GSEB Class 6 Science Solutions Chapter 11 Light, Shadows and Reflections

Question 1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects. OWS AKE OPAQ UEO BJEC TSM SHAD
Answer: Opaque objects make the shadow.
In simple words: You can move the words around to create a statement that explains how items that block light cause a shadow.

Exam Tip: When rearranging words, first identify the subject and verb to form a basic sentence structure, then fill in the remaining words.

Question 2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminum, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, the moon.
Answer: Here is a classification of the given objects and materials based on their properties regarding light and luminosity:

Exam Tip: Remember that transparent objects allow light to pass completely, translucent objects scatter some light, and opaque objects block all light, forming a shadow.

Question 3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?
Answer: Yes, there are many objects that will produce a circular shadow when held in one direction and a rectangular shadow when held in a different way. For example, a cylinder or a circular disc can show this property.
In simple words: Yes, you can. A cylinder is a good example; if you hold it one way, you get a round shadow, and if you turn it another way, you get a rectangle shadow.

Exam Tip: Consider common 3D shapes like cylinders or cones when thinking about shadows that change shape with orientation, as they have different profiles from different angles.

Question 4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
Answer: No, you will not see a reflection of yourself in a completely dark room. This happens because there is no light present in the room for reflection to occur, so no image can be formed.
In simple words: No, you won't see your reflection. A mirror needs light to bounce off you and then bounce off the mirror to show your image. No light, no reflection.

Exam Tip: Remember that reflection is the bouncing back of light from a surface. Without a light source, there is no light to be reflected, hence no image formation.