Maharashtra Board Class 6 Science Chapter 16 The Universe Solutions

1. Name These.

Question a. Birthplace of stars.
Answer: Nebulae
In simple words: Nebulae are vast clouds of gas and dust in space where new stars are born.

🎯 Exam Tip: Knowing the definition of nebulae is key for understanding star formation.

Question b. The biggest planet in the Solar System.
Answer: Jupiter
In simple words: Jupiter is the largest planet in our solar system, known for its massive size and numerous moons.

🎯 Exam Tip: Remember the order and key characteristics of planets, especially the largest one.

Question c. The galaxy which is our neighbour.
Answer: Andromeda
In simple words: The Andromeda galaxy is the closest large galaxy to our Milky Way galaxy.

🎯 Exam Tip: Identifying neighboring galaxies helps place our solar system in a larger cosmic context.

Question d. The brightest planet in the solar system.
Answer: Venus
In simple words: Venus is the brightest planet because of its dense, reflective cloud cover that reflects a lot of sunlight.

🎯 Exam Tip: Understand why Venus is so bright – its atmosphere plays a crucial role.

Question e. Planet with the largest number of satellites.
Answer: Jupiter
In simple words: Jupiter has a vast number of natural satellites or moons orbiting it, more than any other planet in our solar system.

🎯 Exam Tip: Knowing the planets with the most moons can be an important factual recall point.

Question f. Planet without a single satellite.
Answer: Venus and Mercury
In simple words: Mercury and Venus are the only two planets in our solar system that do not have any natural moons orbiting them.

🎯 Exam Tip: It's useful to remember which planets lack moons, as this is a unique characteristic.

Question g. Planet with a rotation different from other planets.
Answer: Venus
In simple words: Venus rotates in the opposite direction to most other planets and also rotates very slowly.

🎯 Exam Tip: Note the unusual rotation of Venus; it's a key distinguishing feature.

Question h. A celestial body that carries a tail along.
Answer: Comet
In simple words: Comets are icy celestial bodies that, when near the sun, display a visible tail of gas and dust.

🎯 Exam Tip: Understanding the composition and behavior of comets is important for solar system knowledge.

2. Fill In The Blanks.

Question a. The group of galaxies of which our Milky Way is a part is called .............. .
Answer: Local group
In simple words: Our Milky Way galaxy belongs to a cluster of galaxies known as the Local Group.

🎯 Exam Tip: Knowing the name of our galaxy's cluster helps in understanding the large-scale structure of the universe.

Question b. Comets are made of .............. .
Answer: ice and dust particles
In simple words: Comets are primarily composed of frozen gases, ice, and dust particles, often called "dirty snowballs".

🎯 Exam Tip: Recall the key materials that make up comets, as this explains their characteristic tail.

Question c. The planet .............. appears as if it is rolling along its orbit.
Answer: Uranus
In simple words: Uranus has a unique tilt to its axis, causing it to appear to roll on its side as it orbits the sun.

🎯 Exam Tip: The axial tilt of Uranus is a distinctive feature worth remembering.

Question d. .............. is a stormy planet.
Answer: Jupiter
In simple words: Jupiter is known for its intense and continuous storms, most notably the Great Red Spot.

🎯 Exam Tip: Associate Jupiter with its characteristic stormy weather and powerful atmospheric phenomena.

Question e. The pole star is the best example of a .............. type of star.
Answer: variable
In simple words: The Pole Star, or Polaris, is an example of a variable star, meaning its brightness changes over time.

🎯 Exam Tip: Understanding different types of stars, like variable stars, adds depth to astronomy knowledge.

3. Say If The Statements Given Below Are Right Or Wrong. Rewrite The Statements After Correcting Them.

Question a. Venus is the planet closest to the sun.
Answer: Wrong: Mercury is the planet closest to the sun.
In simple words: The planet closest to the sun is Mercury, not Venus.

🎯 Exam Tip: Memorize the correct order of planets from the sun to avoid common errors.

Question b. Mercury is called a stormy planet.
Answer: Wrong: Jupiter is called a stormy planet.
In simple words: Jupiter is known as the stormy planet due to its massive storms, unlike Mercury which has almost no atmosphere.

🎯 Exam Tip: Correctly identifying planets by their unique characteristics, like storminess, is crucial.

Question c. Jupiter is the biggest planet.
Answer: Right
In simple words: This statement is correct; Jupiter is indeed the largest planet in our solar system.

