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Class 8 Exam > Class 8 Notes > Science Curiosity Class 8 - New NCERT > Very Short Answer Questions: Keeping Time with the Skies

Very Short Answer Questions: Keeping Time with the Skies | Science Curiosity Class 8 - New NCERT PDF Download

Q1. What are the changing shapes of the Moon’s bright portion called?
Ans: They are called the phases of the Moon.

Very Short Answer Questions: Keeping Time with the Skies | Science Curiosity Class 8 - New NCERT

Q2. What is the Indian term for the waning period of the Moon?
Ans: It is called Krishna Paksha.

Q3. On which day is the Moon not visible at all?
Ans: On the new Moon day (Amavasya) the Moon is not visible.

Q4. What is the Indian term for the waxing period of the Moon?
Ans: It is called Shukla Paksha.

Q5. How long does it take the Moon to complete one full cycle of phases?
Ans: It takes about one month.

Q6. What is the term for a Moon that is more than half but not fully lit?
Ans: Such a Moon is called a gibbous Moon.

Q7. What is the term for a Moon that is less than half lit?
Ans: Such a Moon is called a crescent Moon.

Q8. On a full Moon day, where is the Moon when the Sun rises in the east?
Ans: It is almost setting in the west.

Q9. When is a waxing Moon best seen?
Ans: A waxing Moon is best seen at sunset.

Q10. By how much does the moonrise time change each day?
Ans: Moonrise occurs about 50 minutes later each day.

Q11. Why can we sometimes see the Moon during the daytime?
Ans: Because the Moon can rise in the afternoon before sunset.

Q12. Does the Moon produce its own light?
Ans: No, it reflects sunlight.

Q13. At any moment, what fraction of the Moon is illuminated by sunlight?
Ans: Half of the Moon is illuminated by sunlight at any moment.

Q14. What actually causes the phases of the Moon?
Ans: They are caused by the changing positions of the Moon, Earth, and Sun.

Q15. When can a lunar eclipse occur?
Ans: It can occur only on a full Moon day.

Q16. When can a solar eclipse occur?
Ans: It can occur only on a new Moon day.

Q17. Why don’t eclipses happen every month?
Ans: Because the Moon’s orbit is tilted compared to Earth’s orbit.

Very Short Answer Questions: Keeping Time with the Skies | Science Curiosity Class 8 - New NCERT

Q18. What is a mean solar day?
Ans: It is the time from one noon to the next, about 24 hours.

Q19. How long is one lunar month?
Ans: About 29.5 days.

Q20. How many days does Earth take to revolve once around the Sun?
Ans: About 365¼ days.

Q21. How many days are there in a lunar year of 12 months?
Ans: About 354 days.

Q22. What is the first month in the Indian National Calendar?
Ans: The first month is Chaitra.

Q23. On which date does the Indian National Calendar begin in a normal year?
Ans: It begins on 22 March.

Q24. Who headed the Calendar Reform Committee that designed the Indian National Calendar?
Ans: It was headed by Meghnad Saha.

Q25. Who is known as the Father of the Indian Space Programme?
Ans: Vikram Sarabhai is known as the Father of the Indian Space Programme.

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FAQs on Very Short Answer Questions: Keeping Time with the Skies - Science Curiosity Class 8 - New NCERT

1. What are the primary methods used historically to keep time with the skies?

Ans. Historically, people have used various methods to keep time with the skies, including sundials that measure the position of the sun, water clocks that rely on the steady flow of water, and celestial navigation that uses stars and constellations to determine time and location.

2. How did ancient civilizations rely on celestial bodies for timekeeping?

Ans. Ancient civilizations, such as the Babylonians and Egyptians, relied on celestial bodies by observing the movements of the sun, moon, and stars. They created calendars based on lunar cycles and solar positions to track time for agricultural activities, religious events, and daily life.

3. What is the significance of the sundial in timekeeping history?

Ans. The sundial is significant in timekeeping history as one of the earliest tools developed for measuring time based on the sun's position. It provided a visual representation of time during daylight hours and laid the foundation for more advanced timekeeping devices.

4. How did the invention of the mechanical clock change timekeeping practices?

Ans. The invention of the mechanical clock in the Middle Ages revolutionized timekeeping by providing a more accurate and reliable method to measure time. It allowed for standardized timekeeping, which was essential for coordinating activities in growing cities and during trade.

5. What role did the study of astronomy play in advancements in timekeeping?

Ans. The study of astronomy played a crucial role in advancements in timekeeping by enabling scientists and mathematicians to understand the movements of celestial bodies. This knowledge facilitated the development of calendars, improved navigational techniques, and led to the precise measurement of time through devices like the astrolabe and later, the pendulum clock.

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