Students can use Class 7 Science Curiosity Extra Questions and Chapter 12 Earth Moon and the Sun Extra Question Answer to prepare effectively at home.
Class 7 Science Chapter 12 Earth Moon and the Sun Extra Questions
Class 7 Science Chapter 12 Extra Questions on Earth Moon and the Sun
Earth Moon and the Sun Class 7 Very Short Question Answer
Question 1.
What would happen if the Earth rotated from east to west instead?
Answer:
If the earth rotated from east to west, the sun would appear to rise in the west and set in the east.
Question 2.
What is the Earth’s axis?
Answer:
It is an imaginary line passing through the North and South Poles around which the Earth rotates.
Question 3.
What direction does the Sun appear to move in the sky?
Answer:
The Sun appears to move from east to west in the sky.
Question 4.
What causes the apparent movement of stars in the night sky?
Answer:
The Earth’s rotation makes stars appear to move from east to west.
Question 5.
What is meant by the term “revolution” in the context of Earth?
Answer:
It refers to the movement of the Earth around the Sun.
Question 6.
What is the Big Dipper called in Indian astronomy?
Answer:
Saptarishi.
Question 7.
Name the two solstices experienced in a year.
Answer:
Summer solstice and winter solstice.
Question 8.
What happens on 21st June in the Northern Hemisphere?
Answer:
It is the longest day, known as the summer solstice.
Question 9.
What are equinoxes?
Answer:
Days when day and night are of equal length, around 21 March and 23 September.
Question 10.
What is a lunar eclipse?
Answer:
It happens when the Earth comes between the Sun and the Moon, casting a shadow on the Moon.
Question 11.
Can we safely view a lunar eclipse with the naked eye?
Answer:
Yes, it is safe to view a lunar eclipse without any eye protection.
Question 12.
Why can’t Mercury or Venus block the Sun completely?
Answer:
Because they are too small and too far from Earth.
Question 13.
What is the name of the Indian observatory in Tamil Nadu for solar studies?
Answer:
Kodaikanal Solar Observatory.
Question 14.
Who was M.K. Vainu Bappu?
Answer:
A famous Indian astronomer known as the father of modern Indian astronomy.
Earth Moon and the Sun Class 7 Short Question Answer
Question 1.
How do planets move?
Answer:
They move around some special point in solar system. The solar system is very much close to Sun. It is not in center of Sun. Also sun moves around a same point. (not completely reamin still too). The role of our scientist is to use such minute wobble in moving other stars. This is to discover exoplanets around them also.
Question 2.
What is an eclipse known as? Name a text for its reference.
Answer:
An eclipse is known as Grahan in Sanskrit language. Many Indian text give reference to it one text is Surya Siddhanta. It is written in Sanskrit language. It is a poetry tradition. It is written as rhythmic shlokas. Some Indian text books give calculations for predicting eclipses. These are old astronomical texts.
Question 3.
When does Lunar eclispse occurs? (M.Imp.)
Answer:
Moon revolves around Earth. Earth blocks sunlight from reaching the moon. It is refered to lunar eclipse. The shadow of Earth falls on Moon (at its full disc too). Moon fully covers Earth’s shadow, the total lunar eclipse takes place.
Question 4.
What is Kodai Kamal Solar observatory located? What is its role?
Answer:
Kodaikamal Observatory is located in Kodaikamal in Tamil Nadu state of India. This lies in beautiful range of Pilani Hills of India in Tamil Nadu. This was established in the year 1899. Its role is to provide datas about Sun and approxiamately for about 100 years time. This is operated by IIA, Bengaluru (Bangalore).
Question 5.
How does a partial lunar eclipse occur?
Answer:
The part of moon lies in shadow of Earth, but we can see rest of the moon. Moon is visible in fraction of it. This is referred to as partial lunar eclipse. One can see it by its own naked eyes too.
Question 6.
What do you know about Stellarium app?
Answer:
This is a computer generated app about stellarium. It is free of cost. Anyone can see it free. No cost is charged at all. So by it, we get information about upcoming solar eclipse. We also can get information about lunar eclipse too by this app. Solar and lunar eclipses that occur can be seen at your home location.
