Assertion and Reason Questions for CBSE Class 9 Science Chapter 1 Matter in Our Surroundings
Here you will find assertion reason questions for class 9 science. In this article, we are providing assertion reason questions for class 9 science Chapter 1 Matter in Our Surroundings.
Directions: In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements, mark the correct answer as
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true
Question 1.
Assertion: A particle of gas intermixes with each other.
Reason: The intermixing of particles of two different types of matter on their own is called diffusion.
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Ans. bQuestion 2.
Assertion: Heat energy when supplied to the solid, it starts melting.
Reason: Solid particles take up the heat and helps in melting or fusion.
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Ans. aQuestion 3.
Assertion: A gas exerts pressure on the walls of the container.
Reason: Rate of diffusion of gases is more than that of liquids.
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Ans. bQuestion 4.
Assertion: Water can exist in all the three states- solid, liquid and gases.
Reason: Water has high boiling point.
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Ans. bQuestion 5.
Assertion: We prefer to wear cotton clothes during summer.
Reason: Cotton clothes are good absorber of water.
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Ans. aQuestion 6.
Assertion: Naphthalene ball disappears with time without leaving any solid residue.
Reason: Naphthalene ball gets converted into vapours due to evaporation.
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Ans. cQuestion 7.
Assertion: The rate of diffusion of solids is higher than that of liquids.
Reason: In liquid state, particles move freely and have greater space between each other as compared to solid state.
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Ans. dQuestion 8.
Assertion: Matter around us exists in three different states- solid, liquid and gas.
Reason: These states of matter arise due to the variation in the characteristics of the particles of matter.
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Ans. aQuestion 9.
Assertion: During evaporation of liquid the temperature of the liquid remains unaftected.
Reason: Kinetic energy of the molecules is directly proportional to absolute temperature.
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Ans. dQuestion 10.
Assertion: The rate of diffusion of liquids is more than solids.
Reason: The intermolecular force of attraction is more in solids than liquids.
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Ans. aQuestion 11.
Assertion: On applying pressure, liquids convert into gases.
Reason: On applying pressure, intermolecular space decreases
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Ans. dQuestion 12.
Assertion: The rate of evaporation of water in a plate is higher than that in a cup.
Reason: The rate of evaporation decreases will increase in humidity.
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Ans. bQuestion 13.
Assertion: It is easier to cook food at a hill.
Reason: The boiling point of water increases at hills.
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Ans. cQuestion 14.
Assertion: The intermolecular forces in solid state are stronger than those in the liquid state.
Reason: The space between the particles of matter is called intermolecular space.
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Ans. bQuestion 15.
Assertion: A rubber band can change its shape on stretching.
Reason: A rubber band can change its shape on stretching when the temperature becomes high.
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Ans. cQuestion 16.
Assertion: When a solid melts, its temperature remains the same.
Reason: The heat gets used up in changing the state by overcoming the forces of attraction between the particles.
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Ans. aQuestion 17.
Assertion: Ice floats on water.
Reason: Liquids have lower density than solids.
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Ans. bQuestion 18.
Assertion: Gases exert pressure on the walls of the container.
Reason: The intermolecular force of attraction is very strong in gases.
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Ans. cQuestion 19.
Assertion: Steam is better the boiling water for heating purposes.
Reason: Steam contains more heat in the form of latent heat than boiling water.
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Ans. aQuestion 20.
Assertion: Camphor burns with a lot of residue.
Reason: Camphor undergoes sublimation.
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Ans. dQuestion 21.
Assertion: There is a change in the temperature of the substance when there it undergoes a change in state through it is still being heated.
Reason: The heat supplied is either absorbed as a latent heat of fusion or a latent heat of vapourisation.
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Ans. dQuestion 22.
Assertion: The conversion of a solid directly into a gas is known as sublimation.
Reason: Naphthelene does not leave residue when kept open for sometime.
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Ans. bQuestion 23.
Assertion: The solids do not diffuse in air.
Reason: The particles are loosely packed in solids.
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Ans. cQuestion 24.
Assertion: Liquids diffuses more easily as compared to gases.
Reason: Intermolecular forces are greater in liquids than in gases.
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Ans. dQuestion 25.
Assertion: Gases diffuses more easily as compared to liquids.
Reason: Intermolecular forces are greater in solids.
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Ans. bQuestion 26.
Assertion: The rate of evaporation increases with increase in temperature.
Reason: Increase in temperature decreases the kinetic energy of the particles.
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Ans. cQuestion 27.
Assertion: When Sugar and Salt are kept in a container, they take the shape of the container.
Reason: Sugar is liquid.
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Ans. cQuestion 28.
Assertion: A gas can easily be compressed by applying pressure.
Reason: Since the inter-particle spaces between gases are very large, they can decrease by applying pressure.
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Ans. aQuestion 29.
Assertion: It is easier to cook food at sea level as compared to higher altitudes.
Reason: The boiling point of water increases at high altitudes.
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Ans. cQuestion 30.
Assertion: The boiling point of water is 1000C.
Reason: The boiling point of water increases at higher altitudes.
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