Question

D. Answers the following questions in brief.
1. Classify the materials given below as opaque, transparent or translucent.
air, smoke, fog, aluminium sheet, wooden board, cellotape, polythene sheet
lime juice, wax, rubber, tyre and milk
2 State the type of path that light ordinarily follows when going from one point
to another?
3.
Do fishes cast shadows in water?
4
On a sunny day, two identical bedsheets, of red and green colour, are hanging
on a clothes line. What would be the colour of the shadows of these two bed
sheets?
5.
State the relative positions, of the sun, moon and the earth, during a lunar
eclipse.
200​

Answer 1

Answer:

1) opaque - air , smoke,fog,

Translucent - aluminum sheet , wooden board

Transparent - Celotape , polythene sheet

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Answer 2

Answer:

1. Transparent- air,cellotape, polythene sheet,wax.

transculent- fog, smoke,lime juice.

opaque- aluminium sheet, wooden board,rubber, tyre,milk.

2. straight line

3.Yes

4. Black

5.Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line. Lunar eclipses work the same way in a different order: Moon, Earth and Sun all on a line. In this case the Earth's shadow hides the Moon from view.

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