Q1. Rearrange the boxes given below to make a sentence that help us understand opaque objects.
OWS OPAQ UE O BJECT TSM SHAD
Ans -:
OPAQ | UE O | BJEC | T S M | AKE | SHAD | OWS |
Q2. 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 aluminium, a mirror, as 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, moon.
Ans -:
Opaque | Transparent | Translucent | Luminous | Non-luminous |
A piece of rock | Air | A sheet of polythene | A lightened florescent tube | A mirror |
A sheet of aluminium | Water | Fog | Flame of gas burner | A piece of rock |
A CD | A sheet of plane glass | A sheet of cellophane | A lighted torch | A wire mess |
Smoke | Firefly | A piece of rock | ||
Iron | Stove | Iron | ||
An umbrella | Sun | A wall | ||
A wall | Moon |
Q3. 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?
Ans -:
- Yes,
Q4. In a completely dark room, if you hold up a mirror in front of you, will you see reflection of yourself in the mirror?
Ans :- . In completely dark room, one cannot see any image in the mirror, because there is no light falling on the mirror which can be reflected to show the image.