NCERT Solutions for Class 6th Science: Chapter 11 – Light Shadows and Reflection

NCERT Solutions for Class 6th Science: Chapter 11 – Light Shadows and Reflection



Class 6 Science Chapter 11 Light Shadows and Reflection NCERT Solution is given below.
Question 1:
Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
Answer:
Opaque objects make shadows.
Question 2:
Classify the objects or materials given below as opaque, transparent or translucent, luminous or non-luminous:
Air, water, piece of rock, sheet of aluminium, mirror, wooden board, sheet of polythene, CD, smoke, sheet of plane glass, fog, piece of red hot iron, umbrella, lighted florescent tube, wall, sheet of carbon paper, flame of a gas burner, sheet of cardboard, lighted torch, sheet of cellophane, wire mesh, kerosene stove, sun, firefly, moon.
Answer:
ObjectObject is Transparent/Translucent/OpaqueObject is Luminous/Nonluminous
AirTransparentNon-luminous
WaterTransparentNon-luminous
Piece of rockOpaqueNon-luminous
Sheet of aluminiumOpaqueNon-luminous
MirrorOpaqueNon-luminous
Wooden boardOpaqueNon-luminous
Sheet of polytheneTranslucentNon-luminous
CDTranslucentNon-luminous
SmokeTranslucentNon-luminous
Sheet of plane glassTransparentNon-luminous
FogTranslucentNon-luminous
Piece of red hot ironOpaqueLuminous
UmbrellaOpaqueNon-luminous
Lighted fluorescent tubeOpaqueLuminous
WallOpaqueNon-luminous
Sheet of carbon paperOpaqueNon-luminous
Flame of a gas burnerTranslucentLuminous
Sheet of cardboardOpaqueNon-luminous
Lighted torchOpaqueLuminous
Sheet of cellophaneTranslucentNon-luminous
Wire meshTranslucentNon-luminous
Kerosene stoveOpaqueLuminous
SunOpaqueLuminous
FireflyOpaqueLuminous
MoonOpaqueNon-luminous
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:
When a cylinder is held in sunlight, then a circular shadow or a rectangular shadow can be obtained depending on its orientation related to the Sun.

When the top of the cylinder faces the Sun, then the shadow formed is circular. On the other hand, when the side of the cylinder faces the Sun, then the shadow formed is rectangular.
Question 4:
In a completely dark room, if you hold up a mirror in front of you, will you see your reflection in the mirror?
Answer:
An image is formed due to reflection of light by a plane mirror. In a completely dark room, there is no light present in the room. Thus, no reflection of light takes place by the mirror placed in the room. Hence, no image will get formed by a mirror in a completely dark room.