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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 4 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 4
When does Orion appear in the sky? (from India)
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Early in the night in winter.
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Late in the evening in winter.
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Early in the evening in summer.
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Late in the night in winter.
Explanation
Orion is clearly visible in the late evening sky , during winters in the Northern hemisphere and summers in the Southern hemisphere.
Fill in the blanks:
In Ursa Major, _______ stars form the shape of the handle and ______ stars form the shape of the bowl of the ladle respectively.
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$$4, 3$$
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$$5, 6$$
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$$3, 4$$
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$$2, 5$$
Explanation
The $$7$$ prominent stars of Ursa Major for the shape of a big ladle in which $$3$$ stars form the handle and the other $$4$$ form the bowl of the ladle.
Only few stars of a constellation are clearly visible through naked eyes because:
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those are the prominent ones
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those are close to the Earth while others are far away
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others are covered by clouds
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others are a myth
Explanation
Many stars form a constellation but only few of them shine brightly and can be seen through naked eyes clearly. These are the prominent stars of the constellation that help in locating the constellation.
Because of its highly tilted axis, ________ appears to roll along the orbital plane.
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Uranus
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Mercury
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Saturn
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Venus
Explanation
A unique feature of Uranus is that it appears to roll along its orbital plane. This is because it has a highly tilted axis which makes it almost parallel to its orbital motion and the planet appears to roll.
Fill in the blank:
Ursa major appears to revolve around the _______.
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Sirius
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Alpha Persei
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Pole star
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Alpha Centauri
Explanation
Pole star lies close to the axis of rotation of Earth and hence appears to be fixed in one position. The other stars and constellation including the Ursa Major appear to revolve around it.
Hunter constellation can be used to locate ________.
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Pole star
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Apollo
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Sirius
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Rigel
Explanation
Hunter is another name for the constellation Orion, which can be used to locate the brightest star Sirius by extending an imaginary straight line from the three middle stars towards the East.
Leaving the $$3$$ middle stars apart, which shape is formed by the remaining $$4$$ bright stars of the Orion?
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Circle
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Irregular circle
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Triangle
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Quadrilateral
Explanation
Orion is another well-known constellation that can be seen during winter in the late evenings. It is one of the most magnificent constellations in the sky. It also has seven or eight bright stars. Orion is also called the Hunter. The three middle stars represent the belt of the hunter. The four bright stars appear to be arranged in the form of a quadrilateral.
To locate the Pole Star using Ursa Major, to which direction should the imaginary line be drawn?
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North
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West
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East
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South
Explanation
Pole star can be located using Ursa Major by extending an imaginary line from the last two stars towards the North direction.
Cassiopeia appears in _________ hemisphere.
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northern
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southern
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eastern
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western
Explanation
Cassiopeia constellation appears in the northern hemisphere and can be seen in winter during the early part of the night.
This planet, _______ is yellowish in color and has many rings and satellites.
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Uranus
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Jupiter
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Neptune
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Saturn
Explanation
Saturn is yellowish in colour and has many rings and satellites.
Jupiter, Saturn, Uranus and Neptune are known as the ______ planets.
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inner
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cold
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outer
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dwarf
Explanation
A belt of asteroids is present between the orbits of Mars and Jupiter. This belt separates the planets into inner planets and outer planets. The planets before the belt of asteroids are called inner planet and the ones outside are called outer planets. Therefore, Jupiter, Saturn, Uranus and Neptune are called outer planets.
Pluto is termed as the _______ planet.
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inner
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outer
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dwarf
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giant
Explanation
Pluto was once considered to be a planet of our solar system. Since 2006, according to the International Astronomical Organization, it is no more considered a planet and is termed as a dwarf planet.
Venus: brightest planet:: Jupiter: _________
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Reddish planet
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Smallest planet
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Dim planet
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Largest planet
Explanation
Venus is the brightest planet of our solar system and Jupiter is the largest.
_________ stated that Sun was the centre of our universe and not Earth.
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Albert Einstein
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Isaac Newton
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Nicolaus Coppernicus
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Galileo Galilei
Explanation
In ancient times, it was believed that the Earth was at the center of the universe and the moon, the planets, the Sun, and stars were orbiting around it. About $$500$$ years ago, a Polish priest and astronomer, named Nicolaus Copernicus $$(1473 – 1543)$$, stated that the Sun was at the center of the solar system and the planets revolved around it.
Mercury and Venus, both, do not have any
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atmosphere
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solid matter
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satellite
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fixed orbit
Explanation
Mercury and Venus have no natural satellites. they are both inner planets and inner planets tend to have very few or no satellites and rings.
Planets, which rotate from east to west are ______ and ________.
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Venus, Uranus
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Uranus, Jupiter
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Mercury, Mars
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Neptune, Earth
Explanation
Venus and Uranus are the only two planets that rotate from east to west.
