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Q1 (iii). Fill in the blanks in the following

Paper is not a ______ material.

Q1 (iv). Fill in the blanks in the following

In olden days, sailors used to find direction by suspending a piece of ___________.

Q1 (v). Fill in the blanks in the following

A magnet always has __________ poles.

Q2 (i). State whether the following statements are true or false:

A cylindrical magnet has only one pole.

Q2 (ii). State whether the following statements are true or false:

Artificial magnets were discovered in Greece.

Q2 (iii). State whether the following statements are true or false:

Similar poles of a magnet repel each other.

Q2 (iv). State whether the following statements are true or false:

Maximum iron filings stick in the middle of a bar magnet when it is brought near them.

2. State whether the following statements are true or false:

a) Yarn is made from fibres.

b) Spinning is a process of making fibres.

c) Jute is the outer covering of coconut.

d) The process of removing seed from cotton is called ginning.

e) Weaving of yarn makes a piece of fabric.

f) Silk fibre is obtained from the stem of a plant.

g) Polyester is a natural fibre.

Q3. Fill in the blanks:

a) Plant fibres are obtained from_________ and ________ .

b) Animals fibres are __________ and ___________ .

Q1. Correct the following statements and rewrite them in your notebook.

(f) If the petals of a flower are joined together, then the pistil is joined to the petal.

2. Draw (a) a leaf, (b) a taproot and (c) a flower, you have studied for Table 7.3.

 

1. Find the union of each of the following pairs of sets :

(i) X = {1, 3, 5} Y = {1, 2, 3} 

Q1. Find the union of each of the following pairs of sets :

(ii) A = [ a, e, i, o, u} B = {a, b, c}

Q1. Find the union of each of the following pairs of sets :

(iii) A = {x : x is a natural number and multiple of 3}

      B = {x : x is a natural number less than 6}

Q1. Find the union of each of the following pairs of sets :

(iv) A = {x : x is a natural number and 1 < x ≤6 }

      B = {x : x is a natural number and 6 < x < 10 }

Q1. Find the union of each of the following pairs of sets :

(v) A = {1, 2, 3}, B = φ

Let A = { a, b }, B = {a, b, c}. Is A ⊂ B ? What is A ∪ B ?

If A and B are two sets such that A ⊂ B, then what is A ∪ B?

If A = {1, 2, 3, 4}, B = {3, 4, 5, 6}, C = {5, 6, 7, 8 } and D = { 7, 8, 9, 10 }; find 

(i) A ∪ B (ii) A ∪ C (iii) B ∪ C (iv) B ∪ D (v) A ∪ B ∪ C (vi) A ∪ B ∪ D (vii) B ∪ C ∪ D

5. Find the intersection of each pair of sets of question 1 above

(i) X = {1, 3, 5} Y = {1, 2, 3}

(ii) A = [ a, e, i, o, u} B = {a, b, c}

(iii) A = {x : x is a natural number and multiple of 3}     B = {x : x is a natural number less than 6}

 (iv) A = {x : x is a natural number and 1 <x \leq6 }         B = {x : x is a natural number and 6 < x < 10 }

 (v) A = {1, 2, 3},       B = \phi

Q6. If A = { 3, 5, 7, 9, 11 }, B = {7, 9, 11, 13}, C = {11, 13, 15}and D = {15, 17}; find

(i) A \cap B                     (ii) B \cap C   

(iii) A \capC \cap D            (iv) A \cap C 

(v) B \cap D                   (vi) A \cap (B \cup C) 

(vii) A \cap D                 (viii) A \cap (B \cup D) 

(ix) ( A \cap B ) \cap ( B \cup C )  (x) ( A \cup D) \cap ( B \cup C)

Q7. If A = {x : x is a natural number }, B = {x : x is an even natural number} C = {x : x is an odd natural number} and D = {x : x is a prime number }, find

(i) A \cap B 

(ii) A \cap C 

(iii) A \cap D 

(iv) B \cap C 

(v) B \cap D 

(vi) C \cap D

Q8. Which of the following pairs of sets are disjoint

(i) {1, 2, 3, 4} and {x : x is a natural number and 4 \leqx \leq6 }

Q8. Which of the following pairs of sets are disjoint?

(ii) { a, e, i, o, u }     and     { c, d, e, f }

Q8. Which of the following pairs of sets are disjoint

 (iii)  {x : x is an even integer }      and      {x : x is an odd integer}

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