🎯 Exam Tip: Knowing the relative sizes of planets is a fundamental fact in astronomy.

4. Answer The Following.

Question a. What is a special characteristic of the planet Mars?
Answer: The highest and the longest mountain in the solar system 'Olympus Mons' is located on Mars.
In simple words: Mars is famous for hosting Olympus Mons, the largest volcano and highest mountain in the entire solar system.

🎯 Exam Tip: Highlighting unique features like Olympus Mons demonstrates a deeper understanding of each planet.

Question b. What are the type of galaxies?
Answer: The different types of galaxies identified according to their shapes are spiral, elliptical, barred spiral, irregular.
In simple words: Galaxies are classified into several main types based on their visible shape, including spiral, elliptical, barred spiral, and irregular forms.

🎯 Exam Tip: Listing the main classifications of galaxies by shape is a good way to show knowledge of cosmic structures.

Question c. Which celestial bodies does a galaxy include?
Answer: Galaxy includes stars, their planetary system, cluster of stars, nebulae, clouds of gases, clouds of dust, dead stars, newly born stars etc.
In simple words: A galaxy is a vast collection of celestial bodies, comprising stars, planets, nebulae, gas and dust clouds, and remnants of stars like dead or newly forming stars.

🎯 Exam Tip: Remember that galaxies are complex systems containing various types of celestial objects, not just stars.

Question d. Name the different types of stars.
Answer: The different types of stars are
1. Sun-like stars e.g. stars like Sirius, Alpha Centauri
2. Red Giants Stars
3. Super Nova
4. Binary or Twin Stars
5. Variable Stars e.g. Polaris (pole star)
In simple words: Stars come in various types, such as sun-like stars, large red giants, extremely bright supernovae, pairs of binary stars, and stars whose brightness changes, known as variable stars.

🎯 Exam Tip: Being able to list different star types and provide examples showcases a broad understanding of stellar astronomy.

Question e. What are the types of comets and on what basis are they classified?
Answer:
1. Comets are of two types: Long-period comets and short-period comets.
2. Classification of comets is based on the time (period) taken by the comets to complete one revolution around the sun.
In simple words: Comets are divided into long-period and short-period types, classified by how long they take to orbit the sun.

🎯 Exam Tip: Understanding the classification of comets based on their orbital period is essential for comprehending their behavior.

Question f. What is the difference between meteors and meteorites?
Answer:
1. Meteors are rocky pieces originating from the asteroid belt. Smaller rocky pieces get completely burnt due to friction with air after they enter the earth's atmosphere.
2. Meteors which do not burn completely and fall to the surface of the earth are called meteorites.
In simple words: Meteors are small rocky fragments that burn up in Earth's atmosphere, while meteorites are those pieces that survive the atmospheric entry and hit the ground.

🎯 Exam Tip: Clearly distinguishing between meteors (shooting stars) and meteorites (fallen rocks) is a common point of confusion to master.

Question g. What are the characteristics of the planet Neptune?
Answer: Neptune is the eighth planet in the solar system. A season on Neptune lasts for about 41 years. On this planet winds blow with extremely high speed.
In simple words: Neptune is the eighth planet from the sun, known for its extremely long seasons lasting around 41 Earth years and its incredibly fast winds.

🎯 Exam Tip: Focus on Neptune's unique features like its extreme wind speeds and long seasons.

5. Match The Following.

Question a.Group 'A'
1. Galaxy
2. Comet
3. Sun-like star
4. Saturn
5. Venus
Group 'B'
(a) From east to west
(b) 33 satellites
(c) Spiral
(d) Sirius
(e) Halley
Answer:

🎯 Exam Tip: For matching questions, understand the core characteristics of each item in both columns to make accurate pairs.

Activity:

Question 1. Using the material you can find in your house, prepare a model of the solar system.
Answer: Students should gather materials like cardboard, paints, styrofoam balls, string, and glue to create a scaled model representing the sun and planets in our solar system, ensuring relative sizes and distances are considered for accuracy.
In simple words: Use everyday household items to build a creative and informative model of the solar system.

🎯 Exam Tip: Practical activities like model-making help solidify understanding of planetary arrangement and scale.

Question 2. Collect information about different aspects of each planet such as its distance from the sun, its diameter, its volume, etc. and present it in a science exhibition.
Answer: Students should research each planet's specific data points like orbital distance, diameter, volume, atmospheric composition, and number of moons. This information can then be presented using charts, posters, or digital displays at a science exhibition, highlighting unique features of each.
In simple words: Research and compile key facts about each planet, then present this information clearly in a science exhibition.

