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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 7 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 7
The full moon night is called:
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Purnima
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Amavasya
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Both (A) and (B)
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None of them
Explanation
The full moon night is called purnima as well new moon is called amavasya.
Asteroids are
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Small broken pieces of planets
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Shooting stars
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Found in a belt between Earth and Venus
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None of these
Explanation
Asteroids are a group of rock pieces forming a belt moving around the sun in between Mars and Jupiter. They are believed to be the remains of a large planet that collided with each other during the expansion of the solar system.
The relative positions of the stars in the night sky
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are absolutely fixed and therefore we can name constellations with certainty.
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change appreciably over about four thousand years, which is why the ancient. Egyptians named different constellations than those of today
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are changing, but very slowly such that appreciable change cannot be observed even over several centuries or even several thousand years.
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appear to change because the sun moves among them over the course of a year.
Explanation
Everything in nature tries to be at its minimum potential energy. Planetary objects stay in their places due to their gravitational potential energy, they tend to stay at a distance where its minimum
Which of the given planets is the brightest?
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Mercury
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Venus
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Mars
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Jupiter
Explanation
Venus is the brightest planet
because its thick clouds reflect most of the sunlight that reaches it
(about 70%) back into space, and because it is the closest planet to Earth.
Match pairs.
Section-A
Section-B
$$(1)$$ Jupiter
(P) Bluish colored planet
$$(2)$$ Mars
(Q) The most bright planet
$$(3)$$ Venus
(R) The biggest planet
$$(4)$$ Neptune
(S) Reddish colored planet
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$$1$$-Q, $$2$$-P, $$3$$-S, $$4$$-R
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$$1$$-Q, $$2$$-P, $$3$$-R, $$4$$-S
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$$1$$-R, $$2$$-S, $$3$$-Q, $$4$$-P
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$$1$$-R, $$2$$-S, $$3$$-P, $$4$$-Q
Explanation
(1): Jupiter is the biggest planet in our solar system.
(2): Mars is a reddish coloured planet because of the presence of ferric oxide in its crust.
(3): Venus is the most bright planet.
(4): Neptune is the blue coloured planet.
Which of the following is not a member of the solar system?
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Artificial Satellite
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Shooting star
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Sun
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Asteroids
Explanation
Artificial satellite is a man-made object sent into the space and thus it is not a member of the solar system. Whereas shooting star, sun and asteroids are natural objects and so are the member of solar system.
Choose the correct option to complete the statements given.
Full moon night occurs once every ________.
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Day
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$$15$$ days
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$$20$$ days
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Month
Explanation
Full moon day occurs once every month.
The earth and other planets _______ around the sun.
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revolve
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rotate
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moves with constant acceleration
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remain steady
Explanation
revolve
The Earth and other planets revolve around the Sun due to its gravitational force.
The earth ________ about its (imaginary) axis.
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revolves
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rotates
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moves with constant acceleration
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remains steady
Explanation
rotates
The Earth rotates about its imaginary axis in space.
Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth's rotation.
The hottest planet of solar system is
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Mars
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Mercury
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Venus
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Pluto
Explanation
The hottest planet of the solar system is the one that is nearest to the sun.
Venus is the nearest to the sun. Therefore, Venus is the hottest planet.
Meteors are
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Small stars
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Burnt pieces of comets that fall on earth
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Comets without tails
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None of these
Explanation
Meteors are burnt pieces of comets. When they reach earth's atmosphere they start burning due to the friction with the atmosphere.
The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?
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0%
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Explanation
The revolution of the Moon around the Earth makes the Moon appear as if it is changing shape in the sky. From Earth we see the Moon grow from a thin crescent to a full disk (or full moon) and then shrink back to a thin crescent again before vanishing for a few days.
The phases of the Moon depend on its position in relation to the Sun and Earth. As the Moon makes its way around the Earth, we see the bright parts of the Moon's surface at different angles. These are called 'phases' of the Moon.
It takes our Moon about 29.5 days to completely cycle through all eight phases. This is known as a Lunar month.
Hence, on the fifteenth day, it will be a full moon. Above is the diagrammatic representation.
State true or false.
