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Science Assertion - Reasoning [Che-1 M]

Is Matter Around Us Pure · CBSE STD 9 (CBSE - English Medium). 4 questions.

Questions

Assertion - Reasoning [Che-1 M]

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4 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: Dust particle in air form aerosol.
Reason: Dust particles form dispersion medium and air is dispersed phase.
Answer
  1. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Explanation:

There are little particles in the atmosphere that are so small and light they can float in air. These particles are called aerosols. They may be small but they have the ability to change climate.

Dispersed phase and dispersion medium are the two main components of a colloid. Dispersed phase is distributed throughout the dispersion medium. The main difference between dispersed phase and dispersed medium is that dispersed phase is a discontinuous phase whereas dispersion medium is a continuous phase.

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Question 21 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 and Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Tyndall effect is an optical property.
Reason: Scattering of beam of light by the colloidal particles is known as Tyndall effect.
Answer
  1. If Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Explanation:

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible.

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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 and Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Colloidal particles do not show Tyndall effect.
Reason: Colloidal solutions are stable and the colloidal particles do not settle down.
Answer
  1. If Assertion is false and Reason is true.

Explanation:

The mixtures in which particle size is smaller do not show tyndall effect.True solution and colloidal solution do not show tyndall effect.

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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 and Reason is true.
  5. If both Assertion and Reason are false.
Assertion: A mixture of acetone and methanol can be separated by fractional distillation.
Reason: The difference between boiling point of acetone and methanol is very less.
Answer
  1. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Explantion:

Mixture of acetone and methanol can be separated by Fractional distillation.

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