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Science True-False [Phy-1M]

Human Eye and Colourful World · CBSE STD 10 (CBSE - English Medium). 6 questions.

Questions

True-False [Phy-1M]

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6 questions · timed · auto-graded

Question 11 Mark
Scattering of light is inversely proportional to the fourth power of wavelength. [True/ False]
Answer
 True.
Explanation:
Thus,, more light of shorter wavelength is scattered than light of longer wavelength - inversely proportional to the fourth power of the wavelength.
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Question 21 Mark
Looming happens due to total internal reflection. [True/ False]
Answer
 True.
Explanation:
When the incident angle becomes larger, the refracted light will get closer and closer to the interface between the air and the glass. When it is larger than the critical
angle, the light will only be reflected but not refracted. This phenomenon is called total internal reflection.
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Question 31 Mark
Impression of an event stays in the mind for 1/24 of a second. [True/ False]
Answer
 True.
Explanation:
information contained in this frame is remembered by a person, but is not seen. Once it is saved in the memory, at some point it can be used by the brain.
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Question 41 Mark
State whether the following statements are true or false:
  1. The scattering away of red light makes the sky appear blue during the day time.
  2. The scattering away of blue light makes the sun appear red at sunset.
Answer
  1. False.
  2. True.
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Question 51 Mark
State whether the following statement is true or false:
The planets twinkle at night due to atmospheric refraction of light.
Answer
False.
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True-False [Phy-1M] - Science STD 10 Questions - Vidyadip