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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 12 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 12
Of the following types of meteorological phenomena, tell which one can cause damage to crops:
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Dew
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Rains
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Hailstone
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Duststorm
Explanation
Hail crop damage can severely affect the health of plant and decimate the harvest.
The new plants which are sprouting and growing tender new leaves and stems, hail crop damage can completely kill seedlings. Hail later in the season will reduce harvests by knocking fruit off plants.
Which one of the following stars is nearest to the earth?
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Sun
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Alpha Centauri
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Polaris
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Sirius
'The length of its day and the tilt of its axis are almost identical to those of the earth.' This is true of
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Saturn
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Nepture
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Uranus
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Mars
Comet Shoemaker-Levy 9 hit the planet
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Jupiter
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Mars
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Pluto
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Saturn
Ursa Minor is
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A group of stars that from the little Dipper in the most northern constellation.
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The name of a satellite
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The name of an island
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The name of a decrease in USA
Which is the first planet to be discovered in modern times?
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Saturn
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Pluto
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Mercury
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Uranus
It was the first spaceprobe to reach and study Jupiter:
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Pioneer - 10
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Viking - I
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Voyager - I
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Galileo
The approximate tilt of the moons orbit is:
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$$15^{\circ}$$
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$$10^{\circ}$$
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$$5^{\circ}$$
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$$1^{\circ}$$
Explanation
The Moon's orbit about the Earth lies in a plane which is tilted by about 5.15° with respect to the plane of the Earth's orbit about the Sun. (If this tilt was zero, we would have total solar and lunar eclipses every month!)
In which planet sun sets in east?
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Saturn
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Venus
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Mercury
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Pluto
Explanation
Since Venus rotates on its axis from east to west,
on Venus, the Sun rises in the West and sets in the East.
Answer-(B)
Which of the following describes the theory of the moons formation?
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Our moon is an escaped moon from another planet
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The moon was formed with the solar system from clouds of gas and dust
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A giant asteroid hit the Earth and blew off a large piece which was caught in orbit
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The moon was formed elsewhere and was caught by Earths gravity as it passed by
Explanation
Most accepted theory of moon formation is giant-impact theory. It proposes that the Moon formed during a collision between the Earth and another small planet (like asteroid) about the size of Mars. The debris from this impact collected in an orbit around Earth to form the Moon.
Hence Option D
Planets are divided into two groups based on their characteristic.
Group - 1
Group - 2
Structure of planets resemble to earth
Structure of planets resembles Jupiter
They have fewer natural satellites
They have large number of natural satellites
They have a thin atmosphere
Rings are seen around planets.
Which of the following are included in Group - 2?
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Mercury and Venus
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Saturn and Mercury
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Jupiter and Saturn
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Jupiter and Venus
Explanation
All the planets among Jupiter, Saturn, Neptune and Uranus all in the second group.
Hence, for among given options the pair Jupiter and Saturn fall in second group.
Answer-(C)
Which of the following statements best describes one way that the Moon is different from Earth?
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The Moon is not solid.
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The Moon has no gravity.
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The Moon has almost no atmosphere
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The Moon receives almost no solar light.
Explanation
The gravitational force on the moon is $$\dfrac{1}{6} th$$ of the gravitational force on the earth. Because of this less gravitational force, the moon can not hold the atmosphere around it. So there is no atmosphere around the moon.
Which of the following was the first Indian satellite
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INSAT-1B
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INSAT-1A
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Rohini
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Aryabhatta
Explanation
The Aryabhata spacecraft, named after the famous Indian astronomer, was India's first satellite; it was completely designed and fabricated in India and launched by a Soviet Kosmos-3M rocket from Kapustin Yar on April 19, 1975.
A waxing crescent moon
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is a phase where the crescent increases from one day to another
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is a phase where the crescent decreases from one day to another
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is a phase where in the next day to the crescent is a new moon day
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is a phase where in the next day to the crescent is a full moon day
Explanation
A waxing crescent moon is when the Moon looks like crescent and the crescent increases ("waxes") in size from one day to the next. This phase is usually only seen in the west.
'X' is a group of stars visible during the winter season in the late evening. It resembles a hunter in the kneeling position. What is 'X'?
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Ursa Major
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Orion
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Cassiopeia
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Aquarius
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.
Which of the following is a proof of the Earth's revolution around the Sun?
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Rising and setting of the Sun
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The Foucault pendulum experiment
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Parallax of stars
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Seasons
Explanation
Earth revolves in an elliptical orbit and not circular, so when the earth moves far from the sun we see winters and when it moves close to the sun we see summer and this happens every year. This confirms that the earth revolves around the sun.
Asteroids orbit around the sun in belt_____________.
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beyond Uranus
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between Jupiter and Saturn
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between Jupiter and mars
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between Earth and Mars
Explanation
There is a large gap in between the orbits of Mars and Jupiter . This gap is occupied by a large number of asteroids that revolve around the Sun. This constitutes the asteroid belt.
