The smell of hot sizzling food reaches even at a distance, due to ____.

Correct! Wrong!

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When food is sizzling hot, it releases vapours of its contents. These vapours diffuse fast and reach us even at some distance.

The molecules in a solid ____.

Correct! Wrong!

The molecules of a solid vibrate about their mean positions, but cannot migrate from one position to another.

Gases expand when ____.

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Gases expand on heating. The particles of gas are far apart and when heated move still apart.

In the process of melting, ____.

Correct! Wrong!

Melting is a process in which solid changes to liquid by absorbing heat.

The particles of a gas possess ____.

Correct! Wrong!

The particles of matter are in constant random motion and possess kinetic energy.

Liquids have fixed volume because ____.

Correct! Wrong!

A liquid has a fixed volume because at a given temperature the space between its molecules is fixed.

Which of the following factors effect evaporation?

Correct! Wrong!

The rate of evaporation depends on the surface area and also temperature.

Choose the correct statement among the following.

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The rate of evaporation increases with increase in temperature. Higher the temperature faster is the rate of evaporation.

When a gas condenses to a liquid, the intermolecular forces of attraction between the molecules ____.

Correct! Wrong!

When the gas condenses into a liquid, the intermolecular forces of attraction between the molecules increases.

Breaking of an iron nail is difficult than to break a chalk, because ____.

Correct! Wrong!

The intermolecular bonding is much stronger in iron than in chalk, hence, chalk can be broken easily.

A diver is easily able to cut through water in a swimming pool.

Correct! Wrong!

A diver is able to cut through water easily, since, there is less intermolecular space between the particles of water.

Which of the following substance cannot diffuse in water?

Correct! Wrong!

Silicon dioxide does not diffuse. Iodine, ink and potassium permanganate diffuse easily in water which can be observed by the change in colour of water.

Which of the following statements is correct?

Correct! Wrong!

Matter can change states when temperature and pressure are altered.

Snowflakes and solid ice differ in ____.

Correct! Wrong!

Snowflakes and solid ice differ in intermolecular bonds. The intermolecular bonds between the water molecules in ice are firm compared to the intermolecular bonds in snowflakes.

The process involved in drying wet clothes is ____.

Correct! Wrong!

The water in wet clothes evaporates while drying.

Which of the following "fizz" the most?

Correct! Wrong!

A soda water bottle kept in sun fizzes most. The movement of particles in gaseous phase increases with increase in temperature.

Gases can fill the entire space as the intermolecular force of attraction is ____.

Correct! Wrong!

Gases can fill the entire space as the intermolecular force of attraction is negligible.

The density is high in ____.

Correct! Wrong!

The density of solids is high due to less intermolecular distance.

Which of the following substances sublime?

Correct! Wrong!

Solid carbon dioxide or dry ice sublimes when exposed to atmosphere.

In the process of freezing ____.

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The process of changing of a liquid to solid by cooling is called freezing.

Solids have definite shape and fixed volume.

Correct! Wrong!

Solids have definite shape and fixed volume.

Which of the following substances can flow easily?

Correct! Wrong!

The density of milk is less than the density of coal tar, blood and shampoo and thus, milk can flow faster than the others.

Gas is same as vapour.

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Gas and vapour differ subtly. Substance which exists in gaseous state naturally is a gas and the gaseous state of a liquid is vapour.

The value of boiling point of water in Kelvin scale is ____.

Correct! Wrong!

Temperature in Kelvin scale = Temperature in Celsius scale + 273 = 100 + 273 = 373 K The value of boiling point of water in Kelvin scale is 373 K.

Kelvin is the CGS unit of temperature.

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Kelvin is a unit of temperature in System International (S.I system).

Latent heat is ____.

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Latent heat is defined as the amount of heat required to change the state of 1 kg of a substance.

When salt is added to water, then its boiling point ____.

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When salt is added to water, the boiling point increases, since, presence of impurities in a substance increases its boiling point.

The particles of a gas can be easily separated.

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The particles of a gas move very fast in a zigzag motion and cannot be easily separated.

Sublimation is change of state directly from ____.

Correct! Wrong!

Sublimation is a process in which, a solid directly changes into gas without changing into liquid when there is a change in temperature.

CBSE Class 9th Science 1 - Matter in Our Surroundings
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