Students can practice the best Class 8 Science MCQ and Keeping Time with the Skies Class 8 Science Curiosity Chapter 11 MCQ Online Test with Answers for exam preparation.
Class 8 Science Chapter 11 Keeping Time with the Skies MCQ
Keeping Time with the Skies MCQ
Class 8 Science Chapter 11 MCQ Online Test
Question 1.
Why can the Moon sometimes be seen during the afternoon?
(a) It has its own light
(b) It is closer to Earth than the Sun
(c) It reflects sunlight and rises earlier in the day
(d) It is always opposite the Sun
Answer:
(c) It reflects sunlight and rises earlier in the day
Question 2.
Which phase comes approximately one week after full Moon?
(a) Waxing crescent
(b) Waning gibbous
(c) New moon
(d) First quarter
Answer:
(b) Waning gibbous
Question 3.
Which event occurs when the Moon is between Earth and Sun?
(a) Full Moon
(b) Lunar eclipse
(c) New Moon
(d) Waning phase
Answer:
(c) New Moon
Question 4.
A calendar with 354 days is known as a
(a) Sidereal calendar
(b) Solar calendar
(c) Lunar calendar
(d) Equinox calendar
Answer:
(c) Lunar calendar
Question 5.
Leap years are skipped every 100 years unless the year is divisible by
(a) 10
(b) 100
(c) 50
(d) 400
Answer:
(d) 400
Question 6.
The Adhika Maasa is added to
(a) Add a new festival
(b) Make calendars lunar
(c) Balance lunar and solar calendars
(d) Skip leap years
Answer:
(c) Balance lunar and solar calendars
Question 7.
The Moon rises 50 minutes later each day because (Competency Based Que.)
(a) Earth’s rotation slows down
(b) The Moon orbits Earth
(c) The Sun sets earlier
(d) The Moon grows in size
Answer:
(b) The Moon orbits Earth
Question 8.
In which direction does the Moon usually rise?
(a) North
(b) South
(c) East
(d) West
Answer:
(c) East
Question 9.
Which phase of the Moon comes immediately after the first quarter and is characterised by more than half of its disk being iluminated?
(a) Waxing crescent
(b) Waxing gibbous
(c) Waning gibbous
(d) Last quarter
Answer:
(b) Waxing gibbous
Question 10.
Which type of calendar do astronomers use to track Earth’s position with respect to stars?
(a) Lunar
(b) Sidereal
(c) Solar
(d) Luni-solar
Answer:
(b) Sidereal
Question 11.
Which phase of the Moon is charaterised by only a sliver of illumination that grows smaller each night?
Answer:
Question 12.
The Indian National calendar (Saka) begins its year on which date of the greogrian calendar ?
(a) 1 January
(b) 15 April
(c) 22 March
(d) 23 September
Answer:
(c) 22 March
Question 13.
Which Indian scientist chaired the Calendar Reform Committee?
(a) Vikram Sarabhai
(b) Homi Bhabha
(c) C.V. Raman
(d) Meghnad Saha
Answer:
(d) Meghnad Saha
Question 14.
Artificial satellites appear to move in the night sky because
(a) They shine with solar power
(b) They orbit Earth at high speed
(c) Their light travels faster
(d) They are closer than stars
Answer:
(b) They orbit Earth at high speed
Question 15.
On which day is the Moon closest to the Sun in the sky?
(a) Full Moon
(b) New Moon
(c) First Quarter
(d) Last Quarter
Answer:
(b) New Moon
Question 16.
The time between two identical Moon phases is about
(a) 24 hours
(b) 15 days
(c) 29.5 days
(d) 365 days
Answer:
(c) 29.5 days
Question 17.
What is the name of the Moon phase when more than half but not full is visible?
(a) Crescent
(b) Full Moon
(c) Gibbous
(d) First Quarter
Answer:
(c) Gibbous
Question 18.
Which Indian scientist worked on star temperatures and calendar reform?
(a) C.V. Raman
(b) Vikram Sarabhai
(c) Meghnad Saha
(d) Homi Bhabha
Answer:
(c) Meghnad Saha
Question 19.
Which of the following is a solar-based Indian festival?
(a) Diwali
(b) Eid
(c) Pongal
(d) Buddha Purnima
Answer:
(c) Pongal
Keeping Time with the Skies Class 8 Assertion Reason Questions
The following questions consist of two statements. Assertion (A) and Reason (R). Answer the following questions by selecting the appropriate option given below
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) Both A and R are false.
Question 1.
Assertion (A) Lunar calendars don’t align with seasons.
Reason(R) A lunar year has fewer days than a solar year.
Answer:
(a) Both A and R true, R explains A.
Question 2.
Assertion (A) Moon phases occur due to Earth’s shadow.
Reason (R) Earth blocks sunlight reaching the Moon.
Answer:
(d) Both A and R are false.
Question 3.
Assertion (A) On Full Moon day, the Moon is visible all night.
Reason (R) The Moon is on the opposite side of Earth from the Sun.
Answer:
(a) At full Moon the Sun-Earth-Moon are aligned with Earth in between. This geometry makes the Moon rise at sunset and set at sunrise, so it is indeed up throughout the night.
Question 4.
Assertion (A) Diwali date changes each year in the Gregorian calendar.
Reason (R) It follows a pure solar calendar.
Answer:
(c) A is true but R is false.
Question 5.
Assertion (A) Luni-solar calendars are used in India for festivals.
Reason (R) They help adjust lunar months to the solar year.
Answer:
(a) By adding an extra month (Adhika Maasa) occasionally, the lunar months stay roughly in sync with the seasons.
Question 6.
Assertion (A) Leap years are added every 4 years in the Gregorian calendar.
Reason (R) The Earth takes 365 1/4 days to revolve around the Sun.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Question 7.
Assertion (A) The Moon is always visible only at night.
Reason (R) Moonlight is too dim to be seen in daytime.
Answer:
(d) A is false, but R is true.
Question 8.
Assertion (A) Sidereal year is longer than tropical year.
Reason (R) It is calculated with reference to stars.
Answer:
(a) Both A and R are true and R is the correct explanation of A.
Keeping Time with the Skies Class 8 Case Based MCQ Questions
Question 1.
Raghav noticed that the Moon was visible late into the morning for several days. Initially, it appeared almost full, but over the week, it kept shrinking. Curious, he checked a lunar calendar and saw that the festival of Krishna Janmashtami was approaching, which is celebrated during the waning phase. He also read that the Moon rises about 50 minutes later every day. He observed the Moon rising at 9:30 pm and then around 10:20 pm the next day.
(Competency Based Que.)
(i) What phase of the Moon was Raghav likely observing at the beginning of the week?
(a) Waxing Gibbous
(b) Full Moon
(c) Waning Gibbous
(d) New Moon
Answer:
(c) Waning Gibbous
(ii) Krishna Janmashtami falls in which part of the lunar cycle?
(a) Waxing Crescent
(b) Waning Phase
(c) Full Moon
(d) New Moon
Answer:
(b) Waning Phase
(iii) The Moon rising 50 minutes later each day is due to
(a) Earth’s titled axis
(b) Earth’s rotation slowing down
(c) Moon moving in its orbit around Earth
(d) Change in Sun’s position
Answer:
(c) Moon moving in its orbit around Earth
(iv) If today is Ashtami of Krishna Paksha, what phase will the Moon show?
(a) Half Moon
(b) Almost invisible crescent
(c) Full Moon
(d) Waxing Gibbous
Answer:
(a) Half Moon
Keeping Time with the Skies Class 8 Fill in the blanks
1. The Moon reflects ____________ to become visible from Earth.
Answer:
Sunlight
2. The ____________ calendar is based on the Earth’s orbit around the Sun.
Answer:
Solar
3. The Moon takes about ____________ days to complete one cycle of phases.
Answer:
29.5
4. The Indian National Calendar starts on ____________ March every year.
Answer:
22
5. The ____________ phase occurs when the Moon’s visible part increases.
Answer:
waxing
Keeping Time with the Skies Class 8 True or False
1. The Moon emits its own light.
Answer:
False
2. A full Moon appears when the Moon is between Earth and the Sun.
Answer:
False
3. The leap year adjustment helps keep the calendar aligned with seasons.
Answer:
True
4. Makar Sankranti falls on different dates each year in the Gregorian calendar.
Answer:
False
5. Artificial satellites orbit Earth and are visible as moving points of light.
Answer
True
Keeping Time with the Skies Class 8 Match the following
Question 1.
Match the following Moon phases with their correct descriptions:
| Column I | Column II |
| A. Full Moon | 1. The Moon is completely invisible |
| B. First Quarter | 2. Only a small part is illuminated and growing |
| C. Waxing Crescent | 3. Right half of Moon is visible |
| D. New Moon | 4. The entire face of Moon is visible |
Answer:
A – 4, B – 3, C – 2, D – 1
| Column I | Column II |
| A. Full Moon | 4. The entire face of Moon is visible |
| B. First Quarter | 3. Right half of Moon is visible |
| C. Waxing Crescent | 2. Only a small part is illuminated and growing |
| D. New Moon | 1. The Moon is completely invisible |
Question 2.
Match the following calendar types with their key features:
| Column I | Column II |
| A. Solar calendar | 1. Based on Moon phases, used for Islamic festivals |
| B. Lunar calendar | 2. Based on Earth’s orbit around the Sun |
| C. Luni-solar calendar | 3. Adds Adhika Maasa to adjust with seasons |
| D. Sidereal calendar | 4. Used by astronomers to track Earth’s orbit via stars |
Answer:
A – 2, B – 1, C – 3, D – 4
| Column I | Column II |
| A. Solar calendar | 2. Based on Earth’s orbit around the Sun |
| B. Lunar calendar | 1. Based on Moon phases, used for Islamic festivals |
| C. Luni-solar calendar | 3. Adds Adhika Maasa to adjust with seasons |
| D. Sidereal calendar | 4. Used by astronomers to track Earth’s orbit via stars |