Class 6 Science Chapter 11 Light, Shadows and Reflections (পোহৰ , ছাঁ আৰু প্ৰতিফলন)

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Class 6 Science Chapter 11 Light, Shadows and Reflections (পোহৰ , ছাঁ আৰু প্ৰতিফলন) answer to each chapter is provided in the list so that you can easily browse throughout different chapter Assam Board As Per New Syllabus Class 6 Science Chapter 11 Light, Shadows and Reflections (পোহৰ , ছাঁ আৰু প্ৰতিফলন) and select needs one.

SEBA Class 6 Science Chapter 11 Light, Shadows and Reflections (পোহৰ , ছাঁ আৰু প্ৰতিফলন)

Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Class 6 Science Chapter 11 Light, Shadows and Reflections (পোহৰ , ছাঁ আৰু প্ৰতিফলন) Solutions for All Subject, You can practice these here…

Light, Shadows and Reflections [পোহৰ , ছাঁ আৰু প্ৰতিফলন]

Chapter: 11

Exercises

Q.1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

OWS  AKE  OPAQ  UEO   BJEC   TSM   SHAD

Ans: OPAQ  UEO  BJEC  TSM  AKE  SHAD OWS 

Q.2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non- luminous:

Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polyethene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon. 

Ans: (i) Opaque: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red hot iron, an um- brella, a lighted fluorescent tube, a wall, a sheet of carbon pa- per, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, firefly, moon. 

(ii) Transparent: Air, water, a sheet of plane glass, a sheet of cellophane. 

(iii) Translucent: A sheet of polythene, smoke, fog. 

(a) Luminous: A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, kerosene stove, sun, firefly. 

(b) Non-luminous: Air, water, a piece of rock, a sheet of aluminium. a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cello- phane, a wire mesh, moon.

Q.3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way? 

Ans: Yes, we can think of a cylinder which would give a circular shadow if held in one way and a rectangular shadow if held in another way. 

Q.4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror? 

Ans: No, because there is no light in the room and hence no reflection of light will occur and no image will be formed.

Additional Questions & Answer

A. Very short answer type questions and answers

Q.1. What helps us to see the objects? 

Ans: Light helps us to see the objects.

Q.2. What are luminous objects? 

Ans: Objects which give out or emit light of their own are called luminous objects. 

Q.3. Give two examples of luminous objects.

Ans: The Sun, a lighted torch. 

Q.4. What are non-luminous objects?

Ans: Objects which do not give out or emit light of their own are called non- luminous objects.

Q.5. Give two examples of non-luminous objects.

Ans: A sheet of aluminium, a piece of wood.

Q.6. How do we see different objects? 

Ans: When light from a luminous object falls on the objects, it gets reflected and enters our eyes enabling us to see the ob- jects. 

Q.7. What are opaque objects? 

Ans: The objects through which we cannot see at all are called opaque objects. 

Q.8. What are transparent objects? 

Ans: The objects through which we are able to see clearly are called transparent objects. 

Q.9. What are translucent objects?

Ans: The objects through which we can see, but not very clearly are called translucent objects. 

Q.10. Give two examples of opaque objects?

Ans: A sheet of paper, a sheet of cardboard.

Q.11. Give two examples of transparent objects.

Ans: Air, water.

Q.12. Give two examples of translucent objects. 

Ans: A sheet of polythene, fog.

Q.13. What do you need to see a shadow? 

Ans: To see a shadow, we need a source of light, an opaque object and a screen. 

Q.14. What information do the shadows give us? 

Ans: Shadows give us some information about shapes of the objects. 

Q.15. What type of images do you see with your pinhole camera? 

Ans: We see upside down images with our pinhole camera.

Q.16. When does a shadow form?

Ans: A shadow is formed when an opaque object obstructs the light. 

Q. 17. How does mirror form image?

Ans: A mirror forms image by reflection of light. 

Q.18. Fill in the blanks with words from among the given alternatives. 

(a) Without _______, things cannot be seen. (shadow/light) 

Ans: Light. 

(b) Objects which give out light of their own are called _______ objects. (transparent/luminous)

Ans: Luminous. 

(c) Light travels along a ________ line. (straight/curved)

Ans: Straight. 

