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तामिळनाडू बोर्ड ऑफ सेकेंडरी एज्युकेशनएस.एस.एल.सी. (इंग्रजी माध्यम) इयत्ता ७

What is a shadow? What things are necessary for the formation of a shadow? - Science

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प्रश्न

What is a shadow? What things are necessary for the formation of a shadow?

टीपा लिहा
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उत्तर

  1. Shadows are formed because light travels in straight lines.
  2. Shadow is always against, opposite side of light source.
  3. Shadow is formed by opaque objects that stop high from propagating.
  4. Things necessary for the formation of shadow: source of light, opaque object
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पाठ 1: Light - Evaluation [पृष्ठ २२]

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सामाचीर कलवी Science - Term 3 [English] Class 7 TN Board
पाठ 1 Light
Evaluation | Q V. 24. | पृष्ठ २२

संबंधित प्रश्‍न

Draw a ray diagram to show the formation of umbra alone.


Draw a ray diagram to show the formation of umbra and penumbra both. Label the parts umbra and penumbra in your diagram.


Tick the correct answer.

Umbra is a region of


Answer the following.

How is a shadow formed? Write the conditions required for a shadow to form.


What is shadow? 


When does a shadow form?


What are the essential conditions for the formation of shadow?


How does the colour of an opaque object affect the colour of the shadow?


What do we need in order to see a shadow?


Sivarajan placed a meter stick in the playground at 7.00 am in the morning. How will the shadow of the stick at noon look in comparison to the one in the morning


What are the properties of shadow?


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

O W S A K E O P A Q U E  O B J E T T  S M
S H A D          

The ______ is the darkest part of a shadow.


Correct the following statements.

  1. The colour of the shadow of an object depends on its colour of the object.
  2. Transparent objects allow light to pass through them partially.

A torch is placed at two different positions A and B, one by one, as shown in the following figure.


The shape of the shadow obtained in two positions is shown in the following figure.


Match the position of the torch and shape of the shadow of the ball.


Three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?


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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