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S1 Our Universe Module Exam

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Question 1 (Multiple Choice Worth 2 points)

[OU.03]A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth?

measure the parallax and use it in calculations

measure the red shift of emitted light and use it in calculations

use doppler effect to calculate the shift in light traveling from star to Earth in winter

use doppler effect to calculate the shift in light traveling from star to Earth in summer

Question 2 (Multiple Choice Worth 2 points)

[OU.04]The Big Bang Theory is accepted at present as the best explanation of the development of the universe over time. Which of these statements is correct about this theory?

It will remain unchanged in the future.

It may change due to new scientific evidences.

It will be proved invalid by scientific investigation.

It may have been tested by only one group of scientists.

Question 3 (Multiple Choice Worth 2 points)

[OU.04]Two groups of scientists got different results while studying about the expansion of the universe. What do the two results most likely indicate?

the ideas of both groups of scientists are invalid

all scientists do not have access to equally accurate data

there are several testable ideas to describe the origin of the universe

it is impossible to have a single acceptable theory about the universe

Question 4 (Multiple Choice Worth 2 points)

[OU.01]The picture below shows the position of Earth and two stars. Star 2 is 52 light years from Earth and 18 light years from Star 1. If Star 1 explodes as a supernova, in how many years would the explosion be seen from Earth?

18

34

52

70

Question 5 (Multiple Choice Worth 2 points)

[OU.03]Which of these is the best method to estimate the speed at which a star is moving away from Earth?

measure the star's red shift

measure the star's blue shift

calculate the parallax due to changes in Earth's position

calculate the pitch due to changes in frequency of light

Question 6 (Multiple Choice Worth 2 points)

[OU.03]Which of these properties of a star best determines its life cycle?

brightness

mass

density

temperature

Question 7 (Multiple Choice Worth 2 points)

[OU.01]Infrared radiations are produced when a changing electric field creates a

longitudinal wave parallel to it

longitudinal wave perpendicular to it

changing magnetic field parallel to it

changing magnetic field perpendicular to it

Question 8 (Multiple Choice Worth 2 points)

[OU.01]Which of these statements is correct for light waves?

It does not travel through water.

It does not travel through vacuum.

It travels fastest through vacuum.

It travels fastest through water.

Question 9 (Multiple Choice Worth 2 points)

[OU.04]The COBE mission and WMAP mission provide evidence to support the

Hubble's Law

Big Bang Theory

Steady State Theory

Doppler Effect

Question 10 (Multiple Choice Worth 2 points)

[OU.02]X-rays cannot pass through Earth's atmosphere. Which of these is the best location to place a telescope used to observe x-rays from stars?

high-flying aircraft

top of building

mountain

space

Question 11 (Multiple Choice Worth 2 points)

[OU.04]Based on an experiment, a cosmologist has proposed a new theory to explain the origin of the universe. The theory will be accepted when

its results match with the Big Bang Theory

the experiment gives different data every time it is repeated

its results are repeated and verified by scientists worldwide

the experiment rejects all old theories on the origin of the universe

Question 12 (Multiple Choice Worth 2 points)

[OU.04]Two stars, Star 1 and Star 2, are at almost equal distances from Earth. The table below shows the masses of the two stars.

Which of these statements is most likely correct about the stars?

Earth exerts almost equal gravitation force on both the stars.

Earth exerts greater gravitation force on Star 2 than on Star 1.

Star 1 attracts Star 2 with a greater gravitational force than Star 2 attracts Star 1.

Star 2 attracts Star 1 with a greater gravitational force than Star 1 attracts Star 2.

Question 13 (Multiple Choice Worth 2 points)

[OU.03]The pictures below show the wavelengths and intensities of electromagnetic radiations emitted by three stars, Star 1, Star 2, and Star 3. Which of these is most likely to happen if Star 2 becomes cooler?

its peak will rise higher than Star 1

its peak will rise higher than Star 3

it will look more like Star 3

it will look more like Star 1

Question 14 (Multiple Choice Worth 2 points)

[OU.02] NASA's space shuttle program in Florida will end in 2011. Which of these would be the most likely outcome of this event on the locations near the space center?

increase in number of restaurants and decrease in unemployment

increase in tourism and decrease in use of space technologies in homes

increase in unemployment and decrease in profit made by local businesses

increase in profit made by construction companies and decrease in use of space technologies in homes

Question 15 (Multiple Choice Worth 2 points)

[OU.01]The diagram below shows the distance traveled by two light waves in 1 second. Based on the diagram, which of these conclusions is correct about the two waves?

They have equal frequencies.

They have equal wavelengths.

The amplitude of Wave 2 is double the amplitude of Wave 1.

The frequency of Wave 2 is double the frequency of Wave 1.

Question 16 (Multiple Choice Worth 2 points)

[OU.04]The table below compares three galaxies.

The information about galaxies is correct only in

Column 1

Column 2

Column 1 and Column 3

Column 2 and Column 3

Question 17 (Multiple Choice Worth 2 points)

[OU.04]The picture below shows a galaxy with an elongated center. © NASA What type of galaxy is shown in the picture?

spiral

elliptical

irregular

barred spiral

Question 18 (Multiple Choice Worth 2 points)

[OU.01]One scientist is using an electromagnetic wave to map the dust between stars. The electromagnetic wave has shorter wavelength than radio waves but longer wavelength than visible light. What electromagnetic wave is the scientist using?

X-ray

Infrared light

Gamma ray

Ultraviolet radiation

Question 19 (Multiple Choice Worth 2 points)

[OU.03]The table below shows the initial masses of four stars.

Which of these stars will stay on the main sequence for the longest time?

Star 1

Star 2

Star 3

Star 4

Question 20 (Multiple Choice Worth 2 points)

[OU.01]Which of these waves has the greatest wavelength?

Question 21 (Multiple Choice Worth 2 points)

[OU.04]Which of these models would best represent the Big Bang Theory?

burst an inflated balloon with a pin

blow a balloon with spots marked on it

press a piece of raisin bread in the palm

keep a raisin bread in the open for a week

Question 22 (Essay Worth 3 points)

[OU.02] In your own words, explain why the period between 1960 and 1969 is regarded as the busiest period in space exploration history. What are two technological advancements or discoveries from this time period?

Question 23 (Essay Worth 3 points)

[OU.04] In your own words, explain how the Doppler Effect led to the development of the Big Bang Theory.

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