Human Eye And Colourful World MCQ | Class 10 Science | Chapter 11 | 2024

Last updated on July 14th, 2024 at 05:28 pm

Human Eye And Colourful World MCQ

Below are some of the very important NCERT MCQ Questions of Human Eye And Colourful World Class 10 Science Chapter 11 with Answers. These Human Eye And Colourful World MCQ have been prepared by expert teachers and subject experts based on the latest syllabus and pattern of term 1 and term 2.

We have given these Human Eye And Colourful World MCQ Class 10 Social Science Questions with Answers to help students understand the concept.

MCQ Questions for Class 10 Science Chapter 11 are very important for the latest CBSE term 1 and term 2 pattern. These MCQs are very important for students who want to score high in CBSE Board.

We have put together these NCERT  Questions of Light: Reflection And Refraction  MCQ for Class 10 Social Science Chapter 11 with Answers for the practice on a regular basis to score high in exams. Refer to these MCQs Questions with Answers here along with a detailed explanation.

MCQ 1-25

1. The red colour of the sun at the time of sunrise and sunset is because: 

(a) red colour is least scattered 
(b) blue colour is least scattered 
(c) red colour is most at 
(d) blue colour is more scattered

2. The bluish colour of water in deep sea is due to

(a) the presence of algae and other plants found in water
(b) reflection of the sky in water
(c) scattering of light
(d) absorption of light by the sea

3. At noon, the sun appears white as

(a) light is least scattered
(b) all the colours of the white light are scattered away
(c) blue colour is scattered the most
(d) red colour is scattered the most

4. Which of the statements is correct regarding the propagation of light of different colours of white light in air?

(a) Red light moves the fastest
(b) Blue light moves faster than green light
(c) All the colours of the white light travel with the same speed
(d) Yellow light moves with the mean speed as that of red and the violet light

5. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? 

(a) Dispersion of light
(b) Scattering of light
(c) Total Internal Reflection of light 
(d) Reflection of light from Earth

6. A clear sky appears blue, because

(a) blue light gets absorbed in the atmosphere
(b) Ultraviolet radiations are absorbed in the atmosphere
(c) violet and blue lights get scattered more than the lights of all other colours by the atmosphere
(d) lights of all other colours are scattered more than the violet and blue colour lights by the atmosphere

7. The danger signals installed at the top of fall buildings are red in colour. These can be easily seen from a distance because

(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(c) is absorbed the most by smoke or fog
(d) moves the fastest in the air

8. In which of the following diagrams is the path of a Ray of light passing through a glass prism shown correctly?

9. The sun appears red at sunrise or sunset. Choose the incorrect statements from the following 

(a) light from the sun near the horizon through the layers of air.
(b) light from the sun near the horizon travels the target distance in the earth’s atmosphere reaching our eyes.
(c) Most of the blue light and longer wavelengths are scattered away by the particles.
(d) Most of the blue light and shorter wavelengths are scattered away by the particles.

10. In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray 

(a) is parallel to the incident ray
(b) is along the same direction of incident ray
(c) gets deviation and bend towards the thinner part of the prism
(d) gets deviated and bends towards the thicker part (base) of the prism

11. The sky appears dark to passengers flying at very high altitudes mainly because

(a) Scattering of light is not enough at such heights
(b) There is no atmosphere at great heights
(c) The sue of the molecules is smaller than the wavelength of visible light
(d) The light gets scattered towards the earth

12. Study the following ray diagram 

In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by

(a) y,p,z
(b) x,q,z
(c) p,y,z
(d) p,z,y

13. In the following diagram the correctly marked angles are  

14. The phenomena of light responsible for the working of the human eye is

(a) Reflection
(b) Refraction
(c) Power of accommodation
(d) Persistence of vision

