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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 8 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 8
What is the value of one light year?
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$${9.4 \times 10^{12} km }$$
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$${9.46 \times 10 ^{10}km}$$
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$${9.46 \times 10 ^ {14} km}$$
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$${9.46\times 10 ^ 8 km}$$
Explanation
We know speed of light is $$300000km/s$$
And One year=$$365\times 24\times 60\times 60 =31536000s$$
And one light year is defined as distance travelled by light in one year.
So One Light year=$$300000km/s\times 31536000=9.46 \times 10^{12}km$$
Which of the following is not a member of the solar system?
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An asteroid
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A satellite
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A constellation
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A comet
Explanation
The Sun and the celestial bodies which revolve around it form the solar system. It consists of a large number of bodies such as planets, comets, satellites, asteroids, and meteors.
Constellations are groups of stars that appear to form recognizable shapes.
A constellation is not a member of the solar system.
What do all four gas giants have that terrestrial
planets do not have?
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Atmosphere
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Solid surfaces
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Moons
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Rings
Explanation
The terrestrial planets are the planets which are closer to the Sun. These planets includes the Mercury, Venus, Earth and Mars. These planets are made of rock and metals.The gas giant planets are those which are the farthest from the Sun. They are the outer planets of our solar system and includes Saturn, Jupiter, Uranus and Neptune. These planets are composed of gases and have little hard rocky material at their core. However, these planets have rings around them which is mostly composed of gases, moons etc, but the terrestrial planets do not have such rings around them.
So correct answer is option D
(Rings).
The bright head of the comet is known as
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Pointer
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Nucleus
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Coma
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Shooter
Explanation
Comets are snowballs of frozen gases, rock, and dust that orbit the Sun. When frozen, they are the size of a small town.
Astronomers have identified three main parts of a comet: the nucleus, coma and tail.
The bright head of the comet is known as Coma.
The center of a comet's head is called its nucleus.
The tail consists of gas and dust that can extend hundreds of millions of kilometers away from the coma.
Which of the following is not a member of the solar
system?
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An asteroid
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A satellite
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A constellation
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A comet
Explanation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived outline or pattern, typically representing an animal, mythological person or creature, or an inanimate object. The origins of the earliest constellations likely go back to prehistory.
What is the big bang?
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The collision of galaxies.
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The formation of galaxies.
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The beginning of the universe's expansion.
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The time when stars began to form.
Explanation
The rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
Ursa Major constellation appears to revolve
around the pole star in the night sky.
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True
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False
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Ambiguous
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Data Insufficient
Explanation
Ursa Major is also known as the Big Dipper,
the Great Bear, or the Saptarshi.
It appears like a big
ladle or a question mark. There are three
stars in the handle of the ladle and four
in its bow.
Ursa Major constellation appears to revolve around the pole star in the night sky.
Which of the following is NOT a planet of the sun ?
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Sirius
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Mercury
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Saturn
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Earth
Explanation
Sirius is a star,it is not a planet of the sun.The star Sirius is the brightest star in the sky. It is commonly known as the Dog Star.
INSAT is an artificial satellite.
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True
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False
In which part of the sky can you find Venus if it is visible as an evening star ?
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eastern
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western
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northern
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southern
Explanation
Venus can be seen in the western sky after sunset and is called the evening star.
Column-I
Column-II
(1) Ursa Major
(a) The queen
(2) Orion
(b) Big bear
(3) Cassiopeia
(c) Pole star constellation
(4) Ursa minor
(d) Hunter
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(1) $$\rightarrow$$ b; (2) $$\rightarrow$$ d; (3) $$\rightarrow$$ c; (4) $$\rightarrow$$ a.
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(1) $$\rightarrow$$ b; (2) $$\rightarrow$$ a; (3) $$\rightarrow$$ d; (4) $$\rightarrow$$ c.
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(1) $$\rightarrow$$ c; (2) $$\rightarrow$$ d; (3) $$\rightarrow$$ a; (4) $$\rightarrow$$ b.
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(1) $$\rightarrow$$ b; (2) $$\rightarrow$$ d; (3) $$\rightarrow$$ a; (4) $$\rightarrow$$ c.
Explanation
Ursa major looks like a big bear.
Orion is named after a hunter of Greek.
Cassiopeia is named after vain queen of Greek mythology .
Ursa minor has pole star as its brightest star.
Halley's comet can be seen from the Earth after every 26 years.
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True
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False
Explanation
Halley's comet appears once every 76 years. It was last seen in 1986.
Which of the following doesn't belong to the class of superior planets?