The four inner most planets of solar system are made of rocks and
have metallic cores.
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True
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False
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Ambiguous
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Data Insufficient
Explanation
There are four rocky, or terrestrial, planets: Mercury, Venus, Earth, and Mars.These are also the four inner most planets of solar system. These planets are called terrestrial planets because they are made up of rocks and metals and have solid surfaces.Their cores are mostly made of metals.
The change in seasons on the Earth occurs because
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the distance between the Earth and the Sun is not constant.
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the axis of rotation of the Earth is parallel to the plane of its orbit.
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the axis of rotation of the Earth is perpendicular to the plane of its orbit.
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the axis of rotation of the Earth is tilted with respect to the plane of its orbit.
Explanation
We have seasons because the Earth is tilted as it makes its yearly journey around the Sun.
The Earth's axis is tilted at an angle of $$23.5^o$$. This means that the Earth is always pointing to one side as it goes around the Sun. So, sometimes the Sun is in the direction that the Earth is pointing, but not at other times. The varying amounts of sunlight around the Earth during the year, creates the seasons. The tilt of the Earth's axis is the most important reason why seasons occur.
The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later. In between these, Spring and Autumn will occur.
Hence, the seasons occurs because
the axis of rotation of the Earth is tilted with respect to the plane of its orbit.
Which of the following statement/s is/are correct about the planet Neptune?
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It is the outermost planet of solar system.
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It has moons.
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It has no life.
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All of the above.
Explanation
Neptune is the eighth planet from the Sun and is the most distant planet from the Sun. The atmosphere of Neptune is made of hydrogen and helium, with some methane. It does not contain oxygen, hence life cannot exist there. Neptune has 14 moons.
Hence, all the options are correct.
As per modern classification of solar system, number of planets excluding Earth is:
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$$7$$
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$$8$$
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$$9$$
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$$10$$
Explanation
There are eight planets in the solar system. The four inner terrestrial planets are Mercury, Venus, Earth, and Mars, all of which consist mainly of rock. The four outer planets are Jupiter, Saturn, Neptune, and Uranus, giant planets that consist mainly of either gases or ice.
Thus, as per the modern classification of the solar system, number of planets excluding Earth is 7.
In which direction from $$\beta$$ Saptarish (or Ursa Major or Great Bear) shown in the figure, do we search for Pole star?
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$$\alpha$$ to $$\beta$$
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$$\gamma$$ to $$\delta$$
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$$\beta$$ to $$\alpha$$
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$$\delta$$ to $$\gamma$$
Explanation
Let α,β are the pointer stars in Ursa Major
The stars, Merak ( Ursae Majoris) and Dubhe ( Ursae Majoris) are known as the "pointer stars" since they are useful for discovering Polaris, otherwise called the North Star or Pole Star. Let r be a Great Bear since The term Great Bear can allude to Ursa Major, the group of stars, whose name is the Latin for "Incredible Bear" Great Bear Lake, the biggest lake in the Northwest Territories of Canada and the fourth biggest in North America. Also, r Great Bear and proceeding on a line from to that shows genuine north and focuses and towards Polaris (the polestar or North Star, a star of the subsequent extent arranged near the north pole of the sky, in the heavenly body Ursa Minor.) or the North Star. The stars η α and β are the pointer stars in Ursa Major Great Bear r and proceeding on a line from α to β shows genuine north and focuses towards Polaris or the North Star.
Hence the answer is (A).
Stars, in a constellation form:
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no shape
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any arbitrary shape
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a recognisable shape
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a straight line always
Explanation
A constellation is a group of stars that, when seen from Earth, form a pattern or a recognisable shape.
A group of a few stars, whose arrangement can be compared to the figure of some kind of animal or any other known thing, is called a ________.
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Nebula
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Constellation
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Pluto
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Stellar
Explanation
Constellations are groups of stars that appear to form recognizable shapes. A constellation is a group of stars that, when seen from Earth, form a pattern of some kind of animal or any other known object.
W
hat is the cause for a meteor to burn up on entering the Earth's atmosphere?
