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Science Assertion - Reasoning [Che-1 M]

Matter in Our Surroundings · CBSE STD 9 (CBSE - English Medium). 5 questions.

Questions

Assertion - Reasoning [Che-1 M]

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5 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
  2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  3. Assertion is true but the Reason is false.
  4. The statement of the Assertion is false but the Reason is true.
Assertion: We feel more cold after taking bath with hot water.
Reason: Evaporation of hot water takes place faster which causes cooling.
Answer
  1. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Explanation:

We feel cold after taking a hot water bath because our bodies get used to the warmth of the water and once you get out, your body is no longer used to the normal air that you usually would be fine with.

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Question 21 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
  2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  3. Assertion is true but the Reason is false.
  4. The statement of the Assertion is false but the Reason is true.
Assertion: Molten ionic solid conducts electricity.
Reason: On melting ions become free to move.
Answer
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

Explanation:

In solid state, ions are held together by strong electrostatic forces and are not free to move about within the solid. Hence, ionic solids do not conduct electricity in solid state. However, in molten state or in solution form, the ions are free to move and can conduct electricity.

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Question 31 Mark
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Mark the correct choice as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: The process of diffusion is always followed by effusion.
Reason: Both diffusion and effusion deal with spreading of gas.
Answer
  1. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Explanation:

Gaseous particles tend to undergo diffusion because they have kinetic energy. Diffusion is faster at higher temperatures because the gas molecules have greater kinetic energy. Effusion refers to the movement of gas particles through a small hole.

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Question 41 Mark
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Mark the correct choice as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Liquids diffuse less easily as compared to gases.
Reason: Intermolecular forces are greater in gases.
Answer
  1. If Assertion is true but Reason is false.

Explanation:

Gases have very less intermolecular forces of attraction and hence the space between the particles is very low. So, they have high random motion and diffuse in a faster rate compared to solids and liquids.

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Question 51 Mark
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Mark the correct choice as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Camphor disappears without leaving any residue.
Reason: Camphor undergoes sublimation.
Answer
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Explanation:

The substance undergoing sublimation reaction is known as a sublimating substance. Camphor is a solid and it directly gets converted into gaseous state without going into the liquid state. Therefore, it does not leave any residue behind.

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Assertion - Reasoning [Che-1 M] - Science STD 9 Questions - Vidyadip