Andhra Pradesh SSC (Class 10) The Human Eye and the Colourful World — practice questions — page 2

Explore 32 free The Human Eye and the Colourful World questions in Andhra Pradesh SSC (Class 10) Science and Technology. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

Showing questions 31–32 of 32.

Why do planets NOT twinkle though stars do?Read the answer and worked solution →The bluish colour scattered toward the sides of a sunbeam is described by:Read the answer and worked solution →

Worked practice questions

Why do planets NOT twinkle though stars do?

Planets are too dim in the standard view
Planets do not emit light
Planets are bigger than the wave-front fluctuations
Planets are inside our atmosphere

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Correct answer: C. Planets are bigger than the wave-front fluctuations

1. Stars are essentially point sources because of their huge distance. 2. Atmospheric refraction shifts the tiny image of a star at random. 3. Planets are closer and appear as extended discs. 4. Random shifts across an extended disc average out. 5. So a planet's overall brightness stays steady, while a star flickers. 6. Hence planets do not twinkle. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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The bluish colour scattered toward the sides of a sunbeam is described by:

Newton's third law
Snell's law by common convention
Bragg's law
Rayleigh's scattering law (1/lambda^4)

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Correct answer: D. Rayleigh's scattering law (1/lambda^4)

1. Lord Rayleigh studied how small particles scatter light. 2. He showed that scattering intensity is inversely proportional to the fourth power of wavelength. 3. Blue light has shorter wavelength than red, so it scatters about 10 times more. 4. This 1/lambda^4 relation is the Rayleigh scattering law. 5. It explains the blue sky and the red sunset. _Source: syllabus Science Ch 11 'Human Eye and the Colourful World'_

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