15. When white light passes through the achromatic combination of prism, then what is observed?

(a) Dispersion
(b) Deviation
(c) Dispersion and deviation
(d) None of the above  

16. Who discovered the experiments with glass prism that white light consists of seven colours? 

(a) Newton     
(b) Faraday
(c) Maxwell       
(d) Young

17. The light that refracts most while passing through a prism

(a) Red     
(b) Violet
(c) Indigo     
(d) Yellow

18. The splitting of white light into different colours on passing through a prism is called

(a) Reflection    
(b) Refraction 
(c) Dispersion  
(d) Deviation

19. At noon, the sun appears white as

(a) Blue colour is scattered the most
(b) Red colour is scattered the most
(c) Light is least scattered
(d) All the colours of the white light are scattered away

20. Twinkling of stars is due to

(a) Reflection of light by clouds
(b) Scattering of light by dust particles
(c) Dispersion of light by water drops
(d) Atmospheric refraction of starlight

21. The dispersive power will be maximum for

(a) Flint glass   
(b) Crown glass
(c) Mixture of glass
(d) None of these

22. In the following ray diagram the correctly mark angle are

23. In the following ray diagram the correctly marked angle are   

24. Which ray is least deviated by a prism?

(a) Violet ray
(b) Green ray
(c) Red ray
(d) Yellow ray

25. The dispersive power of prism depends upon:

(a) The shape of the prism
(b) The material of the prism
(c) The angle of prism
(d) The height of the prism

MCQ Answers

1. (a)

The sun appears red at sunrise and sunset because the colour red is the least scattered.

2. (c)

The bluish colour of water in deep sea is due to scattering of light. The fine particles in water scatter mainly blue light having the shortest wavelength.

3. (a)

At noon, the sun is directly overhead and has less air to travel through and thus will be reduced if the distance to be traveled in air is reduced. Less scattering leads to the sun appearing white as only a little of the blue and violet colour is  scattered. 

4. (c)

The white light in air or vaccum travel with the same speed but with different   wavelengths and frequencies as air is not a dispersive medium.

5. (b)

Scattering of light contributes to the reddish appearance of the sun at sunrise or sunset. Near the horizon. Most of the blue light and shorter wavelengths are scattered away by the particles. 

Therefore, the light that reaches our own eyes is of longer wavelengths. The red light has the maximum wavelength. This gives rise to the reddish appearance of the sun.

6. (c)

When sunlight passes through the atmosphere the fine particles in air scatter the blue colour (shorter wavelength) more strongly than red colour. The scattered blue light enters our eyes and the sky appears blue.

7. (b)

Among all the colours, red is scattered the least by smoke or fog. This is because the wavelength of red colour is the largest. Thus, it can be easily seen from a distance. 

Since the wavelength of red light is maximum in the spectrum, it’s penetration power in the air is maximum and so we can see red colour from farther distances. Thus, danger signals use red colour.

8. (b)

incident ray should towards the normal on entering the prism glass is an optically denser medium. Similarly, the emergent ray should bend away from the normal as air is an optically rare medium than glass. path of ray of light passing through the prism is correct in (II).

9. (c)

When most of the blue light and shorter wavelengths are scattered away by the particles then the light that reaches our eyes is of longer wavelength. This gives rise to the reddish appearance of the sun.

10.

In a prism, the ray of light from air into glass bends towards the normal. The ray of light from glass to air bend away from the normal in both cases, when a ray of light passes through a prism, it bends towards the base of the prism.

11. (a)

The scattering of light takes place due to the presence of particles in the atmosphere.  This is because the atmospheric medium is very rare at higher altitudes, the scattering of light that takes at these place is very low due to which the sky appears dark to the passengers flying at very high altitudes. 

12. (c)

It is clear from the ray diagram that: The angle which is formed between the incident ray and the normal is called angle of incidence (p) The angle which is formed between emergent ray and the normal is called angle of emergence (y) The angle which is formed between the emergent ray and incident ray is called angle of deviation Thus, angle of incidence, emergence and deviation is p, y and z respectively.

13. (a)

It is clear from the ray diagram that ∠A, ∠r and ∠D are correctly marked.

