Shadow Formation

Q.

Question 5

Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observation about the shape and size of the shadow?

(a) The shape of the shadow of the tree changes but the size remains the same.

(b) The size of the shadow of the tree changes but the shape remains the same.

(c) Both the size and shape of the shadow of the tree change.

(d) Neither the shape nor the size of the shadow changes.

Q.

What types of objects do not cast shadows? [2 MARKS]

Q. What is the condition for shadow formation?

1. Shadows are formed when a transparent object comes in the path of light

2. Shadows are formed when an opaque object comes in the path of object

3. Shadows are formed when an opaque object comes in the path of light

4. Its an imaginary ghost

Q.

Question 4

Which of the following is/are not always necessary to observe a shadow?

(a) Sun

(b) Screen

(c) Source of light

(d) Opaque object

Q.

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

Q.

When the distance between the object and the source of light is increased

Q.

Question 13

Suggest a situation where we obtain more than one shadow of an object at a time.

Q. Why cant we see a birds shadow flying high in sky

Q. Three identical towels of red, blue, and green colour are hanging on a clothesline in the Sun. What would be the colour of the shadows of these towels?

Q. Which type of objects cannot cast a shadow?

1. Transparent
2. Translucent
3. Opaque
4. Metallic

Q.

Question 6

Which of the following can never form a circular shadow?

(a) A ball

(b) A flat disc

(c) A shoe box

(d) An ice cream cone

Q.

Question 14

On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?

Q.

A football match is being played at night in a stadium with floodlights 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.

Q. To see shadows with the help of our eyes, a screen is required.

1. False
2. True

Q.

How are shadows formed? What are the two types of shadows based on the source of light? Do all objects cast shadows?

Q.

Question 22

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

Q.

Question 12

Correct the following statements.
(i) The colour of the shadow of an object depends on its colour.
(ii) Transparent objects allow light to pass through them partially.

Q.

Question 21

In Fig., a flower made of thick coloured paper has been pasted on the transparent glass sheet. What will be the shape and colour of shadow seen on the screen?

Q.

Question 16

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

The shape of the shadow obtained in two positions is shown in the given Fig.

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

Q.

On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?

Q.

Question 24

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. 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.

Q.

The dark region behind an opaque object is called the_______ of the object.

Q.

A student had a ball, a screen, and a torch in a 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.​

Q.

Question 11

Look at the figure given below

Will there be any difference in the shadow formed on the screen in A and B?

Q. Explain about solar eclipse and lunar eclipse Draw the ray diagrams

Q. Why don't aeroplanes flying at higher altitudes cast a shadow on the ground?

Q. What is order of the Sun, Moon and Earth during a solar eclipse?

1. Sun, Earth, Moon
2. Sun, Moon, Earth
3. Moon, Sun, Earth
4. Only Sun and Earth

Q. Fill in the blank:
Lunar eclipse occurs when the ______ comes in between the ______ and the sun.

Q.

Why does areoplanes moving in the sky does not cast a shadow ?

Q. Statement 1: Shadows are obtained on the screen where light falls.
Statement 2: Size of the shadow can be different from the size of the object.
Which of the following is correct?

1. Statement 1 is false but statement 2 is true.
2. Both the statements are true.
3. Statement 1 is true but statement 2 is false.
4. Both the statements are false.