CH 24 PRACTICE TEST

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CH 24 PRACTICE TEST
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MULTIPLE CHOICE
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• The electromagnetic spectrum is

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• all of the different types of electromagnetic
  waves

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• A range of colors formed when white light passes
  through a prism is called a .

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• spectrum

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• Both reflecting and refracting telescopes are
  designed to

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• gather and focus visible light

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• Reflecting telescopes differ from refracting
  telescopes in having

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• a mirror instead of an objective lens

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• Spectrographs help astronomers determine the

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• temperature of a star.

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• The chemical composition of a star can be
  determined using a(n)

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• spectrograph

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• A light-year is

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• the distance light travels in a year

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• Parallax is a method used to determine a stars..

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• distance from Earth

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• Stars are classified according to their

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• size, brightness, and temperature

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• What color are the hottest stars?

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• blue-white

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• A star is born when

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• nuclear fusion starts

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• All stars begin their lives as parts of

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• nebulas

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• The lifetime of a star depends on its

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• mass

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• Depending on its mass, a star may live from

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• 10 million to 200 billion years

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• A supernova is the explosion of a dying

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• giant or supergiant star

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• When stars begin to run out of fuel, they first
  become

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• red giants or supergiants

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• More than half of all stars are members of two or
  more stars called

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• star systems

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• Eclipsing binary stars can sometimes be
  identified because

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• they become dimmer at regular intervals

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• How are elliptical galaxies and spiral galaxies
  different?

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• Elliptical galaxies have almost no gas or dust.

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• The Milky Way Galaxy is a type of

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• spiral galaxy

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• One piece of evidence that supports the big bang
  theory is the observation that most galaxies are
  moving

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• away from each other

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• The theory that astronomers have developed to
  describe the formation of the universe is called
  the

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• big bang theory

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• The solar system formed from

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• a giant cloud of gas and dust

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• When the solar system formed, the spheres that
  lost most of their gases became the

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• inner planets

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• The brightness of a star depends on its

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• size and temperature

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• Scientists think that our universe is
  approximately

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• 10 to 15 billion years old

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• The Hertzsprung-Russell diagram shows that main
  sequence stars

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• increase in brightness as they increase in
  temperature.

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• The force that tends to pull together the matter
  in stars is

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• gravity

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• Black holes form from stars that

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• were more than 40 times the mass of our sun

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• One indication that a planet may exist near
  another star is that

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• the star has a very slight back and forth motion.

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• TRUE/FALSE

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• Radio waves are shorter than waves of visible
  light.

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• False/longer

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• A reflecting telescope uses a mirror to focus
  light onto a small area.

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• True

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• Most galaxies are moving away from each other,
  which means the universe is contracting.

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• False/ expanding

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• Astronomers measure distances to stars in units
  called kilometers.

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• False/ light years

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• The brightness of a star as seen from Earth is
  its apparent magnitude.

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• True

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• A star that has no fuel but glows faintly is a
  black dwarf.

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• False/ white

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• Stars with less mass will last longer than stars
  with more mass.

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• True

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• The solar system was formed after the Milky Way
  galaxy was formed.

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• True

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• A star system has at least three stars.

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• False/ two

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• The sun is part of an elliptical galaxy.

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• False/ spiral

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• Completion/ fill in the blank

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• The first object to form in our solar system when
  a nebula collapsed was the __________.

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• sun

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• The distance between the crest on one wave and
  the crest on the next wave is the waves ____.

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• wavelength.

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• Telescopes work by detecting forms of ______
• radiation.

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• electromagnetic

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• What happens to the universe in the future
  depends on the total force of gravity pulling the
  galaxies together, which depends on the total
  _____ of the universe.

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• mass

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• The brightness of a star would have if it were at
  a specific distance from Earth is the
  stars______
• magnitude.

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• absolute

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• The most massive stars collapse to form _____
  ______ when they die.

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• black holes

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• A(n) ________ galaxy has a characteristic
  pinwheel shape.

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• spiral

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• A spectrograph breaks the light from an object
  into a(n) __________, or range of different
  colors, and photographs it.

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• spectrum

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• All stars begin as part of a large amount of gas
  and dust called a(n) _________.

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• nebula

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• A protostar becomes a star when energy is
  released by the process of ______ _______.

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• nuclear fusion

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• The type of light humans can see is ______
• light.

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• visible

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• A device that detects radio waves from objects in
  space is called a(n) ________ telescope.

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• radio

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• Astronomers can determine the temperature of a
  star by using an instrument called a(n)______.

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• spectrograph

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• The apparent change in position of an object when
  viewed from two different places is called
  _________.

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• parallax

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• Astronomers use _______ magnitude to compare the
  brightness of stars.

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• absolute

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• The length of a stars life is determined by its
  ____.

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• mass

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• A dying giant star can suddenly explode, becoming
  a(n) _________.

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• supernova

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• Astronomers can detect a binary star system
  called a(n) ______ ______ when one star dims and
  brightens.

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• eclipsing binary

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• A galaxy that does not have a regular shape is
  classified as a(n) _________ galaxy.

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• irregular

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• According to the big bang theory, the universe
  formed about _______________________
• years ago.

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• 10 to 15 billion

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• THE END!!!!!