Question 1

How does sonar detect an object in water?

Accepted Answer

by sending sound waves that reflect off the object

Answer

by sending sound waves to detect the composition of the object

Answer

by sending sound waves that measure the object's temperature

Answer

by sending sound waves  that are absorbed by the object

Question 2

Which causes an object to appear green?

Accepted Answer

While absorbing all the other colors in the visible spectrum, it reflects green

Answer

While scattering all the other colors in the visible spectrum, it reflects green.

Answer

While reflecting all  the other colors in the visible spectrum, it scatters green.

Answer

While reflecting all the other colors in the visible spectrum, it absorbs green.

Question 3

How do foam earplugs affect the sound a person hears?

Accepted Answer

The foam reduces the amount of energy in the sound vibrations.

Answer

The foam reduces the rate of sound vibrations.

Answer

The foam increases the rate of sound vibrations.

Answer

The foam increases the amount of energy in the sound vibrations.

Question 4

Some earthquakes cause the ground to shake more than others.  What factor in an earthquake's wave causes a greater shaking of the ground?

Accepted Answer

larger amplitude

Answer

less energy

Answer

lower frequency

Answer

slower speed

Question 5

Which statement best describes white light after it passes through a prism?

Accepted Answer

The white light is a combination of all wavelengths of the visible spectrum.

Answer

The white light contains ultraviolet energy.

Answer

The white light has no electromagnetic energy.

Answer

The white light is a combination of the wavelengths of red and blue.

Question 6

Why are humans unable to hear ultrasound waves?

Accepted Answer

Ultrasound waves have a higher frequency than humans can hear.

Answer

Ultrasound waves do not have energy when traveling.

Answer

Ultrasound waves do not cause matter to vibrate.

Answer

Ultrasound waves have a larger amplitude than humans can hear.

Question 7

Sam found two pieces of pure silver on two different continents and melted them.  Why did the two pieces of pure silver have the same melting point?

Accepted Answer

Silver is composed of the same types of atoms.

Answer

The melting point of all natural minerals is the same.

Answer

The melting point of all metals is the same.

Answer

Silver is a metal with high conductivity.

Question 8

What happens to steam during condensation?

Accepted Answer

It loses energy and changes to a liquid.

Answer

It gains energy and changes to a gas.

Answer

It loses energy and changes to a gas.

Answer

It gains energy and changes to a liquid.

Question 9

What is the best way to determine if a sample is pure gold?

Accepted Answer

compare the melting point of the sample with a sample of pure gold

Answer

compare the color of the sample with a sample of pure gold

Answer

compare the luster of the sample with a sample of pure gold

Answer

compare the volume of the sample with a sample of pure gold

Question 10

Two pieces of copper wire are rolled into a coil to make a bracelet.  Which statement describes the copper wire?

Accepted Answer

Both copper wires are made of the same types of atoms.

Answer

Both copper wires are made of different types of atoms.

Answer

Both copper wires are the same because they were able to bend.

Answer

Both copper wires are different because they came from different sources.

Question 11

What change occurs when a liquid evaporates?

Accepted Answer

The particles absorb heat and spread farther apart.

Answer

The particles absorb heat and get closer together.

Answer

The particles release heat and get closer together.

Answer

The particles release heat and spread farther apart.

Question 12

Two identical beakers containing water, which have not yet been placed in the sun,  have different volumes of water.  Beaker "Y" has more water than beaker "X".  If both beakers are placed outside, in the sun, for the same amount of time, what effect will the sun have on the water in each beaker?

Accepted Answer

The water in beaker "X" will heat faster because the volume of the water is lower.

Answer

The water in beaker "X" will heat faster because the density of the water is lower.

Answer

The water in beaker "Y" will heat faster because the density of the water is greater.

Answer

The water in beaker "Y" will heat faster because the volume of the water is greater.

Question 13

What will initially happen when a metal rod with a temperature of 60 degrees Celsius is placed into a 5 degree Celsius water bath?

Accepted Answer

Heat will travel out of the metal rod and into the water.

Answer

The temperature of the metal rod and the water will both decrease.

Answer

Heat will travel out of the water and into the metal rod.

Answer

The temperature of the metal rod and the water will both increase.

Question 14

How does a 5-g sample of pure gold compare to a 50-g sample of pure gold?

Accepted Answer

They have the same melting point but different masses.

Answer

They have the same volume but different melting points.

Answer

They have the same mass but different boiling points.

Answer

They have the same volume but different boiling points.

Question 15

Lin notices that the temperature of the room increases when the afternoon sun shines through the window.  She experiments by covering the window using four different materials to find out which works best to reduce the temperature of the room.  Which material works best?

Accepted Answer

aluminum foil, because it reflects light

Answer

black paper, because if reflects light

Answer

white paper, because it absorbs light

Answer

newspaper, because it absorbs light

Question 16

People who work on electrical power lines wear thick rubber gloves.  Why are their gloves made of rubber?

Accepted Answer

Rubber does not conduct electricity.

Answer

Rubber conducts electricity.

Answer

Rubber does not conduct heat.

Answer

Rubber conducts heat.

Question 17

An arrangement of the Earth, moon and sun are shown to show a new moon.  What effect does this arrangement have on the tidal range?

Accepted Answer

The tide is larger than normal because the gravitational forces of the sun and moon pull in the same direction.

Answer

The tide is smaller than normal because the gravitational forces of the sun and moon pull in opposite directions.

