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21
Which planet takes 88 days to complete one round along its orbit?
A. Mercury
B. Jupiter
C. Saturn
D. Venus
Answer - A
Solution
Points to Know-
• Mercury is closest planet to the sun
• It is the smallest planet in solar system
• Time taken by Mercury to orbit the Sun is 88 days
• It can be seen only in morning and evening twilight.
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22
Which of the following things are part of solar system?
i. Planets
ii. Asteroids
iii. Comets
iv. Satellites
A. Only i
B. Only i, iii and iv
C. Only i, ii and iii
D. All of the above
Answer - D
Solution
Points to Know-
Consists of sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids. Also called a solar family with the Sun as its Head.
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23
Why only one side of the moon is visible from the earth?
A. Its rotation is faster than its revolution
B. Its period of rotation and revolution are same
C. It takes moon one light year to complete one spin
D. Other side of the moon is towards the earth only during day time
Answer - B
Solution
Points to Know-
Moon moves around Earth in about 27 days
Only one side of the moon is visible to us because it takes almost the same time to complete one spin.
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24
Which of the following is true?
i. Sedimentary rocks are primary rocks
ii. Sedimentary rocks contain fossils of plants and animals
iii. Sandstone is an example of sedimentary rock
A. Only i and ii
B. Only i and iii
C. Only ii and iii
D. All of the above
Answer - C
Solution
Points to Know-
• Igneous rocks are primary rocks
• igneous rocks are broken down into small particles that are transported and deposited to form sedimentary rocks
• These rocks may also contain fossils of plants, animals and other microorganisms that once lived on them.
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25
. Metamorphic rocks originate from-
A. Igneous rocks
B. Sedimentary rocks
C. Both A and B
D. None of these
Answer - C
Solution
Points to Know-
• Igneous and sedimentary rocks can change into metamorphic rocks under great heat and pressure
• Example – clay changes into slate and limestone into marble
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26
Marble is metamorphized form of-
A. Clay
B. Basalt
C. Limestone
D. Sandstone
Answer - C
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27
What is false regarding North Star?
A. It indicates north direction
B. Another name uses for it is Big Bear
C. It always remains in the same position
D. With the help of Saptrishi, we can locate its position
Answer - B
Solution
Points to Know-
• Big Bear is a constellation
• Another name for North Star is Pole star
• North star indicates the north direction
• It always remains in the same position in the sky. So can locate the position of the Pole Star with the help of the Saptarishi.
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28
What is the ultimate source of light and heat for the solar system?
A. Moon
B. Sun
C. Stars
D. Planets
Answer - B
Solution
Points to Know-
• Sun is the head of the solar family
• It is a huge star
• Its pulling force binds the solar system
• It is ultimate source of heat and light for the solar system
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29
Which is the largest inner planet?
A. Jupiter
B. Saturn
C. Mars
D. Earth
Answer - D
Solution
Points to Know-
• Inner planets- Mercury, Venus, Earth and Mars
• They are very close to sun
• They are made up of rocks and known as terrestrial planets
• Earth is largest inner planet
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30
Which of the following planets have rings around them?
i. Jupiter
ii. Saturn
iii. Venus
iv. Neptune
A. Only i, ii and iii
B. Only i, ii and iv
C. Only ii and iv
D. All of the above
Answer - B
Solution
Points to Know-
• Outer planets- Jupiter, Saturn, Uranus, Neptune
• They are very-very far from the sun
• They are made up of gases and liquids and Known as Gaseous planets
• They have rings around them
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