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Physical Nature of Matter

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Question

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The smallest unit of matter that exists freely in nature is called a _________.

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Solution

The smallest unit of matter that exists freely in nature is called a molecule.

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Fill in the blanks:

(a) Evaporation takes place at___ temperature.

(b) ___process is just the reverse of melting.

(c) ___ is a process that involves the direct conversion of a solid into its vapour on heating.

(d) The temperature at which a solid convert into a liquid is called its___

(e) The smallest unit of matter that exists freely ni nature is called___

(f) Molecules of a substance are always in a state of___ and so they possess ___

(g) Inter-molecular space is maximum in ___less in ___and the least in ___

(h) Inter-molecular force of attraction is maximum in___less in ___and the least in ___

Q. Fill in the blanks:
1. Materials which are attracted by magnets are called ............................. substances.
2. A magnet always comes to rest in the ............................. direction when suspended freely.
3. The regions on a magnet where the attraction power of the magnet is maximum are called ............................. of the magnet.
4. Like poles ............................. and unlike poles ............................. each other.
5. Artificial magnets are made in different shapes such as ............................. and ............................. .
6. Sailors use ............................. to find direction.
7. Paper is not a ............................. .
8. Magnetic poles always exist in ............................. .

Q. Fill in the blanks:

(b) Any matter which has a definite but no definite shape is called a .

Q. Question 22 (i)
Fill in the blanks

(i) A polymer is a chain of many small units joined together which are called ___.

Q. Question 22 (i)
Fill in the blanks

(i) A polymer is a chain of many small units joined together which are called ___.

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