Natural Phenomenon MCQ Quiz - Objective Question with Answer for Natural Phenomenon - Download Free PDF

The correct answer is the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Key Points

• The clear sky appears blue because of a phenomenon called Rayleigh scattering.
• In Rayleigh scattering, the shorter wavelengths of light (blue and violet) are scattered more than the longer wavelengths (red, orange, yellow).
• Although violet light is scattered even more than blue light, our eyes are more sensitive to blue light and less sensitive to violet light.
• Additionally, much of the violet light is absorbed by the upper atmosphere, making the blue light more predominant.
• This scattering causes the diffusion of blue light in different directions, making the sky appear blue to our eyes.

 Additional Information

• blue light gets absorbed in the atmosphere
  • This is incorrect because blue light is scattered, not absorbed, by the atmosphere.
• ultraviolet radiations are absorbed in the atmosphere
  • While it is true that ultraviolet (UV) radiation is absorbed by the atmosphere, this does not explain why the sky appears blue.
  • UV radiation is absorbed primarily by the ozone layer and does not contribute to the visible color of the sky.
• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
  • This is incorrect because it is the opposite of what actually happens. Blue and violet light are scattered more than the other colors.

The correct answer is 2 minutes; 2 minutes.

Key Points

• The sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes after the actual sunset.
• This phenomenon occurs due to atmospheric refraction.
• Atmospheric refraction causes the light from the sun to bend as it passes through the Earth's atmosphere.
• This bending of light makes the sun appear to be above the horizon when it is actually below it.
• Hence, we see the sun for a few minutes longer than its actual presence above the horizon.

Additional Information

• Atmospheric Refraction
  • It is the bending of light as it passes through the Earth's atmosphere.
  • This bending occurs because light travels at different speeds in different layers of the atmosphere.
  • The density of the atmosphere changes with altitude, causing the light to bend.
• Sunrise and Sunset
  • Sunrise is the moment when the upper limb of the sun appears on the horizon in the morning.
  • Sunset is the moment when the upper limb of the sun disappears below the horizon in the evening.
• Horizon
  • The horizon is the line where the earth's surface and the sky appear to meet.
  • It is an essential reference point for astronomical observations.
• Visual Effects
  • Due to atmospheric refraction, stars and planets also appear slightly higher than their actual position.
  • Twilight, the time before sunrise and after sunset, is also extended due to this effect.

The correct answer is the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Key Points

• The clear sky appears blue because of a phenomenon called Rayleigh scattering.
• In Rayleigh scattering, the shorter wavelengths of light (blue and violet) are scattered more than the longer wavelengths (red, orange, yellow).
• Although violet light is scattered even more than blue light, our eyes are more sensitive to blue light and less sensitive to violet light.
• Additionally, much of the violet light is absorbed by the upper atmosphere, making the blue light more predominant.
• This scattering causes the diffusion of blue light in different directions, making the sky appear blue to our eyes.

 Additional Information

• blue light gets absorbed in the atmosphere
  • This is incorrect because blue light is scattered, not absorbed, by the atmosphere.
• ultraviolet radiations are absorbed in the atmosphere
  • While it is true that ultraviolet (UV) radiation is absorbed by the atmosphere, this does not explain why the sky appears blue.
  • UV radiation is absorbed primarily by the ozone layer and does not contribute to the visible color of the sky.
• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
  • This is incorrect because it is the opposite of what actually happens. Blue and violet light are scattered more than the other colors.

The correct answer is Scattering of light.

Key Points

• The blue colour of the sky is primarily due to the scattering of sunlight by the molecules in the atmosphere.
• This phenomenon is known as Rayleigh scattering, named after the British scientist Lord Rayleigh.
• Rayleigh scattering is more effective at shorter wavelengths, which is why the blue light (shorter wavelength) is scattered more than other colours.
• The scattered blue light reaches our eyes from all directions, making the sky appear blue during the day.