Asteroids are small, rocky objects that orbit the Sun. Although asteroids orbit the Sun like planets, they are much smaller than planets. There are lots of asteroids in our solar system.
Which of the following is correct?
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1 light year $$=6.3\times {10}^{4}$$ astronomical unit
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1 parsec $$=3.26$$ light year
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$$1$$ fermi$$={10}^{-15}m$$
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All of these
Explanation
$$1$$ light year $$=6.3 \times 10^4$$ astronomical units.
Thus option (A) is correct.
Which of the following statement is incorrect?
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Planet jupiter shows phases like Moon
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The axis of rotation of Earth is slightly tilted with respect to the plane of its orbit around the Sun
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Diameter of Jupiter is about 11 times the diameter of the Earth
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Planet Uranus is made up mainly helium and nitrogen gases
Explanation
Jovian planets do not show phases, as from Earth's perspective they do not cast a shadow. Planets with orbital distance from sun, greater than that of Earth's orbital distance do not show phases from earth.
A star is seen to be rising on the eastern horizon at $$23:00$$ hrs. At what time the star will rise 2 days later
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$$00:00$$ hrs
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$$21:40$$ hrs
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$$23:20$$ hrs
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$$23:00$$ hrs
Explanation
As a Star very far from us appears moving due to the earth's rotation about its axis. Its period to rise is exactly equal to the time required for one complete rotation of the earth. Because each takes exactly $$24$$ hours to complete one rotation. So after days $$(2\times 24\ hrs)$$. So star will be seen rising at the same time
$$(i.e., 23:00\ hrs)$$
Why is the tail of a comet formed, when it comes closer to sun ?
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Ice present in the comets gets vaporised
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When it comes closer to sun, vapour converts into ice
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Dust particle in the comets gets heated
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Both option A and C
Explanation
The tail of comets is formed when comets come closer to the sun because the sun's heat vaporises some of the comets' material, releasing dust particles that were trapped in the ice.
The correct options are both A and C. Option D is the answer.
What are the rocks which failed to form the planets called?
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Satellites
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Asteroids
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Comets
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Pulsars
Explanation
Asteroids are small, rocky objects that orbit the Sun. Although asteroids orbit the Sun-like planets, they are much smaller than planets. There are lots of asteroids in our solar system. Most of them are located in the main asteroid belt – a region between the orbits of Mars and Jupiter.
Which of the following planets is called "Blue planet"?
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Venus
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Earth
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Uranus
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Mercury
Explanation
Earth is called the "Blue Planet" due to the abundant water on its surface. This is because liquid water covers most of the surface of the planet. The Earth has the right mass, chemical composition, and location can support liquid water.
Which of the following planets has largest number of satellites or moons?
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Jupiter
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Neptune
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Earth
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Saturn
Explanation
Jupiter has the largest number of satellites or moons. The planet Jupiter has 67 confirmed moons. This gives it the largest retinue of moons with "reasonably secure" orbits than any planet in the Solar System.
Which of the following planets is smaller in size than the Earth?
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Venus
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Uranus
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Saturn
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Neptune
Explanation
Venus is smaller in size than the earth. The diameter of the earth is 12,742 km while that of Venus is 12,100 km.
Which one of the following planets is the brightest?
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Mars
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Mercury
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Venus
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Jupiter
Which planet takes the longest time to go around the sun?
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Earth
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Jupiter
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Uranus
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Neptune
Explanation
Neptune takes the longest time to go around the sun. Neptune orbits the Sun at an average distance of 4.5 billion km. Like all the planets in the Solar System. Neptune follows an elliptical path around the Sun. varying its distance to the Sun at different points along its orbits.
The Asteroid belt is found between which of the following?
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Earth and Mars
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Jupiter and Saturn
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Mars and Jupiter
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Saturn and Uranus
Explanation
Asteroids are small, rocky objects that orbit the Sun.
The Asteroid belt is found between Mars and Jupiter. The large majority of known asteroids orbit in the asteroid belt between the orbits of Mars and Jupiter. or are co-orbital with Jupiter.
The object which comes from outer space burns when enters into the earth's atmosphere is called ________.
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Meteorite
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cornet
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meteor
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asteroids
Explanation
Meteorites are celestial objects that come from outer space and burn when enter into the earth's atmosphere due to the friction with it.
Which planet was named after the Roman God Zeus?
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Earth
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Mars
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Venus
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Jupiter
Explanation
Jupiter
was named after the Roman God Zeus. Zeus is the "Father of Gods and men" who rules the Olympians of Mount Olympus as a father rules the family according to the ancient Greek religion. He is the God of sky and thunder in Greek mythology. Zeus is etymologically cognate with and, under Hellenic influence, became particularly closely identified with Roman Jupiter.
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