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CBSE Questions for Class 8 Physics Stars And The Solar System Quiz 10 - MCQExams.com
CBSE
Class 8 Physics
Stars And The Solar System
Quiz 10
Phases of the Moon occur because:
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the thickness of the Moon's atmosphere is not constant
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the distance between the Earth and the Moon keeps changing
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we can see only that part of the Moon which is illuminated due to the Sun's light
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the shadow of the Earth covers only a part of the Moon's surface
Explanation
Moon does not have its own light. We can see Moon only because of the Sun's light that falls on it and is reflected towards the Earth. Hence, the different shapes of the lit portion of the moon that can be seen from the earth are known as phases of the moon.
Match the columns
$$A$$
$$B$$
(1) Stars
(a) Pollution free
(2) Objects in the sky
(b) Do not twinkle
(3) Planets
(c) Twinkling bodies
(4) Clear sky
(d) Celestial bodies
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1-c, 2-d, 3-b, 4-a
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1-d, 2-a, 3-c, 4-b
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1-b, 2-c, 3-a, 4-d
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1-c, 2-a, 3-d, 4-b
Explanation
$$(1)$$ Stars have their own light and are visible at night as twinkling bodies.
$$(2)$$ Objects in the sky are together known as celestial bodies.
$$(3)$$ Planets do not have their own light. They get light from the stars. Hence they do not twinkle.
$$(4)$$ When the sky is pollution-free it becomes more clear and it is easy to view the heavenly bodies.
The moon is a natural source of light. State whether true or false.
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True
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False
Explanation
The moon can only be seen as a result of the sunlights reflection. It does not produce any lights on its own.
Ans: False
Moon changes its phase. What kind of change it is?
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Non periodic change
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Chemical change
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Universal change
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Periodic change
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None of these
Which one of the following is a jovian planet?
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Earth
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Mars
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Saturn
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Venus
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None of these
Explanation
Jupiter, Saturn, Uranus, and Neptune collectively make up the group known as the Jovian planets. The general structures of the jovian planets are opposite those of the terrestrial planets.
The period between two consecutive new moon days is _______ and is called a _______.
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$$31$$ days, month
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$$7$$ days, week
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$$15$$ days, fortnight
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Slightly longer than $$29$$ days, month
Explanation
The time taken for one revolution of moon is a few hours longer than 29 days. But for ease of calculation, these hours have been divided amongst the months to give us months having 30 and 31 days. It takes one complete revolution of the moon around the Earth to have the next new moon day after the previous one. This period is called a month.
What occurs $$15$$ days after the full moon day?
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Half moon day
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Crescent moon day
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New moon day
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None of the above
Explanation
Every night after the full moon day, the size of the visible part of the Moon becomes thinner. It takes a period of 15 days for the Moon to become completely invisible. This day is called new moon day.
A group of stars which appear in clusters, is called a:
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asteroids
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Milky way
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constellation
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None of these
Explanation
A constellation is a group of stars
which appear in clusters,
that appears to form a pattern or picture in the sky.
So the correct answer is option C.
Which of the following Venn diagram correctly represents the relationship between the meteors and meteorites.
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0%
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None of these
Explanation
Meteors are solid that evaporates on entering the earth's atmosphere. If it survives on reaching the ground, it is called as meteorite. Hence we can say that meteorite is a meteor that doesn't get evaporated on reaching the earth's surface. Therefore, option (C) is correct and rest of the potions is incorrect.
The 3 middle stars in Orion represent the ________.
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Belt of the bear
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Belt of the hunter
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Tail of the bear
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Stick of the hunter
Explanation
Constellations were phrased by ancient people to enable easy recognition of stars. Constellations resemble objects that were familiar to those people. Orion resembles the hunter, and the 3 middle stars of the constellation represent the belt of the hunter.
Why can no sound be heard on the Moon?
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Highly dense atmosphere blocks the sound.
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There is no atmosphere on the Moon.
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Both A and B.
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None of the above.
Explanation
Sound requires a medium to travel. However, there is no atmosphere on Moon, i.e., there is no medium for sound to travel. Hence, no sound can be heard on the Moon.
Fill in the blank:
Ursa Major: _________ :: Orion: Hunter
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Big Dipper
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Leo Major
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Great Bear
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Saptarshi
Explanation
Orion, due to its appearance, is known as Hunter. Similarly, due to its appearance, Ursa Major is known as Great Bear.
Could Saturn float on water and why?
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Yes, because its density is less than the density of water.
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No, because its density is more than the density of water.
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Yes, because it is a celestial body.
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No, because it has rings.
Explanation
Saturn is the least dense planet. In fact, its density is less than water
because it is mostly made of gas and
hence, ideally it can float on water.
To which star do the following properties belong?
(a) It lies close to the axis of rotation of Earth.
(b) It is one of the brightest star in the sky
(c) All stars appear to revolve around it.
(d) It may not be visible from some points in the southern hemisphere.
