ACT Science Practice Test 95

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

Students conducted an experiment to determine the insulating properties of certain materials. In each trial, "blankets" made of different materials of different thicknesses were wrapped around an aluminum capsule filled with 0.250 L of water at a known initial temperature, Ti, and placed into an oven preheated to a certain temperature. Heat was transferred through the insulating materials from the oven to the water inside the capsule. After 5 minutes, the temperature of the water inside the capsule, Tf, was recorded. The heat flow, measured in joules per second (J/s), is shown in Table 1.

(Note: In each trial, the same size and shape of aluminum capsule were used. One trial was done with no insulation around the aluminum capsule.)

1. According to the information provided, heat flowed from the water in the capsule at temperature Ti to the surrounding oven in which of the following trials?

A. Trial 1
B. Trial 5
C. Trial 9
D. Trial 12

2. The best insulators are those that are the poorest heat conductors. According to Trials 3 through 11, which of the following materials would likely provide the best insulation between a room and the outdoors?

F. Fiberglass
G. Cellulose
H. Asbestos
J. Rubber

3. According to Table 1, which of the following combinations of insulating material and insulator thickness resulted in the greatest heat flow?

A. Fiberglass, 1.5 in
B. Fiberglass, 1.0 in
C. Cellulose, 1.5 in
D. Cellulose, 1.0 in

4. Materials differ in their thermal conductivity: the higher the thermal conductivity, the greater the heat flow through the corresponding thickness of the insulating material. According to Trials 4 through 11, which of the following statements about relative thermal conductivities is NOT true?

F. Fiberglass has a higher thermal conductivity value than asbestos.
G. Rubber has a higher thermal conductivity value than cellulose.
H. Cellulose has a lower thermal conductivity value than fiberglass.
J. Fiberglass has a lower thermal conductivity value than rubber.

5. Trials 3 and 5 provide evidence that heat flow depends on which of the following factors?

A. Type of insulating material.
B. Temperature of oven.
C. Contact area.
D. Thickness of insulating material.