Earth and Life Science Grade 11 Quiz

What is the term used to describe the process by which planets form from the gradual accumulation of smaller particles?

• a. fusion

• b. accumulation

• c. accretion

• d. sublimation

In the process of accretion, what role does gravity play?

• a. It repels smaller particles away from each other.

• b. It attracts and draws together smaller particles to form a larger body.

• c. It causes particles to disintegrate.

• d. It has no significant role in the process.

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What is the initial stage of the accretion process?

• a. Planetesimal Formation

• b. Planetary Growth

• c. Initial Dust and gas

• d. None of these

During the Planetesimal Formation stage, what happens to the small clumps of particles?

• a. They disperse into space.

• b. They begin nuclear fusion.

• c. They transform into stars.

• d. They attract and collide, gradually growing into planetesimals.

Which of the following best describes the process that leads to the formation of a planet from planetesimals?

• a. Planetesimals continue to collide and merge, eventually forming a planet.

• b. Planetesimals evaporate, leaving behind a planet.

• c. Planetesimals shrink until they form a planet.

• d. Planetesimals undergo nuclear fusion to form a planet.

Which element is not mentioned as a common component in the formation of planets?

• a. Helium

• b. Nickel

• c. Silicon

• d. Iron

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Which of the following elements are commonly found in the rocky composition of planets like Earth?

• a. Nickel and gold, Iron and silicon

• b. Iron, Silicon, and Magnesium

• c. Ammonia, Iron, helium

• d. None of these

Tags

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What is the role of collisions between planetesimals in the process of accretion?

• a. To cool down the planetesimals

• b. To facilitate their growth and eventual formation of a planet

• c. To increase the distance between planetesimals

• d. none of these

How does the distribution of materials in the protoplanetary disk affect the outcome of accretion?

• a. It makes the disk hotter

• b. It leads to variations in the composition and structure of the planet

• c. It speeds up the rotation of the central star

• d. None of these

Which factor is NOT mentioned as influencing the rate and outcome of accretion?

• a. Gravitational pull of the central star

• b. Frequency and intensity of collisions between planetesimals

• c. Distribution of materials in the protoplanetary disk

• d. The magnetic field of the central star