∠A represents the angle of prism which is correctly marked.

∠D represents the angle of deviation which is formed between the emergent ray and incident ray is incorrectly marked.

∠r represents the angle of refraction which is formed by the refracted ray with the normal is incorrectly marked.

∠i is the angle formed by the incident ray with the normal is incorrectly marked.

14. (b)

The phenomenon of light responsible for the working of the human eye is refraction.

15. (b)   

When white light passes through a prism, it disperses into band of seven colours. But when two prism are combined in such a way  that sum of angular dispersions of crown glass prism and flint glass prism is zero then such a combination is achromatic combination of prisms.

16. (a)

Isaac Newton discovered the phenomenon of splitting of a beam of white light into its seven constituent colours when passed through a medium of transparent medium. He called this phenomenon as dispersion of light. The order of colours from the lower end of the spectrum (band of 7 colours) was violet (V), indigo (I), blue (B), grey (G), yellow(Y), orange (O) and red (R). 

17. (b)

The light that refracts most while passing through a prism is violet. This is because the violet colour has the smallest wavelength and  according to the the phenomenon of scattering of light. The amount of scattering is inversely proportional to the fourth power of the wavelength.

18. (c)

The splitting of white light into different colours on passing through a prism is called dispersion. When white light passes through a prism, each colour of white light is refracted by a different amount and it splits into its component colours.

19. (c)

At noon, the sun appears white because light is least scattered. This is because at noon, the Sun is overhead and it has less distance to travel through. Since, scattering occurs from dust particles, smoke particles and many other particles in the air. 

It will be reduced in the noon because the distance to be travelled by the sunlight in air is reduced due to which there is least amount of scattering and it appears white.

20. (d)

Twinkling of stars is due to atmospheric refraction of starlight. The refraction of light occurs in a medium of various layers of gradually changing refractive indices. A Star always emits light but the different layers of refractive indices in our atmosphere allows it to seem like a twinkle. When a light enters the earth and hits the atmosphere from a distance, it begins n to refract the light into any layer that reaches.

Hence, the star appears to twinkle.

21. (a)

Refractive Index of Flint Glass (μ=1.65) is relatively higher than refractive Index of Crown Glass (μ=1.51). Since dispersive power is dependent on the refractive Index so for Flint glass dispersive power is maximum.  

22. (d)

∠A represents the angle of a prism while ∠D represents the angle of deviation and both are correctly marked.

An angle of refraction (∠r) is the angle formed by the refracted ray with the normal and is also correctly marked.

But ∠i and ∠e are the angles made by the incident ray with the normal and emergent ray with the normal respectively and thus are incorrectly marked.

23. (a)

∠A is called the angle of prism, angle of incidence, ∠i is the incident angle.

∠i is the angle of incidence, which is the angle between the incident ray and the normal at the point of incidence and is marked correctly.

∠r is the angle of refraction, which is the angle between the refracted ray and the normal at the point of incidence but is not marked correctly.

∠e is the angle of emergence, which is the angle between the emergent ray and the normal at the point of emergence but is wrongly marked here. ∠A is the angle between the two lateral faces of a prism and is correctly marketed.

∠D is the angle of deviation, which is the angle between incident ray and emergent ray and is marked correctly.

24. (c)

The light which has more wavelength will scatter less and will have less dispersion. When white light undergoes dispersion from prism then red colour will deviate least and violet will deviate the most.

25. (b)

The dispersion is the difference in refracting of lights with highest and lowest velocities. Dispersion depends upon the refractive indexes of the two mediums. Thus, depending on the material of the prism.