The planet, ________ is called morning or evening star.
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Jupiter
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Venus
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Saturn
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Earth
Explanation
Venus is the brightest of all planets. It can be seen sometimes in the eastern sky before sunrise and in the western sky just after sunset. Hence, it is called the morning or evening star.
Which of the following properties is not exhibited by planets?
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Do not have their own light
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Revolve around the sun and rotate around itself
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Keep changing their position
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Follow randomly changing orbits
Explanation
Planets do not have their own light. Those merely reflect the Sun's light that falls on them.
Planets revolve around the Sun while rotating on axes.
Planets keep changing positions.
However, each planet has a particular orbit in which it revolves around the Sun. Planets do not change their orbits randomly.
The time taken by a planet for one complete revolution changes according to:
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Its distance from the Sun
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Its size
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Its mass
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The shape of its orbit
Explanation
A planet has a definite path in which it revolves around the Sun. This path is called an orbit. The time taken by a planet to complete one revolution is called it's period of revolution. The period of revolution increases as the distance of the planet increases from the sun.
________ is the fastest rotating planet.
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Saturn
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Jupiter
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Uranus
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Earth
Explanation
Jupiter is the fastest rotating planet. It takes only $$9$$ hours and $$55$$ mins to complete one rotation about its own axis.
Find the odd one out:
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Jupiter
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Saturn
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Mars
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Earth
Explanation
Earth is the only planet that has life on it. All the rest have no trace of life on those.
Identify the true statement(s) for comets:
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Those are messengers of disaster
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Many comets appear after a fixed time interval
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Occurrance of comets is a natural phenomenon
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The tail of the comet is always directed towards the sun
Explanation
Occurance of comets is a natural phenomenon and there is nothing superstitious about it. Many comets appear after fixed time interval for example, Halley"s comet which appears once in every 76 years.
Planets do not collide with each other because
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those are of different sizes
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those have fixed, non-intersecting individual orbits
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those rotate from West to East
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each planet has a different time of rotation and revolution
Explanation
Every planet is at a different distance from the Sun and has a fixed orbit in which it revolves around the Sun. The Sun"s gravitational force holds the planets in this place and they do not collide with each other as their orbits are non-intersecting.
There is life on Earth because of:
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optimum sunlight
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presence of water and atmosphere
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presence of ozone layer
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All of the above
Explanation
Earth is at an optimum distance from the Sun, therefore the sunlight reaching the Earth is not extremely hot. Also, the ozone layer prevents the entry of harmful rays. Earth also has presence of water and atmosphere that are essential for life to grow.
Hence, option D) All of the above, is correct.
Identify the wrong statements for asteroids:
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Revolve around the Sun
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Separate inner and outer planets
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Can only be seen through any telescopes
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Asteroids are rock-like structures
Explanation
Asteroids are rock-like structures that occupy the huge gap between the orbits of Mars and Jupiter.
Those, too, revolve around the Sun in a similar orbit.
Those form a belt-like structure known as the asteroid belt and the planets before the asteroid belt i.e., Mercury, Venus, Earth, and Mars, are called inner planets. The planets that lie beyond the asteroids i.e., Jupiter, Saturn, Uranus, and Neptune are called outer planets.
Since the asteroids are smaller in size, those can only be seen through large and powerful telescopes, not through any telescope.
Why does Venus show phases like the moon?
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It rotates from East to West
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It is covered by clouds
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Its atmosphere is dense
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None of the above
Explanation
Just like the moon, Venus too rotates from East to West. Thus, only that part of Venus is visible to us which reflects the light from the Sun towards us. Hence, Venus appears to show phases because the Earth and Venus rotate in opposite directions.
Earth : Bluish green :: ________ : Reddish.
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Mars
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Mercury
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Jupiter
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Uranus
Explanation
Earth appears to be bluish-green in colour and Mars appears to be reddish in colour. Hence it is also known as the red planet.
The planet Mercury:
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is a very small planet and hence not visible
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is very far from Earth as compared to other planets
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remains covered by clouds most of the day time
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is hidden by the glare of the Sun and hence not visible during the day time
Explanation
Mercury is the first planet of our solar system. It is very close to the Sun and is mostly hidden because of excessive light or glare of the Sun. Hence, it is not easily visible. However, it can be seen just before sunrise or just after sunset from places where trees and buildings do not disturb the view.
Brightest planet in the night sky is:
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Jupiter
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Venus
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Earth
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Mars
Explanation
Venus is the brightest planet in the night sky and can be spotted easily.
Comets revolve around the Sun:
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In a highly elliptical orbit
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Along a circular orbit
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In an elliptical orbit
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Varying orbit depending on the comet
Explanation
Comets are also members of our solar system. They revolve around the Sun in highly elliptical orbits. However, their period of revolution around the Sun is usually very long.
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