Quiz about Science STAAR Review

Question 1

Immediately after a forest fire, the primary consumers in the area will compete most for which biotic factor?

Accepted Answer

Food

Answer

Space

Answer

Oxygen

Answer

Sunlight

Question 2

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?

Accepted Answer

Because of inertia, the ball continues rolling forward at the same speed.

Answer

Because of friction, the ball continues rolling forward at the same speed.

Answer

Because of friction, the ball rolls forward at an increased speed.

Answer

Because of inertia, the ball rolls forward at an increased speed.

Question 3

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?

Accepted Answer

The two liquids form a new solution.

Answer

There is a change in shape.

Answer

There is a change in volume.

Answer

The two liquids mix into a solution.

Question 4

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?

Accepted Answer

It is summer in the Northern Hemisphere. It is winter in the Southern Hemisphere.

Answer

It is August in the Northern Hemisphere. It is April in the Southern Hemisphere.

Answer

The number of hours of daylight is greater in the Southern Hemisphere than in the Northern Hemisphere.

Answer

Spring begins earlier in the year in the Southern Hemisphere than it does in the Northern Hemisphere.

Question 5

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?

Accepted Answer

Option C is correct

Answer

A.

Answer

B.

Answer

D.

Question 6

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?

Accepted Answer

$$1.3\ \frac{m}{s^2}$$

Answer

$$3450.5\ \frac{m}{s^2}$$

Answer

$$15.5\ \frac{m}{s^2}$$

Answer

$$0.77\ \frac{m}{s^2}$$

Question 7

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--

Accepted Answer

go down a steep slope and then become flatter

Answer

cross a canyon with a river running through it

Answer

cross another peak in the park

Answer

be flat and then go up a steep slope

Question 8

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

Accepted Answer

Fluorine, F and chlorine, Cl

Answer

Boron, B and aluminum, Al

Answer

Hydrogen, H and cesium, Cs

Answer

Cobalt, Co, and nickel, Ni

Question 9

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?

Accepted Answer

May 18

Answer

May 13

Answer

May 25

Answer

May 31

Question 10

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?

Accepted Answer

Phosphoric acid

Answer

Carbonic acid

Answer

Nitric acid

Answer

Sulfuric acid

Question 11

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--

Accepted Answer

near the soil, and species Y absorbs water found deep underground.

Answer

found deep underground, and species X absorbs water near the soil surface.

Answer

found deep underground, and species X absorbs water found deep underground.

Answer

near the soil surface, and species Y absorbs water near the soil surface.

Question 12

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?

Accepted Answer

The duck will continue moving in its current direction.

Answer

The duck will stop moving.

Answer

The duck will stop and then start moving again.

Answer

The duck will move in the direction that the stream is flowing.

Question 13

The H-R diagram shown is divided into four sections.

Which section of the diagram includes the coolest, brightest stars?

Accepted Answer

Section 2

Answer

Section 1

Answer

Section 3

Answer

Section 4

Question 14

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?

Accepted Answer

The wall pushes on the skater when the skater pushes on the wall.

Answer

The wheels slow down, and the skater stops

Answer

The skater exerts a force on the wall, and the wheels exert a force on the floor and begin to turn.

Answer

The friction of the floor decreases when the wheels roll on the floor.

Question 15

Which pair of elements has reactivity that is similar to chlorine, Cl?

Accepted Answer

Fluorine, F, and iodine, I

Answer

Fluorine, F, and argon, Ar

Answer

Sulfur, S, and bromine, Br

Answer

Sulfur, S, and argon, Ar

Question 16

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?

Accepted Answer

Leaves with the greatest amount of surface area

Answer

Leaves that are needle-shaped

Answer

Leaves that are smallest

Answer

Leaves that store the greatest amount of water

Question 17

Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation.

$$AgNo_3+NaCl\rightarrow AgCl+NaNO_3$$

What happens to the total mass as the reaction takes place?

Accepted Answer

The mass remains constant.

Answer

The mass increases.

Answer

The mass decreases.

Answer

The mass first decreases and then increases

Question 18

Students make a model using a globe and a flashlight.

Which answer choice best explains the change from daytime to nighttime on Earth?

Accepted Answer

Earth rotates and causes different parts of Earth to experience night.

Answer

The sun stops sending light to Earth at night.

Answer

Earth moves farther away from the sun at night.

Answer

The tilt of Earth causes less light to reach Earth at night.

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