Question 7 :
Spinning is a process of making fibres. Is it TRUE or FALSE?

Question 8 :
Jute is the outer covering of coconut. Is it TRUE or FALSE?

Question 11 :
Silk fibre is obtained from the stem of a plant. Is it TRUE or FALSE?

Question 14 :
Weaving of yarn makes a piece of fabric.Is it TRUE or FALSE?

Question 16 :
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 17 :
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 : Transparent objects allow light to pass through them partially.

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?

Question 21 :
Which of the following is/are not always necessary to observe a shadow?

Question 22 :
<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 23 :
<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 24 :
<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 25 :
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 26 :
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 27 :
You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

Question 28 :
State true or false : The colour of the shadow of an object depends on its colour of the object.

Question 29 :
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 30 :
<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 31 :
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 32 :
<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 33 :
<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 34 :
<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?