Astronomy Unit 2 Test

Which of the following is a sun structure where electromagnetic energy pools or gathers, causing a darker spot to appear?

• Prominence

• Sunspot

• Solar flare

• Coronal mass ejection

Answer explanation

A sunspot is a region on the sun's surface where electromagnetic energy is concentrated, resulting in a cooler area that appears darker than its surroundings. This makes 'sunspot' the correct answer.

Which statement is true about the Sun?

• It is a star

• It is the largest star in our galaxy

• It is a planet close to Earth

• It is a moon

Answer explanation

The correct statement is 'It is a star' because the Sun is a massive ball of gas undergoing nuclear fusion, classifying it as a star. The other options incorrectly describe it as a planet or moon.

Nuclear fusion is the process by which the Sun produces energy. In which part of the Sun does nuclear fusion occur?

• Photosphere

• Corona

• Core

• Radiative zone

Answer explanation

Nuclear fusion occurs in the core of the Sun, where temperatures and pressures are extremely high, allowing hydrogen atoms to combine and release energy. The other layers, like the photosphere and corona, do not facilitate fusion.

Which layer of the sun is the hottest?

• Photosphere

• Chromosphere

• Corona

• Core

Answer explanation

The core of the sun is the hottest layer, reaching temperatures around 15 million degrees Celsius. It is where nuclear fusion occurs, producing the energy that powers the sun, unlike the cooler outer layers like the photosphere and corona.

The heat transfer method used on the surface of the Sun is (a)  

• Conduction

• Convection

• Radiation

• Fission

Answer explanation

The heat transfer method on the Sun's surface is convection, where hot plasma rises, cools, and sinks, creating a cycle. Conduction and radiation are less significant in this context, while fission refers to nuclear reactions, not heat transfer.

What is the primary element that fuels the Sun's nuclear fusion process?

• Helium

• Hydrogen

• Carbon

• Oxygen

What is the approximate temperature of the Sun's core?

• 5,500 degrees Celsius

• 15 million degrees Celsius

• 1 million degrees Celsius

• 10,000 degrees Celsius

Which phenomenon occurs when the Sun's magnetic field lines snap and release energy?

• Solar wind

• Solar flare

• Sunspot

• Coronal loop

Label part 5 What we see when we view the sun

• #5 Chromosphere

• #5 Radiation zone

• #5 Convection zone

• #5 Photosphere

Nuclear fusion occurs in the sun's ​ (a)   where ​ (b)   is converted into ​ (c)  

• core
• hydrogen
• helium
• corona
• iron
• photosphere