ACT Science Practice Test 109

Directions: Each passage is followed by several questions. After reading a passage, choose the best answer to each question and fill in the corresponding oval on your answer document. You may refer to the passages as often as necessary.

You are NOT permitted to use a calculator on this test.


PASSAGE III

A mercury thermometer, at an initial temperature of 20°C, was placed in 40°C water, and the temperature registered by the thermometer was recorded over time. This procedure was repeated using water samples at 50°C and 60°C (see Figure 1). Next, the same thermometer, at an initial temperature of 60°C, was placed in an air sample at 50°C, and the temperature registered by the thermometer was recorded over time. This procedure was repeated using air samples at 30°C and 40°C (see Figure 2).

Figure 1

Figure 2

(Note: Assume that the temperatures of the water and air samples did not change during the measurements.)

1. Based on Figure 1, at 3.0 sec, the thermometer reading in the 40°C water most likely was closest to which of the following?

A. 47°C
B. 42°C
C. 36°C
D. 29°C

2. According to Figure 2, for an air temperature of 30°C, over which of the following time intervals was the thermometer reading changing most rapidly?

F. 0-100 sec.
G. 100-200 sec.
H. 200-300 sec.
J. 300-400 sec.

3. When the thermometer was in the 40°C water, in the time interval between 0 sec and 2 sec, approximately how rapidly, in °C/sec, was the temperature registered by the thermometer changing?

A. 1°C/sec.
B. 5°C/sec.
C. 10°C/sec.
D. 40°C/sec.

4. Based on Figure 2, if the thermometer, at an initial temperature of 60°C, had been placed in an air sample at 20°C, how long would it most likely have taken the thermometer reading to reach 20°C?

F. Less than 10 sec.
G. Between 10 and 50 sec.
H. Between 50 and 100 sec.
J. Greater than 100 sec.

5. According to the passage, at which of the following did the thermometer register the highest reading?

A. Water temperature 60°C, 4.0 sec.
B. Water temperature 60°C, 2.0 sec.
C. Water temperature 50°C, 4.0 sec.
D. Water temperature 50°C, 2.0 sec.