Additional Information

• Rayleigh Scattering
  • It occurs when the particles causing the scattering are smaller than the wavelength of light.
  • It is inversely proportional to the fourth power of the wavelength, meaning shorter wavelengths are scattered more.
  • This is why blue and violet light are scattered more than red light.
• Mie Scattering
  • It is another type of scattering that occurs with larger particles, such as water droplets and dust.
  • Mie scattering is less dependent on wavelength and is responsible for the white appearance of clouds.
• Atmospheric Refraction
  • It is the bending of light as it passes through the Earth's atmosphere.
  • This phenomenon is responsible for effects such as the apparent shift in the position of stars and the flattening of the sun near the horizon.
• Total Internal Reflection
  • It occurs when light travels through a medium and hits the boundary of another medium at an angle greater than the critical angle, causing it to be reflected entirely within the first medium.
  • This is the principle behind optical fibers and some natural phenomena like the sparkle of diamonds.
• Reflection
  • It is the process by which light bounces off a surface.
  • Reflection is responsible for the visibility of objects and is described by the laws of reflection.

The correct answer is Scattering of light.

Key Points

• The Tyndall effect is a phenomenon where light is scattered by particles in a colloid or in a very fine suspension.
• It is named after the 19th-century physicist John Tyndall, who first studied the effect.
• The scattering of light by the particles causes the light beam to become visible, which is why we can see the path of a beam of sunlight entering a dusty room.
• This effect is most often observed when the diameter of the particles is in the range of 40 to 900 nanometers.

Additional Information

• Colloids
  • A colloid is a mixture where one substance of microscopically dispersed insoluble particles is suspended throughout another substance.
  • Examples include fog, milk, and jelly.
• Rayleigh Scattering
  • It is a phenomenon where particles much smaller than the wavelength of light cause the light to scatter.
  • It explains why the sky appears blue; shorter wavelengths (blue) are scattered more than longer wavelengths (red).
• Mie Scattering
  • This scattering occurs when the particles causing the scattering are of a size comparable to the wavelength of light being scattered.
  • Mie scattering explains the white appearance of clouds, where water droplets scatter all wavelengths of light equally.
• Applications of Tyndall Effect
  • Used in determining the size and density of particles in aerosols.
  • Applied in medical diagnostics, such as in detecting the presence of proteins in urine.

The correct answer is 2 minutes; 2 minutes.

Key Points

• The sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes after the actual sunset.
• This phenomenon occurs due to atmospheric refraction.
• Atmospheric refraction causes the light from the sun to bend as it passes through the Earth's atmosphere.
• This bending of light makes the sun appear to be above the horizon when it is actually below it.
• Hence, we see the sun for a few minutes longer than its actual presence above the horizon.

Additional Information

• Atmospheric Refraction
  • It is the bending of light as it passes through the Earth's atmosphere.
  • This bending occurs because light travels at different speeds in different layers of the atmosphere.
  • The density of the atmosphere changes with altitude, causing the light to bend.
• Sunrise and Sunset
  • Sunrise is the moment when the upper limb of the sun appears on the horizon in the morning.
  • Sunset is the moment when the upper limb of the sun disappears below the horizon in the evening.
• Horizon
  • The horizon is the line where the earth's surface and the sky appear to meet.
  • It is an essential reference point for astronomical observations.
• Visual Effects
  • Due to atmospheric refraction, stars and planets also appear slightly higher than their actual position.
  • Twilight, the time before sunrise and after sunset, is also extended due to this effect.

The correct answer is the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Key Points

• The clear sky appears blue because of a phenomenon called Rayleigh scattering.
• In Rayleigh scattering, the shorter wavelengths of light (blue and violet) are scattered more than the longer wavelengths (red, orange, yellow).
• Although violet light is scattered even more than blue light, our eyes are more sensitive to blue light and less sensitive to violet light.
• Additionally, much of the violet light is absorbed by the upper atmosphere, making the blue light more predominant.
• This scattering causes the diffusion of blue light in different directions, making the sky appear blue to our eyes.

 Additional Information

• blue light gets absorbed in the atmosphere
  • This is incorrect because blue light is scattered, not absorbed, by the atmosphere.
• ultraviolet radiations are absorbed in the atmosphere
  • While it is true that ultraviolet (UV) radiation is absorbed by the atmosphere, this does not explain why the sky appears blue.
  • UV radiation is absorbed primarily by the ozone layer and does not contribute to the visible color of the sky.
• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
  • This is incorrect because it is the opposite of what actually happens. Blue and violet light are scattered more than the other colors.

The correct answer is Diffraction of light.