🎯 Exam Tip: Thorough research and clear presentation skills are vital for educational projects and exhibitions.

Class 6 Science Chapter 16 The Universe Important Questions And Answers

Fill In The Blanks.

Question 1. The Milky Way is known as .............. .
Answer: Mandakini
In simple words: The Milky Way galaxy is also commonly referred to by its Hindi name, Mandakini.

🎯 Exam Tip: Knowing alternative names for celestial objects can be helpful for general knowledge and specific contexts.

Question 2. The .............. is a galaxy in which our solar system is located.
Answer: Milky Way
In simple words: Our solar system, including Earth, resides within the spiral arms of the Milky Way galaxy.

🎯 Exam Tip: Identify our home galaxy correctly to understand our cosmic address.

Question 3. The galaxy that is closest to our Milky Way is .............. .
Answer: Andromeda
In simple words: The Andromeda galaxy is our closest major galactic neighbor and is on a collision course with the Milky Way.

🎯 Exam Tip: Remember the Andromeda galaxy as the nearest large galaxy to ours.

Question 4. The universe includes innumerable galaxies, the space between them and also .............. .
Answer: energy
In simple words: The universe encompasses countless galaxies, the vast empty space between them, and all forms of energy.

🎯 Exam Tip: Recognize that the universe is made up of galaxies, the space between them, and various forms of matter and energy.

Question 5. The Milky Way is a part of the .............. of galaxies.
Answer: Local group
In simple words: Our Milky Way galaxy is one of the many galaxies forming a cluster called the Local Group.

🎯 Exam Tip: Understand that galaxies often exist in groups or clusters, and the Milky Way is part of the Local Group.

Question 6. Generally, the surface temperature of stars ranges from 3500° C to .............. .
Answer: 50000°C
In simple words: The surface temperatures of stars vary widely, typically falling within the range of 3500°C to 50000°C.

🎯 Exam Tip: Remember the general temperature range for stellar surfaces, indicating the intensity of fusion processes.

Question 7. The colour of stars changes according to their ...............
Answer: temperature
In simple words: A star's color is directly related to its surface temperature; hotter stars appear blue or white, while cooler stars appear red.

🎯 Exam Tip: Connect stellar color directly to temperature; this is a fundamental concept in stellar classification.

Question 8. Red giants stars are .............. in colour.
Answer: red
In simple words: Red giant stars are characterized by their large size and relatively cool surface temperatures, which give them a red appearance.

🎯 Exam Tip: Understand the color and size characteristics of red giant stars as a stage in stellar evolution.

Question 9. Super Nova stars are .............. and .............. than the red giant stars.
Answer: brighter, larger
In simple words: Supernova stars are incredibly bright and much larger than red giant stars, resulting from the explosive death of massive stars.

🎯 Exam Tip: Differentiate supernovae as extremely energetic and luminous events, far surpassing red giants in brightness and apparent size.

Question 10. More than .......... of the stars in the sky are .......... stars.
Answer: half, binary
In simple words: More than half of the stars observed in the night sky are actually part of binary or multiple star systems, rather than solitary stars.

🎯 Exam Tip: It's important to know that many stars exist in binary or multiple systems, not just as single stars.

Question 11. The .............. and .............. of variable stars is not stable.
Answer: luminance, shape
In simple words: Variable stars are celestial objects whose brightness (luminance) and sometimes even their physical shape fluctuate over time.

🎯 Exam Tip: Understand that variable stars show changes in their light output and possibly their form.

Question 12. When a star contracts, its surface temperature .............. and the star emits .............. energy and appears .............. .
Answer: increases, greater, brighter
In simple words: As a star contracts, its core becomes denser and hotter, leading to an increase in surface temperature, emission of more energy, and a brighter appearance.

🎯 Exam Tip: Relate stellar contraction to increased temperature, energy output, and brightness, which are key aspects of stellar evolution.

Question 13. The sun which is at the centre of the solar system is a .............. coloured star.
Answer: yellow
In simple words: Our sun is classified as a yellow dwarf star, with a surface temperature that gives it a yellowish hue.

🎯 Exam Tip: Remember the sun's classification and color; it's a typical main-sequence star.

