Assertion and Reason Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Assertion and Reason Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Here we are providing assertion reason questions for class 9 science. This article covers assertion reason questions based on Class 9 Science Chapter 1 Matter in Our Surroundings. To check the answer, click on ‘Show Answer’ given below each question. After clicking it will expand.

Directions: In each of the following questions, a statement of Assertion is given, and a corresponding statement of Reason is given just below it. Of the statements, given below, 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.

Q.1.
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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Answer: a

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Q.2.
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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Answer: c

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Q.3.
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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Answer: c

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Q.4.
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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Answer: a

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Q.5.
Assertion : The solids do not diffuse in air.
Reason : The particles are loosely packed in solids.

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Answer: c

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Q.6.
Assertion : The boiling point of water is 100 C.
Reason : The boiling point of water increases at higher altitudes.

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Answer: c

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Q.7.
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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Answer: b

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Q.8.
Assertion : lce floats on water.
Reason : Liquids have lower density than solids.

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Answer: b

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Q.9.
Assertion : Camphor burns with a lot of residue.
Reason : Camphor undergoes sublimation.

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Answer: d

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Q.10.
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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Answer: c

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Q.11.
Assertion : Liquids diffuses more easily as compared to gases.
Reason : Intermolecular forces are greater in liquids than in gases.

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Answer: d

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Q.12.
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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Answer: a

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Q.13.
Assertion : Gases diffuses more easily as compared to liquids.
Reason : Intermolecular forces are greater in solids.

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Answer: b

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Q.14.
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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Answer: d

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Q.15.
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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Answer: c

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