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Venus
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Neptune
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Uranus
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Mars
Explanation
Superior planets are those planets that are farther from the earth than the Sun. Except Mercury and Venus's rest are superior planets.
The part of a meteor which reaches the earth's surface is called a
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comet
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meteorite
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shooting car
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nebulae
Explanation
Meteorite is the part of meteor which reaches the earth's surface.
Which of the following is the smallest planet?
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Jupiter
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Venus
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Mercury
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None of the above
Explanation
Mercury is the smallest planet in our solar system. Only slightly larger than Earth's Moon.
Days and nights are caused by
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rotation of the Earth
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revolution of the Earth
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both rotation and revolution of the Earth
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neither rotation nor revolution of the Earth
Explanation
As earth is rotating on its own axis so when its half part is exposed to sun receives light due to which it is day at that part and hidden half part suffers from darkness called night.And as earth rotates these halves keep changing so that's why sometimes there is day at a place and at the same place sometimes there is night.
Which of the following heavenly bodies is different from others?
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Ursa Major
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Ursa Minor
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Alpha Centauri
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Scorpio
Explanation
Alpha Centauri is the star system closest to the solar system being $$4.37$$ light years away from the Sun but Usra Minor, Ursa Major, and Scorpion is the group of stars that is inside the solar system.
The nearest star to the Earth (apart from the Sun) is 'alpha centauri' which is about .......... away form the Earth
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4.3 light years
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3.26 light years
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$$4.3 \times 10^{12}$$ km
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$$3.26 \times 10^{15}$$ km
Explanation
Alpha century is a star system closest to earth other than sun. Its distance from the earth is about $$4.367$$ light years.
Which of the following is different from others?
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light year
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parsec
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astronomical unit
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micron
Great Bear is commonly known as
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Saptarshi
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Dhruv tara
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Pole star
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Orion
Explanation
In ancient Indian astrology, the group of stars of the Big Dipper (part of the constellation of Ursa Major) is called Saptarishi. The Indian name of “Saptarishi” Constellation is Ursa Major or Great Bear.
Use figure given below that shows our Solar system to answer the given questions. The objects C and E are collectively called :
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Jovian planets
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Inferior planets
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Superior planets
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Gas giants
Explanation
The planets which orbits are closer to the sun than the Earth are called Inferior planets. So as per the given figure the objects C and E are collectively called Inferior planets. The inferior planets are Mercury and Venus which orbits the Sun inside the Earth's orbit, plus a small number of recently discovered minor planets. All the other major planets, and the majority of the minor planets are superior planets.
The best time for observing an inferior planet is when it is at its greatest elongation from the Sun.
Mass of Jupiter is ........... times that of Earth.
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318
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195
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95
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0.8
Explanation
Mass of the jupiter is about $$318$$ times than that of earth.
The planet having the largest diameter is
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Jupiter
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Saturn
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Pluto
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Mars
Explanation
Jupiter is the largest planet in the universe. Its diameter is about $$1.3\times { 10 }^{ 5 }$$
km.
During the day the surface temperature on moon is
___________.
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$$-{100}^{o}C$$
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$${100}^{o}C$$
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$$-{168}^{o}C$$
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$${168}^{o}C$$
Explanation
During the day the surface temperature on moon is $$100^{\circ}C$$
The hottest planet of the solar system is:
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Mercury
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Pluto
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Jupiter
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Venus
Explanation
Venus is the hottest planet among the following. Venus is the second planet from the sun and has a temperature that is maintained at $$462 ^oC$$.
The planet Jupiter is bulged at the centre and flattened at the poles because of
___________.
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movement of gases
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heaviness of the planet
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rotation of the planet
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revolution of the planet
Explanation
As Jupiter is a gas giant, the rotational motion of the planet makes it flattened at the poles.
The time taken by a radio wave to go and come back after reflection from a communication satellite is.
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$$\frac {1}{4}s$$
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$$\frac {1}{2}s$$
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1s
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$$\frac {1}{8}s$$
Which of the following planets is coldest in the solar system?
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Mercury
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Neptune
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Venus
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Earth
Explanation
Neptune, which is currently accepted to be the farthest planet revolving around the sun, is the coldest planet in solar system.
The largest planet in the solar system is _______.
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Saturn
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Jupiter
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Mars
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Earth
Explanation
Order of solar system is given in the above figure.
The largest planet in the solar system is
Jupiter
.
Ans: Jupiter
All the stars appear to move from
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west to east
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east to west
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north to south
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south to north
Explanation
As earth is rotating on its own axis from west to east and we observe stars from earth so
due to relative motion star appears to move from east to west in opposite sense.
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