Question 14. The diameter of the sun is approximately .............. km.
Answer: 13, 92, 000
In simple words: The sun has an approximate diameter of 1,392,000 kilometers, making it immense compared to Earth.

🎯 Exam Tip: Knowing the sun's approximate diameter helps in appreciating its immense size in the solar system.

Question 15. .............. is the fastest moving planet.
Answer: Mercury
In simple words: Mercury is the fastest planet in our solar system, completing its orbit around the sun in just 88 Earth days.

🎯 Exam Tip: Remember that Mercury's proximity to the sun leads to its rapid orbital speed.

Question 16. .............. is the brightest planet in the solar system.
Answer: Venus
In simple words: Venus shines brightest in our sky due to its highly reflective cloud cover.

🎯 Exam Tip: Venus's brightness is a key characteristic, often making it visible in the morning or evening sky.

Question 17. .............. is the hottest planet.
Answer: Venus
In simple words: Despite being farther from the sun than Mercury, Venus is the hottest planet due to its thick greenhouse atmosphere.

🎯 Exam Tip: Understand that Venus's intense greenhouse effect, not just proximity to the sun, makes it the hottest planet.

Question 18. As the earth is a .............. there is a magnetic field around the earth.
Answer: magnet
In simple words: Earth acts like a giant magnet due to its molten iron core, generating a magnetic field that extends into space.

🎯 Exam Tip: Recognize Earth's magnetic field as a result of its internal structure, crucial for protecting the planet.

Question 19. Mars is also called the .............. .
Answer: Red planet
In simple words: Mars is known as the Red Planet because of the iron oxide (rust) on its surface, which gives it a reddish hue.

🎯 Exam Tip: Connect Mars's reddish color to the presence of iron oxide on its surface.

Question 20. As the soil on Mars contains .............. its colour is reddish.
Answer: iron
In simple words: The reddish color of Martian soil is due to a high concentration of iron, which rusts when exposed to oxygen.

🎯 Exam Tip: Understanding the composition of Martian soil helps explain its distinctive color.

Question 21. .............. planets of the size of the earth can get accommodated on Jupiter.
Answer: 1397
In simple words: Jupiter is so massive that nearly 1397 Earth-sized planets could fit inside it.

🎯 Exam Tip: Appreciate the immense size of Jupiter by comparing it to Earth's volume.

Question 22. Jupiter is called as .............. .
Answer: The stormy planet
In simple words: Jupiter is often referred to as the stormy planet due to its vast, enduring atmospheric storms, such as the Great Red Spot.

🎯 Exam Tip: Remember Jupiter's characteristic storms as a key feature, giving it the nickname "stormy planet."

Question 23. Saturn mass is .............. times that of the earth.
Answer: 95
In simple words: Saturn has a mass approximately 95 times greater than that of Earth, making it a giant among planets.

🎯 Exam Tip: Quantifying Saturn's mass relative to Earth helps in understanding its significant size.

Question 24. .............. cannot be seen without a telescope.
Answer: Uranus
In simple words: Uranus is too far and dim to be seen with the naked eye and requires a telescope for observation.

🎯 Exam Tip: Identify Uranus as one of the planets that requires optical aid for viewing due to its distance and brightness.

Question 25. Winds blow with extremely high speed on .............. .
Answer: Neptune
In simple words: Neptune is famous for having the fastest winds in the solar system, reaching speeds of over 2,000 km/h.

🎯 Exam Tip: Associate Neptune with its characteristic extremely high-speed winds.

Question 26. .............. is the satellite of the earth.
Answer: The moon
In simple words: The Moon is Earth's only natural satellite, orbiting our planet and influencing tides.

🎯 Exam Tip: The Moon is Earth's primary satellite, a fundamental fact in astronomy.

Question 27. The moon's period of .............. and .............. are both of 27.3 days.
Answer: rotation, revolution
In simple words: The Moon takes approximately 27.3 days to complete one rotation on its axis and also one revolution around the Earth, which is why we always see the same side.

🎯 Exam Tip: Understanding that the Moon's rotation and revolution periods are synchronized explains why we only see one side.

Question 28. .............. is classified as a dwarf planet.
Answer: Pluto
In simple words: Pluto was reclassified as a dwarf planet because it has not cleared its orbit of other debris.

🎯 Exam Tip: Remember Pluto's reclassification as a dwarf planet and the reasons behind it.

Question 29. Pluto takes .............. years to complete its revolution around the sun.
Answer: 248
In simple words: Pluto has a very long orbital period, taking approximately 248 Earth years to make one full trip around the sun.

