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## School Physics Quiz : Heat

Answer the following questions based on heat.

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Multiple choice

1.

_______ have the highest calorific value.
 Carbohydrates Sugars Vitamins Proteins Fats

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2.

A mass of 50 kg falls 80m. If all its potential energy is converted to heat and gravitational acceleration = 9.8 m/s2, then the heat gained is
 4000 J 39200 J 784 J 490 J

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3.

1 Joule = _______ ergs
 105 107 4.214 4.184

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4.

Given that 1 cal (about 4.2 J) of heat is required to raise the temperature of 1 g of water by 1oC, how much heat is required to raise the temperature of 2 g of water by 7oC?
 58.8 J 14.0 J 29.4 J 8.4 J

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5.

The increase in the area of a solid on heating is called
 superficial expansion cubical expansion linear expansion

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6.

Liquids exhibit only _______ expansion.
 cubical superficial linear

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7.

Water at 25oC is mixed with an equal mass of water at 90oC. If there are no heat losses to the surroundings, then what is the final temperature of the water mixture ?
 57.5oC 90oC 25oC 115.0oC

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