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CBSE Questions for Class 9 Chemistry Matter In Our Surroundings Quiz 4 - MCQExams.com
CBSE
Class 9 Chemistry
Matter In Our Surroundings
Quiz 4
The smell of the deodorant sprayed on one side of the room travels to the other side of the room. This proves that:
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particles of matter have space
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particles of matter are continuously moving
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particles of matter attract each other
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None of the above
Explanation
The particles of matter are continuously moving. This helps the scented particles to move from one side of the room to the other.
One small crystal of potassium permanganate can colour large volume of water. This proves that ____________.
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matter is made up of wave
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matter is made up of tiny particles
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matter is made up of large particles
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matter cannot be divided further
Explanation
This experiment proves that matter is made up of tiny particles which spread through the solution making it coloured.
Hence, the correct option is $$\text{B}$$.
Which of the following activity proves that particles of matter have space between them?
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Dissolution of sugar into water
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Dilution of potassium permanganate solution
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Breaking the stream of water
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None of the above
Explanation
The dissolution of sugar into water proves that particles of matter have space between them as the sugar particles get trapped in the molecules of water.
Hence the correct option is A.
The smell of hot sizzling food reaches you several meters away, but to get the smell of the cold food you have to go close. Which property of matter does this activity show?
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Particles of matter have space
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Energy of particles of matter increases with increase in temperature
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Particles of matter attract each other
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None of the above
Explanation
Particles of matter are continuously moving from one end to another, thereby transferring smell from one place to another.
The reason why the smell of hot sizzling food goes farther than cold food is because the kinetic energy of the particles of matter increases with the increase in temperature. So, particles in the smell of hot food have a higher kinetic energy and hence, move farther than those of cold food.
When sugar is dissolved in water, the level of water _________.
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increases
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decreases
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remains same
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none of the above
Explanation
The level of water remains same as the sugar particles gets into the spaces between water molecules therefore the level of water remains same.
Particles of gaseous matter are ___________.
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stationary
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vibrating
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continuously moving
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rotating about an axis
Explanation
Particles of gaseous matter are continuously moving.
For example, the smell of deodorant travels in the whole room if it is used on one side of the room.
Hence, the correct option is C.
When salt is dissolved in water _______________.
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the particles of water get into the spaces between particles of salt
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the particles of salt get into the spaces between particles of water
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the particles of salt sit on the top of particles of water
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the particles of water sit on the top of particles of salt
Explanation
When salt is dissolved in water, the particles of salt get into the spaces between particles of water and start dissolving and disappear.
Hence, the correct option is B.
What happens when ink is dropped in water?
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It evenly spreads in all directions in water
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It spreads only in boundary of water
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It settles at the bottom of the container
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None of the above
Explanation
When ink is dropped in water, it evenly spreads in the water
due to the principle of diffusion.
This happens because
water as well as the ink particles (molecules) are in continuous random motion.
Hence, the correct option is A.
Which of the following is not a property of particles of matter?
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The particles of matter are extremely small.
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The particles of matter have spaces between them.
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The particles of matter are in stationary state.
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The particles of matter attract each other.
Explanation
The particles of matter are continuously moving. Therefore, option (C) is incorrect.
Gases are liquefied under ______.
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low temperature and low pressure
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high pressure and low temperature
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high temperature and high pressure
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None of these
Explanation
Gases are liquefied under high pressure as it helps in bringing the particles closer and low temperature reduces kinetic energy thereby keeping the particles again near to each other and it results in forming liquid.
Hence, option $$B$$ is correct.
Evaporation occurs at _______ temperature.
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high
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low
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all
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None of the above
Explanation
Evaporation does not need any particular temperature, it happens at all temperature.
The amount of energy required to change $$1\ kg$$ of a solid into liquid at atmospheric pressure at its melting point is known as _______________.
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latent heat of fusion
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latent heat of boiling
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latent heat of freezing
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melting energy
Explanation
The amount of energy required to change $$1\ kg$$ of a solid into liquid at atmospheric pressure at its melting point is known as latent heat of fusion.
Hence option A is correct.
Which of the following is a surface phenomenon?
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Boiling
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Evaporation
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Dilution
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None of the above
Explanation
$$Boiling$$ is a bulk phenomenon because all molecules gain energy on heating.
$$Evaporation$$ is a surface phenomenon as the molecules of the surface gets sufficient energy to overcome the force of attraction which will help in converting to the vapour phase.
$$Dilution$$ is also a bulk phenomenon as the volume of solution increases throughout the bulk of the solution.
So, the correct answer is (B).
The smell of food transfers across the room due to ____________.
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high speed of particles
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more space between particles
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intermixing of particles and their continuous motion
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None of the above
Explanation
The smell of food is nothing but the molecules of food present in the gaseous state. Since these particles intermix and are in continuous motion, they spread across the room through the air.
In which case the rate of evaporation is higher?
(1) A test tube filled with water.
(2) China dish filled with water.
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1
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2
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Both 1 and 2 have same rate
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Data insufficient
Explanation
The rate of evaporation increases with surface area. The china dish offers a greater surface area, thus, exposing more particles to the atmosphere for evaporation. As a result, the rate of evaporation will be higher for the 2nd case.
The diagram given shows a piston fitted in a cylinder. The most suitable inference that can be drawn from it is that _____________.
