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Praxis Elementary Education > Science: Practice Test > Flashcards

Science: Practice Test Flashcards

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1
Q

A star suddenly increases in brightness then fades from view

A

Supernova

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2
Q

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

A

Aurora

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3
Q

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

A

Inertia

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4
Q

Measures mass

A

Balance

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5
Q

Mass flow rate measured in

A

Grams per second

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6
Q

Bases have a pH btwn

A

7 and 14

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7
Q

Breaking a substance down without changing the composition of the substance

A

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

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8
Q

Example of a physical change

A

Water become ice ( ice can turn back into water)

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9
Q

Earth takes _ to rotate on its axis

A

24 hours

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10
Q

Moon takes _ to revolve around the earth

A

One month

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11
Q

Earth takes _ to revolve around the sun

A

One year

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12
Q

A rainbow demonstrates

A

Refraction( bends light of the sun)

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13
Q

Echo is example of

A

Sound reflection

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14
Q

Mirror demonstrates

A

Light reflection

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15
Q

Sound waves reflecting off layers of earths atmosphere

A

Radio

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16
Q

_ orbits the earth

A

Moon

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17
Q

Only star in our solar system

A

Sun

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18
Q

Caused by earthquake on ocean floor

A

Tsunami

19
Q

Space weather - huge explosions on the sun

A

Solar flares

20
Q

Makes up 78% of earths atmosphere

A

Nitrogen

21
Q

Smallest unit of an element

A

Atom

22
Q

Two or more atoms, simplest form of a compound

A

Molecule

23
Q

Electrically charged atom or group of atoms

A

Ion

24
Q

Amount of matter in an object

Measure of gravitational pull on an object

A

Mass

Weight

25
Q

Found in earths crust, essential to plant growth

Element most common in universe

A

Potassium

Carbon

26
Q

What substance neutralizes an acid spill

What substance neutralizes a base spill

A

Sodium bicarbonate

Citric acid

27
Q

When fossil fuels are burned they form

A

Carbon dioxide

28
Q

Warm air moves into cold air mass

Cold air over into warm air mass

Unstable air

A

Warm front

Cold front

Tornado

29
Q

Contour line indicating locations of equal barometric pressure

A

Isobar

30
Q

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

A

Biosphere

31
Q

Velocity x mass =

Bicep curl

A

Momentum

32
Q

Insulators (3)

Thermal conductor

A

Plastic, rubber, porcelain

Aluminum

33
Q

Filter waste from the cell in the cytoplasm

A

Lysosomes

34
Q

Part of atom flows through circuit to power a lightbulb

A

Electrons

35
Q

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

A

Ions

36
Q

Sandstone is a type of _ rock

A

Sedimentary rock

37
Q

Endothermic animals (2)

A

Birds and mammals

38
Q

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

A

Commensalism

39
Q

Magnets readily attract _

A

Iron

40
Q

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

A

Atmosphere

41
Q

Temperature , pressure and density _ as altitude increases

A

Decrease

42
Q

Book sitting on a table is an example of

A

Gravitational potential energy

43
Q

Two negatives charges will

A

Repel each other

44
Q

Process of plants making glucose called?

A

Calvin cycle

Praxis Elementary Education (34 decks)

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