NCERT Solutions for Class 6 Science Chapter 11 Light, Shadows and Reflections

1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

                                                                                                

Answer:

                                                                                                

Arranged boxes suggests – Opaque objects make shadows.

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 aluminium, 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, moon.

Answer:

Object	Object is Opaque/ Transparent/ Translucent	Object is Luminous or Non-luminous
Air	Transparent	Non – luminous
Water	Transparent	Non – luminous
Piece of rock	Opaque	Non – luminous
Sheet of aluminium	Opaque	Non – luminous
Mirror	Opaque	Non – luminous
Wooden board	Opaque	Non – luminous
Sheet of Polythene	Transparent	Non – luminous
CD	Opaque	Non – luminous
Smoke	Opaque	Non – luminous
Sheet of plane glass	Transparent	Non – luminous
Piece of red hot iron	Opaque	Luminous
Umbrella	Opaque	Non – luminous
Lighted fluorescent tube	Opaque	Luminous
Wall	Opaque	Non – luminous
Sheet of carbon paper	Opaque	Non – luminous
Flame of a gas burner	Opaque	Luminous
Sheet of cardboard	Opaque	Non – luminous
Lighted torch	Opaque	Luminous
Sheet of cellophane	Translucent	Non – luminous
Wire mesh	–	Non – luminous
Kerosene stove	Opaque	Luminous
Sun	Opaque	Luminous
Firefly	Opaque	Luminous
Moon	Opaque	Non – luminous

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: Cylinder shape object. If a cylinder shaped object is held vertically to the source of light (torch) the shadow will be circular and if it held horizontally towards the source light then that shadow will be rectangular.

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. If there is light, only then the image can be formed and reflected by plane mirrors. In a completely dark room, there is no light available to reflect an image. So, we cannot see our self in the mirror.

Check other lessons NCERT Solutions for Class 6

Download free NCERT textbook class 6 Science – Chapter 11 Light, Shadows and Reflections