Question

• Collect the following articles— a pen, a book, a needle and a piece of wooden stick.
• Sketch the shape of the above articles in your notebook by moving a pencil around them.
• Do all these have a definite shape, distinct boundaries and a fixed volume?
• What happens if they are hammered, pulled or dropped?
• Are these capable of diffusing into each other?
• Try compressing them by applying force. Are you able to compress them?

NCERT Class 9th Science Ch 1 Matter in Our Surroundings

Answer 1

Answer:

Articles required-

• a pen,
• a book,
• a needle
• a piece of wooden stick.

Process-

• Collect the following articles— a pen, a book, a needle and a piece of wooden stick.

• Sketch the shape of the above articles in your notebook by moving a pencil around them.

• Do all these have a definite shape, distinct boundaries and a fixed volume?

• What happens if they are hammered, pulled or dropped?

• Are these capable of diffusing into each other?

• Try compressing them by applying force. Are you able to compress them?

observation-

nothing happens to a needle and a book if we hammer them but the others are broken into pieces.

Conclusion-

all these have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid..

Answer 2

The articles that we required are:

a pen,

a book,

a needle

a piece of wooden stick.

Process-

1.Sketch the shape of the above articles in your notebook by moving a pencil around them.

All the sketches are drawn on the notebook by moving a pencil around them.

2.Do all these have a definite shape, distinct boundaries and a fixed volume?

All these have a definite shape, distinct boundaries and fixed volumes.

3.What happens if they are hammered, pulled or dropped?

Are these capable of diffusing into each other?

If we hammer nothing happens to a needle and a book  but the others are broken into pieces.

4.Try compressing them by applying force. Are you able to compress them?

Solids have a tendency to maintain their shape when subjected to outside force.

By compressing the pen and the book will get broken or damaged.But,

wooden stick and needle still remains undamaged.

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