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Science [2 Mark Questions]

Optics · Tamil Nadu Board STD 10 (Tamil - English Medium). 10 questions.

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[2 Mark Questions]

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10 questions · timed · auto-graded

Question 12 Marks
Why are traffic signals red in colour?
Answer
  • Red light has the highest wavelength.
  • It is scattered by atmospheric particles.
  • So red light is able to travel the longest distance through a fog, rain etc.
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Question 22 Marks
Why does the sky appear blue in colour?
Answer
When sunlight passes through the atmosphere, the blue colour (shorter wavelength) is scattered to a greater extent than the red colour (longer wavelength). This scattering causes the sky to appear blue in colour.
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Question 32 Marks
What are the causes of ‘Myopia’?
Answer
  1. The lengthening of eye ball.
  2. The focal length of eye lens is reduced.
  3. The distance between eye lens and retina increases.
  4. The far point will not be at infinity.
  5. The far point comes closer.
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Question 42 Marks
What is the power of accommodation of the eye?
Answer
  • The ability of the eye lens to focus nearby as well as the distant objects is called the power of accommodation of the eye.
  • This is achieved by changing the focal length of the eye lens with the help of ciliary muscles.
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Question 62 Marks
State Rayleigh’s law of scattering.
Answer
Rayleigh's scattering law states that, "The amount of scattering of light is inversely proportional to the fourth power of its wavelength".
Amount of scattering ' $S^{\prime} \propto \frac{1}{\lambda^4}$
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Question 72 Marks
Define dispersion of light.
Answer
When a beam of white light or composite light is refracted through any transparent media such as glass or water, it is split into its component colours. This phenomenon is called as ‘dispersion of light’.
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Question 82 Marks
Draw a ray diagram to show the image formed by a convex lens when the object is placed between F and 2F.
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Question 92 Marks
State Snell’s law.
Answer
The ratio of the sine of the angle of incidence and sine of the angle of refraction is equal to the ratio of refractive indices of the two media. This law is also known as Snell's law.
$
\frac{\sin i}{\sin r}=\frac{\mu_2}{\mu_1}
$
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Question 102 Marks
What is refractive index?
Answer
Refractive index gives us an idea of how fast or how slow light travels in a medium.
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[2 Mark Questions] - Science STD 10 Questions - Vidyadip