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WorksheetsScience STAAR Review
Total questions: 20
Worksheet time: 13mins
Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor?
Food
Space
Oxygen
Sunlight
A steel ball is at one end of a box that is moving forward as shown. The box suddenly stops.
According to Newton's first law, what happens to the steel ball just after the box stops?
Because of friction, the ball continues rolling forward at the same speed.
Because of friction, the ball rolls forward at an increased speed.
Because of inertia, the ball continues rolling forward at the same speed.
Because of inertia, the ball rolls forward at an increased speed.
Students mixed two liquids in beaker and listed their observations.
Based on these observations, which statement contains the best evidence that a chemical reaction occurred?
There is a change in shape.
There is a change in volume.
The two liquids mix into a solution.
The two liquids form a new solution.
The diagram shows Earth in its orbit around the sun when very little light is visible at Earth's South Pole.
Which statement is true when Earth is in the position shown?
It is August in the Northern Hemisphere. It is April in the Southern Hemisphere.
It is summer in the Northern Hemisphere. It is winter in the Southern Hemisphere.
The number of hours of daylight is greater in the Southern Hemisphere than in the Northern Hemisphere.
Spring begins earlier in the year in the Southern Hemisphere than it does in the Northern Hemisphere.
Tiny organisms called Daphnia live in lakes and ponds where they consume algae. A lake with a stable population of algae and Daphnia was contaminated by pollution, resulting in the death of many algae.
Which graph shows the most likely trend in the Daphnia population in the lake shortly before and after the pollution event?
A student pushes a 51.5 kilogram bookshelf across a smooth floor with a net force of 67N. What is the approximate acceleration of the bookshelf?
1.3 s2m
3450.5 s2m
15.5 s2m
0.77 s2m
A topographic map provides details about Emory Peak in Big Bend National Park. A radio tower on Emory Peak is indicated.
Based on the topographic map, if a park ranger hiked due west from the radio tower, the ranger's path would--
cross a canyon with a river running through it
cross another peak in the park
be flat and then go up a steep slope
go down a steep slope and then become flatter
Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?
Fluorine, F and chlorine, Cl
Boron, B and aluminum, Al
Hydrogen, H and cesium, Cs
Cobalt, Co, and nickel, Ni
How many neutrons are in the nucleus of a potassium atom with a mass number of 39?
(a)
Students recorded the dates in May on which they observed a full moon and a last quarter moon.
On which date will they most likely be able to observe a new moon?
May 13
May 18
May 25
May 31
The names and chemical formulas of four substances are shown in the chart.
Which substance listed in the chart are made up of the most atoms?
Carbonic acid
Nitric acid
Phosphoric acid
Sulfuric acid
Three different species of plants that live in the desert are shown.
Species Z can successfully share the same environment with the other plants shown because species Z absorbs water--
found deep underground, and species X absorbs water near the soil surface.
found deep underground, and species X absorbs water found deep underground.
near the soil surface, and species Y absorbs water near the soil surface.
near the soil, and species Y absorbs water found deep underground.
The diagram shows a duck swimming in a stream in the opposite direction the stream is flowing. The duck pushes against the water, so the water pushes the duck forward with 20 newtons of force. The water also exerts 15 newtons of resistive force again the duck.
Which statement best describes the resulting motion of the duck?
The duck will stop moving.
The duck will stop and then start moving again.
The duck will continue moving in its current direction.
The duck will move in the direction that the stream is flowing.
The H-R diagram shown is divided into four sections.
Which section of the diagram includes the coolest, brightest stars?
Section 1
Section 2
Section 3
Section 4
A skater pushes off a wall and skates backward for a few meters before stopping.
Which statement best describes an action-reaction force pair in this situation?
The wall pushes on the skater when the skater pushes on the wall.
The wheels slow down, and the skater stops
The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.
The friction of the floor decreases when the wheels roll on the floor.
This picture shows scratches in bedrock that were caused by a moving glacier. These scratches are called glacial striations.
Glacial striations in the bedrock of South Africa indicate that glaciers once moved across the African continent. The presence of glaciers on the surface of Africa is evidence that —
the tectonic plate under Africa was closer to the South Pole at one time.
the equator was not always where it is currently located
volcanoes did not exist until after faults occurred in Earth’s crust
the location of the North Pole and the South Pole changed
Which pair of elements has reactivity that is similar to chlorine, Cl?
Fluorine, F, and argon, Ar
Fluorine, F, and iodine, I
Sulfur, S, and bromine, Br
Sulfur, S, and argon, Ar
Plants that live on the floors of densely populated forests must compete for sunlight. Which type of leaves are most likely found on plants that are best suited to living on the floor of a dense forest?
Leaves that are needle-shaped
Leaves that are smallest
Leaves that store the greatest amount of water
Leaves with the greatest amount of surface area
Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.
AgNo3+NaCl→AgCl+NaNO3
What happens to the total mass as the reaction takes place?
The mass increases.
The mass decreases.
The mass remains constant.
The mass first decreases and then increases
Students make a model using a globe and a flashlight.
Which answer choice best explains the change from daytime to nighttime on Earth?
The sun stops sending light to Earth at night.
Earth moves farther away from the sun at night.
The tilt of Earth causes less light to reach Earth at night.
Earth rotates and causes different parts of Earth to experience night.
