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11. Which of the following colors is not a primary color? (NTSE Madhya Pradesh, Stage-I, 2015-16)
White
Green
Red
Blue
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12. The refractive index of glass is maximum for (NTSE Uttar Pradesh, Stage-I, 2015-16)
Red color
Yellow color
Violet color
Green color
13. A person can see clearly only the objects situated in the range of 50 cm to 300 cm. He went to an Optometrist who prescribed him a lens of certain power to increase the maximum distance of his vision to infinity, i.e. it corrected the near - sightedness. However, upon using the prescribed lens the person discovered that the near point of his vision has shifted from 50 em to a distance 'd'. What is the value of d? (NTSE Stage-II,2015-16)
60 cm
100 cm
40 cm
500 cm
14. Mirages are formed due to the natural phenomena a. Earth's terrestrial heating b. Reflection of light c. Refraction of light d. Diffraction of light e. Total internal reflection of light (NTSE Karnataka, Stage-I, 2016-17)
a, c and e
a, band d
b, c and d
c, d and e
15. When white light is passed through an upside down (inverted) prism then (NTSE Maharashtra, Stage-I, 2016-17)
White light is obtained
Spectrum is obtained with violet colour undergoing maximum deviation and red colour undergoing minimum deviation
Spectrum is obtained with red colour undergoing maximum deviation and violet colour undergoing minimum deviation
Light gets blocked
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