Answer

The tide is larger than normal because the gravitational forces of the sun and moon pull in opposite directions.

Answer

The tide is smaller than normal because the gravitational forces of the sun and moon pull in the same direction.

Question 18

Why is the distance between Earth and the sun most important?

Accepted Answer

The distance contributes to Earth's ability to support life.

Answer

The distance causes the different seasons on Earth.

Answer

The distance prevents solar flares from reaching Earth's atmosphere.

Answer

The distance is the source of Earth's magnetic field.

Question 19

As planets revolve around distant stars, they block some of the light from reaching the Kepler space telescope.  The telescope measures changes in the brightness of stars as planets move in front of them.  How has the Kepler telescope improved our understanding of the universe?

Accepted Answer

It has aided in the discovery of planets outside the solar system.

Answer

It has aided in the discovery of life inside the solar system.

Answer

It has aided in the discovery of planets inside the solar system.

Answer

It has aided in the discovery of life outside the solar system.

Question 20

What causes the summer to be the warmest season?

Accepted Answer

The Earth's tilt causes the longest days with the most intense sunlight.

Answer

The Earth's tilt causes the shortest days with the most intense sunlight.

Answer

The Earth's tilt causes the longest days with the least intense sunlight.

Answer

The Earth's tilt causes the shortest days with the least intense sunlight.

Question 21

Which best describes Earth's crust?

Accepted Answer

It is composed of several continental plates.

Answer

It is the thickest layer of Earth.

Answer

It is more dense than the other layers of Earth.

Answer

It contains layers of stationary rock.

Question 22

Which most likely causes seafloor spreading?

Accepted Answer

divergent boundaries

Answer

convergent boundaries

Answer

transform fault boundaries

Answer

earthquakes

Question 23

Which statement best explains the role of environmental conditions in the formation of soil.

Accepted Answer

The rocks and climate of an area determine the type of soil.

Answer

Areas with high temperatures produce soil at  a faster rate.

Answer

The number of organisms living in the soil determine its type.

Answer

Areas near fresh or salt water produce wet, sandy soil.

Question 24

Which best describes the density of Earth's layers?

Accepted Answer

The inner core is the most dense because it is under the most pressure.

Answer

The outer core is the most dense because it is the only liquid layer.

Answer

The crust is the most dense because it is the top layer.

Answer

The mantle it the most dense because it is the thickest layer.

Question 25

What process is responsible for the Atlantic Ocean becoming wider by a few centimeters each year?

Accepted Answer

seafloor spreading along the Mid-Atlantic Ridge

Answer

the edges of the continents are subsiding

Answer

one plate moving under the other plate

Answer

two plates meeting at a transform boundary

Question 26

Which type of environment would contain nutrient-rich soil?

Accepted Answer

an environment with a wet climate and many plants

Answer

an environment with a high population of consumers

Answer

an environment with a low population of producers

Answer

an environment with a dry climate and few plants

Question 27

Which choice describes Earth's crust?

Accepted Answer

a thin layer of rock floating on a solid but fluid-like layer

Answer

a thick layer of rock floating on liquid metal

Answer

a group of continents floating on a large ocean

Answer

a warm layer of rock floating on a cold layer of rock

Question 28

What would occur if  the anther were removed from a flower?

Accepted Answer

The flower would be unable to produce pollen.

Answer

The flower would be unable to collect water.

Answer

The flower would be unable to produce fruit.

Answer

The flower would be unable to collect seeds.

Question 29

Why is photosynthesis important to the survival of green plants?

Accepted Answer

because it provides the energy and food necessary for growth

Answer

because it provides oxygen for other living things on Earth

Answer

because it helps provide water that is necessary for life

Answer

because it helps absorb energy from the soil

Question 30

How do some plants defend themselves against predators?

Accepted Answer

Plants can have thorns on their stems or poison on their leaves.

Answer

Plants grow roots deeper into the ground, making them harder to remove.

Answer

Smaller plants bend and grow toward taller plants and trees.

Answer

Plants transpire and produce excess water to keep predators away.

Question 31

What do the arrows on a food web represent?

Accepted Answer

The direction of the flow of energy.

Answer

Where Mrs. Morris' class is located.

Answer

The direction to find south

Answer

The direction to find north

Question 32

A plant is placed in front of a window inside a classroom.  Over time, its stem and leaves bend toward the light.  Why does this occur?

Accepted Answer

because the sun is a positive stimulus

Answer

because the sun is a negative stimulus

Answer

because gravity is a positive stimulus

Answer

because gravity is a negative stimulus

Question 33

The highest concentration of ocean life is found in the top 200 meters of the ocean.  What is the most important factor in the ability of plants to grow in the ocean?

Accepted Answer

the amount of sunlight received

Answer

the amount of nutrients in the water

Answer

the small number of predators

Answer

the types of gases at the surface

Question 34

How do decomposers contribute as part of a food web?

Accepted Answer

They break down organic matter and produce different forms of energy.

Answer

They use energy from the sun to make sugars and other substances.

Answer

They provide most of the energy needed by producers.

Answer

They produce the oxygen needed for all organisms in the food web.

Question 35

A large tree in the forest blocks the sunlight fro a smaller plant.  How could this affect the smaller plant?

Accepted Answer

It could decrease the amount of food produced by the smaller plant.

Answer

It could increase the amount of oxygen released by the smaller plant.

Answer

It could force the smaller plant to rely on water for nutrition until conditions improve.

Answer

It could force the smaller plant to retrieve food molecules from the soil.

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