— CHAPTER MASTERY · CLASS 8

Keeping Time with the Skies Important Questions.

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Keeping Time with the Skies — Important Questions with Answers

Practice these Keeping Time with the Skies questions for Class 8 Science, each with the correct answer and a step-by-step explanation. Sign up free to practice all 25+ questions with adaptive difficulty.

  1. Q1Easy

    What is the phase of the Moon when it appears as a thin crescent just after the new Moon?

    • A.Waxing Crescent
    • B.Waning Gibbous
    • C.Full Moon
    • D.Third Quarter
    Answer: Waxing Crescent

    Explanation: The waxing crescent phase occurs shortly after the new Moon when a small sliver of the Moon becomes visible as it starts to move away from the position between the Earth and the Sun.

  2. Q2Easy

    Which of the following phases of the Moon is characterized by the Moon being fully illuminated as seen from Earth?

    • A.Waning Crescent
    • B.First Quarter
    • C.Full Moon
    • D.New Moon
    Answer: Full Moon

    Explanation: A full Moon occurs when the Earth is between the Sun and the Moon, allowing the entire face of the Moon to be illuminated by the Sun.

  3. Q3Easy

    What is the name of the period during which the illuminated portion of the Moon increases?

    • A.Krishna Paksha
    • B.Shukla Paksha
    • C.Amavasya
    • D.Purnima
    Answer: Shukla Paksha

    Explanation: The waxing period, known as Shukla Paksha in Indian tradition, is when the Moon’s visible surface grows from new Moon to full Moon.

  4. Q4Medium

    Which of these phases occurs when the Moon is directly opposite the Sun with Earth in between?

    • A.New Moon
    • B.First Quarter
    • C.Third Quarter
    • D.Full Moon
    Answer: Full Moon

    Explanation: During a full Moon, the Earth is positioned between the Sun and the Moon, causing the entire face of the Moon to be illuminated as seen from Earth.

  5. Q5Medium

    What is the approximate duration of one complete lunar cycle from new Moon to new Moon?

    • A.24 hours
    • B.29.5 days
    • C.365 days
    • D.30 days
    Answer: 29.5 days

    Explanation: A complete lunar cycle, known as a synodic month, takes approximately 29.5 days to go from one new Moon to the next.

  6. Q6Medium

    Which term is used in India to describe the waning period of the Moon?

    • A.Shukla Paksha
    • B.Amavasya
    • C.Purnima
    • D.Krishna Paksha
    Answer: Krishna Paksha

    Explanation: Krishna Paksha refers to the waning period of the Moon, during which the illuminated portion decreases from full Moon to new Moon.

  7. Q7Medium

    What is the primary reason for the changing appearance of the Moon?

    • A.Distance from Earth
    • B.Reflection of sunlight
    • C.Relative positions of the Sun, Earth, and Moon
    • D.Moon’s own light
    Answer: Relative positions of the Sun, Earth, and Moon

    Explanation: The Moon’s changing appearance is due to its orbit around Earth and the varying angles at which sunlight illuminates it as seen from Earth.

  8. Q8Medium

    Which calendar system is based on the principles of the Surya Siddhanta and is used in India?

    • A.Gregorian Calendar
    • B.Islamic Calendar
    • C.Chinese Calendar
    • D.Indian National Calendar
    Answer: Indian National Calendar

    Explanation: The Indian National Calendar follows the principles of the Surya Siddhanta and is used officially in India alongside the Gregorian Calendar.

  9. Q9Hard

    Which of these phases of the Moon is not visible from Earth?

    • A.Waxing Crescent
    • B.Waning Gibbous
    • C.New Moon
    • D.None of the phases are permanently invisible; all phases are visible at some point.
    Answer: None of the phases are permanently invisible; all phases are visible at some point.

    Explanation: All phases of the Moon are visible from Earth at some point during its orbit. However, the new Moon phase is not visible due to the alignment of the Sun, Earth, and Moon.

  10. Q10Hard

    What is the primary reason that the Moon rises about 50 minutes later each day?

    • A.Earth's rotation
    • B.Tidal forces
    • C.The Moon's orbit around Earth
    • D.Solar flares
    Answer: The Moon's orbit around Earth

    Explanation: The Moon's orbit around Earth causes it to shift its position relative to the Sun and Earth, resulting in a delay of approximately 50 minutes each day for moonrise.

  11. Q11Hard

    Which of these festivals in India is celebrated during the Full Moon phase?

    • A.Diwali
    • B.Holi
    • C.Ganesh Chaturthi
    • D.Eid
    Answer: Ganesh Chaturthi

    Explanation: Many Indian festivals such as Ganesh Chaturthi, Raksha Bandhan, and Navratri are celebrated during the Full Moon phase (Purnima).

  12. Q12Hard

    Which of the following is NOT a characteristic of the Indian National Calendar?

    • A.Based on Surya Siddhanta principles
    • B.Uses both lunar and solar cycles
    • C.Based solely on solar cycles
    • D.Follows a 354 or 355-day year
    Answer: Based solely on solar cycles

    Explanation: The Indian National Calendar is a luni-solar calendar, combining both lunar and solar cycles, unlike purely solar calendars.

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