1. A
   $\{1, 2, 3, 4, 5, 6\}$
2. B
   $\{1, 3, 5\}$
3. C
   $\varnothing$
4. D
   $\{2, 4, 6\}$

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1. A
   $\{1, 3, 5\}$
2. B
   $\{1, 2, 3, 4, 5\}$
3. C
   $\{1, 3\}$
4. D
   $\{3, 5\}$

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1. A
   Null set
2. B
   Infinite set
3. C
   Finite set
4. D
   None of these

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1. A
   $\{1, 2, 3\}$
2. B
   $\{3, 4, 5, 6\}$
3. C
   $\{2, 5, 6\}$
4. D
   $\{4, 5, 6\}$

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1. A
   $P$
2. B
   $M$
3. C
   $P \cup M$
4. D
   $P' \cap M$

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1. A
   set of intersecting points of parallel lines
2. B
   set of even prime numbers.
3. C
   Month of an english calendar having less than 30 days.
4. D
   $P=\{x \mid x \in I, -1 < x < 1\}$

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1. A
   Colours of the rainbow
2. B
   Tall trees in the school campus
3. C
   Rich people in the village
4. D
   Easy examples in the book

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1. A
   $\{1, 2, 3, \ldots\}$
2. B
   $\{0, 1, 2, 3, \ldots\}$
3. C
   $\{0\}$
4. D
   $\{\ \}$

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1. A
   $\{i, n, d\}$
2. B
   $\{i, n, d, a\}$
3. C
   $\{i, n, d, i, a\}$
4. D
   $\{n, d, a\}$

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1. A
   $\{1, 2, 3, 4, 5, 7\}$
2. B
   $\{1, 2, 3, 7, 8\}$
3. C
   $\{1, 2, 3, 4, 5, 7, 8\}$
4. D
   $\{3, 4\}$

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