Science: Practice Test

Question 1

A star suddenly increases in brightness then fades from view

Answer 1

Supernova

Question 2

Colored lights that appear in the sky near the north and south poles

Answer 2

Aurora

Question 3

Objects tendency not to change position or direction unless an outside force acts upon it

Answer 3

Inertia

Question 4

Measures mass

Answer 4

Balance

Question 5

Mass flow rate measured in

Answer 5

Grams per second

Question 6

Bases have a pH btwn

Answer 6

7 and 14

Question 7

Breaking a substance down without changing the composition of the substance

Answer 7

Mechanical weathering ( breaking a substance down without changing the composition)

Question 8

Example of a physical change

Answer 8

Water become ice ( ice can turn back into water)

Question 9

Earth takes _ to rotate on its axis

Answer 9

24 hours

Question 10

Moon takes _ to revolve around the earth

Answer 10

One month

Question 11

Earth takes _ to revolve around the sun

Answer 11

One year

Question 12

A rainbow demonstrates

Answer 12

Refraction( bends light of the sun)

Question 13

Echo is example of

Answer 13

Sound reflection

Question 14

Mirror demonstrates

Answer 14

Light reflection

Question 15

Sound waves reflecting off layers of earths atmosphere

Answer 15

Radio

Question 16

_ orbits the earth

Answer 16

Moon

Question 17

Only star in our solar system

Answer 17

Sun

Question 18

Caused by earthquake on ocean floor

Answer 18

Tsunami

Question 19

Space weather - huge explosions on the sun

Answer 19

Solar flares

Question 20

Makes up 78% of earths atmosphere

Answer 20

Nitrogen

Question 21

Smallest unit of an element

Answer 21

Atom

Question 22

Two or more atoms, simplest form of a compound

Answer 22

Molecule

Question 23

Electrically charged atom or group of atoms

Answer 23

Ion

Question 24

Amount of matter in an object

Measure of gravitational pull on an object

Answer 24

Mass

Weight

Question 25

Found in earths crust, essential to plant growth Element most common in universe

Answer 25

Potassium Carbon

Question 26

What substance neutralizes an acid spill What substance neutralizes a base spill

Answer 26

Sodium bicarbonate Citric acid

Question 27

When fossil fuels are burned they form

Answer 27

Carbon dioxide

Question 28

Warm air moves into cold air mass Cold air over into warm air mass Unstable air

Answer 28

Warm front Cold front Tornado

Question 29

Contour line indicating locations of equal barometric pressure

Answer 29

Isobar

Question 30

Part of earth where life exists, included atmosphere, oceans, life supporting areas above or below earths surface

Answer 30

Biosphere

Question 31

Velocity x mass = | Bicep curl

Answer 31

Momentum

Question 32

Insulators (3) Thermal conductor

Answer 32

Plastic, rubber, porcelain Aluminum

Question 33

Filter waste from the cell in the cytoplasm

Answer 33

Lysosomes

Question 34

Part of atom flows through circuit to power a lightbulb

Answer 34

Electrons

Question 35

_ are atoms that have lost or gained electrons and have a charge

Answer 35

Ions

Question 36

Sandstone is a type of _ rock

Answer 36

Sedimentary rock

Question 37

Endothermic animals (2)

Answer 37

Birds and mammals

Question 38

One organism benefits from another without causing harm to the host organism

Answer 38

Commensalism

Question 39

Magnets readily attract _

Answer 39

Iron

Question 40

_ refers to the layers of gases that surround the the earth

Answer 40

Atmosphere

Question 41

Temperature , pressure and density _ as altitude increases

Answer 41

Decrease

Question 42

Book sitting on a table is an example of

Answer 42

Gravitational potential energy

Question 43

Two negatives charges will

Answer 43

Repel each other

Question 44

Process of plants making glucose called?

Answer 44

Calvin cycle