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Atmospheric pressure
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Heat of the earth
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Solar radiation of heat
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Excessive friction
Explanation
A meteor is usually a small object that occasionally enters the earth’s atmosphere. At that time it has a very high speed. The friction due to the atmosphere heats it up. It glows and evaporates quickly. That is why the bright steak lasts for a very short time.
It takes Earth one year to orbit the sun.
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True
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False
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Ambiguous
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Data Insufficient
Explanation
The movement of the earth around the sun in a fixed path or orbit is called Revolution. It takes Earth one year ($$365$$ days) to orbit the sun.
Which factor is most directly responsible for determining
how often a full moon appears?
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The size of the moon
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The size of earth
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How quickly the moon orbits the earth
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How quickly the moon turns on its axis
Explanation
A full moon occurs when the moon moves in its orbit such that the earth is in between the moon and the sun. Therefore how often a full moon appears depends on how quickly the moon orbits the earth.
Mercury is closer to the Sun than the Venus. But Venus is hotter than Mercury. This is because
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Mercury has no atmosphere and Venus has a thick atmosphere which can retain the heat.
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Mercury is mostly made up of sedimentary rocks while Venus contains igneous rocks.
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Mercury being closer to the Sun, Sun absorbs the heat of the Mercury.
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All of the above are true.
Explanation
Venus is hotter
due to the greenhouse effect:
Venus
has an atmosphere about ninety times thicker
than
that of Earth, and made almost entirely of carbon dioxide, which is one of the gasses that causes the greenhouse effect on Earth. On the other hand,
Mercury's atmosphere
contains small amounts of hydrogen, helium, and oxygen. So, the heat received can be emitted as well. This is the reason why Venus is hotter than Mercury.
Pole star always appears stationary to a person
standing on Earth because
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Pole star always lies above the person in perpendicular position.
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Axis of Earth's rotation always passes through Pole star.
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Pole star remains fixed.
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Relative velocity of earth and pole star is zero.
Explanation
The sky above Earth appears to rotate because of the rotation of the Earth. The apparent fixed stars go East to West as the Earth rotates West to East. But since the axis of rotation of Earth passes through pole star, it is that point about which the sky rotates and hence the pole star appears fixed.
Astronomers use constellations to
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Locate objects in the sky
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Calculate the distances of objects
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Calculate the masses of objects
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None of the above
Explanation
Constellation, in astronomy, is any of certain groupings of stars that were imagined to form conspicuous configurations of objects or creatures in the sky. Constellations are useful in assisting astronomers and navigators to locate certain stars.Other objects in sky are located with reference to these constellations.
Which of these appears in the earth's atmosphere?
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A moon
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A meteor
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An asteroid
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A comet
Explanation
A meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust.
Which unit is usually used to describe the distances
of stars?
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Astronomical units
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Light years
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Kilometers
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Miles
Explanation
Light year is the distance travelled by light in one year. Light year is usually used to describe the distances of stars.
Choose correct option to fill the blank.
The phase of the moon in which the whole disc of the moon is visible is known as the _________phase.
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Full moon
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Half moon
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Both A & B
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-Non of these
Explanation
A full Moon occurs when the Moon has moved in its orbit so that Earth is “between” the Moon and the Sun. In full moon phase , the whole disc of the moon is visible.Hence it is called full moon phase.
Phases of the moon occur because
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We can see only that part of the moon that reflects light towards us.
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Our distance from the moon keeps changing.
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The shadow of the Earth covers only a part of the moon's surface.
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The thickness of the moon's atmosphere is not constant.
Explanation
Since we know that moon does not have it's own light but it reflects light coming from sun.So as the Moon orbits around the Earth, the part of the Moon that faces the Sun will be lit up. So we can only see that part of moon which is lit up by sun.Shape of lit part depends on relative location of sun,earth and moon.Thus the different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon.
On which planet would you see the sun rise in the west and set in the east?
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Mars
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Venus
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Mercury
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Neptune
Explanation
If viewed from above, Venus rotates on its axis from east to west that's the opposite of most planets'. That means on Venus, the sun would appear to rise in the west and set in the east. On Earth, the sun appears to rise in the east and set in the west.Because earth rotates from west to east.
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