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20-1
Test Description: 20-1
Instructions: Answer all questions to get your test result.
1) What is a star?
A
Huge mass of dust and gas undergoing nuclear fusion
B
Large shiny thing
C
Celestial object
D
Black hole
2) How are constellations used?
A
To group planets together
B
To group stars together
C
For entertainment purposes
D
To determine shapes in the sky
3) What is the definition of a light year?
A
The distance it takes for light to travel to Earth
B
A character off of Toy Story
C
Unit to describe how far away a star is from Earth
D
The distance it takes for light to travel in one year
4) How far is a light year?
A
8.8x10^4 m
B
1.4x10^18 m
C
9.5x10^15 m
D
7.6x10^12 m
5) What are stars held together by?
A
Solar flares
B
Planetesimal influences
C
Gravity
D
Newton's 1st Law
6) What is nuclear fusion
A
Hydrogen is converted into helium releasing energy
B
Helium is converted into hydrogen releasing energy
C
Hydrogen is converted into iron releasing energy
D
Helium is converted into iron releasing energy
7) By what two methods does energy move through the layers of a star?
A
Convection and radiation
B
Conduction and radiation
C
Conduction and convection
D
Radiation and conduction
8) What is convection?
A
Rising hot gas moves upward and cooler denser gas sinks to the center
B
Cooler denser gas moves upward and rising hot gas sinks to the center
9) Describe radiation
A
Energy is contained in one atom
B
Energy is used
C
Energy is neither created nor destroyed
D
Energy is transferred to individual atoms
10) How long does it take energy to move through the layers of stars?
A
Billions of years
B
1 year
C
Millions of years
D
10 years
*select an answer for all questions
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