🎯 Exam Tip: Note the exceptionally long orbital period of Pluto, indicating its great distance from the sun.

Question 30. .............. are formed out of ice and dust particles.
Answer: Comets
In simple words: Comets are icy bodies composed primarily of frozen gases and dust, giving them a distinct appearance when near the sun.

🎯 Exam Tip: Recall the composition of comets (ice and dust) as a key identifying feature.

Question 31. .............. lake in Maharashtra has been formed by the impact of such a meteorite.
Answer: Lonar
In simple words: Lonar Lake in Maharashtra is a unique natural crater lake believed to have been formed by a meteorite impact.

🎯 Exam Tip: Lonar Lake is a notable example of a meteorite impact crater in India, relevant for understanding celestial impacts.

Can You Tell?

Question 1. Which celestial bodies form the solar system?
Answer: Sun, the eight planets - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, their satellites, Dwarf planets, asteroids, meteors and comets all together form our solar system.
In simple words: The solar system consists of the Sun, eight planets, their moons, dwarf planets, asteroids, meteors, and comets, all gravitationally bound.

🎯 Exam Tip: Be able to list all major components of our solar system to demonstrate comprehensive knowledge.

Question 2. What is the difference between stars and planets?
Answer:

🎯 Exam Tip: Clearly differentiate between stars and planets based on their light emission, size, and motion. The table format is excellent for clarity.

Question 3. How many planets are there in our solar system?
Answer: There are 8 planets in our solar system.
In simple words: Our solar system contains eight major planets orbiting the sun.

🎯 Exam Tip: Know the current count of planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune).

Question 4. What is to be found between Mars and Jupiter?
Answer: A belt of celestial bodies called as asteriods is found between the planets Mars and Jupiter.
In simple words: Between the orbits of Mars and Jupiter lies the asteroid belt, a region filled with numerous small rocky bodies.

🎯 Exam Tip: The location of the asteroid belt is a key geographical feature of the solar system.

Question 5. Have you ever seen in the evening or in the pre-dawn hours a large celestial body with a long tail? What is it called?
Answer: Yes, it is a comet-a large celestial body with a long tail. I have not seen it, but heard that in 1986 there was a Halley's comet seen in the Indian sky.
In simple words: The celestial body with a long tail seen in the sky is a comet, such as Halley's Comet which was last visible in 1986.

🎯 Exam Tip: Comets are distinct celestial objects; knowing examples like Halley's Comet adds to your understanding.

Use Your Brain Power!

Question 1. Why do we see only one side of the moon?
Answer: As the moon revolves around the earth it also rotates around itself. The moon takes 27.3 days to complete one revolution around the earth. It takes the moon the same time to complete one rotation around itself. Therefore, only one side of moon is visible.
In simple words: We only see one side of the Moon because its rotation period on its axis is exactly the same as its revolution period around Earth.

🎯 Exam Tip: This phenomenon, called tidal locking, is a crucial concept explaining the Moon's observed behavior.

Question 2. Which planet has a day longer than its year?
Answer: A planet's day is how long it takes to complete one rotation on its own axis. Venus takes 243 earth days to complete one rotation because of its slow rotation around its axis. A year is the time taken by the planet to complete one revolution around the sun. Venus completes one revolution around the sun in 225 days. This makes a day longer than a year on Venus.
In simple words: Venus has a day longer than its year because it rotates very slowly on its axis (243 Earth days) but orbits the sun more quickly (225 Earth days).

🎯 Exam Tip: Venus's extremely slow and retrograde rotation makes its solar day longer than its orbital period, a unique characteristic.

Answer In One Sentence.

Question 1. What is the Milky Way?
Answer: Milky way is the galaxy in which our solar system is located.
In simple words: The Milky Way is the spiral galaxy that contains our solar system.

🎯 Exam Tip: Define the Milky Way accurately as our home galaxy.

Question 2. What is a galaxy?
Answer: A group of innumerable stars and their planetary systems are together known as galaxy.
In simple words: A galaxy is a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, all bound together by gravity.

🎯 Exam Tip: Provide a concise definition of a galaxy, highlighting its primary components.

Question 3. What does the Universe include?
Answer: The universe includes innumerable galaxies, the space between them and also energy.
In simple words: The Universe encompasses all existing matter, energy, space, and time, including countless galaxies and the vast stretches between them.