Very Short Answer Type Questions

1. Why does the sun appear reddish early in the morning?   

2. Why does the sky at noon appear white ?

3. Why do clouds appear white ? Explain.

4. How many characteristic colours are present in the white light?

5. How is the sequence of rainbow colour represented?

6. Name the principle on which a prism forms the image of an object?

7. Name the factor on which the colour of light depends?

8. State the two factors on which the deviation produced by a prism depends.

9. What are the advantages of total reflecting prism over the plane mirror?

10. Under what conditions does a prism produce the angle of minimum deviation?

11. What is atmospheric refraction?

12. What will be the dispersion for the wavelength 2l if for a wavelength l the dispersion of the medium is D?

13. In which direction a ray of light bends while emerging out of a prism?

14. Name the factor on which the colour of light depends? 

15. How many rectangular and triangular surfaces are there in a prism?

16. When white light is passed through a hollow prism what happens during this phenomenon?

Very Short Answer Type Question’s Answers

1.  There is a vacuum in space and hence no particle available for scattering of light. In the absence of scattering, none of the colours from the visible spectrum reach the viewer’s eye and the sky appears dark to the astronaut. 

2. At noon the sun is directly above our head and we get the light rays directly from the sun after traveling the shortest distance without much scattering of any particular colour has the sky appears white

3. The clouds contain dust particles and water molecules of size bigger than the wavelength of visible light, so they scatter all colours of incident white light from sun to the same extent and hence when the scattered light reaches our eyes the clouds are seen white

4. 7 colours

5. The sequence of rainbow colour is represented as VIBGYOR.

6. Refraction of light.   

7. Wavelength of light.

8. The deviation produced by the prism depends upon;

(a) Angle of prism
(b) Refractive index of a medium 

9. The advantages of total reflecting prism over plane mirror is the image is not laterally inverted in case of total reflecting prism as in plane mirror and no multiple reflection takes place in Reflecting prism like that of a plane mirror.   

10. When the angle of incidence is equal to angle of emergence and the angle of refraction at the two sides are equal then the prism produces minimum deviation.

11. Refraction of light caused by the earth’s atmosphere due to change in the refractive indices of different layers in the atmosphere.

12. D/8

13. The light ray emerging out of a prism always bends towards the base of the prism.     

14. Wavelength is the factor on which the colour of light depends.

15. A prism has three rectangular surfaces and two triangular faces inclined at an angle.

16. No dispersion and no deviation takes place.

Assertion-Reason Based MCQ

Code

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.  
3. Assertion is true but reason is false.
4. Assertion is false but reason is true. 

1. Assertion There exist two angles of incidence the same magnitude of deviation (except minimum deviation) by a prism kept in the air.

Reason In a prism kept in air, a ray is incident on the first surface and emerges out of the second surface. Now, if another ray is incident on the second surface (or prism) along the previous emergent ray, then this ray emerges from the first surface along the previous incident ray. This phenomenon is called the principle of reversibility of light.

2. Assertion The sequence of rainbow colour is represented as VIBGYOR.

Reason Formation of VIBGYOR sequence colour is due to the dispersion of white light.

3. Assertion The Sun appears red during sunrise or sunset.   

Reason The scattering of light is inversely proportional to its wavelength.

4. Assertion A beam of white light gives a spectrum on passing through a hollow prism.

Reason Speed of light outside the prism is different from the speed of light inside the glass prism.

Assertion-Reason Based MCQ Answers

1. (1)

When a prism is kept in air, then the two angles of incidence will exist for the same magnitude of  deviation. This is due to the principle of reversibility of light. Thus, both assertion and reason are true and reason is the correct explanation of the assertion.  

2. (1)

We know that the rainbow has seven constituent colours such as Violet, Indigo, Blue, Green, Yellow, Orange and Red. These colours are represented as VIBGYOR. It occurs due to the dispersion of white light i.e., when the white light passes through a glass prism, this phenomenon of splitting of white light into VIBGYOR. Thus, both assertion and reason are true and reason is the correct explanation of the assertion.

3. (1)

We can see the sun and its surroundings appear red during both sunrise and sunset. It happens due to the scattering of light which is inversely proportional to the fourth power of its wavelength. Thus, both assertion and reason are. true and reason is the correct explanation of assertion.