Question 7.
Write what you know about Transit of Venus?
Answer:
This is an event. It occurs when Venus passes between Earth and Sun. This is seen as a tiny dot that is black in colour. It occurs against bright face of sun. Mercury, Venus, both are larger to Moon in size too. They are also farther to Earth but when compared to Moon’s size. They seem smaller to Sun. So, it is not possible to block the Sun by them also.
Question 8.
What happens on 21st March and 22nd September in North and South Poles.
Answer:
21st March: At North Pole, Sun rises in East on a Equinox Day.
22nd September: At South Pole, Sun sets on this day, South Pole experiences sunshine continuously for 6 months a dark period too.
Question 9.
What happens to Sun rays on equator?
Answer:
| S.No. | Area | Happenings there |
| 1. | On Equator | There are 12 hrs of sunlight as well as there are 13 hrs of darkness there. Intensity of sunrays shows a little variation in varied months. |
| 2. | Southern States of India | Effect of season not prominent. |
| 3. | Southern Hemisphere and Northern Hemisphere | Local geographic characters is e.g. proximity to sea or ocean also affects these broader patterns seen in the hemispheres (North- South Hemisphere) |
Question 10.
How do you you see a solar eclipse safely?
Answer:
Sun remain intense hot during an eclipse. It may cause damage to our eyes. It can cause blindness too. Do not see eclipse directly. Avoid looking at Sun during an eclipse. Do not see this through a glass/sunglass, binocular or telescopes etc. Mostly certain astronomy organisations (e.g. planetaria, astronomy clubs hold eclipse seeing events during it.
Take part in such events to avoid damages to our eyes. At this time, these organisations provide us specialised eye protection. They also explain us scientific explanation too.
Question 11.
Explore an activity Rotation of Earth with a globe of Earth.
Answer:
Aim: To explore rotation of Earth with a globe
Material required: One globe of medium size and one sticker
Procedure :
(a) Take a globe of medium size.
(b) Put a tiny sticker on it.
(c) Then see from above North Pole.
(d) Now rotate globe slowly in anti-clockwise direction.
(e) Observe your position/location.
(f) Record observations also.
Observation :
(a) The globe represents Earth.
(b) Sun rises in east.
(c) Sun sets in west.
(d) One rotation includes day and night too in one day-night in 24 hours.
Inference: Earth moves one time only in one rotation of Earth in 24 hours.
Precautions: Do activity under supervision of your teacher.
Question 12.
Compare solar and lunar eclipses.
Answer:
| S.No. | Solar eclipse | Lunar eclipse |
| 1. | Earth blocks light coming from sun in it. | Earth block light of sun that reach moon. |
| 2. | Earth blocks sun rays reaching to us. It is total solar eclipse. | Moon remains fully in shadow of Earth. You notice total lunar eclipse. |
| 3. | Moon partially blocks Sun. | Part of moon lies in Earth’s shadow in partial lunar eclipse. |
Question 13.
Distinguish between Rotation and the Revolution of Earth.
Answer:
| S.No. | Rotation of Earth | Revolution of Earth |
| 1. | It can be shown by yourself on riding a moving around in a park. | It can be shown by Earth (a globe). |
| 2. | There is one rotation in 24 hours. | There is one revolution in a year or 365 days and 6 hours |
| 3. | Rotation refers to motion of an object where all parts of move in circles around an imaginery line. | Revolution is defined as motion of an object around an other object. |
Question 14.
How does the Earth’s rotation affect what we observe in the sky each day?
Answer:
The Earth rotates from west to east on its axis. As a result, we see the Sun rises in the east and sets in the west, even though the Sun is not actually moving. The same applies to the stars-they appear to shift across the sky because we are on a moving Earth. The Pole Star, however, seems fixed because it lies almost directly above Earth’s rotational axis. This apparent movement is a result of our rotating viewpoint.
Question 15.
What are equinoxes and how are they different from solstices? Give examples with months.
