CURIOUSITY QUIZ: MATTER IN OUR SURROUNDINGS

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Test Your knowledge on 'Matter in Our Surroundings ' prepared exclusively according to the NCERT science curriculum for Class-9 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button.

Before attempting the quiz, you may find it useful to go through an overview of the topic which is given below:

Overview:

Matter is made up of many small particles which have lot of space among them. These particle are in continuous random motion and, hence, acquire kinetic energy at all temperatures. Matter can exist as solids, liquids or gases depending on the strength of inter-molecular forces between the particles. On supplying heat energy , the particles start vibrating with greater energy. Due to this increased kinetic energy, the particles overcome the mutual force of attraction undergoing a phase change. During melting or vapourization process, the temperature remains constant as the applied heat energy (called the Latent Heat) is utilized to effect a change of phase. On applying Pressure, the particles of matter can be brought close together and the state of matter can be changed. This is the process by which various atmospheric gases like Oxygen, Nitrogen , Carbon dioxide are liquified for use for various purpose in our daily life. The phenomenon of changing of a liquid into its vapour state at any temperature below its boiling point is called evaporation. Evaporation is basically a surface phenomenon. Evaporation produces cooling. The degree of evaporation is affected by various factors such as the exposed surface area, wind speed, humidity , temperature etc.

Now, please attempt the quiz. Good Luck!

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When we dissolve salt in water, the volume of the solution does not increase. This is because :

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The salt is completely dissolved in water forming a solution.

The salt is a soluble substance in water.

The salt particles occupy the empty spaces between the solvent water particles.

The volume of the dissolved salt is negligible compared to the volume of water in which it is dissolved..

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When we open a small perfume bottle at one corner of a room , the scent quickly spreads out in air in all directions . The intermixing of particles of two different kinds of gaseous matter when the particles of one kind fills up the empty spaces of the other due to their random motion is called :

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Diffusion

Osmosis

Dispersion

Suspension

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The kinetic energy of random motion of particles increases with the increase of :

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Temperature

Pressure

Humidity

Windflow sped

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The Pressure exerted by a gas on the walls of a closed container is because :

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The particles collide with the walls of the container constantly exerting a force per unit area of the surface of the walls.

A gas can exert pressure , because it has no fixed volume.

A gas can exert pressure , because its molecules move with very high velocity.

A gas can exert pressure , because it has large internal kinetic energy.

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The burn injury caused to our body due to exposure to steam at 100 °C is more severe than the injury caused to our body with hot water at the same temperature . Why ?

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Steam is actually hotter than the boiling water.

Steam spreads out more quickly affecting greater area of the body.

Steam has more heat energy than water due to its latent heat of vaporisation.

Steam can penetrate into the skin easily producing severe burn injury.

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When we apply heat to ice , it melts without a rise in temperature. Where does this heat energy go ?

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The heat energy increases the thermal vibrational state of the molecules.

The heat energy increases the random motion of the molecules.

The heat energy is manifested in the form of molecular energy.

The heat energy is simply used to change the state of matter from solid to liquid by overcoming the inter-molecular force of attraction.

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A change of state, directly from solid to gas, without passing through the intermediate liquid state is called :

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Evaporation

Sublimation

Condesation

Deposition

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A change of state, directly from gas to solid, without passing through the intermediate liquid state is called :

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Evaporation

Sublimation

Condesation

Deposition

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How are the atmospheric gases generally liquified ?

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By applying pressure

By lowering temperature

Both by applying pressure and lowering temperature

None of the above

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A Pressure Cooker can cook foods faster, because a temperature higher than 100 degree C is achieved within it. This is because of the fact that :

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The boiling Point of a liquid remains constant with Pressure.

The boiling Point of a liquid fluctuates with Pressure.

The boiling Point of a liquid increases with Pressure.

The boiling Point of a liquid decreases with Pressure.

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The phenomenon of change of liquid into vapour state at a temperature below its boiling point is called :

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Boiling

Fusion

Evaporation

Sublimation

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We often spread cloths for getting dried quickly . This is because :

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Evaporation decreases with the increase of surface area.

Evaporation increases with the increase of surface area.

Evaporation remains same with the increase of surface area.

Evaporation fluctuates with the increase of surface area.

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We often put cloths under the fan for getting dried quickly . This is because :

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Evaporation decreases with the increase of wind speed.

Evaporation increases with the increase of wind speed..

Evaporation remains same with the increase of wind speed.

Evaporation fluctuates with the increase of wind speed.

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In summer, we often prefer to drink cold water from an earthen Surai. The basic principle how a Surai keeps cool is that :

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An earthen pot a is bad conductor of heat.

An earthen pot is a good conductor of heat.

Evaporation produces cooling.

Condensation produces cooling.

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What is the Boiling point of water ?

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100 °C

120 °C

108 °C

It can be said only when the ambient Pressure is specified.

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What is the Melting Point of Ice in Kelvin scale ?

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100 K

120 K

273.15 K

373.15 K

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When a solid melts to a liquid at its Melting Point, what happens to its temperature?

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Melting Point increases

Melting Point decreases

Melting Point first increases and then steadily devreases

Melting Point remains the same.

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The amount of heat that is required to change 1 kg of solid into liquid at atmospheric pressure at its melting point is called :

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Melting Point Heat

Latent Heat of Melting

Latent Heat of Vaporization

Latent Heat of Fusion

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The amount of heat that is required to change 1 kg of a liquid into gaseous form at atmospheric pressure at its boiling point is called :

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Melting Point Heat

Latent Heat of Melting

Latent Heat of Vaporization

Latent Heat of Fusion

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What determines the state of a substance (i.e. existence in Solid, Liquid or Gas)?

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Temperature alone

Pressure alone

Both Temperature and Pressure

None of the above

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For a Solid, what is the indication of the strength of the Force of attraction between its particles ?

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Sublimation property

Intermolecular force of attraction

The boiling point of a solid

The melting point of a solid

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Unlike Solids ad Liquids, gases have a high rate of diffusion, i.e. they can get mixed with other gases very fast. What is the reason for this?

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Gases have large intermolecular spaces between their molecules.

Molecules move with very high speeds for gases.

Both the above answers are correct.

Gases don't have fixed volumes and shapes.

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