Form 1 Science – Unit 7.5 : Dark, Dull Objects Absorb & Give out Heat Better

Form 1 Worksheet Unit 7.5 prepared by Ms Sue Page 1

1. The rates of heat absorption and radiation depends on the

(a) _________________________________ of the object.

(b) _____________________ of the surroundings.

2. An ________________ object which has a _________ or ___________ surface is a

(a) good ______________________________

(b) good ______________________________

(c) bad _______________________________

3. A ______________ and _______________ surface object is a

(a) bad _______________________________

(b) bad _______________________________

(c) good ______________________________

4. In the experiment above, it is found that after 30 minutes, the reading of thermometer

______ is higher than that of thermometer ______.

This shows that an object with a __________ surface is a better __________________ than an

object with a _____________ surface.

Form 1 Science – Unit 7.5 : Dark, Dull Objects Absorb & Give out Heat Better

Form 1 Worksheet Unit 7.5 prepared by Ms Sue Page 2

5. In the experiment above, it is found that after 30 minutes, the reading of thermometer

_______ is lower than that of thermometer _______.

This shows that an object with a ________surface is better heat radiator than an object

with a _________ surface.

6. Diagram below shows two shirts of different colours which are being dried under the

same conditions and surroundings.

(a) Based on your observations in the picture given, state the difference in the time

taken for the shirts to dry in Situation A and Situation B.

___________________________________________________________________________

_______________________________________________________________

(b) What inference can be made based on Situation A and Situation B?

___________________________________________________________________________

_______________________________________________________________

Diagram below shows an experiment to study the experiment to study the absorption of

heat by different surfaces. The apparatus is being heated for 5 minutes and the

thermometer reading in each minute is recorded in the table given below. The final

thermometer reading is shown.

Form 1 Science – Unit 7.5 : Dark, Dull Objects Absorb & Give out Heat Better

Form 1 Worksheet Unit 7.5 prepared by Ms Sue Page 3

Time of heating, t

(minutes)

Reading of thermometer,

X, (˚C)

Reading of thermometer,

Y, (˚C)

0 35 35

1 36 35

2 38 36

3 40 36

4 42 37

5

(c) State the following variables :-

Constant variable :

___________________________________________________________________________

Manipulated variable :

___________________________________________________________________________

Responding variable :

___________________________________________________________________________

(d) State the hypothesis for this experiment.

___________________________________________________________________________

___________________________________________________________________________

(e) Record the temperature reading in the table.

(f) Based on the information from the table, plot a graph to show the relationship

between the time of heating and the thermometer reading.

Form 1 Science – Unit 7.5 : Dark, Dull Objects Absorb & Give out Heat Better

Form 1 Worksheet Unit 7.5 prepared by Ms Sue Page 4

(g) Based on the graph, what is the relationship between the time, and the

temperature?

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

(h) Predict what will happen to the thermometer X reading after 5 minutes.

___________________________________________________________________________