Key Points

• Diffraction of light is a phenomenon where light waves bend around obstacles or spread out after passing through narrow apertures.
• It occurs with all types of waves, including sound waves, water waves, and electromagnetic waves like light.
• Diffraction is significant when the size of the obstacle or aperture is comparable to the wavelength of the light.
• This bending of light leads to various patterns of light and dark bands, known as diffraction patterns.

Additional Information

• Reflection of light
  • Reflection is the phenomenon where light bounces back after hitting a reflective surface, such as a mirror.
  • The angle of incidence (the angle at which the incoming light hits the surface) is equal to the angle of reflection (the angle at which the light bounces off).
  • This principle is used in various applications including periscopes, telescopes, and everyday mirrors.
• Angle of Refraction
  • The angle of refraction is the angle between the refracted ray and the normal (an imaginary line perpendicular to the surface) at the point of refraction.
  • Refraction occurs when light passes from one medium to another, changing its speed and direction.
  • This phenomenon is utilized in lenses, glasses, and optical instruments.
• Angle of Incidence
  • The angle of incidence is the angle between the incoming light ray and the normal to the surface at the point of incidence.
  • It plays a crucial role in determining how light will reflect or refract when it encounters a surface.

The correct answer is The size of the scattering particles.

Key Points

• The Tyndall effect occurs when light is scattered by particles in its path.
• The color of the scattered light depends on the size of the scattering particles.
• Smaller particles scatter shorter wavelengths of light (blue and violet) more effectively.
• Larger particles scatter longer wavelengths of light (red and orange).
• This is why the sky appears blue during the day and can turn red or orange during sunrise and sunset.

Additional Information

• Tyndall Effect:
  • It is the scattering of light by particles in a colloid or in very fine particles in a suspension.
  • This effect is named after the 19th-century scientist John Tyndall, who first studied the phenomenon.
• Rayleigh Scattering:
  • A special case of the Tyndall effect where the scattering particles are much smaller than the wavelength of light.
  • This explains why the sky appears blue, as shorter wavelengths are scattered more.
• Mie Scattering:
  • Occurs when the particles are larger than the wavelength of light.
  • It is responsible for the white appearance of clouds, as all wavelengths are scattered equally.
• Applications of Tyndall Effect:
  • Used in the study of colloids to determine the size and distribution of particles.
  • Helps in the design of optical instruments and in the field of atmospheric science.

The correct answer is 2 minutes; 2 minutes.

Key Points

• The sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes after the actual sunset.
• This phenomenon occurs due to atmospheric refraction.
• Atmospheric refraction causes the light from the sun to bend as it passes through the Earth's atmosphere.
• This bending of light makes the sun appear to be above the horizon when it is actually below it.
• Hence, we see the sun for a few minutes longer than its actual presence above the horizon.

Additional Information

• Atmospheric Refraction
  • It is the bending of light as it passes through the Earth's atmosphere.
  • This bending occurs because light travels at different speeds in different layers of the atmosphere.
  • The density of the atmosphere changes with altitude, causing the light to bend.
• Sunrise and Sunset
  • Sunrise is the moment when the upper limb of the sun appears on the horizon in the morning.
  • Sunset is the moment when the upper limb of the sun disappears below the horizon in the evening.
• Horizon
  • The horizon is the line where the earth's surface and the sky appear to meet.
  • It is an essential reference point for astronomical observations.
• Visual Effects
  • Due to atmospheric refraction, stars and planets also appear slightly higher than their actual position.
  • Twilight, the time before sunrise and after sunset, is also extended due to this effect.

The correct answer is the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Key Points

• The clear sky appears blue because of a phenomenon called Rayleigh scattering.
• In Rayleigh scattering, the shorter wavelengths of light (blue and violet) are scattered more than the longer wavelengths (red, orange, yellow).
• Although violet light is scattered even more than blue light, our eyes are more sensitive to blue light and less sensitive to violet light.
• Additionally, much of the violet light is absorbed by the upper atmosphere, making the blue light more predominant.
• This scattering causes the diffusion of blue light in different directions, making the sky appear blue to our eyes.