Answer:
Equinoxes are days when the duration of day and night are equal, occurring around 21 March and 23 September. Solstices, on the other hand, are the longest and shortest days of the year. The summer solstice (around 21 June) has the longest day in the Northern Hemisphere, while the winter solstice (around 22 December) has the shortest. These changes are caused by the tilt of the Earth’s axis during its yearly journey around the Sun.
Earth Moon and the Sun Class 7 Long Question Answer
Question 1.
What are various patterns of Earth while it revolves around Sun? Give figure also.
Answer:
Earth axis of rotation is not visible upright, but tilted, with reference to its object. It is true. It is maintained by Earth since its orbits around Sun. It is very clear shape of earth is spherical and tilt of axis of Earth is cause of seasons at all.
Question 2.
Explain the seasons on the Earth with figures.
Answer:
| S.No. | Time | Zone | Activity/Process |
| (a) | June | Northern Hemishpere | Northern hemisphere tilted towards Sun. |
| Southern Hemishpere | Southern hemisphere tilted away from Sun. | ||
| June | Southern Hemishpere | Some Rays of Sun spread in smaller zone in Northern Hemisphere incomparison to Southern Hemisphere as spherical shape of Earth surface. Zone heated more. | |
| (b) | June | Northern Hemishpere | Get sunlight for more than twelve hours. Northern hemisphere has more sunlight for longer time too. Causes Summer Season. |
| S.No. | Time | Zone | Activity/Process |
| (a) | December | Northern Hemishpere | Southern hemisphere tilted away from Sun. |
| Southern Hemishpere | Some Rays of Sun spread in smaller zone in Northern Hemisphere for comparison to Southern Hemisphere as spherical shape of Earth surface. Zone heated more. | ||
| June | Southern Hemishpere | Get sunlight for more than twelve hours. Northern hemisphere has more sunlight for longer time too. Causes Summer Season. | |
| (b) | June | Northern Hemishpere | Southern hemisphere tilted away from Sun. |
Note: The seasons and length of day are reversed in Southern Hemisphere in comparison to Northern Hemisphere. Hence, there is winter in June month. So, there is summer in December month.
Question 3.
(a) What is rotation of Earth?
Answer:
Earth rotates on its axis. It happens in about twenty hours. Earth moves from west to east direction to cause day and night. Apparent motion of Sun, Moon and stars is due to this too.
(b) Explain revolution of Earth in a few lines.
Answer:
Revolution of Earth around Sun occurs in about one year. One revolution take one year. It is a motion of an object to the other. Earth revolves around Sun. One revolution rakes 365 days and six hours.
(c) What is changing view of bright sky from Earth?
Answer:
Sun sets in west, night is visible then. It occurs due to rotation of Earth. Earth revolves around Sun at a continuous speed, stars visible in sky at night after sunsets slowly change over one year when we view various directions.
Question 4.
Describe the motion of the Earth using a labelled diagram showing rotation and revolution.
Answer:
The Earth spins on its axis once every 24 hours. This is called rotation and it causes day and night. At the same time, the Earth travels around the Sun in an orbit, completing one revolution in about 365 days. The combination of rotation and revolution, along with the tilt of the Earth’s axis, explains the cycles of day, night, and seasons.
Question 5.
Draw and label a diagram showing the positions of the Sun, Earth, and Moon during a lunar eclipse.
Answer:
Question 6.
Draw and label a diagram showing the positions of the Sun, Earth, and Moon during a solar eclipse.
Answer:
Earth Moon and the Sun Class 7 Case Based Questions
1. Read the following passage carefully and answer the questions that follow :
The rotation of earth from west to east is cause of day-night cycle. Side that face sun is day but other side facing sun is dark too that is cause of night yet. Sun appears to rise in east since earth moves across sky east direction to west direction. Sun also sets in west. The night starts then. Stars twinkle in the night sky.
(i) State cause of night and day cycle.
