Question 1 :
<img style='object-fit:contain' src='61b1c6c1f59b460d7261e629' /> Look at the above figure. Will there be any difference in the shadow formed on the screen in A and B.

Question 2 :
State true or false : Transparent objects allow light to pass through them partially.

Question 3 :
<img style='object-fit:contain' src='61b1c6b9f59b460d7261e628' /> Three torches A, B and C shown in the above figure are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen?

Question 4 :
Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c696f59b460d7261e623.jpg' /> As shown in the above figure four students A, B, C and D looked through pipes of different shapes to see a candle flame. Who will be able to see the candle flame clearly?

Question 6 :
You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

Question 7 :
<img style='object-fit:contain' src='61b1c6a8f59b460d7261e626' /> You have 3 opaque strips with very small holes of different shapes as shown in the above figure. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c696f59b460d7261e622.jpg' /> A student observes a tree given in the above figure through a pinhole camera. Which of the diagrams given in Fig. (a) to (d), depicts the image seen by her correctly? <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1a9278c526e972caefc0.jpg' />

Question 9 :
Three identical towels of red, blue and green colour are hanging on a clothesline in the sun. What would be the colour of shadows of these towels?

Question 11 :
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?

Question 13 :
Two students while sitting across a table looked down on to its top surface. They noticed that they could see their own and each other’s image. The table top is likely to be made of:

Question 14 :
Which of the following is/are not always necessary to observe a shadow?

Question 15 :
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?

Question 16 :
<img style='object-fit:contain' src='61b1c697f59b460d7261e624' /> <img style='object-fit:contain' src='61cc1a9278c526e972caefc1' /> A torch is placed at two different positions A and B, one by one, as shown in the above figure . The shape of the shadow obtained in two positions is also shown. Match the position of the torch and shape of the shadow of the ball .

Question 17 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c695f59b460d7261e621.jpg' /> Observe the above figure carefully. A patch of light is obtained at B, when the torch is lighted as shown in the above figure. Which of the following is kept at position A to get this patch of light?

Question 18 :
Which of the following depicts a situation where we obtain more than one shadow of an object at a time ?

Question 19 :
State true or false : The colour of the shadow of an object depends on its colour of the object.

Question 20 :
<img style='object-fit:contain' src='61b1c6b1f59b460d7261e627' /> Observe the above given figure. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet?