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NCERT Exemplar · Class 6 · Science

Chapter 11: Light

Practice each question, then open the answer or worked solution.

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Long Answer Questions

3 questions
Q22Written answer

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain. 

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Worked solution

Ans: In the case of a ball lying on ground, the ground being an opaque object acts as a screen as the light falls on it, forming a shadow of the ball. 

On the other hand when the ball is in air ground is far away from it and hence shadow will disappear as ball goes higher in air.


Q23Written answer

A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain. 

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Worked solution

Ans: Some of the reasons because of which the shadow can’t be obtained are as follows:

i) The distance between the ball and screen is too much.

ii) The light beam from the torch falls parallel to the screen on the wall.

iii) The torch is placed at a distance from the ball.


Q24Written answer

A sheet of plywood, a piece of muslin cloth and that of a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in Fig. $11.12$. Will the shadow be formed in each case? If yes, how will the shadow on the screen be different in each case? Give reasons for your answer.

seo images


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Worked solution

Ans: Shadow will not be formed in any of the cases except for muslin cloth and plywood.


i) As muslin cloth is translucent, the light will pass only partially and not completely through the cloth. So, a lighter image will be formed.


ii) A shadow is formed only when the object is opaque, we know that the glass is transparent. Hence, no shadow will be formed.


iii) A perfect dark shadow will be formed in this case as the plywood sheet is an opaque object.


Light- Chapter 11, Class 6 (Science, CBSE)

‘Light’ is the 11th chapter of Class 6th Science in the CBSE board. In this chapter, students will be introduced to the major factor for the survival of all living beings i.e. Light. They will learn about different terminologies that are related to Light. They will learn about the natural source of light, reflections, shadows, and images. This will be interesting for students as they will be fascinated to know the natural phenomenon that we see around us daily. There will be many different activities throughout the lesson which will be done by the students that will increase their curiosity and understanding. One such activity is the activity to show the reflection of Light. This can be done by the students at their homes during the night or in a dark room. They can ask someone to hold a mirror in their hand at one corner of the room and the student may stand at another corner with a torch covering it with their fingers. Directing the beam of torchLight onto the mirror, they will observe that a patch of light is reflected from the mirror. This will help them understand that Light travels in a straight line. Such activities will help the students retain knowledge in their memory.

 

Vedantu has all the necessary study materials that will be helpful for the students. They are notes that will contain important points and terms, revision notes, sample papers, and solved NCERT solutions. They have been prepared by our subject experts and will be quite easy and understandable for the students. They come in PDF form which can be easily downloaded on the Vedantu platforms by simply logging in or signing up. This will be free of cost, making learning easier and more fun.