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Sirius
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Alpha Centauri
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Pole star
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Regal
Explanation
Pole star lies close to the axis of rotation of the Earth. Hence it does not appear to move. However, since Earth rotates from West to East, all the other heavenly objects appear to be moving in the opposite direction, i.e., from East to West since the pole star also appears to be fixated in one place, it seems like the other stars revolve around it. It is one of the brightest star in the sky and can be seen almost every night. However, it cannot be seen from some points in the Southern hemisphere.
In which season, is Cassiopeia visible?
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Winter
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Summer
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Rainy
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All seasons
Explanation
Cassiopeia is visible in the northern sky during winter (somewhere around November )season early in the night.
Fill in the blanks.
In $$1609$$, _______ designed a telescope.
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Newton
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Galileo
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Einstein
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Archimedes
Explanation
In 1609, Galileo designed a telescope to view the celestial bodies.
He was the first man who did effective work on celestial objects.
The branch of science that deals with the study of universe is called:
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Anthropology
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Astronomy
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Geology
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Universe
Explanation
Astronomy is the branch of science that deals with the study of universe.
It deals with observation of celestial objects and study them.
In Indian astronomy planets are called:
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Objects
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Graha
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Budha
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Bodies
Distance between Earth and Moon is about:
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$$40,000\ km$$
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$$4,00,000\ km$$
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$$400\ km$$
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$$4 \times 10^8\ km$$
Explanation
Distance between Earth and Moon is about $$3,84,000\ km$$
which is aprrox $$4,00,000km$$
We study the properties of planets, formation of galaxies, the position of stars, etc. in the field of _________.
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Sociology
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Astronomy
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Geology
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History
Explanation
The study of celestial objects and associated phenomena is called astronomy. It is the study of the properties of planets, the formation of galaxies, the position of stars, etc.
Which of the following is a consequence of the fact that the rotation and revolution periods of the moon are the same?
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The moon keeps the same face turned toward the earth
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The moon can never be seen from one hemisphere of the earth
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All lunar phases can be seen from the earth
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There are about 12 months per year
Explanation
We are able to see only one side of the moon everytime because the time taken by the Moon to complete one rotation around its axis and the time taken by the Moon to complete one revolution around the Earth is the same. Such situation is known as synchronous rotation.
The largest planet of the solar system is:
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Mars
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Venus
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Jupiter
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Saturn
Explanation
Jupiter is the largest planet in the solar system. It is so large that about $$1300$$ earths can be placed inside this giant planet. However, the mass of Jupiter is about 318 times that of our Earth. It rotates very rapidly on its axis.
Phases of the moon occur because:
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We can see only that part of the moon which 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 moon's surface
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The thickness of the moon's atmosphere is not constant
Explanation
Phases of the moon occur because we can see only that part of the moon which reflects light towards us.
The changing shape of the bright part of the Moon that we see is called its phase.
The moon is illuminated because it reflects the light from the sun. The part of the moon facing the sun is lit up. The part facing away from the sun is in darkness.
Why is the Big Bang Theory the most accepted theory for how the universe was formed?
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It is the most simple explanation for the evidence we have
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Religion says its the best theory
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Science has proven it beyond doubt
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A small group of scientists said it was the best opinion
Explanation
Big Bang Theory is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now. It is the simplest explanation for the origin of the universe which scientists claim is still expanding.
According to scientists, the gigantic explosion by which the universe came into existence is called :
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Universal theory
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Solar system theory
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Milky way theory
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Big bang theory
Explanation
We know that the universe consists of stars and their respective planetary systems.
As per the Big Bang Theory, at the beginning of the universe, there was a huge mass of matter. This mass exploded and got broken up into millions of fragments. These fragments became stars. Some parts of these stars got detached from them and cooled down to form planets.
This is how the Universe was created.
The second biggest planet of the solar system has:
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lowest density
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density equal to water
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highest density
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density equal to earth
Explanation
Second biggest planet in the solar system is Saturn.
Saturn has the lowest density as it is mostly composed of gases.
Theory which proclaims that an explosion created universe is called the
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Law of gravity
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Big bang theory
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Darwin theory
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Earth theory
Saturn has specific gravity :
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Less than that of water
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Equal to that of water
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More than that of water
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None
Explanation
Specific Gravity of any object is defined as the ratio of its density to the density of water.
$$\text{Specific density} = \dfrac{ \text{ density of the object(Saturn) } }{ \text{density of water} }$$
Where,
$$\text{density}=\dfrac {\text{mass}}{\text{volume}}$$
Saturn is even lighter than water. This means its density is less than that of water. Hence its specific gravity is less than that of water.
The fascinating thing is that if Saturn falls on a large body of water, even larger than Saturn, then it will float on water.
By which poles of Mars are covered?
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Dry ice
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Water ice
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Nitrogen
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Iron
Explanation
Polar regions of Mars are covered by dry ice
i.e., Solidified Carbon-dioxide.
$$\therefore$$ Correct Option is A.
Last seen in 1986, which comet appears after
nearly every 76 years?
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Halley's
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Biela's
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Encke
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Kohoutek
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