 Additional Information

• blue light gets absorbed in the atmosphere
  • This is incorrect because blue light is scattered, not absorbed, by the atmosphere.
• ultraviolet radiations are absorbed in the atmosphere
  • While it is true that ultraviolet (UV) radiation is absorbed by the atmosphere, this does not explain why the sky appears blue.
  • UV radiation is absorbed primarily by the ozone layer and does not contribute to the visible color of the sky.
• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
  • This is incorrect because it is the opposite of what actually happens. Blue and violet light are scattered more than the other colors.

The correct answer is Scattering of light.

Key Points

• The Tyndall effect is a phenomenon where light is scattered by particles in a colloid or in a very fine suspension.
• It is named after the 19th-century physicist John Tyndall, who first studied the effect.
• The scattering of light by the particles causes the light beam to become visible, which is why we can see the path of a beam of sunlight entering a dusty room.
• This effect is most often observed when the diameter of the particles is in the range of 40 to 900 nanometers.

Additional Information

• Colloids
  • A colloid is a mixture where one substance of microscopically dispersed insoluble particles is suspended throughout another substance.
  • Examples include fog, milk, and jelly.
• Rayleigh Scattering
  • It is a phenomenon where particles much smaller than the wavelength of light cause the light to scatter.
  • It explains why the sky appears blue; shorter wavelengths (blue) are scattered more than longer wavelengths (red).
• Mie Scattering
  • This scattering occurs when the particles causing the scattering are of a size comparable to the wavelength of light being scattered.
  • Mie scattering explains the white appearance of clouds, where water droplets scatter all wavelengths of light equally.
• Applications of Tyndall Effect
  • Used in determining the size and density of particles in aerosols.
  • Applied in medical diagnostics, such as in detecting the presence of proteins in urine.

The correct answer is the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.

Key Points

• The clear sky appears blue because of a phenomenon called Rayleigh scattering.
• In Rayleigh scattering, the shorter wavelengths of light (blue and violet) are scattered more than the longer wavelengths (red, orange, yellow).
• Although violet light is scattered even more than blue light, our eyes are more sensitive to blue light and less sensitive to violet light.
• Additionally, much of the violet light is absorbed by the upper atmosphere, making the blue light more predominant.
• This scattering causes the diffusion of blue light in different directions, making the sky appear blue to our eyes.

 Additional Information

• blue light gets absorbed in the atmosphere
  • This is incorrect because blue light is scattered, not absorbed, by the atmosphere.
• ultraviolet radiations are absorbed in the atmosphere
  • While it is true that ultraviolet (UV) radiation is absorbed by the atmosphere, this does not explain why the sky appears blue.
  • UV radiation is absorbed primarily by the ozone layer and does not contribute to the visible color of the sky.
• light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
  • This is incorrect because it is the opposite of what actually happens. Blue and violet light are scattered more than the other colors.

The correct answer is Scattering of light.

Key Points

• The blue colour of the sky is primarily due to the scattering of sunlight by the molecules in the atmosphere.
• This phenomenon is known as Rayleigh scattering, named after the British scientist Lord Rayleigh.
• Rayleigh scattering is more effective at shorter wavelengths, which is why the blue light (shorter wavelength) is scattered more than other colours.
• The scattered blue light reaches our eyes from all directions, making the sky appear blue during the day.

Additional Information

• Rayleigh Scattering
  • It occurs when the particles causing the scattering are smaller than the wavelength of light.
  • It is inversely proportional to the fourth power of the wavelength, meaning shorter wavelengths are scattered more.
  • This is why blue and violet light are scattered more than red light.
• Mie Scattering
  • It is another type of scattering that occurs with larger particles, such as water droplets and dust.
  • Mie scattering is less dependent on wavelength and is responsible for the white appearance of clouds.
• Atmospheric Refraction
  • It is the bending of light as it passes through the Earth's atmosphere.
  • This phenomenon is responsible for effects such as the apparent shift in the position of stars and the flattening of the sun near the horizon.
• Total Internal Reflection
  • It occurs when light travels through a medium and hits the boundary of another medium at an angle greater than the critical angle, causing it to be reflected entirely within the first medium.
  • This is the principle behind optical fibers and some natural phenomena like the sparkle of diamonds.
• Reflection
  • It is the process by which light bounces off a surface.
  • Reflection is responsible for the visibility of objects and is described by the laws of reflection.