Unit 1 - Astronomy

(1) Which of the following characteristics distinguishes jovian planets (gas giants) from terrestrial planets?

• A. They have solid surfaces
• B. They are smaller in size
• C. They have thicker atmospheres composed primarily of hydrogen and helium
• D. They are located closer to the Sun

(2) Why is the nebular hypothesis important in understanding the formation of our solar system?

• A. It explains the formation of galaxies.
• B. It predicts the existence of black holes.
• C. It provides a framework for understanding the formation of planets and the Sun.
• D. It describes the evolution of life on Earth.

(3) Arrange the following steps in the correct sequence according to the nebular theory of solar system formation: I. Formation of a protostar from gravitational collapse. II. Condensation of solid particles in the protoplanetary disk. III. Formation of planetesimals through accretion. IV. Formation of a protoplanetary disk from a rotating nebula.

• A. IV, I, III, II
• B. I, II,III, IV
• C. II, IV, III, I
• D. I, IV, II, III

(4) Which of the following groups correctly classifies the planets in the solar system according to their size and location?

• A. Terrestrial planets: Mercury, Venus, Earth, Mars; Jovian planets: Jupiter, Saturn, Uranus, Neptune
• B. Terrestrial planets: Jupiter, Saturn, Uranus, Neptune; Jovian planets: Mercury, Venus, Earth, Mars
• C. Terrestrial planets: Jupiter, Saturn, Uranus, Neptune; Jovian planets: Mercury, Venus, Earth, Mars
• D. Terrestrial planets: Mercury, Venus, Earth, Mars; Jovian planets: Uranus, Neptune, Jupiter, Saturn

(5) What role does gravity primarily play in the formation of astronomical objects such as stars and planets?

• A. It causes nuclear fusion reactions.
• B. It prevents collisions between objects.
• C. It causes the collapse of gas and dust clouds.
• D. It produces electromagnetic radiation.

(6) Compared to the distance between Earth and Mars, the distance between Jupiter and Saturn is ______.

• A. much smaller
• B. about the same
• C. just slightly less
• D. much larger

(7) Which natural phenomenon occurs as a result of Earth rotating on its axis?

• A. Movement of tectonic plates
• B. Deep ocean currents
• C. Seasonal changes
• D. Day and night

(8) How does the tilt of Earth’s axis affect the season?

• A. By changing the amount of direct solar energy reaching the surface of Earth
• B. By influencing the rate of chemical reactions occurring in the atmosphere
• C. By deflecting the harmful rays of radiation emitted by the sun
• D. By changing the speed of the rotation of Earth

(9) Which statement describes the motion of Earth around the sun?

• A. The speed of Earth is constant regardless of its distance from the sun.
• B. Speed increases the closer Earth is to the sun and decreases the farther it is from the sun
• C. The speed of Earth is constant because the distance remains the same between earth and the sun
• D. Speed increases the farther Earth is from the sun and decreases the closer it is to the sun

(10) According to the Tides Chart below which best describes the pattern of tides shown

• A. Two high tides and two low tides each day
• B. One high tide and one low tides each day
• C. Three high tides and three low tides each day
• D. One high tide and two low tides each day