Which of the following is most important to achieving an accurate resu

5005 Praxis Practice Test

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Question 1 of 5.

Which of the following is most important to achieving an accurate result when performing a coliform water samples?

A. The samples must be boiled.

B. The equipment must be properly sterilized before use.

C. The samples are over 24 hours old.

D. The samples must have been taken from a body of moving water such as a river.

Explanation: Sterilizing equipment prevents contamination, ensuring accurate coliform counts.

Question 2 of 5.

The rotation of Earth around its axis is responsible for which of the following?

A. The force of gravity

B. The day and night cycle

C. The temperature differences between seasons

D. The movement of continents relative to one another

Explanation: The rotation of Earth on its axis causes the cycle of day and night as different parts of the Earth face towards or away from the Sun.

Question 3 of 5.

Which THREE of the following agricultural practices are most likely to have a negative impact on the environment?

A. Increasing the amount of fertilizer applied to a field to maximize crop yields

B. Providing a field with excessive amounts of water to maintain ground saturation

C. Applying nonselective herbicides to a field at the end of the growing season to eliminate weeds

D. Planting crops in a field with minimal disturbance of the surface soil to reduce soil erosion

Explanation: Excessive fertilizer can lead to nutrient runoff, causing water pollution. Excessive water can lead to soil erosion and water waste. Nonselective herbicides can harm beneficial organisms and biodiversity. Minimal disturbance planting is beneficial for soil health.

Question 4 of 5.

Which TWO of the following are powered most directly by the Sun's energy?

A. Surface currents in the ocean

B. Volcanic eruptions

C. Tectonic plate movements

D. Convection in the atmosphere

Explanation: Surface currents are driven by winds, which are caused by uneven heating of the Earth's surface by the Sun. Convection in the atmosphere is also directly driven by solar heating.

Question 5 of 5.

Natural gas-fired power plants are considered greenhouse gas emitters because the burning of natural gas produces which of the following?

A. Hydrogen

B. Radon

C. Carbon dioxide

D. Helium

Explanation: Burning natural gas (methane) produces carbon dioxide and water vapor. Carbon dioxide is a greenhouse gas.