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What do we call a substance through which we cannot see light? Give an example of such a substance.
Concept: undefined >> undefined
What do we call a substance through which light passes? Give an example of such a substance.
Concept: undefined >> undefined
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Can a transparent medium form an image? Explain your answer.
Concept: undefined >> undefined
Match the following.
| Column A | Column B |
| 1. Rolling friction | a. making grooved designs |
| 2. Static friction | b. regular oiling |
| 3. Reducing friction | c. a book placed on a tabletop |
| 4. Increasing Friction | d. wheels of a car |
Concept: undefined >> undefined
Give a reason for the following.
Brake handles of motorcycles are generally covered with a toweled cloth?
Concept: undefined >> undefined
Solve the crossword puzzle.
Across
1. Type of force which depends upon the roughness of a surface
2. An effect of friction
3. The force of friction caused due to fluids
4. Type of friction acting between two bodies at rest
5. Type of friction which occurs when applied force overcomes static friction
6. A special body design to enable minimum drage Down
Concept: undefined >> undefined
Name any four man made sources of light.
Concept: undefined >> undefined
Why do objects in a room become visible even if sunlight does not enter it?
Concept: undefined >> undefined
Does the flame of a gas stove emit light?
Concept: undefined >> undefined
Name a few living things which emit light.
Concept: undefined >> undefined
From among the following objects, list out the opaque, translucent, and transparent bodies in the space provided below:
A glass strip, an ordinary paper, greased paper, tracing paper, polythene sheet, wooden piece, steel plate, glycerine, kerosene oil, mustard oil, grounded glass, stone, book, water, and milk.
Opaque Transparent Translucent
Concept: undefined >> undefined
Write the names of some transparent objects.
Concept: undefined >> undefined
What do you understand by candle power?
Concept: undefined >> undefined
Write the names of some cold light-emitting objects.
Concept: undefined >> undefined
Tick the correct answer.
Light causes
Concept: undefined >> undefined
Tick the correct answer.
Light is a font of
Concept: undefined >> undefined
Tick the correct answer.
The natural source of light is
Concept: undefined >> undefined
Tick the correct answer.
A tube light is a
Concept: undefined >> undefined
Tick the correct answer.
Substance which don’t allow light to pass through them,
Concept: undefined >> undefined
