What Is This Organism? Chapter 16 Question 1 Art
NCERT Exemplar Solutions Class viii Scientific discipline Chapter sixteen – Free PDF Download
NCERT Exemplar Solution for Class 8 Science Chapter 16 Lite provides you with necessary insights on the type and the level of difficulty of questions that are unremarkably asked in the CBSE Class 8 test and few competitive examinations. Hence information technology is very important for the students to get tuned-in with this NCERT Exemplar Solution. These has a diverseness of questions like multiple choice questions, match the following, fill in the blanks, brusque answer questions, very short respond questions, long reply questions, numerical problems.
Low-cal is an electromagnetic radiations inside a certain portion of the electromagnetic spectrum. In this chapter, the students volition learn virtually the different backdrop of light and their sources. Along with these, they volition exist introduced to the laws of reflection and how a human being eye works or how does an eye sees images. Solve and practice higher-society thinking questions of this chapter from NCERT Exemplar Class 8 Science Chapter sixteen Light.
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Access Answers to NCERT Exemplar Class 8 Science Chapter 16 – Light
Multiple Choice Questions
i. Part of the center which controls the low-cal inbound is called
(a) iris
(b) cornea
(c) lens
(d) retina
Soln:
Answer is (a) iris
Explanation:
Iris is a dark muscular structure exists behind the cornea. Its role is to command the entry of low-cal.
ii. Nosotros can run into a non-luminous object when lite:
(a) emitted past the object falls on the centre.
(b) is reflected from the object towards our eye.
(c) completely passes through the object.
(d) gets completely absorbed past the object.
Soln:
The answer is (b) is reflected from the object towards our center.
three. Low-cal is falling on surface S1, S2, S3 as shown in Fig.16.one.
Surfaces on which the angle of incidence is equal to the angle of reflection is/are
(a) S1 only
(b) S1 and S2 only
(c) S2 and S3
(d) all the three surfaces
Soln:
The answer is (d) all the three surfaces
Caption:
Laws of reflection are always followed irrespective of the surface of the object hence the angle of incidence is equal to the angle of reflection.
4. A tiny mirror Thou is fixed on a piece of cardboard placed on a table. The cardboard is illuminated by light from a bulb. The position of the centre with respect to the position of the seedling is shown in Fig.16.ii every bit A, B, C and D. In which position mirror will exist visible?
a. A
b. B
c. C
d. D
Soln:
Answer is (a) A
Explanation:
In case of A ray of light from A strikes mirror and gets reflected back to brand an angle of incidence and angle of reflection equal.
v. A small hole P is made in a slice of cardboard. The hole is illuminated by a torch equally shown in Fig. 16.iii. The pencil of light coming out of the hole falls on a mirror.
At which betoken should the eye be placed so that the hole can be seen?
(a) A
(b) B
(c) C
(d) D
Soln:
Answer is (a) A
Explanation:
The eye should exist placed at position A because the hole can be seen but when the angle of incidence is equal to the angle of reflection.
6. Two mirrors A and B are placed at right angles to each other as shown in Fig.16.iv.
A ray of lite incident on mirror A at an angle of 250 falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be
(a) 250
(b) 500
(c) 650
(d) 1150
Soln:
Answer is (c) 650
Explanation:
The angle of reflection for the ray reflected from mirror B will be 65° considering reflected ray from mirror A forms incident ray on mirror 6 and and then reflected dorsum by an angle of 65°.
7. Which of the following statements is right regarding rods and cones in the human eye?
(a) Cones are sensitive to dim low-cal.
(b) Cones are sensitive to vivid light.
(c) Rods are sensitive to bright light.
(d) Rods can sense colour.
Soln:
The answer is (b) Cones are sensitive to brilliant light.
Explanation:
Cones are sensitive to vivid low-cal hence they sense the colour whereas rods are sensitive to dim light and they cannot sense colour.
8. In the figure of the human eye (Fig.16.5), the cornea is represented past the letter of the alphabet
(a) A
(b) B
(c) C
(d) D
Soln:
Answer is (c) C
Caption:
- Iris
- Lens
- Cornea
Very Short Reply Questions
9. Proper name the function of the middle which gives colour to the optics
Soln:
Iris the part of the middle which gives colour to the eyes.
ten. Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
Soln:
Persistence of vision is the reason for the blurred vision of Boojho while waving his manus very fast in front of his eyes, observes that his fingers appear blurred.
11. How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other?
Soln:
An infinite number of times a ray of low-cal reflected by ii airplane mirrors placed parallel and facing each other.
12. The bending between the incident ray and the reflected ray is threescore°. What is the value of the bending of incidence?
Soln:
Answer is 30°.
Explanation:
The angle of reflection is equal to the bending of incidence. Since Angle of incident ray+ Angle of reflected ray is lx°.
The angle of incidence = 30°
13. The distance between the object and its image formed by a plane mirror appears to exist 24 cm. What is the altitude between the mirror and the object?
