Gr 8 Natural Sciences Ch 4.1: The Sun

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Questions and Answers

What is the nature of the Sun's surface?

  • An invisible layer of gas
  • A solid layer of gas
  • A liquid layer of gas
  • A visible layer of dense gas (correct)

Why do sunspots appear to move on the Sun's surface?

  • Due to their own inherent motion
  • Due to solar wind and corona
  • Due to changes in the Sun's energy output
  • Because of the Sun's rotation on its axis (correct)

What is the duration of the solar cycle?

  • 11-year cycle (correct)
  • 13-year cycle
  • 12-year cycle
  • 10-year cycle

What is the solar wind composed of?

<p>Gas particles released from the corona (B)</p> Signup and view all the answers

How can sunspots be tracked in real-time?

<p>Through various astronomical resources (A)</p> Signup and view all the answers

What is the primary composition of the Sun?

<p>Hydrogen and helium (A)</p> Signup and view all the answers

What is the process by which the Sun generates energy?

<p>Nuclear fusion (B)</p> Signup and view all the answers

What is the surface temperature of the Sun?

<p>5500°C (C)</p> Signup and view all the answers

What is the purpose of a filter or pinhole projector when observing the Sun?

<p>To protect the eyes from damage (D)</p> Signup and view all the answers

What is the term for the movement of fluid caused by differences in temperature and density within the fluid?

<p>Convection (B)</p> Signup and view all the answers

What is the term for the cooler, dark areas on the Sun's surface?

<p>Sunspots (D)</p> Signup and view all the answers

What is the term for the stream of charged particles released from the upper atmosphere of the Sun?

<p>Solar wind (D)</p> Signup and view all the answers

What equation describes the energy released by the Sun's nuclear fusion reactions?

<p>E = mc^2 (D)</p> Signup and view all the answers

What is the primary reason the Sun is essential for life on Earth?

<p>It provides light and heat (A)</p> Signup and view all the answers

Which of the following processes occurs in the Sun's core?

<p>Nuclear fusion (D)</p> Signup and view all the answers

Why is it dangerous to look directly at the Sun?

<p>It can cause permanent eye damage (D)</p> Signup and view all the answers

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

<p>15,000,000°C (C)</p> Signup and view all the answers

How does the energy generated in the Sun's core reach the Earth?

<p>Through the spread of heat and light (D)</p> Signup and view all the answers

What is the composition of sunspots?

<p>Cool, dark gas (C)</p> Signup and view all the answers

What is the Sun's role in the solar system?

<p>It is the center of the solar system (D)</p> Signup and view all the answers

What is the term for the collection of planets and other celestial bodies that orbit the Sun?

<p>Solar system (A)</p> Signup and view all the answers

What occurs on the Sun's surface during a solar flare?

<p>A sudden release of significant amounts of energy and particles (A)</p> Signup and view all the answers

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

<p>To safely study the Sun and its activity (D)</p> Signup and view all the answers

What is the correlation between the number of sunspots and the Sun's energy output?

<p>The number of sunspots varies in an 11-year cycle, correlating with the Sun's energy output (D)</p> Signup and view all the answers

What is the outer atmosphere of the Sun that releases gas particles into space?

<p>The corona (B)</p> Signup and view all the answers

What is the visible layer of dense gas on the Sun's surface that becomes opaque?

<p>The photosphere (A)</p> Signup and view all the answers

What percentage of the Sun's composition is made up of elements other than hydrogen and helium?

<p>5% (C)</p> Signup and view all the answers

What is the primary mechanism by which the energy generated in the Sun's core is transferred to its surface?

<p>Convection (A)</p> Signup and view all the answers

What is the temperature difference between the Sun's surface and its core?

<p>14.5 million °C (B)</p> Signup and view all the answers

What is the reason why sunspots appear darker than the surrounding areas on the Sun's surface?

<p>They have a lower temperature (D)</p> Signup and view all the answers

What is the approximate time it takes for energy generated in the Sun's core to reach its surface?

<p>17,000 to 100,000 years (C)</p> Signup and view all the answers

What is the term for the reaction that occurs in the Sun's core, where hydrogen nuclei combine to form helium?

<p>Nuclear fusion (C)</p> Signup and view all the answers

What is the primary reason why the Sun appears as a small, bright point of light in the night sky?

<p>Due to its immense distance from Earth (D)</p> Signup and view all the answers

What is the process by which the energy released from the Sun is transferred to the Earth?

<p>Radiation (A)</p> Signup and view all the answers

What is the primary reason for the 11-year solar cycle?

<p>Changes in the Sun's magnetic field (D)</p> Signup and view all the answers

What is the primary consequence of a solar flare?

<p>A sudden increase in the Sun's energy output (D)</p> Signup and view all the answers

What is the primary purpose of using images and videos from sources like the SOHO space satellite?

<p>To track the movement of sunspots (C)</p> Signup and view all the answers

What is the relationship between the number of sunspots and the Sun's energy output?

<p>The number of sunspots is directly proportional to the Sun's energy output (C)</p> Signup and view all the answers

What is the term for the visible layer of dense gas on the Sun's surface that becomes opaque?

<p>Photosphere (B)</p> Signup and view all the answers

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