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Test your basic knowledge |
Praxis General Science
Start Test
Study First
Subjects
:
praxis
,
science
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.
Decomposition reaction
Specific gravity
Radiation
3rd law of thermodynamics
2. An electric circut with a single path
Series circut
Calorie
the mass number of an atom
Weight
3. Objects are in thermal contact if they can affect each others temperature
Constructive interference
Length
Group 2 on the periodic table
Thermal contact
4. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.
Laws of thermodynamic / Laws of conservation
Transverse Waves
Constructive interference
Spectrophotometry
5. The mechanical energy that a body has by virtue of its motion - energy of a moving object.
Neutrons
Kinetic energy
Nuclear fission
circut types
6. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.
oscilloscope
Electricity charged objects share these characteristics (3)
Linear acceleration
Chemical properties of metalliods
7. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -
At the bottom of the meniscus curve
Isotopes
Excited electrons
Some Uses of electricity
8. The interference that occurs when two waves combine to make a wave with a larger amplitude
Atomic mass
Deca
2nd law of thermodynamics
Constructive interference
9. They form only over warm oceans
true of hurricanes but not of tornadoes
Celsius
Water
The tilt of the Earth's axis of rotation relative to the ecliptic
10. Ratio of the density of a substance to the density of water
Eyeglasses are ____ so the image will hit the retina
OHMS law
Specific gravity
Silicon
11. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b
Centrifuge
Difference between metals & non - metals
Push & Pull
Parallel Circut
12. (physics and chemistry) the smallest component of an element having the chemical properties of the element
Mass
The higher the voltage
During ____ elements change into other elements change into other elements called _____ elements.
Atom
13. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?
Electrons
Transverse Waves
Thermal equilibrium
64.0 grams
14. Is the path along which electrons flow
Louis Pasteur
Insulin
Circut
Buret
15. The total entropy of a system plus that of its surroundings always increase.
Magnetic field
An electromagnet can be made more powerful in 3 ways
Forces on objects at rest
2nd law of thermodynamics
16. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.
Heat is transferred in 3 ways
Physical properties of Meralliods
Ionic Bonds
maximum number of electrons that an atom holds with one energy level
17. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.
Inside the nucleus
isotopes of each other
Electricity charged objects share these characteristics (3)
Conduction
18. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper
OHMS law
alloy
Potential energy
Water
19. 1/1000 the base unit
Milli
Some Uses of electricity
Hydrophilic
Inside the nucleus
20. 100x the base unit
Longitudinal Waves
Hecto
Kinetic Friction
Electromagnets
21. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
Heat conduction
Nuclear Fusion
Destructive interference
Celsius
22. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?
Chromatography
Linear acceleration
Group 1 on the periodic table are all
Endothermic
23. Specific gravity is the ratio based on...
Composition reaction
When light hits a smooth and shiny surface
Density
Forces on a moving object
24. Negatively charged particles found outside the nucleus
Electrons
Sonar technology
Atomic mass
The higher the voltage
25. The property of sound that varies with variation in the frequency of vibration.
Nucleus
Pitch
Non - metals
same
26. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions
Evaporation
Metalloids
Electrochemistry
Electrophoresis
27. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.
Conduction
Resistance
true of hurricanes but not of tornadoes
Celsius
28. Atoms with an equal # of protons and electrons.
Difference between metals & non - metals
Pitch
Calorimeter
Ions are
29. Liter is the base unit of...
Physical properties of Meralliods
Volume
Corona
conducted more easily
30. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease
Chordates
Louis Pasteur
Lewis dot structures
Ionic Bonds
31. The ability of the material to oppose the flow of electrons through it all
Convection
Resistance
Destructive interference
Applications of Archimedes principle
32. Gram is the base unit of...
Excited electrons
Mass
Heat transfer
Metalloids
33. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.
Deci
When a light hits a rough surface
Fahrenheit
Kilo - calorie
34. A heat that required to change (water from liquid to solid) from one state to another.
Heat latent
Insulin
Atomic number
When light hits a smooth surface
35. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.
Heat vaporization
Density
Latent heat
Rubbing
36. Is the change from liquid to gas.
Evaporation
Excited electrons
newtons first law of motion
At the bottom of the meniscus curve
37. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible
Isotopes
Carbon Dioxide
Hydrophobic
Current
38. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.
types of nuclear reactions?
Ions are
Forces on objects at rest
Ampmeter
39. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.
Entropy
An electromagnet can be made more powerful in 3 ways
64.0 grams
Strong electrolytes
40. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.
isotopes of each other
Seismographs
Hydroxyl group ( Functional group)
Chemical reactions
41. Finding that a solution conducts an electric current shows conclusively that the solution...
Rubbing
Physical properties of Meralliods
Heat is transferred in 3 ways
Contains ions
42. The buoyant force on an object is equal to the weight of the fluid displaced by the object
Archimedes principle
Potential difference
Heat conduction
Physical properties of Meralliods
43. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.
Kinetic Friction
Power
A converging lens produces a real image when
Sonar technology
44. Are small positively charged particles
Boyles law states
Protons
Exothermic
Phosphate group
45. Which of the following parts of the Sun is easily visible only during a total solar eclipse
Hecto
Magnetic field
Corona
Atomic mass
46. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.
Celsius
Catalysts
Avogadros hypothesis
Electricity charged objects share these characteristics (3)
47. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.
Endothermic
Inertia & circular motion
Applications of Archimedes principle
When light hits a smooth and shiny surface
48. Atoms of the same element that have different numbers of neutrons
Isotopes
Simple machines
types of particles in the nucleus?
Inertia & circular motion
49. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.
Excited electrons
Potential difference
alloy
Isotopes
50. Is the measure of energy temperature is a measure of the heat in an object.
Magnetic field
Nuclear fission
Convection
Heat