4. (4)

A spectrum is an ordered separation of coloured light rays from red to violet like the rainbow colours. White light or visible light must pass through an object like a prism to produce a spectrum. When light passes through different objects, its speed also changes. Thus, the assertion is fake but the reason is true.

Case-Study Based MCQ

1. Read the passage carefully and answer any four questions.

A prism is a transparent refractive medium bounded by two plane surfaces inclined to each other at a certain angle. The refraction of light through a prism follows the laws of refraction. 

In the prism, refraction takes place on its refracting surface i.e., entrance and exit. The  refraction through a prism is shown in the figure. 

Here, A is the angle of the prism, ∠i is the angle of incidence of the face AB and ∠e is the angle of emergence at another face AC. The incident ray suffers a deviation or bending through an ∠δ due to the refraction through the prism. This angle is called the angle of deviation as shown in the figure:

(i) The angle between the two refracting surfaces of a prism is called:

(a) Angle of prism
(b) Angle of incidence
(c) Angle of deviation
(d) Angle of emergence

(ii) The angle between the incident ray and the emergent ray is called: 

(a) Angle of emergence
(b) Angle Of deviation
(c) Angle of incidence
(d) Angle of the prism

(iii) When a ray is refracted through a prism, then

(a) ∠ i = ∠ δ     
(b) ∠ i = ∠ e + ∠ δ
(c) ∠ δ = ∠ e     
(d) ∠ i > ∠ r

(iv) The angle of deviation depends upon;

(a) Refractive index of the prism 
(b) Angle of incidence
(c) Size of the prism
(d) Both (a) and (b)

(v) The rectangular surfaces of a prism are known as:

(a) Reflecting surfaces
(b) Dispersing surfaces
(c) Refracting surfaces
(d) Scattering surfaces

2. Read the passage carefully and answer any four questions.

Different colours in the white light travel at the same speed in a vacuum for all wavelengths. But in any transparent medium (glass or water), the light of different colours travels with different speeds for different wavelengths. 

This means that the refractive index of a particular material is different for different wavelengths. As there is a difference in their speeds, the different colours bend through different angles. 

The speed of violet colour is maximum and the speed of red colour is minimum in the glass. Hence, red colour deviates the least and violet the most. 

The relationship is – higher the wavelength of a colour of light, smaller is the refractive index and less is the bending of light.

(i) Which of the following statements is correct regarding the propagation of light of different colours of white light in the air?

(a) Red light moves the fastest
(b) Blue light moves faster than green light
(c) All the colours of the white light move at the same speed
(d) Yellow light moves with the mean speed as that of the red and violet light

(ii) Which of the following is the correct order of wavelength?

(a) Red > Green > Yellow
(b) Red > Violet > Green
(c) Yellow > Green > Violet
(d) Red > Yellow > Orange

(iii) Which of the following is the correct order of speed of light in glass?

(a) Red > Green > Blue
(b) Blue > Green > Red
(c) Violet > Red > Green
(d) Green > Red > Blue

(iv) Which colour has the maximum frequency?

(a) Red       
(b) Violet
(c) Blue 
(d) Green

(v) Which of the following is the correct order of:

(a) Red >  Green >  Blue
(b) Blue > Yellow > Orange
(c) Orange > Red > Green
(d) Blue > Green > Violet

3. Read the passage carefully and answer any four questions.

The spreading of light by the air molecules is called the scattering of light. The light having the least wavelength scatters more. The sun appears red at sunrise and at sunset the sky appears blue. It is due to the scattering of light. 

The colour of the scattered light depends on the size of the particles. The amount of scattering of light depends on the wavelength of light. 

When light from the sun enters the earth’s atmosphere, it gets scattered by the dust particles and the air molecules present in the atmosphere. The path of sunlight entering the dark room through a fine hole is seen because of the scattering of the sunlight by dust particles present in its path.

