Keeping Time with the Skies Class 8 MCQ
hardKeeping Time with the Skies Class 8 MCQ
Keeping Time with the Skies Class 8 MCQ
Question 1.
What causes the phases of the Moon?
(a) The Earth's shadow blocking sunlight
(b) The Moon's rotation on its axis
(c) The Moon's position relative to the Earth and Sun
(d) The Sun's brightness changing
Answer:
(c) The Moon's position relative to the Earth and Sun
Question 2.
How long does it take for the Moon to complete one full cycle of its phases?
(a) 24 hours
(b) 29.5 days
(c) 30 days
(d) 365 days
Answer:
(b) 29.5 days
Question 3.
Which of the following statements is true regarding lunar calendars?
(a) They are based solely on the solar cycle.
(b) They do not account for the seasons.
(c) They are based on the phases of the Moon.
(d) They are used only in Western cultures.
Answer:
(b) They do not account for the seasons.
Question 4.
What is an intercalary month, also known as Adhika Maasa?
(a) A month with 28 days
(b) An extra month added to align lunar and solar calendars
(c) A month with no days
(d) A month that occurs every year
Answer:
(b) An extra month added to align lunar and solar calendars
Question 5.
Which phase of the Moon is visible when the Moon is overhead at sunset?
(a) New Moon
(b) First Quarter
(c) Full Moon
(d) Last Quarter
Answer:
(c) Full Moon
Question 6.
What is the primary reason we can only see part of the Moon?
(a) The Moon is too far away
(b) The Moon does not reflect sunlight
(c) The Moon's surface is not smooth
(d) It only reflects sunlight that reaches Earth
Answer:
(d) It only reflects sunlight that reaches Earth
Question 7.
In which type of calendar does the new month start on the first day after the new Moon?
(a) Gregorian calendar
(b) Purnimant calendar
(c) Amant calendar
(d) Solar calendar
Answer:
(c) Amant calendar
Question 8.
How does the date of Eid-ul-Fitr change each year in the Gregorian calendar?
(a) It stays the same every year
(b) It moves earlier by about 11 days each year
(c) It moves later by about 11 days each year
(d) It changes randomly
Answer:
(d) It changes randomly
Question 9.
What is the duration of a solar day?
(a) 23 hours and 56 minutes
(b) 24 hours
(c) 25 hours
(d) 24 hours and 50 minutes
Answer:
(d) 24 hours and 50 minutes
Question 10.
Which of the following is NOT a characteristic of the Indian National Calendar?
(a) It is a solar calendar
(b) It has 365 days in a year
(c) It begins on 22 March
(d) It has months with only 28 days
Answer:
(d) It has months with only 28 days
Case Study
I. The Moon's Changing Phases
The Moon's appearance changes throughout the month due to its orbit around Earth. As it moves, the relative positions of the Sun, Earth, and Moon create different phases, from new Moon to full Moon. Observing these phases helps us understand celestial mechanics and the lunar cycle, which has been crucial for ancient and modern calendars alike.
Question 1.
What causes the different phases of the Moon?
(a) The Earth's shadow falling on the Moon
(b) The relative positions of the Sun, Earth, and Moon
(c) The Moon's rotation on its axis
(d) The Moon's distance from the Earth
Answer:
(b) The relative positions of the Sun, Earth, and Moon
Question 2.
How long does it take for the Moon to complete one full cycle of phases?
(a) 24 hours
(b) 29.5 days
(c) 365 days
(d) 12 months
Answer:
(b) 29.5 days
Question 3.
The cycle of the Moon's phases is the basis for a ............, which is a unit of time measuring approximately 29.5 days.
Answer:
month
Question 4.
A ............ occurs when the Earth's shadow falls on the Moon, which can only happen during a full Moon.
Answer:
lunar eclipse
Question 5.
The phases of the Moon occur because the Moon is in the Earth's shadow. (True/False)
Answer:
False
II. The Role of Artificial Satellites
Artificial satellites, such as those launched by the Indian Space Research Organisation (ISRO), play a vital role in modern society. Orbiting approximately 800 km above Earth, these satellites facilitate communication, navigation, and weather monitoring. Their periodic orbits, taking about 100 minutes to complete, allow for continuous data collection and support various scientific and practical applications.
Question 1.
What is the approximate altitude at which most artificial satellites orbit the Earth?
(a) 400 km
(b) 800 km
(c) 1200 km
(d) 1600 km
Answer:
(b) 800 km
Question 2.
How long does it typically take for an artificial satellite to complete one orbit around the Earth?
(a) 30 minutes
(b) 60 minutes
(c) 100 minutes
(d) 120 minutes
Answer:
(c) 100 minutes
Question 3.
Artificial satellites are used for various purposes, including ............, navigation, and weather monitoring.
Answer:
communication
Question 4.
The Indian Space Research Organisation (ISRO) has launched many satellites, such as the ............series, which captures high-quality images of the Earth.
Answer:
Cartosat
Question 5.
Artificial satellites do not have a periodic orbit and can remain stationary relative to the Earth. (True/False)
Answer:
False