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the piston is smooth
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the particles can be compressed or brought closer by applying pressure
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the handle of piston is long
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None of the above
Explanation
We can see from the diagram that the particles comes closer as we push the piston down i.e. by applying pressure on the particles.
The rate of evaporation does not depends on:
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surface area
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wind speed
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humidity
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type of particles
Explanation
The rate of evaporation does not depend on the type of particles because it completely depends upon the surface area of the liquid if the surface area is large evaporation will be maximum.
Evaporation also depends upon wind speed, if the wind is flowing at a higher speed, then the rate of evaporation increases.
The same will be applied in the case of humidity. Humidity decreases the rate of evaporation.
Therefore, the correct option is $$D$$.
On heating, temperature _______, particles __________energy, intermolecular space ___________ and force of attraction ____________.
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falls, lose, increases, decreases
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rises, gain, increases, decreases
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falls, lose, decreases, increases
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rises, gain, decreases, increases
Explanation
On heating, the temperature rises, particles gain energy. As the kinetic energy increases, intermolecular space increases as they get separated from each other and the force of attraction decreases as the particles go far away from each other.
Which of the following is a bulk phenomenon?
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Boiling
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Evaporation
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Adsorption
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None of the above
Explanation
In boiling, all particles get energy when they heated.
Evaporation takes place on the surface. it is a surface phenomenon.
Adsorption also takes place on the surface. It is also a surface phenomenon.
So the correct answer is option A.
The kinetic energy is proportional to temperature, thus evaporation:
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proceeds slowly at higher temperatures
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stops
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proceeds quickly at higher temperatures
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does not occur at all
Explanation
For molecules of a liquid to evaporate, they must be located near the surface, they have to be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces. When only a small proportion of the molecules meet these criteria, the rate of evaporation is low. Since the kinetic energy of a molecule is proportional to its temperature, evaporation proceeds more quickly at higher temperatures.
Why does perspiration leave a cooling effect on our body?
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The sweat particles absorb heat from the body and get converted into vapour, thereby reducing its temperature
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The sweat particles release energy into the atmosphere and the temperature of the surroundings decrease.
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The sweat particles absorb energy from the body and get converted into vapour, thereby increasing the temperature.
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None of the above
Explanation
It happens due to evaporative cooling. The sweat gets vaporized from the skin into the atmosphere, by absorbing heat from the body. Thus the body cools down as it loses heat.
Select the characteristics of particles of matter.
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There is space between the particles of matter
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The particles of matter are continuously moving about their mean position
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The particles of matter attract each other
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All of these
Explanation
Space exists between the particles of matter.
The particles of matter are continuously moving about their mean position.
The particles of matter attract each other due to intermolecular forces of attraction. Hence, all are the characteristics of matter and, so option D is correct.
The force of attraction among the constituent particles is ________ in solids, ________ in liquids and __________ in gases.
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weak, very weak, very high
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weak, weak, very weak
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very high, weak, very weak
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very high, very weak, high
Explanation
The force of attraction among the constituent particles is $$\underline {very\ high}$$ in solids, $$\underline {weak}$$ in liquids and $$\underline {very\ weak}$$ in gases. So, there are more spaces between the particles of gases, lesser between those of liquids, and least in solids. This is responsible for the respective properties of solids, liquids, and gases.
On decreasing the surface area, the rate of evaporation _________.
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Increases
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Decreases
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Remains same
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Data insufficient
Explanation
On decreasing the surface area, fewer particles are exposed to the atmosphere. So the rate of evaporation decreases.
The particles in solid are ________ packed, in liquid are ________ packed and in gas ___________ packed.
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very tightly, less loosely, very loosely
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less loosely, very loosely, very tightly
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very loosely, very tightly, less loosely
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tightly, tightly, tightly
Explanation
1. In solid atoms are very tightly packed because atoms are very close to each other.
2. Liquids have the arrangement of the atoms looser than that of in solid.
3. In gases, atoms are very loosely packed because of the high kinetic energy of atoms in the gas phase.
Hence, option A is correct.
On increasing the temperature, the rate of evaporation _________.
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increases
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decreases
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remains same
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Data insufficient
Explanation
On the increasing temperature, the energy of particles increases, therefore, it is easy to convert to vapor phase as compared to particles that have less or no energy. Hence the rate of evaporation increases with increasing temperature.
Option $$A$$ is correct.
As the level of humidity decreases, the rate of evaporation __________.
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increases
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decreases
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remains same
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Data insufficient
During hot sunny day, people sprinkle water on the roof because:
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they have more water to sprinkle
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water is cheapest thing available
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it has high latent heat of vapourisation
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None of the above
Explanation
People sprinkle water on the rooftop during sunny days as water has a high latent heat of vaporisation so it will absorb more heat and make the rooftop cool.
Option $$C$$ is correct.
Evaporation is indirectly proportional to ___________.
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temperature
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surface area
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humidity
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wind speed
Explanation
Humidity is the amount of water vapour present in the air. The air around us cannot hold more than a definite amount of water vapour at a given temperature. If the amount of water in the air is already high, the rate of evaporation decreases. Hence, it is indirectly proportional to humidity.
Spreading of smell proves that _____________.
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matter is made up of small particles
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the particles in matter are in motion
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Both A and B
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None of above
Explanation
When we use perfume, tiny particles of air collide with tiny particles of perfume which is liquid. The particles of perfume spread in air due to these collisions. Hence, we can feel the smell of perfume. Spreading of smell proves that matter is made up of small particles moving randomly.
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