Soln:
The distance will be 12 cm
Explanation:
Object +image formed =24 cm
Object +mirror =12 cm
Brusque Respond Questions
14. What happens to light when it gets dispersed? Requite an case.
Soln:
When the light gets dispersed it is split into its constituent colours. Ex: rainbow.
fifteen. Describe Fig.16.half-dozen showing the position of the plane mirror. Also, label the angle of incidence and bending of reflection on it.
Soln:
16. Look at Fig.16.7. Can the paradigm of the child in it be obtained on a screen?
Soln:
No, the image of the child cannot exist obtained on a screen considering the image is a virtual image.
17. Eyes of the nocturnal birds take large cornea and a large pupil. How does this structure aid them?
Soln:
They can see objects even in the faint light. Equally a large pupil and large cornea allow more light to enter their eyes.
18. What kind of lens is in that location in our optics? Where does it grade the image of an object?
Soln:
Our optics have a convex blazon of lens and the image is formed on the retina.
nineteen. Which part of the eye gets affected if someone is suffering from cataract? How is it treated?
Soln:
If a person is suffering from cataract their centre lens will be cloudy. Cataract tin be treated past replacing the opaque lens past an bogus lens.
Long Answer Questions
twenty. Boojho planned activity to discover an object A through pipes as shown in Fig. 16.8, so that he could see objects which he could not directly encounter.
(a) How many mirrors should he use to see the objects?
(b) Indicate the positions of the mirrors in the figure.
(c) What must be the angle with respect to the incident low-cal at which he should place the mirrors?
(d) Indicate the direction of the rays in the effigy.
(e) If any of the mirrors are removed, will he be able to see the objects?
Soln:
a) Three mirrors should he use to see the objects.
b)
c) 45°
d)
due east) He will not exist able to see the objects.
21. There is a mistake in each of the post-obit ray diagrams given as Fig. 16.nine a, b, and c. Make the necessary correction (s).
Soln:
The Fig. in all the three cases subsequently correction should be as in the given figure
22. Explain the process which enables us to perceive movement in a cartoon film.
Soln:
Carton movie is actually a projection of a static picture. 24 pictures per second are shown in a specific society which gives u.s. the perception of motion.
23. How is the miracle of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope?
Soln:
The kaleidoscope gives a number of images formed by reflection from the mirrors inclined to one another. Designers and artists apply kaleidoscope to get ideas for new patterns to design wallpapers, Jewellery and fabrics.
24. Fig. 16.10 shows the word REST written in two means in forepart of a mirror. Bear witness how the word would appear in the mirror.
Soln:
25. Write down the names of parts of the eye in the bare spaces shown in Fig. sixteen.x.
Soln:
1. Ciliary musculus
ii. Iris
3. Lens
iv. Cornea
5. Retina
half-dozen. Optic Nerve
Important Topics of NCERT Exemplar for Form viii Scientific discipline Affiliate 16 Light
- What makes Things Visible
- Laws of Reflection
- Regular and Diffused Reflection
- Reflected Light can be Reflected Again
- Multiple Images
- Sunlight – White or Coloured
- What is within Our Eyes
- Care of the Eyes
- Visually Challenged Persons can Read and Write
- What is the Braille System?
BYJU'S provides comprehensive study materials, notes, videos, animations, sample papers, and books for CBSE students of all the classes. As role of an overall package, we also go along track of all the progress that each pupil makes. After assessing the situation, regular feedback is given. Nosotros likewise have a responsive support team for clearing all the doubts. Students can raise all their queries on whatsoever subject.
Oft Asked Questions on NCERT Exemplar Solutions for Form eight Science Chapter xvi
How is the phenomenon of reflection used in making a kaleidoscope? What are the applications of a kaleidoscope covered in Affiliate 16 of NCERT Exemplar Solutions for Class 8 Science?
The kaleidoscope gives a number of images formed by reflection from the mirrors inclined to 1 another. Designers and artists utilise kaleidoscopes to get ideas for new patterns to blueprint wallpapers, Jewellery, and fabrics. These concepts are briefly explained in the NCERT Exemplar Solutions for Grade 8 Science Affiliate 16 curated past the experts at BYJU'Southward. The solutions are elaborated in a simple language to get in easier for the students while learning.
What are the important topics covered in Chapter 16 of NCERT Exemplar Solutions for Class 8 Scientific discipline?
The of import topics covered in Affiliate sixteen of NCERT Exemplar Solutions for Grade viii Science –
1. What makes things visible
2. Laws of reflection
3. Regular and diffused reflection
4. Reflected light can be reflected over again
v. Multiple images
6. Sunlight – white or coloured
7. What is inside our optics
viii. Care of the eyes
ix. Visually challenged persons tin read and write
10. What is the braille organisation?
Is the NCERT Exemplar Solutions for Class viii Science Chapter sixteen sufficient for the test training?
The NCERT Exemplar Solutions for Grade viii Science Chapter 16 are designed by the faculty at BYJU'S to aid students ace the exam without fright. The fundamental concepts are explained in the most systematic manner to improve the conviction amongst students. Each and every infinitesimal detail is covered in the NCERT Exemplar Solutions to help students with their exam grooming. The solutions are available in both online and offline mode which can be used past the students based on their requirements.
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