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Matter In Our Surroundings

Question
CBSEENSC9005665
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What is meant by a point object? Give some examples.

Solution

Whenever the size of the object is much smaller than the distance it moves in a given time interval, the size of the object can be neglected. The objet can be regraded as point object in such cases.

Examples:

(i) A car covering a distance of 10 km can be treated as a point object.

(ii) Earth can be regarded as a point object for studying its motion around the Sun.

Some More Questions From Matter In Our Surroundings Chapter

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

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