Why does the Sun appear to be brighter than other stars?

5005 Praxis Practice Test

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Question 1 of 5.

A. The Sun is the oldest star.

B. The Sun is closer to Earth than are other stars.

C. The Sun's light reflects off the Moon.

D. The Sun is the biggest star.

Explanation: The Sun appears brighter because it is much closer to Earth compared to other stars, even though many stars are larger or more luminous.

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.