Question Answers For All Chapters – General Science Class 6
Light and the Formation of Shadows
Exercise
1. Choose an appropriate word and fill in the blanks.
Answer –
(a) A star is a natural source of light.
(b) A candle is an artificial source of light.
(c) When light passes through a prism, it gets separated into seven colours.
(d) The image obtained in the pinhole camera is inverted.
(e) A shadow is formed when an opaque object comes in the way of light.
(f) When a transparent object comes in the way of light, light passes through it.
2. Write whether of the following objects are luminous or non-luminous.
Answer –
| Object | Luminous/Non-luminous |
|---|---|
| A book | Non-luminous |
| A burning candle | Luminous |
| A wax cloth | Non-luminous |
| A pencil | Non-luminous |
| A pen | Non-luminous |
| A light bulb (switched on) | Luminous |
| A tyre | Non-luminous |
| A torch (switched on) | Luminous |
3. Match the following.
Answer –
| Group A | Group B |
|---|---|
| (a) Mirror | (3) Reflection |
| (b) Firefly | (4) Luminous |
| (c) Pinhole camera | (2) Inverted image |
| (d) Moon | (1) Non-luminous |
4. Write the answers to the following.
(a) What things are necessary for the formation of a shadow?
Answer – For a shadow to form, three things are necessary:
A light source (like the sun, a bulb, or a torch).
An opaque object (an object that blocks light).
A surface (like the ground or a wall) where the shadow appears.
(b) When can an object be seen?
Answer – An object can be seen when light falls on it and reflects into our eyes. If there is no light, we cannot see anything.
(c) What is a shadow?
Answer – A shadow is a dark shape formed when an opaque object blocks the path of light. It is always formed on the opposite side of the light source.
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