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 Multiple Choice QuestionsShort Answer Type

61.

What are SI units of surface tension and coefficient of viscosity?

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62.

Viscosity of liquids decreases as the temperature rises. Why?

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63.

What are intermolecular forces?

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64.

Name two solids which directly change into vapours on heating.

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65.

Does the volume of a solid change on slight heating?

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66. What are characteristic properties of gases?


Properties of gases:
The gaseous state is the simplest of the three physical states and shows the greatest regularity in behaviour. The chief characteristic properties of gases are:
1. A gas neither possesses a definite volume nor a definite shape.
2. All the parts of a gas or a gaseous mixture have similar composition throughout.

3. Gases can expand indefinitely to fill up all the available space.

4. The molecules or atoms of a gas are in a state of continuous zig-zag motion in all directions.

5. Two or more gases mix swiftly and easily to give a homogeneous mixture.

6. On cooling and applying pressure gases can be liquefied.

7. The gases exert pressure on the walls of the container as a result of collisions of the particles against the walls of the container.

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67.

How are the following properties of a gas measured:
(i) Mass    (ii) Volume?

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68.

How pressure of a gas is determined experimentally?

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 Multiple Choice QuestionsLong Answer Type

69.

What are the units of pressure?

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 Multiple Choice QuestionsShort Answer Type

70.

A manometer is connected to a gas containing bulb. The open arm reads 43.7 cm where the arm connected to the bulb reads 15.6 cm. If the barometric pressure is 743 nm mercury what is the pressure of the gas in a bar?

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