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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 1 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 1
The most massive planet in the solar system is _______ .
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Saturn
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Earth
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Venus
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Jupiter
Explanation
The Jupiter is the most massive planet in the solar system. It is 300 times bigger than the earth.
Patterns of stars in the sky are called
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Satellites
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Planets
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Configurations
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Constellations
Explanation
The pattern of stars in the sky are called Constellations. Some of the famous Constellations are Cyprus, Orion, Ursa Minor, Gemini, Taurus, Libra etc.
The movement of Moon around Earth is called
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Translation
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Oscillation
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Rotation
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Revolution
Explanation
Movement of moon of its own axis is called Rotation movement around the Sun is called Revolution.
What is sun?
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Star
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Planet
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Rock
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Satellite
Explanation
Sun is a star that has its own source of energy by means of fusion reaction of Hydrogen into Helium.
Day and night are caused by
___________.
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Revolution of the earth
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Rotation of the earth
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Both rotation and revolution of the earth
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None of these
Explanation
Rotation is the movement of the earth on its axis. The earth takes about $$24\ hours$$ to complete one rotation around its axis.
Day and night are caused by the rotation of the earth.
Red planet:Mars; hottest planet:_______.
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Saturn
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Venus
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Mercury
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Jupiter
Explanation
Venus is the hottest planet of the solar system. This is because of high content of greenhouse gases that traps the heat from the sun and make it even hotter than Mercury, which is the closest planet to the sun.
Ursa Major resembles:
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a bear
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a bowl
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a hunter
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a dog
Explanation
Ursa Major constellation resembles a bear.
After sun, the star closest to the earth is :
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Alpha Centauri
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Siris
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Pole star
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None of these
Explanation
The star closest to the earth after the sun is Alpha Centauri.
Two third part of which planet is covered with water?
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Jupiter
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Earth
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Saturn
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Venus
Explanation
Only earth has large reserves of water and two-third part of the earth is covered with water.
Indra is the Indian name of
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Uranus
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Saturn
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Earth
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Pluto
Explanation
According to Indian mythology, Uranus is named as Indra.
Mangal is the Indian name of
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Earth
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Mars
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Uranus
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Pluto
Explanation
The planet Mars is known as Mangal Graha in India.
Pole Star is one of the stars in:
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Ursa Minor
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Ursa Major
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Andromeda
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Cancer
Explanation
Answer is (A).
Pole star belongs to Ursa Minor constellation. The closest bright star to the north celestial pole is Polaris or pole star. At an apparent magnitude 1.97, it is the brightest star in the Ursa Minor constellation.
Fill in the blank:
The plane, in which the Earth revolves around the Sun, is called _______ plane of Sun.
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equatorial
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tangential
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normal
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orbital
Explanation
The plane in which Earth revolves around the Sun is the orbital plane or ecliptic.
The planets keep changing their position with respect to:
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Galaxy
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Stars
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Venus
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Moon
Explanation
Planets are solid heavenly bodies that revolve around the Sun in closed elliptical paths. A planet is made of rock and metal and produces no light of its own. A planet shines because it reflects the light of the Sun. Since the planets are much nearer to the stars, they appear to be big and do not twinkle at night. The planets move around the Sun from West to East, so the relative positions of the planets keep changing day by day. They are very small compared to the sun and other stars.
Hence, the star appears to remain in a fixed position with respect to each other whereas the distance between the planets keeps changing constantly.
Which of the following units is used to measure distance between the stars?
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$$km$$
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$$m$$
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$$light\ year$$
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$$fm$$
Explanation
$$Light\ year$$ is an unit in astronomy to measure distances between the stars. A light year distance travelled by light in vacuum in one year which is equal to $$1\ light\ year = 9.46 \times 10^{15}\ m$$.
Morning star is the name given to
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pole star
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star Sirius
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planet Jupiter
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planet Venus
Explanation
Morning star is a name for the planet Venus when it appears in the eastern sky before sunrise.
This planet is called a morning star when its orbital position changes leading it to appear bright in the morning rather than in the evening.