(d) Opaque objects ________ light to pass through them. (allow/ do not allow)

Ans: Do not allow. 

(e) Transparent objects ____ light to pass through them. (allow/do not allow) 

Ans: Allow. 

(f) Translucent objects allow light to pass through them ________  (fully / partially) 

Ans: Partially. 

(g) A mirror changes the ________ of light that falls on it. (colour/ direction) 

Ans: Direction.

অসমীয়া মাধ্যমত পাঠভিত্তিক প্ৰশ্নোত্তৰ

প্ৰশ্ন : – ১) অস্বচ্ছ বস্তুৰ বিষয়ে বুজি পাবলৈ তলৰ কাঁচবোৰ পুনৰ সজাই এটা বাক্য বনোৱা ।

OWS ,AKE ,OPAQ,UEO,BJEC,TSM,SHAD

উত্তৰঃ –  OPAQ,UEO,BJEC,TSM,AKE,SHAD,OWS

প্ৰশ্ন : –  ২)  তলত দিয়া বস্তু বা সঁজুলিবোৰ অস্বচ্ছ , স্বচ্ছ বা ঈষৎ স্বচ্ছ আৰু উজ্জ্বল বা অনুজ্জ্বল এইদৰে শ্ৰেণীবিভাগ কৰা :

বায়ু , শিলগুটি , এচটা এলুমিনীয়াম , এখন দাপোন , এখন কাঠৰ বৰ্ড , এখিলা পলিথিন , এখন চিডি , এখন সমতল দাপোন , কুঁৱলী , ৰঙাকৈ গৰম কৰা এটুকুৰা লো , এটা ছাটি , ধোঁৱা , এটা জ্বলি থকা প্ৰতিপ্রভা টিউব লাইট , এখন বেৰ , এখিলা কাৰ্বন পেপাৰ , গেছ বাৰ্ণৰৰ শিখা , এখন কাৰ্ড বৰ্ড , এটা জ্বলি থকা টৰ্চ , এটা চেলফোন তাৰৰ জালি , কেৰাচীনৰ ষ্টভ , সূৰ্য , জোনাকী পৰুৱা , চন্দ্ৰ ।

উত্তৰঃ – ক) স্বচ্ছ : বায়ু , এচটা কাংচ , এটা চেল’ফোন ।

খ)ঈষৎ স্বচ্ছ : এখিলা পলিথিন , কুঁৱলী , ধোঁৱা , তাৰ ।

গ) অস্বচ্ছ : শিলগুটি , এচটা এলুমিনীয়াম , কাঠৰ বৰ্ড , এখন চিডি , ছাটি , দেৱালা ।

ঘ) উজ্জ্বল বস্তু : ৰঙাকৈ গৰম কৰা এটুকুৰা লো , পাতল ফ্লৰ’চেণ্ট টিউব , গেছৰ বাৰ্ণাৰ , জ্বলাই ৰখা টৰ্চ , কেৰাচিনৰ ষ্টোভ , সূৰ্য , জোনাকী পৰুৱা , চন্দ্ৰ ।

প্ৰশ্ন : –  ৩) এনে এটা আকৃতিৰ বস্তু তৈয়াৰ কৰাৰ কথা ভাবিব পাৰিনে যিটো এটা দিশত ৰাখিলে ঘূৰণীয়া ছাঁৰ সৃষ্টি কৰে আৰু আন এটা দিশত ৰাখিলে আয়তাকাৰ ছাঁৰ সৃষ্টি কৰে ?

উত্তৰঃ – পাৰি । উদাহৰণ স্বৰূপে এটা চিলিণ্ডাৰ , এখন বৃত্তাকাৰ থাল ৰাখিলে এনে ঘটনা সংঘটিত হব ।

প্ৰশ্ন : –  ৪) এটা সম্পূৰ্ণ আন্ধাৰ কোঠাত যদি তুমি তোমাৰ সন্মুখত দাপোনখন ধৰা তেতিয়া তোমাৰ প্ৰতিবিম্ব দেখা পাবানে ?

উত্তৰঃ – পোহৰ নথকাৰ বাবে কোনো প্ৰতিবিম্ব গঠন নহয় ।

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