The speed of light in four different materials is shown below: Material Speed of light in thousand miles per second
A 140
B 78
C 186
D 124

Which material is the least dense? (4 points)

Material A

Material B

Material C

Material D

2.
(05.03 MC)

A piece of iron at 25 °C is dropped into a glass of water at 15 °C. Which statement is correct? (4 points)

Heat will flow from the iron to the water in the glass until both reach the same temperature.

Heat will flow from the water in the glass to the iron until both reach the same temperature.

The final temperature of the water in the glass and the iron will be 25 °C.

The final temperature of the water in the glass and the iron will be 15 °C.

3.
(05.04 HC)

The horseshoe crab looks very similar to its fossil ancestor from the Jurassic era. Why has the horseshoe crab not evolved? (4 points)

Its original form always remained well adapted to its environment.

The species was affected by natural selection.

The species did not pass on genetic information to its offspring.

The species underwent major mutations in a short period of time.

4.
(05.04 LC)

Which term is used to describe the variety of inheritable traits in a species? (4 points)

Ecosystem diversity

Genetic diversity

Natural selection

Species diversity

5.
(05.04 MC)

The table below shows the set of traits in four different beetle populations.

Traits in Population
Population Traits
1 Brown-colored beetles, pesticide-resistant gene present
2 Green-colored beetles, pesticide-resistant gene absent
3 Green and browncolored beetles, pesticide-resistant gene absent
4 Green and browncolored beetles, pesticide-resistant gene present

Which population of beetles is most likely to become extinct in an environment with increased predators and pesticides due to not enough variation? (4 points)

1

2

3

4

6.
(05.01 LC)

What forms white light? (4 points)

Combination of all the wavelengths of ultraviolet light

Combination of all the wavelengths of visible light

Absorption of electromagnetic rays

Absorption of infrared rays