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8th Grade > Physics

STARS AND THE SOLAR SYSTEM MCQs

Total Questions : 56 | Page 1 of 6 pages
Question 1. The size of moon _________  after full moon.
  1.    increases
  2.    decreases
  3.    remains same
  4.    may increase or decrease
 Discuss Question
Answer: Option B. -> decreases
:
B
The size of moon decreases progressively after the full moon day, till the point it disappears completely on the new moon day. After that, it starts to increase again.
Question 2. After a new moon day, the visible part of the moon 
  1.    becomes thinner
  2.    grows in size
  3.    remains same for a week
  4.    may increase or decrease
 Discuss Question
Answer: Option B. -> grows in size
:
B
The day on which no region of the moon is visible is called as a new moon day. The next day, only a small portion of the moon is visible in the sky. This is known as the crescent moon. Thereafter, every night the size of the visible part of the moon grows larger.
Question 3. How long does it take for light from the sun to reach Earth?
  1.    1 minute
  2.    5 min
  3.    8 minutes
  4.    24 hours
 Discuss Question
Answer: Option C. -> 8 minutes
:
C
Light travel at 300000 km per secondand the distance between Earth and the Sun is 150 million km. It takes nearly 8 minutes for the light to reach Earth.
Question 4. The large gap between the orbits of Mars and Jupiter is occupied by a large number of small objects that revolve around the Sun. What are these small objects called?
  1.    Meteorites
  2.    Asteroids
  3.    Comets
  4.    Satellites
 Discuss Question
Answer: Option B. -> Asteroids
:
B
There is large space between the orbits of the planets Mars and Jupiter. A large number of small objects occupy this space revolving around the Sun. These objects are calledasteroids. The collection of asteroids in that region is called the asteroid belt.
Question 5. Which planet's orbit will enclose more area?
  1.    Mercury
  2.    Neptune
  3.    Earth
  4.    Venus
 Discuss Question
Answer: Option B. -> Neptune
:
B
The area enclosed by an orbit depends on the distance of the planet from the sun. Larger the distance, larger the area enclosed. Among the given planets, Neptune is the farthest planet so will have the maximum area enclosed in its orbit.
Question 6. The study of celestial objects and the phenomena associated with them, is called ________.
  1.    astronomy
  2.    astrology
  3.    geography
  4.    seismography
 Discuss Question
Answer: Option A. -> astronomy
:
A
The study of celestial objects such as stars, planets, comets, galaxies and associated phenomena is called astronomy. It applies mathematics, physics, and chemistry in an effort to understand and thus explain the origin of these objects and their evolution, by understanding the underlying phenomena or principles.
Question 7. Which organisation was responsible for excluding Pluto from the Sun's planet list?
  1.    IAU
  2.    IUPAC
  3.    NASA
  4.    USA
 Discuss Question
Answer: Option A. -> IAU
:
A
In 2006, the International Astronomical Union (IAU) adopted a new definition of a planet such that Pluto doesnot fit this definition. Hence,it is no longer a planet of the solar system.
Question 8. If we begin to observe Earth from 1 January 2001, how many revolutions did Earth make around Sun until 1 January 2005?
  1.    1
  2.    2
  3.    4
  4.    5
 Discuss Question
Answer: Option C. -> 4
:
C
The Earth's completion of one revolution around the Sun requires one year. There are four full years between 1 January 2001 and 1 January 2005. The Earth has therefore completed four revolutions around the Sun.
Question 9. Wind blows faster on the Moon than on Earth.
  1.    True
  2.    False
  3.    Both the statements are correct
  4.    Both the statements are incorrect
 Discuss Question
Answer: Option B. -> False
:
B
There is no atmosphere on the Moon. Hence, there is no possibility of wind there.
Question 10. What is a light year?
  1.    It is the speed at which light travels for one year
  2.    It is the time taken by the light to reach the earth
  3.    It is the distance which the earth travels in one year
  4.    It is the distance which light travels in one year
 Discuss Question
Answer: Option D. -> It is the distance which light travels in one year
:
D
A light year is defined as the distance traveled by light in oneyear. For example ifa star is4 light years away from earth, it means that light from that starwill take 4 yearsto reachEarth.

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