोनों में अलग क्यों होगा?

If \(A=\{1,2\}\), \(U_1={1,2,3}\), and \(U_2={1,2,3,4}\), why will the complement of (A) be different in both cases?

Explanation opens after your attempt
Correct Answer

A. क्योंकि सार्वत्रिक समुच्चय बदलता हैbecause the universal set changes

Step 1

Concept

The complement always depends on the given universal set. When (U) changes, \(A^c\) may also change.

Step 2

Why this answer is correct

The correct answer is A. क्योंकि सार्वत्रिक समुच्चय बदलता है / because the universal set changes. The complement always depends on the given universal set. When (U) changes, \(A^c\) may also change.

Step 3

Exam Tip

पूरक हमेशा दिए गए सार्वत्रिक समुच्चय पर निर्भर करता है। (U) बदलने पर \(A^c\) भी बदल सकता है।

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पूरक की जांच करने के लिए कौन सा युग्मित गुण सबसे उपयोगी है?

Which paired property is most useful to check a complement?

Explanation opens after your attempt
Correct Answer

A. \(A\cap A^c=\varnothing\) और \(A\cup A^c=U\)\(A\cap A^c=\varnothing\) and \(A\cup A^c=U\)

Step 1

Concept

For a correct complement, there should be no common element with (A), and both together should form (U). This is the best checking method in exams.

Step 2

Why this answer is correct

The correct answer is A. \(A\cap A^c=\varnothing\) और \(A\cup A^c=U\) / \(A\cap A^c=\varnothing\) and \(A\cup A^c=U\). For a correct complement, there should be no common element with (A), and both together should form (U). This is the best checking method in exams.

Step 3

Exam Tip

सही पूरक के लिए (A) से कोई साझा तत्व नहीं होना चाहिए और दोनों मिलकर (U) बनने चाहिए। यही परीक्षा में सबसे अच्छा जांच तरीका है।

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FAQs

Class 11 Mathematics Quiz FAQs

How many questions are in this quiz?

This level is designed for 50 active questions. Currently 50 questions are available for the selected class and difficulty.

Is there a timer in this quiz?

Yes, the timer uses 40 seconds per question for Easy difficulty and shows the total remaining time on the page.

Can I open each question separately?

Yes, every question has its own SEO-friendly page with answer, explanation and related practice links.