1. Which of the following statements is true? a. low temperature always means lo

Question

1. Which of the following statements is true?

a. low temperature always means low heat

b. faster average speed implies lower temperature

c. slower average speed implies higher temperature

d. high temperature always means high heat

e. heat may be low or high regardless of temperature

2. Condensation is a ________ process

a. heating

b. cooling

c. evaporation

d. convection

3. Which of the following is not a method of heat transfer?

a. temperature inversion

b. conduction

c. convection

d. radiation

4. Evaporation is a ________ process.

a. condensation

b. convection

c. heating

5. Determine the number of calories needed to change 35 g of water at 25 degrees celcius into steam at 100 degrees celcius

d. cooling

Explanation / Answer

1) e

heat depends on temperature difference and not the temperature irself hence it can be low or high

2)b

In condensation vapours cool to give liquid

3)a

There are only 3 modes of heat transfer conduction,convection and radiation

4)c

In evaporation liquid heats up to form vapours

5) heat gained to reach 100 degrees

75*1*35=2625calories specific heat capacity of water is 1cal/g c

heat gained to convert to steam= 540*35=18900cal

total=18900+2625=21525J

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