(i) To an astronaut in a spaceship, the colour of the earth appears: 

(a) Red    
(b) Blue
(c) White   
(d) Black

(ii) At the time of sunrise and sunset, the light from the sun has to travel

(a) Longest distance through the atmosphere
(b) Shortest distance through the atmosphere
(c) Double distance of what it travels during the daytime
(d) Half the distance of what it travels during the daytime

(iii) The colour of the sky appears blue due to

(a) Refraction of light through the atmosphere     
(b) Dispersion of light through the air molecules 
(c) Scattering of light by air molecules.
(d) All of the above

(iv) At the time of sunset:

(a) Blue colour is scattered and red colour reaches our eye
(b) Red colour is scattered and blue colour reaches our eye
(c) Green and blue scattered and orange reaches our eye
(d) Yellow colour is scattered and violet reaches our eye

(v) Danger signals are always painted in red. Choose the incorrect statement.

(a) Red light can be seen from the farthest distance
(b) The wavelength of red light is maximum
(c) Scattering of red light is least
(d) Red is the colour of courage and fear

4. Read the passage carefully and answer any four questions.

Atmospheric refraction is the phenomenon of bending of light on passing through the earth’s atmosphere. As we move above the surface of the earth, the density of air goes on decreasing. 

Local conditions like temperature etc. also affect the optical density of the earth’s atmosphere. On account of atmospheric refraction, stars seen appear higher than they actually are. 

Advanced sunrise, delayed sunset, the oval appearance of the sun at sunrise and sunset, twinkling of stars, all can be explained with atmospheric refraction.

(i) Due to atmospheric refraction, the apparent length of the day.

(a) Increases   
(b) Decreases
(c) Remains same
(d) None of the above

(ii) Apparent position of the stars appears raised due to:

(a) Atmospheric refraction
(b) Scattering of light
(c) Dispersion of light
(d) Reflection of light

(iii) The sun appears oval-shaped or flattened due to:

(a) Dispersion
(b) Scattering
(c) Atmospheric refraction
(d) Atmospheric reflection

(iv) Which of the following given statement is incorrect?

(a) Atmospheric refraction explains the non twinkling of planets
(b) Atmospheric refraction explains the twinkling of stars
(c) Atmospheric refraction explains floating images around a bonfire
(d) Atmospheric refraction alone explains the rainbow formation 

(v) In absence of atmosphere, the colour of the sky appears:

(a) Blue   
(b) Black
(c) Red   
(d) Yellow

5. Read the passage carefully and answer any four questions.

Splitting of white light into its seven constituent colours when passed through a glass prism is known as ‘dispersion’. All the colours travel at the same speed when they travel in vacuum. 

But when they pass through a medium, such as a glass prism, the colours bend or refract at different angles, and therefore the speed changes. Red Colour bends the least and violet deviates the most.

(i) A prism PQM (QM as the base) is placed in four different orientations as shown in the figure below. A narrow beam of sunlight is incident on the prism (in all orientations).

(i) In which case, after dispersion, the third colour from the top corresponds to the primary colour Blue?

(a) (i)
(b) (ii)
(c) (iii)
(d) (iv)

(ii) Which of the following statements is correct for the figure below ?

(a) The colours in the order in the order of increasing Wavelength are 1<2<3<4<5<6<7
(b) The colours in the order of increasing frequency are 1<2<3<4<5<6<7
(c) The colours in the order of decreasing speed are 
(d) The colours in the order of decreasing deviation are 1>2>3>4>5>6>7

(iii) Consider statements Sl and S2 for the figure given below 

Sl: The ray of light which emerges out of Prism F will be white light.

S2: The refraction produced by the prism F is equal and opposite to that of Prism E. 

(a) Both Sl and S2 are true and S2 is the correct explanation of Sl.
(b) Both Sl and S2 are true but S2 is not the correct explanation of Sl.
(c) Sl is true but S2 is false.
(d) S2 is true but Sl is false.

(iv) Which of the following statements is incorrect?