🎯 Exam Tip: A comprehensive definition of the Universe should include all matter, energy, and space-time.

Question 4. What different colours do the stars radiate?
Answer: The stars radiate different colours such as blue, white, yellow and red.
In simple words: Stars emit light in various colors, including blue, white, yellow, and red, which indicate their surface temperatures.

🎯 Exam Tip: List the common colors of stars and remember that color is linked to temperature.

Question 5. Where are stars born?
Answer: The birth place of stars are the huge nebulae, made of dust particles and gases.
In simple words: Stars are born within massive clouds of gas and dust called nebulae.

🎯 Exam Tip: Identify nebulae as the stellar nurseries where new stars form.

Question 6. What is the surface temperature of the sun?
Answer: The surface temperature of the Sim is around 6,000°C.
In simple words: The sun's surface is extremely hot, reaching about 6,000 degrees Celsius. This high temperature is due to nuclear fusion reactions occurring at its core.

🎯 Exam Tip: Remember the approximate temperature of the Sun's surface as a key fact about stars.

Question 7. What is the size of the sun?
Answer: The size of the sun is so huge that around 13 lakh planets of the size of the earth can be easily placed within it.
In simple words: The sun is incredibly large, capable of holding about 1.3 million Earths inside it, highlighting its massive scale compared to our planet.

🎯 Exam Tip: Quantifying the Sun's size relative to Earth helps illustrate its dominance in our solar system.

Question 8. How does the sun balance the other celestial bodies?
Answer: Due to the gravitational force of the sun, the celestial bodies in the solar system revolve around it.
In simple words: The sun's strong gravitational pull keeps all the planets and other objects in the solar system orbiting around it, maintaining their balance and paths.

🎯 Exam Tip: Gravity is the fundamental force responsible for planetary orbits and the structure of the solar system.

Question 9. How does the sun move in the Milky Way?
Answer: The sun rotates around its axis and while doing so, it revolves around the centre of the Milky Way taking the solar system along with it.
In simple words: The sun spins on its own axis while also circling the center of our Milky Way galaxy, carrying all its planets with it.

🎯 Exam Tip: Understand that the Sun's movement is dual: rotation (on its axis) and revolution (around the galactic center).

Question 10. Which planet doesn't have atmosphere?
Answer: Mercury doesn't have atmosphere.
In simple words: Mercury lacks a significant atmosphere, making its surface exposed to extreme temperatures and solar radiation.

🎯 Exam Tip: Mercury's lack of atmosphere is a key characteristic that differentiates it from other planets.

Question 11. How much time does the earth take to complete one rotation and one revolution?
Answer: The earth completes one rotation in 24 hrs and one revolution in 365 days i.e. 1 year.
In simple words: Earth spins on its axis once every 24 hours (a day) and travels around the sun once every 365 days (a year).

🎯 Exam Tip: Distinguish between rotation (day/night) and revolution (seasons/year) and their respective durations.

Question 12. Which planets have rings around them?
Answer: Jupiter, Saturn, Uranus, Neptune have rings around them.
In simple words: The gas giants - Jupiter, Saturn, Uranus, and Neptune - are all known for having systems of rings orbiting them.

🎯 Exam Tip: Remember the four outer planets are characterized by their ring systems.

Question 13. Which planet do not have rings around them?
Answer: Mercury, Venus, Earth and Mars do not have rings around them.
In simple words: The inner, rocky planets - Mercury, Venus, Earth, and Mars - do not possess any ring structures.

🎯 Exam Tip: Knowing which planets lack rings is as important as knowing which ones have them, helping categorize planets.

Question 14. State two properties of planet Mercury.
Answer: Mercury is the closet planet to the Sim. Mercury is the fastest moving planet.
In simple words: Mercury is the closest planet to the sun and also the fastest in its orbit.

🎯 Exam Tip: Mercury's proximity to the sun and high orbital speed are its defining features.

Question 15. When is the Mercury visible to us?
Answer: Mercury is visible in the morning and in the evening if it is away from the sun.
In simple words: Mercury can be seen shortly after sunset or before sunrise when it's positioned far enough from the sun in the sky.

🎯 Exam Tip: Mercury's visibility is limited to twilight hours due to its close orbit to the Sun.

Question 16. What is seen on the surface of the mercury?
Answer: A number of depressions which are actually caused by meteoric falls are seen on the surface of mercury.
In simple words: Mercury's surface is covered with many craters, formed by impacts from meteors due to its lack of a protective atmosphere.

