Chapter-11 Keeping Time with the Skies — Online MCQ Test
SCIENCE (CURIOSITY) · CLASS 8th · Karnataka State Board
Practice Chapter-11 Keeping Time with the Skies with a free chapter-wise online MCQ test.
This chapter covers: celestial bodies - sundial - constellations - phases of the moon - rotation - revolution.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-11 Keeping Time with the Skies — Important Questions & Answers
What is the term used to describe the apparent daily motion of the sun across the sky?
- A. Revolution
- B. Rotation
- C. Diurnal motion
- D. Orbital motion
Answer: C. Diurnal motion
Diurnal motion refers to the apparent daily motion of celestial bodies across the sky due to Earth's rotation. This is why the sun appears to move from east to west.
Diurnal motion refers to the apparent daily motion of celestial bodies across the sky due to Earth's rotation. This is why the sun appears to move from east to west.
Which celestial body orbits around the Earth?
- A. The Sun
- B. The Moon
- C. Venus
- D. Mars
Answer: B. The Moon
The Moon is Earth's natural satellite and orbits around Earth. The sun is at the center of our solar system, while Venus and Mars orbit the sun, not Earth.
The Moon is Earth's natural satellite and orbits around Earth. The sun is at the center of our solar system, while Venus and Mars orbit the sun, not Earth.
What causes the sequence of day and night on Earth?
- A. Revolution of Earth around the Sun
- B. Rotation of Earth on its axis
- C. Orbital motion of the Moon
- D. Change in Earth's distance from the Sun
Answer: B. Rotation of Earth on its axis
The rotation of Earth on its axis causes different parts of Earth to face towards and away from the Sun alternately, producing the day-night cycle.
The rotation of Earth on its axis causes different parts of Earth to face towards and away from the Sun alternately, producing the day-night cycle.
What is the relationship between the phases of the Moon and the relative positions of the Earth, Moon, and Sun?
- A. The phases depend only on Earth's rotation
- B. The phases are determined by the angle between the Moon's orbital plane and Earth's equator
- C. The phases result from the Moon's position in its orbit around Earth relative to the Sun's direction
- D. The phases are random and unpredictable
Answer: C. The phases result from the Moon's position in its orbit around Earth relative to the Sun's direction
As the Moon orbits Earth, its position relative to the Sun changes from our perspective. When the Moon is between Earth and Sun, we see a new moon; when it's on the opposite side, we see a full moon; other positions show intermediate phases.
As the Moon orbits Earth, its position relative to the Sun changes from our perspective. When the Moon is between Earth and Sun, we see a new moon; when it's on the opposite side, we see a full moon; other positions show intermediate phases.
If you could observe the sun's position in the sky every day at the same clock time, you would notice it traces a figure-eight pattern over a year. What is this phenomenon called, and what causes it?
- A. The analemma, caused by Earth's elliptical orbit and axial tilt combined effects
- B. A solar eclipse pattern
- C. Precession of Earth's axis
- D. The moon's orbital plane
Answer: A. The analemma, caused by Earth's elliptical orbit and axial tilt combined effects
The analemma is the figure-eight pattern traced by the sun when observed at the same clock time daily. It results from combining two effects: Earth's elliptical orbit (which varies the sun's apparent east-west position) and the axial tilt (which varies its north-south position).
The analemma is the figure-eight pattern traced by the sun when observed at the same clock time daily. It results from combining two effects: Earth's elliptical orbit (which varies the sun's apparent east-west position) and the axial tilt (which varies its north-south position).