Physics
Assertion (A): An empty test tube placed in water in a beaker with its mouth outside the water surface appears silvery when viewed from a suitable direction.
Reason (R): The substance in water appears silvery due to refraction of light.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Answer
assertion is true but reason is false.
Explanation
Assertion (A) is true. An empty test tube placed in water in a beaker with its mouth outside the water surface appears silvery when viewed from a suitable direction because of the phenomenon of total internal reflection at the air-water interface, which can create a silvery appearance.
Reason (R) is false. Substance in water appears silvery due to the refraction of light, is incorrect. The silvery appearance typically arises due to total internal reflection, not refraction.
Related Questions
Assertion (A): If the angles of the base of a prism are equal, then in the position of minimum deviation, the refracted ray will pass parallely to the base of the prism.
Reason (R): For minimum deviation, angle of incidence is equal to the angle of emergence.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
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Assertion (A): The stars twinkle while the planets do not.
Reason (R): Stars are more distant than the planets.
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- Both A and R are true and R is not the correct explanation of A.
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Assertion (A): Sound waves can travel in vacuum, but light waves cannot.
Reason (R): Light is an electromagnetic wave, but sound is a mechanical wave .
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
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- assertion is true but reason is false.
Assertion (A): When a force retards the motion of a body, the work done by the body is zero.
Reason (R): Work done depends on the angle between force and displacement.
- Both A and R are true.
- Both A and R are false.
- A is false but R is true.
- A is true but R is false.