QUESTION 15 Approximately how far is it from one side of the Milky Way Galaxy to

Question

QUESTION 15

Approximately how far is it from one side of the Milky Way Galaxy to the other side?

1,000,000 light-years

100,000 light-years

10,000 light-years

1,000 light-years

4 points   

QUESTION 16

When we see a galaxy moving towards us and emitting a ray of light in the green part of the spectrum, which of the following colors is the one that we would most likely see?

Yellow

Blue

Red

Green

4 points   

QUESTION 17

As a nebular cloud collapses into a planetary system, mass is:

uniformly distributed throughout the volume.

mostly contained in the center of the cloud.

mostly distributed along the outer rim of the cloud.

distributed in a wave-like pattern throughout the cloud.

4 points   

QUESTION 18

Which of the following parts of a typical planet would we expect to have the lowest density?

Outer core

Inner core

Crust

Mantle

4 points   

QUESTION 19

Which of the following is typically not a way that a mountain can change in size?

Water erosion

Wind erosion

Volcanic eruption

Mountains can change in size through each of these methods.

4 points   

QUESTION 20

The speed of a seismic wave:

fluctuates slightly, and is on average several of tens of meters per second.

does not fluctuate, and is on the order of thousands of meters per second.

does not fluctuate, and is on the order of hundreds of meters per second.

fluctuates wildly, depending upon the type of rock through which it travels.

4 points   

QUESTION 21

The Earth’s major cycles are predominantly driven by which of the following?

The tendency of heat to diffuse

Gravitational attraction

Nuclear reactions within the Earth

Chemical reactions

4 points   

QUESTION 22

Of all the water on Earth, __________ percent is salty and __________ percent is available for human use.

97.5; 10

75.9; 100

97.5; 1

100; 79.5

4 points   

QUESTION 23

Wind patterns in the world tend to be like which of the following?

Winds are arranged in bands running north to south.

Winds flow from the equator to the poles.

Winds flow from the poles to the equator.

Winds are arranged in bands running east to west.

4 points   

QUESTION 24

A system in homeostasis experiences which of the following?

Stability in the day-to-day changes in moisture

Stability in the types of species present

Stability in the number of organisms present

Stability in the rate of extinction

4 points   

QUESTION 25

Which of the following accurately summarize the Law of Unintended Consequences?

Changing one aspect of a complex system will typically cause exactly the opposite thing to happen in another part of the system.

Changing one aspect of a complex system will typically cause exactly the same thing to happen to a surprising number of other parts of the system.

Changing one aspect of a complex system will typically cause several other parts of the system to change in exactly the right way to counteract the original change.

Changing one aspect of a complex system will typically cause wholly unforeseen changes in a

1,000,000 light-years

100,000 light-years

10,000 light-years

1,000 light-years

Explanation / Answer

15:- A- 100,000 light year
16: A- Yello Any star or galaxy emitting mostly green will be putting out lots of red and blue as well,resulting in mix up of those colours to produce one color: Yello
17: B- mostely contained in the centre of the cloud. As the collapse continues, density increases and the molecules inside begin to interact more and more. This extra interaction causes the temperature to increase. Since pressure depends on density and temperature,hense the pressure increases which results in increase in concentration of mass in the centre.
18: C- Crust

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