🎯 Exam Tip: The heavily cratered surface of Mercury is direct evidence of frequent meteoroid impacts.

Question 17. When is Venus seen in the sky?
Answer: Venus is seen in the sky in the east before the sunrise and in the west after the sunset. It rotates around itself from east to west.
In simple words: Venus is often visible as the "morning star" in the east before dawn and the "evening star" in the west after dusk, due to its brightness and position relative to the sun. It also has a unique east to west rotation.

🎯 Exam Tip: Venus is notable for its appearance as the brightest object in the twilight sky and its retrograde rotation.

Question 18. How does earth protect us from harmful rays of Sun?
Answer: As the earth is a magnet there is a magnetic field around the earth. It diverts the harmful rays from the sun towards the polar regions of the earth.
In simple words: Earth's magnetic field acts like a shield, deflecting harmful solar radiation and particles towards the poles, protecting life on the planet.

🎯 Exam Tip: The Earth's magnetic field (magnetosphere) is crucial for protecting life from solar radiation.

Question 19. What is Olympus Mons?
Answer: Olympus Mons is the highest and longest mountain in the solar system located on Mars.
In simple words: Olympus Mons is a massive shield volcano on Mars, recognized as the largest mountain in the entire solar system.

🎯 Exam Tip: Identifying Olympus Mons as the largest mountain in the solar system and its location on Mars is important.

Question 20. Which is the largest planet of the solar system?
Answer: The Jupiter is the largest planet of the solar system.
In simple words: Jupiter, a gas giant, holds the title for the largest planet in our solar system.

🎯 Exam Tip: Jupiter's large size is a primary characteristic to remember when studying planets.

Question 21. Why is Saturn considered a peculiar planet?
Answer: Saturn considered a peculiar planet because of the rings around it.
In simple words: Saturn is unique among planets due to its prominent and beautiful system of rings.

🎯 Exam Tip: Saturn's rings are its most distinctive feature, making it a "peculiar" or unique planet.

Question 22. How is the axis of Uranus?
Answer: Uranus axis is so greatly inclined that it appears as if it is rolling along on its axis.
In simple words: Uranus has a highly tilted axis, causing it to appear to roll sideways as it orbits the sun.

🎯 Exam Tip: The extreme axial tilt of Uranus is a unique characteristic that students should remember.

Question 23. How are seasons on Neptune?
Answer: The seasons on Neptune last for about 41 years.
In simple words: Due to Neptune's long orbital period, each season on the planet stretches for approximately 41 Earth years.

🎯 Exam Tip: Neptune's very long orbital period directly translates to extremely long seasonal durations.

Question 24. What is a satellite?
Answer: The celestial bodies that revolve around a planet, without independently revolving around the sun are called Satellite.
In simple words: A satellite is a celestial body that orbits a planet, rather than directly orbiting the sun on its own.

🎯 Exam Tip: Understand that satellites orbit planets, distinguishing them from planets which orbit the sun.

Question 25. What is an Asteroid?
Answer: A great number of small sized bodies could not turn into planets when the solar system was formed, but continued to revolve around the sun. This bodies are known as asteroids.
In simple words: Asteroids are small, rocky objects that orbit the sun, mostly found in the asteroid belt between Mars and Jupiter. They are leftover material from the early solar system.

🎯 Exam Tip: Asteroids are remnants of the early solar system, primarily located in a belt between Mars and Jupiter.

Question 26. What is a Dwarf Planet?
Answer: A small sized celestial body that revolves independently around the sun is called the dwarf planet.
In simple words: A dwarf planet is a celestial body that orbits the sun and is massive enough to be nearly round, but hasn't cleared its orbital path of other debris.

🎯 Exam Tip: The key difference for dwarf planets is their inability to "clear the neighborhood" around their orbit.

Question 27. What is a comet?
Answer: A comet is a celestial body that revolves around sun. Comets are formed out of ice and dust particles.
In simple words: Comets are icy, dusty celestial bodies that orbit the sun and often develop a bright tail when they get close to it.

🎯 Exam Tip: Remember comets are primarily composed of ice and dust and develop a tail when heated by the sun.

Question 28. What are meteors?
Answer: Meteors are rocky pieces originating from the asteroids belt.
In simple words: Meteors are small rocky or metallic particles that burn up when they enter Earth's atmosphere, creating a streak of light often called a "shooting star."

