CBSE Class 7 Science Light: Shadows and Reflections (Class 7 NCERT New) Quiz 10

1. When should we not look at the sun?

A In the dark B At Noon C During the Lunar and Solar Eclipse D Always

2. Ruhi observed the shadow of a tree at 8:00 AM, 12:00 noon and 3:00 PM. Which of the following statements is the 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 changes. D Neither the shape nor the size of the shadow changes.

3. Which of the following can never form a circular shadow?

A A ball B A shoe box C A Flat disc D An Ice cream cone

4. Two students while sitting across the table look down onto its top surface, they notice they could see their own and each others image. The table top is likely to be made up of?

A Unpolished wood B Red stone C Glass sheet. D Wood-top covered with cloth

5. Can you think of creating a shape that will give a circular shadow if held in 1 way, and rectangular shadow if held in another way.

A Geoid B Sphere C Rectangle D Cylinder

6. A football match is being played at night in a stadium with lights on you can see the shadow of the football kept at the ground, but cannot see its shadow, when its kicked high in the air. Why?

A Because it's near the light. And therefore cannot be seen. B The shadow of the object cannot be caught if the screen and the object are very far from each other. C All of the above D None of the object

7. Rectilinear propagation of light means

A light bends after striking a smooth surface B light travels in a straight line C light travels in a curvilinear line D both a and b

8. which of the characteristics is not exhibited by the shadow of an object?

A erect B can be formed on screen C same colour as the object D can be bigger than the object

9. which of the following objects can cast a dark shadow?

A a lighted bulb B a wooden door C a glass pane D both a and b

10. A plane mirror form an image of an object because it ........ light from the object

A absorbs B reflects C passes D emits