Science Practice Quiz 104

Q1.Why does the clear sky appear blue?

A. Because the atmosphere absorbs all other colours. B. Because fine particles in the air scatter blue light (shorter wavelengths) more strongly than red light. C. Because the sky reflects the blue colour of the oceans. D. Because blue light has the longest wavelength.

Q2.How does the wavelength of red light compare to that of blue light?

A. Red light has a wavelength about 1.8 times shorter than blue light. B. Red light has a wavelength about 1.8 times greater than blue light. C. Red light has the same wavelength as blue light. D. Red light has a wavelength about 0.8 times greater than blue light.

Q3.What would be the appearance of the sky if the Earth had no atmosphere?

A. Blue, similar to Earth's current sky B. White, due to direct sunlight C. Dark, due to absence of scattering D. Green, due to specific gas composition

Q4.Why does the sky appear dark to passengers flying at very high altitudes?

A. Because the air is denser at high altitudes. B. Because there is more pollution at high altitudes. C. Because scattering of light is not prominent at such heights. D. Because the sun's rays are weaker at high altitudes.

Q5.Why are 'danger' signal lights typically red in colour?

A. Red light is the brightest colour. B. Red light is most scattered by fog or smoke. C. Red light is least scattered by fog or smoke, allowing it to be seen at a distance. D. Red light has the shortest wavelength.

Q6.The ability of the eye to focus on both near and distant objects by adjusting its focal length is known as?

A. Myopia B. Accommodation C. Hypermetropia D. Presbyopia

Q7.For a young adult with normal vision, what is the approximate least distance of distinct vision?

A. 2.5 cm B. 25 m C. 2.5 m D. 25 cm

Q8.In the condition of myopia (short-sightedness), where is the image of distant objects focused?

A. On the retina B. Beyond the retina C. Before the retina D. Behind the lens

Q9.Which type of lens is used to correct myopia?

A. Convex lens B. Concave lens C. Cylindrical lens D. Bifocal lens

Q10.In hypermetropia (far-sightedness), where is the image of nearby objects focused?

A. On the retina B. Before the retina C. Beyond the retina D. On the optic nerve

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Science Practice Quiz 104