🎯 Exam Tip: Meteors are typically small space rocks that become visible as they burn upon entering Earth's atmosphere.

Question 29. What are meteorites?
Answer: Meteors which do not bum completely and fall to the surface of the earth are called meteorites.
In simple words: Meteorites are meteors that survive their fiery descent through Earth's atmosphere and land on the planet's surface.

🎯 Exam Tip: A meteorite is simply a meteor that has made it to the ground.

Give Reasons For The Following

Question 1. Comets came to be called 'dirty snowballs'.
Answer: Comets consist of an icy cluster of various constituents like dust particles. Hence it is called dirty snowballs.
In simple words: Comets are often called 'dirty snowballs' because they are essentially frozen balls of ice, rock, and dust, making them look like grimy clumps of snow.

🎯 Exam Tip: The composition of ice and dust is key to understanding why comets are referred to as 'dirty snowballs'.

Question 2. Comets are visible when they are close.
Answer: Comets are formed out of ice and dust particles. They appear like points when they are far away from the sun, but when they are close to the sun they become easily visible to us because of the shorter distance and the heat of the sun.
In simple words: Comets become visible when they near the sun because solar heat causes their ice to vaporize, releasing dust and gas that reflect sunlight, making them glow.

🎯 Exam Tip: Solar heating and the resulting sublimation of ice are the primary reasons comets become visible from Earth.

Question 3. Comets appear to have a long feathery tail.
Answer: Comets are made up of frozen matter and dust particles. When they are close to the sun this frozen matter gets converted into gas due to the solar heat. These gases get thrown in a direction away from the sun. As a result comets appear to have a long feathery tail.
In simple words: When a comet approaches the sun, its ice turns into gas and dust, which is then pushed away by solar wind and radiation, forming a long, bright tail.

🎯 Exam Tip: The formation of a comet's tail is a direct result of solar heat and solar wind interacting with its icy composition.

Question 4. Pluto is called as a dwarf planet.
Answer: Pluto is a small sized celestial body that revolves independently around the sun.
In simple words: Pluto is classified as a dwarf planet because, while it orbits the sun and is nearly round, it has not cleared its orbital path of other debris, unlike a full-fledged planet.

🎯 Exam Tip: The main reason Pluto is a dwarf planet is its failure to clear its orbital neighborhood.

Question 5. Moon is a satellite of the earth.
Answer: Moon revolves around the earth without independently revolving around the sun. Hence moon is a satellite of the earth.
In simple words: The Moon is Earth's natural satellite because it orbits Earth and does not independently orbit the sun.

🎯 Exam Tip: The definition of a satellite hinges on its orbit around a planet, not directly the sun.

Question 6. Mars is called the Red Planet.
Answer: As the soil on the Mars contains iron its colour is reddish. Hence Mars is also called the RedPlanet.
In simple words: Mars gets its nickname "Red Planet" from the iron oxide (rust) present in its soil, which gives it a distinctive reddish hue.

🎯 Exam Tip: The presence of iron oxide (rust) on its surface is the reason for Mars's red color.

Question 7. Jupiter is called the Stormy Planet.
Answer: Jupiter revolves around itself with a great speed. Hence Jupiter is called the Stormy planet.
In simple words: Jupiter is known as the "Stormy Planet" due to its rapid rotation and powerful atmospheric currents, which generate persistent, massive storms like the Great Red Spot.

🎯 Exam Tip: Jupiter's fast rotation combined with its gaseous composition leads to its stormy weather patterns.

Question 8. Uranus appears rolling along on its orbit.
Answer: Uranus axis is so greatly inclined that it, appears as if it is rolling along on its orbit.
In simple words: Uranus's axis is tilted almost parallel to its orbit, making it look like it's rolling around the sun rather than spinning upright.

🎯 Exam Tip: The highly inclined axial tilt is the specific characteristic that makes Uranus appear to "roll" during its orbit.

Question 9. Saturn is considered to be a peculiar planet.
Answer:
(1) Saturn is considered as peculiar planet because of its rings around it.
(2) Though its mass is 95 times that of the earth, its density is very low.
(3) If it were dropped into a large sea enough to hold it, it would float in it.
In simple words: Saturn is peculiar due to its stunning ring system, its remarkably low density (it would float in water), and its massive size despite being so light.

🎯 Exam Tip: Saturn's rings and its exceptionally low density are its most distinguishing "peculiar" features.

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