All the stars are at the same distance from us. This statement is
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True
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False
Explanation
Our Sun is the nearest star to the Earth. After the Sun, the next nearest star is 4.3 light years away. A light year is the distance light travels in one year. One light year is 10 trillion kilometers. Hence, all the stars are not the same distance from our Earth. They are at different distances. Hence, given statement is false.
Light year is the unit of
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distance
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time
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speed
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mass
Explanation
Light year is the distance travelled by light in vacuum in one year.
One light year $$=9.467\times 10^{15}\ m$$
Which of the following figures depicts the position of pole star correctly?
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Explanation
The pole star is towards the North Pole as shown in figure in option (A).
Fill in the blank:
The Halley's comet appears in the sky after ________.
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67 years.
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167 years.
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76 years.
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100 years.
Explanation
Comets are large snowballs of frozen gases, rock, and dust that orbit the Sun.
Halley’s comet appears after nearly every 76 years. It was last seen in 1986.
A Light year is
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Light emitted by the Sun in one year.
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Time taken by light to travel from Sun to Earth.
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The distance travelled by light in one year.
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Time taken by Earth to go once around the Sun.
Explanation
1 light year $$=$$ speed of light in vacuum $$\times$$ no. of seconds in one year
$$1\ LY =(3\times 10^8)\times (365\times 24\times 60\times 60)=9.467\times 10^{15}\ m$$
A light-year is defined as the distance traveled by light in a vacuum in one year.
Fill in the blank:
The planet farthest from the Sun is _______.
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Jupiter
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Saturn
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Uranus
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Neptune
Explanation
There are officially only eight planets in our solar system. The order of the planets from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Hence, the planet farthest from the Sun is Neptune.
A star like body with a long tail is called:
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Comet
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Meteor
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Meteorite
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Pluton
Explanation
A comet is an icy small celestial body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet.
Hence, a star like body with a long tail is called comet.
Fill in the blank:
A shooting star is a _______.
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comet
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meteor
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meteorite
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none of the above
Explanation
Shooting stars look like stars that quickly shoot across the sky, but they are not stars. A shooting star is really a small piece of rock or dust that hits Earth's atmosphere from space. It moves so fast that it heats up and glows as it moves through the atmosphere. Shooting stars are actually what astronomers call meteors. Most meteors burn up in the atmosphere before they reach the ground. However, once in a while a meteor is large enough than some of it survives and reaches Earth's surface. Then it is called a meteorite.
Hence, shooting star is a common name for the visible path of a meteoroid as it enters the atmosphere, becoming a meteor.
The first satellite to put into space by India is:
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INSAT
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Aryabhatta
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Rohini
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Bhaskara
Explanation
Aryabhata was India's first satellite, named after an Indian astronomer of the same name.
It was launched by the Soviet Union on 19 April 1975 from Kapustin Yar using a Kosmos-3M launch vehicle. It was built by the Indian Space Research Organisation (ISRO) to gain experience in building and operating a satellite in space. The launch came from an agreement between India and the Soviet Union directed by U.R. Rao and signed in 1972.
Pole star is located in Ursa Major. This statement is
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True
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False
Explanation
Th pole star is located in Ursa Minor constellation, not in Ursa Major.
Who is regarded chief of solar system?
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Sun
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Moon
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Earth
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Sky
Explanation
Sun is regarded as the chief of solar system. It is because all of the other planets circle around it due to the gravitational pull because of its enormous mass.
All the planets in the solar system revolve around the Sun in same plane. This statement is
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True
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False
Explanation
Most of the planets orbit the Sun very near the same plane in which the Earth orbits, the ecliptic.
The orbits of the planets are ellipses with the Sun at one focus, though all except Mercury are very nearly circular. The orbits of the planets are all more or less in the same plane (called the ecliptic and defined by the plane of the Earth's orbit). The ecliptic is inclined only 7 degrees from the plane of the Sun's equator.
Hence, the statement is true.
The Indian name of the planet is
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Graha
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Akash ganga
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Dhruva tara
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None of these
Explanation
In India name of the planet is $$\text{Graha}$$
Fill in the blank:
The planet nearest to the Sun is ________.
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Mercury
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Venus
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Mars
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Earth
Explanation
There are officially only eight planets in our solar system. The order of the planets from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Hence, the planet farthest from the Sun is Mercury.
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