NCERT Exemplar I — task. Science CBSE, Class 7.

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1. A marble tile would feel cold as compared to a wooden tile on a winter morning because the marble tile

is a poor conductor of heat than the wooden tile.
is polished while the wooden tile is not polished.
reflects more heat than wooden tile.
is a better conductor of heat than the wooden tile.

2. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because

air trapped between the layers of newspaper is a bad conductor of heat.
newspaper is a conductor of heat.
friction between the layers of newspaper produces heat.
newspaper is at a higher temperature than the temperature of the surrounding.

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