(a) In the primary rainbow, red colour is formed on the outside and violet colour on the inside.
(b) A normal human eye cannot clearly see all the objects at different distances.
(c) A beam of white light gives a spectrum on passing through a hollow prism.
(d) All of the above.

(v) Red colour is selected for danger signals because:

(a) Red light has the highest speed among all colours so it reaches our eyes fast.
(b) Since red is the colour of human blood, it is directly associated with danger and courage
(c) Highest frequency of the colour red makes the wave move repeatedly multiple times in a direction.
(d) Red light has the highest wavelength among all colours so it is scattered least

6. White light is a mixture of seven colours is violet, indigo, blue, green, yellow, orange and red. Every colour has its own characteristic wavelength. Different colours with their wavelengths are given below in the table.

The phenomenon of splitting white light into seven colons when it pases through a glass prism is called dispersion of white light.

(i) Name the phenomenon occurring in nature due to dispersion of light.

(ii) Light of two colours A and B pass through a glass prism. ‘A’ deviates more than B from its path of incidence. Which colour has a higher in the prism ?

(iii) Choose the correct option:

(a) Each colour of light travels with the same speeds in a given medium.
(b) Each colour of light travels with different speeds in a given medium.
(c) Only red colour of light travels with fast SFed in a given medium.
(d) All of the above.

(iv) The speed of light depends upon:

(a) Frequency
(b) Wavelength
(c) Density     
(d) None of these

7. An identical prism is stuck to the first prism using a transparent adhesive with the same refractive index as the glass. This is shown in figure. In this figure, draw the path of the ray after it has reached B and until it has passed into the air again.

8. The diagram shows radiation from a lamp passing through a prism.

Which type of radiations are found at P and Q ?

9. Where in nature do you find evidence that white sunlight is made up of different colours?

10. Answer the following questions:

(i) A beam of blue, green and yellow light passes through the earth’s atmosphere. Name the colour which is scattered (a) the most (b) the least 

(ii) Name four colours of the spectrum of white light which have a wavelength longer than blue light.

Answers

1. 

(i) (a) Angle of prism

(ii) (b) Angle of deviation

(iii) (d)  ∠ i  > ∠ r

(iv) (c) Size of the prism

(v) (c) Refracting surfaces 

2. 

(i) (c) All the colours of the white light move at the same speed

(ii) (c) Yellow > Green > Violet

(iii) (b) Blue > Green > Red

(iv) (b) Blue > Yellow > Orange

3. 

(i) (b) Blue

(ii) (a) Longest distance through the atmosphere

(iii) (c) Scattering of light by air molecules.

(iv) (a) Blue colour is scattered and red colour reaches our eye

(v) (d) Red is the colour of courage and fear

4. 

(i) (a) Increases

(ii) (a) Atmospheric refraction

(iii) (c) Atmospheric refraction

(iv) (d) Atmospheric refraction alone explains the rainbow formation  

(v) (b) Black 

5.   

(i) (c) (iii) 

(ii) (b) The colours in the order of increasing frequency are 1 < 2 < 3 < 4 < 5 < 6 < 7     

(iii) (a) Both Sl and S2 are true and S2 is the correct explanation of Sl

(iv) (c) A beam of white light gives a spectrum on passing through a hollow prism  (v) (d) Red light has the highest wavelength among all colours so it is scattered least

6.   

(i) Rainbow.

(ii) Colour B has higher speed than that of colour ‘A’.

(iii) (b) Each colour of light travels with different  speeds in a given medium. 

(iv) (b) Wavelength

7.

8. Infra-red is founded at P and ultraviolet is found at Q

9. Rainbow formation in the sky is the evidence that white sunlight is made up of seven different colours

10.

(i) (a) Blue, (b) Yellow.

(ii) Green, yellow, orange and red light have wavelengths longer than blue light.

Final Words

From the above article, you have practiced Human Eye And Colourful World MCQ of class 10 Science Chapter 10. We hope that the above-mentioned MCQs for term 1 of chapter 10 Human Eye And Colourful World will surely help you in your exam. 

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