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Physics for IGCSE & O level - The Earth In Space (Section 13)

1
What does 'orbit' mean?
Answer
(B)
To travel around another object
2
What type of objects orbit the Sun?
Answer
(D)
All of the above
3
What is the shape of comets' orbits?
Answer
(B)
Elliptical
4
What term is used to describe a large, rotating cloud of gas and dust?
Answer
(A)
Nebula
5
What is the primary factor that determines a star's life cycle?
Answer
(B)
Its size
6
What is one piece of evidence supporting the expansion of the universe?
Answer
(C)
Red shift of light from distant galaxies
7
Which celestial body orbits the Earth?
Answer
(B)
Moon
8
What does the Earth's rotation cause?
Answer
(C)
Day and night
9
Which of these is the farthest planet from the Sun?
Answer
(B)
Neptune
10
What is a nebula?
Answer
(B)
A cloud of gas and dust in space
11
What is meant by the term 'redshift'?
Answer
(B)
Light from objects moving away is shifted towards the red end of the spectrum.
12
What is the path of an object as it travels around another object?
Answer
(B)
Revolution
13
Which of these is NOT considered an inner planet?
Answer
(C)
Jupiter
14
Which of the following are outer planets?
Answer
C
D
15
What is the force that keeps objects in orbit?
Answer
(B)
Gravity
16
What is the distance from the Sun to the Earth in astronomical units (AU)?
Answer
(B)
1 AU
17
What is the unit used to measure distance to stars?
Answer
(C)
Light-years
18
What are the phases of the moon caused by?
Answer
(C)
The changing angles at which we see the Moon's illuminated surface
19
What is an AU (astronomical unit) equal to?
Answer
(B)
The distance between the Earth and the Sun
20
What do we call a celestial body that orbits a planet?
Answer
(B)
Moon/Satellite
21
How long does it take for the Earth to orbit the Sun?
Answer
(C)
1 year
22
What is the name of the first planet closest to the Sun?
Answer
(C)
Mercury
23
What is the definition of a light-year?
Answer
(B)
The distance light travels in one Earth year.
24
What is a 'light-year' used to measure?
Answer
(C)
Distance
25
Which planet is sometimes referred to as the 'morning star' or 'evening star'?
Answer
(B)
Venus
26
What is a common characteristic of all planets that orbit the Sun?
Answer
(B)
They orbit in the same plane.