Answers25-26 TX-Physics A-CRUnit Test

Unit Test — Cumulative exam Answers

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1
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Why is it advisable to wear long sleeves when students work in a chemistry lab?

A
to provide warmth near the lab refrigerator
B
to protect the arms from lab chemicals
C
to minimize burns from hot water at the lab sink
D
to prevent burns when using a Bunsen burner
2
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The research and design team of a car manufacturing company is developing a new safety product that automatically tests a car’s brakes. When the team discusses how exactly they plan to determine whether the new technology is successful or not, what stage of technological design are they in?

A
first
B
second
C
third
D
fourth
3

The MSDS for propane gives it a health rating of 1, a flammability rating of 4, and a reactivity rating of 0. According to the MSDS, which best describes propane?

A
highly corrosive
B
highly toxic
C
highly flammable
D
highly reactive
4

How do the ongoing processes of scientific investigation and technological design interact with each other?

A
Scientific investigation discovers new information that can be used in technological design, and technological design provides new products that can further scientific investigation.
B
Technological design discovers new information that can be used in scientific investigation, and scientific investigation provides new products that can further technological design.
C
Scientific investigation determines new problems that should be examined in technological design, and technological design provides research for scientific investigation.
D
Technological design determines new problems that should be examined by scientific investigation, and scientific investigation provides research for technological design.
5

A car travels straight for 20 miles on a road that is 30° north of east. What is the east component of the car’s displacement to the nearest tenth of a mile?

A
-17.3 miles
B
-10.0 miles
C
10.0 miles
D
17.3 miles
6

Ronnie kicks a playground ball with an initial velocity of 16 m/s at an angle of 40° relative to the ground. What is the approximate horizontal component of the initial velocity?

A
0.64 m/s
B
0.77 m/s
C
10.3 m/s
D
12.3 m/s
7

An entire group of elements was unknown when the periodic table was first developed because they were unreactive and no known compounds were composed of them. What most likely led to the inclusion of these elements in the periodic table?

A
the formation of a compound in the laboratory
B
new technology that showed how to identify one of the elements
C
improvements in instruments to measure small masses
D
more careful experiments to create synthetic elements
8

Cranberries and grapes may have therapeutic value. A cranberry company obtained the patent for a process to extract the oil from cranberry seeds. According to the patent, this oil can be used to treat breast cancer or to reduce its incidence. The oil can be used in drinks and foods. A grape juice company claims to have evidence that certain grapes have health benefits ranging from improving cardiovascular health to improving cognitive brain function in the elderly. These claims will be tested by the Food and Drug Administration (FDA) before the companies are allowed to market their products for “treating” ailments or “improving” health. Until then, the companies can describe that their products “help to maintain” or “support” health. Until studies support their claims, the companies cannot ascribe direct health benefits to their products.Why would the FDA perform tests when a cranberry company and a grape company have already conducted research on the same products?

A
The FDA is the only organization that can test if health actually improves.
B
Tests that are performed by any company which benefits financially are considered unreliable.
C
The FDA tests give reliability to the results of improved health obtained by each company.
D
Tests performed by the FDA follow established scientific methods, but those performed by companies do not.
9

The first known telescopes, used around 1600, consisted of a lens and an eyepiece. Today, telescopes are often computer controlled and consist of a complicated array of sophisticated lenses. Which statement correctly describes how telescopes have changed over time?

A
The telescopes of the 1600s were used until the year 2000, when a more sophisticated telescope was built.
B
The telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today.
C
The telescopes of the 1600s were used until the year 1900, when a more sophisticated telescope was built that was used until the year 2000.
D
The telescopes of the 1600s were abandoned after about 50 years, and the technology was completely replaced.
10

Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table.

Question illustration
A
X, Y, W, Z
B
X, W, Y, Z
C
Z, W, Y, X
D
Z, Y, W, X
11

The power ratings of several motors are listed in the table.An advertising agency writes marketing material for a new motor (Brand W) that has a power rating of 7,640 W. Which statement comparing the motors can they truthfully use?

Question illustration
A
Brand W motor can finish any job faster than Brand Y motor can.
B
There’s not a more powerful motor available.
C
Brand W motor does more work each second than Brand X or Brand Z.
D
Every second, Brand W motor does 7,640 N of your toughest work.
12

A block slides down a rough ramp with a 30-degree incline as shown.Which diagram represents the forces acting on the block?

Question illustration
A
Option
B
Option
C
Option
D
Option
13

What is the acceleration along the ground of a 10 kg wagon when it is pulled with a force of 44 N at an angle of 35° above the horizontal?

A
0.23 m/s2
B
0.28 m/s2
C
2.52 m/s2
D
3.60 m/s2
14

Two animals that can be found at the Grand Canyon include the Abert’s and Kaibab squirrels. The Abert’s squirrel is found at the south rim of the canyon and in a few surrounding states. The Kaibab squirrel, however, can only be found at the canyon’s north rim, mainly on the Kaibab Plateau. The Kaibab squirrel is not found anywhere else in the world. Scientists believe that the squirrels are actually closely related and have developed separately as a result of geographic isolation. It is possible that the squirrels were separated by plateau erosion that separated the forests and isolated the Kaibab population. Some scientists are studying if the squirrels are now two separate species or if the Kaibab squirrel is simply a subspecies of the Abert’s squirrel. Separate species are unable to reproduce with each other. Which evidence would be used to support the claim that the squirrels are two separate species?

A
The Abert’s squirrel is found at the south rim of the canyon, but the Kaibab squirrel is found at the north rim of the canyon.
B
Geologists prove that plateau erosion is the main cause of forest separation in the region.
C
Scientists observe that Abert’s squirrels are slightly larger and have bushier tails than Kaibab squirrels do.
D
When placed together in pairs for study, no pair of Abert’s squirrel and Kaibab squirrel result in offspring.
15

Which is the best example of kinetic energy?

A
A picture of a field of flowers in the sunlight.
Option A
B
A picture of an owl sitting on a branch.
Option B
C
A picture of a dog running.
Option C
D
A picture of some rocks sitting on grass.
Option D
16

A crane lifts up two boxes.

Question illustration
A
A free body diagram with two force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline.
Option A
B
A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing downward labeled F Subscript g B.
Option B
C
A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing downward labeled F Subscript T 2.
Option C
D
A free body diagram with three force vectors, the first pointing downward labeled F Subscript g A Baseline, the second pointing upward labeled F Subscript T 1 Baseline, and the third pointing upward labeled F Subscript T 2.
Option D
17

Briana swings a ball on the end of a rope in a circle. The rope is 1.5 m long. The ball completes a full circle every 2.2 s.

A
0.68 m/s
B
2.1 m/s
C
4.3 m/s
D
9.2 m/s
18

A train travels 600 km in 4 hours. What is the speed of the train?

A
0.007 km/h
B
604 km/h
C
150 km/h
D
2,400 km/h
19

A 2.5 kg block is launched along the ground by a spring with a spring constant of 56 N/m. The spring is initially compressed 0.75 m.

A
3.5 m/s
B
4.1 m/s
C
13 m/s
D
16 m/s
20

Jan made a diagram to compare speed and velocity.

Question illustration
A
Is always constant
B
Includes magnitude
C
Has direction
D
Depends on a reference frame

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