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Assignment for Class 10 Science Chapter 11 Human Eyes And Colourful World
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 11 Human Eyes And Colourful World in Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Chapter 11 Human Eyes And Colourful World Class 10 Science Assignment
Question. To get line spectrum, the substances are excited in their
(a) solid state
(b) molecular state
(c) gaseous state
(d) atomic state
Answer : D
Question. Sometimes blurred and less sharply defined images are formed. This defect is called
(a) Chromatic aberration
(b) Spherical aberration
(c) Blurred lens
(d) None of the above
Answer : B
Question. A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the sixth colour from the top corresponds to the colour of the sun?
(b) (II)
(c) (III)
(d) (IV)
Answer : B
Question. A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in corresponding colour. Then, which of the following is correct?
(a) The images of all the letters will be in the same place as that on paper
(b) Letter V is raised more
(c) Letter R is raised more
(d) None of the above
Answer : B
Question. The following one is not a primary colour
(a) Yellow
(b) Red
(c) Green
(d) Blue
Answer : A
(b) 30c
(d) 90c
Question. A person cannot see objects clearly which are nearer than 75 cms from his eyes, the disease he suffering from is
(a) Astigmatism
(b) Myopia
(c) Hypermetropia
(d) Presbyopia
Answer : C
Answer : D
Question. A person with a myopic eye cannot see object beyond -1.2m distinctly. The power of the corrective lens used to restore proper vision is
(a) -0.83 D
(b) -0.92 D
(c) +0.21D
(d) +0.91D
Answer : A
Question. Fraunhofer lines in the sun’s spectrum are present because
(a) Vapours of certain elements present in the atmosphere absorb certain colours
(b) The temperature of the sun is very high
(c) The sun does emit certain light
(d) Certain elements present in the sun interfere
Answer : D
Question. When a mirror is rotated an angle the reflected ray moves through double that angle, the instrument based on the above principle is
(a) Periscope
(b) Odometer
(c) Refractometer
(d) Sextant
Answer : D
Question. The splitting of white light into several colours on passing through a glass prism is due to
(a) refraction
(b) reflection
(c) interference
(d) diffraction
Answer : A
Question. At sun rise or at sun set the sun appears to be reddish while at mid-day it looks white. This is because
(a) Scattering due to dust particles and air molecules causes this phenomenon
(b) The sun is cooler at sun rise or at sunset
(c) Refraction causes this phenomenon
(d) Diffraction sends red rays to the earth at these times.
Answer : A
Question. The frequency of light whose wavelength is 5000 Ac is
(a) 15#1013 cycles per second
(b) 5000 cycles per second
(c) 6#1014 cycles per second
(d) 15#1016 cycles per second
Answer : C
a. 0.15m
b. Infinity
c. 100m.
d. 15cm
Answer : B
a. Accommodation
b. None of these
c. Power
d. Adjustment
Answer : A
(a) light is least scattered.
(b) All the colors of the white light are scattered away.
(c) Blue color is scattered the most.
(d) Red color is scattered the most.
Answer : A
Question : 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 the earth.
Answer : B
(a) 1 represents far-sightedness
(c) 3 represents far sightedness
(d) 4 correction for far-sightedness
Answer : A
Question : While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below.
The correct path of the rays has been shown by:
(a) I
(b) II
(c) III
(d) IV
Answer : C
Matching Questions
Question.
Answer : A-s, B-r, p, C-q, D-q
Answer : A-q, B-p, C-r, D-s
Answer : (a) A-s, r, B-r, p, C-q, D-q
Answer : (a) A-t, B-p, C- q, s, D-r
Very Short Answer
Question : Which phenomenon is responsible for making the path of light visible?
Answer : Tyndall effect is responsible for making the path of light visible.
Question : What will the color of the sky be for an astronaut staying in the international space station orbiting the earth?
Answer : For an astronaut staying in the international space station orbiting the Earth the color of the sky will be black because the light reaching it does not scatter.
Short Answer
Question : When white light passes through a glass prism; seven colors namely red, orange, yellow, green, blue, indigo and violet are seen on the white screen. All these colors have different angles of deviation. Explain why?
Answer : Speed of color in a medium depends upon its wavelength. All the colors have different wavelength. The red color has the longest wavelength and violet color has the last wavelength. Therefore, red color has the highest speed in the glass prism and the violet color has the lowest speed in the glass prism. Hence, all colors of white light are refracted by different amounts while passing through the glass prism. Therefore, all the colors have different angles of deviations.
Question : (a) What is hypermetropia?
(b) What are the two causes of the defect of vision?
(c) How can this defect of the eye be corrected? Illustrate your answer by drawing ray diagrams to show the formation of image by
(i) a hypermetropic eye
(ii) a hypermetropic eye corrected with a suitable lens.
Answer : (a) Hypermetropia: It is also called long-sightedness. The person with this eye defect can see far off objects but cannot see nearby objects clearly. The image is formed beyond retina.
(b) Two causes
(i) Focal length of the lens increases
(ii) Eye ball becomes smaller
(c) Correction: It can be corrected by using a convex lens. It is a converging lens which shifts the image of the object on the retina.
Question : What is hypermetropia? State the two causes of hypermetropia. With the help of ray diagram show:
(i) the eye defect hypermetropia.
(ii) correction of hypermetropia by using a lens
Ans. Hypermetropia: Defect of a vision in which a person can see distant objects clearly but cannot see nearby objects clearly.
Causes: (a) Focal length of the eye lens is too large.
(b) Eye ball has become too small.
Long Answer
Question : A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.
(i) Write the name and cause of the phenomenon observed.
(ii) Where else in nature is this phenomenon observed?
(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.
(i) The phenomenon of splitting of white light into seven colors on passing through a glass-prism is called dispersion of light. The dispersion of white light occurs because colors of white light travel at different speeds through the glass prism.
(ii) Formation of rainbow is an example of dispersion of white light in nature.
(iii) The formation of spectrum of seven colors shows that white light is made up of lights of seven different colors mixed together. That is, white light is a mixture of seven colors (or seven colored lights), i.e., red, orange, yellow, green, blue, indigo and violet.
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CBSE Class 10 Science Chapter 11 Human Eyes And Colourful World Assignment
We hope you liked the above assignment for Chapter 11 Human Eyes And Colourful World which has been designed as per the latest syllabus for Class 10 Science released by CBSE. Students of Class 10 should download and practice the above Assignments for Class 10 Science regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 10 Science practice sheet in Pdf. All questions have been designed for Science by looking into the pattern of problems asked in previous year examinations. You can download all Revision notes for Class 10 Science also absolutely free of cost. Lot of MCQ questions for Class 10 Science have also been given in the worksheets and assignments for regular use. All study material for Class 10 Science students have been given on studiestoday. We have also provided lot of Worksheets for Class 10 Science which you can use to further make your self stronger in Science.
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