Which among the following objects must be used to cover the window of a room, so that the room remains dark during the day time?

Tracing paper

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Glass pane

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Butter paper

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Wooden board

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Solution

The correct option is D Wooden board
Opaque objects do not allow light to pass through it. Therefore, we need to use an opaque object to cover the window of the room so that it remains dark during the day time. In the given options, a wooden board is an opaque object. So, it can be used for covering the window.

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