(a) rotation of Sun
(b) rotation of earth
(c) rotation of moon
(d) rotation of stars
Answer:
(b) rotation of earth
(ii) In which direction does the sun rises:
(a) East
(b) West
(c) North
(d) South
Answer:
(a) East
(iii) In which direction does the sun sets:
(a) West Direction
(b) East Direction
(c) South Direction
(d) North Direction
Answer:
(a) West Direction
2. Read the following passage carefully and answer the questions that follow :
One morning in Kanniyakumari, Rashmika noticed that shadows of coconut trees were long in the morning and shorter in the afternoon. She recalled her science teacher explaining that the Earth rotates on its axis from west to east. She wondered if it was the Sun or the Earth that moved across the sky.
(i) What causes the Sun to appear to move across the sky during the day?
(a) Revolution of the Earth around the Sun
(b) Rotation of the Sun
(c) Rotation of the Earth on its axis
(d) Revolution of the Moon around the Earth
Answer:
(c) Rotation of the Earth on its axis
(ii) If the Earth did not rotate on its axis, what would be the result?
(a) Constant day everywhere
(b) Seasons would not occur
(c) One side of Earth would always have night
(d) Both (a) and (c)
Answer:
(d) Both (a) and (c)
(iii) In which direction does the Sun rise and set?
(a) Rises in the West and sets in the East
(b) Rises in the East and sets in the West
(c) Rises in the North and sets in the South
(d) It remains stationary
Answer:
(b) Rises in the East and sets in the West
(iv) Which instrument was used in the classroom to explain Earth’s rotation?
(a) Globe
(b) Telescope
(c) Compass
(d) Periscope
Answer:
(a) Globe
Earth Moon and the Sun Class 7 Picture Based Questions
1. Look at the figure and answer the following questions:
(i) Identify the picture:
(a) geometry of lunar eclipse
(b) geometry of solar eclipse
(a) and (b)
(c) both
(d) all of these
Answer:
(a) geometry of lunar eclipse
(ii) When did partial lunar eclipse happen?
(a) part of moon in Earth’s shadow
(b) part of moon in Sun’s shadow
(c) both (a) and (b) (d) none of these
Answer:
(a) part of moon in Earth’s shadow
(iii) When is total lunar eclipse happened?
(a) part of moon in Earth’s shadow
(b) part of moon in Sun’s shadow
(c) moon is completely in Earth’s shadow
(d) Sun is completely in Earth’s shadow
Answer:
(c) moon is completely in Earth’s shadow
Earth Moon and the Sun Extra Questions for Practice
Multiple Choice Questions (MCQs) :
Question 1.
Pole star is constellation of:
(a) Ursha major
(b) Ursa major
(c) Scorpions
(d) Orion
Question 2.
Motion of an object in ehich all parts move is:
(a) rotation
(b) revolution
(c) both (a) and (b)
(d) none of these
Question 3.
At night, we can see:
(a) Sun
(b) Moon
(c) both (a) and (b)
(d) none of these
Question 4.
The Pole star seems to be in:
(a) Northern Hemisphere
(b) Western Hemisphere
(c) Southern Hemisphere
(c) Eastern Hemisphere
Very Short Answer Type Questions :
Question 1.
Define an orbit and solar eclipse.
Question 2.
How are day and night caused?
Question 3.
Give reason why seasons occur in a year?
Question 4.
What do you know about “Big Dipper”?
Short Answer Type Questions:
Question 1.
Give a difference between day and night.
Question 2.
State one difference between lunar and solar eclipses.
Question 3.
What are North and South Poles?
Question 4.
How is summer caused?
Question 5.
What role does Venus and Mercury play?
Question 6.
Why seasons occur on Earth? State any two incorrect reasons of it.
Question 7.
Who was Aryabhatta? Mention his any five contributions in astronomy.
Question 8.
Describe role of Sun, Moon, Earth in eclipses.
Question 9.
Give sketches of: (a) A spining ball, (b) a spinning top, (c) a spinning fan
Long Answer Type Questions :
Question 1.
A girl sees some objects while sitting on a merry-go-round in a park. She observes subjects around her. What does she observe? Explain briefly.
Question 2.
Rahul and Sita use a globe to understand rotation of Earth. Explain it by an activity.
Question 3.
Explain: (i) Sunset (ii) Sunrise (iii) Day and night
Question 4.
What are seasons? How are they caused?