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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. Carbon atom - atomic number 6 - atomic mass 11
Metalloids
A converging lens produces a real image when
isotopes of each other
Pitch
2. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion
Crystals is a regular repeating Arrangement of atoms - ions - or molecules. They are well Organized structures. The 2 kinds of structures are:
Fahrenheit
Force
Hydrophilic
3. The interference that occurs when two waves combine to make a wave with a smaller amplitude
Atomic mass
Destructive interference
OHMS law
Longitudinal Waves
4. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.
Inside the nucleus
Forces on a moving object
Work
Kinetic Friction
5. Temporary magnets that lose their magnetism when electric current is removed
alloy
Electromagnets
Power
Newton's 3rd law motion
6. Liter is the base unit of...
Crystals is a regular repeating Arrangement of atoms - ions - or molecules. They are well Organized structures. The 2 kinds of structures are:
Double replacement Reactions
Heat vaporization
Volume
7. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change
Destructive interference
Radioactive Particles
Metalloids
Latent heat
8. Small uncharged particles in the nucleus they are neutral
Some characteristics of crystals
Radiation
Neutrons
As the train approaches and blasts its whistle - the whistle sounds..
9. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.
Electricity charged objects share these characteristics (3)
Latent heat
Electrophoresis
Load & switch
10. A functional group consisting of a sulfur atom bonded to a hydrogen atom (
Insulator
OHMS law
sulfhydryl group (Functional Group)
Halogens
11. Mass & weight are not the ____ quality
Difference between metals & non - metals
Calorimeter
same
Kinetic energy
12. Measure of the earth's pull
Weight
circut types
Heat vaporization
Excited electrons
13. A boulder is sitting at the edge of the cliff it has which type of energy?
Fahrenheit
Latent heat
Potential energy
A converging lens produces a real image when
14. The sum of the protons and neutrons
Eyeglasses are ____ so the image will hit the retina
the mass number of an atom
Nuclear reaction
Latent heat
15. Elements in the middle of the periodic table - in groups 3-12.
Non - metal
Radiation
Black
Transition elements
16. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles
Avogadros hypothesis
Kinetic Molecular theory
Catalysts
Kinetic energy
17. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.
Insulator
Radiation
Stable electron arrangement
First law of thermodynamics
18. Lacking affinity for water. Repels water. Non - polar
Single replacement reaction
maximum number of electrons that an atom holds with one energy level
Hydrophobic
Physical properties of Meralliods
19. Concave
A converging lens produces a real image when
Density
Eyeglasses are ____ so the image will hit the retina
birds
20. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.
Spectrophotometry
Newtons 2nd law of motion
Straight line motion
Excited electrons
21. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.
Newtons 2nd law of motion
Heat transfer
During ____ elements change into other elements change into other elements called _____ elements.
Bernoulli principle
22. 100x the base unit
Avogadros hypothesis
Hecto
Spectrophotometry
Latent heat
23. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen
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24. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.
Deci
Isotopes
Boron
Endothermic
25. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.
Volume
When light hits a smooth surface
The electromagnetic spectrum
Chemical reactions
26. # of electrons. Non - metals have 4-8 electrons in their outermost energy.
Difference between metals & non - metals
Catalysts
Atomic number
Seismographs
27. The relationship between voltage - current - and resistance - V=IR
Thermal equilibrium
OHMS law
Physical properties of Meralliods
Chemical bond
28. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.
Insulator
Electromagnets
Energy
Some substances have no noticeable odor because these substances
29. The total entropy of a system plus that of its surroundings always increase.
2nd law of thermodynamics
Calorimeter
potential energy
Decomposition reaction
30. The more energy the electrons have
Calorie
Heat latent
The higher the voltage
Length
31. Way of keeping tract of valence electrons
Excited electrons
Some Uses of electricity
Lewis dot structures
Non - electrolytes
32. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.
birds
newtons first law of motion
Radiation
Nuclear Fusion
33. Is the measure of energy temperature is a measure of the heat in an object.
Heat
Buret
Insulator
Hydrophobic
34. Ratio of the density of a substance to the density of water
Nuclear fission
Electrochemistry
Specific gravity
types of particles in the nucleus?
35. Atoms of the same element that have different numbers of neutrons
Circut
OHMS law
Isotopes
Gay - Lussac's Law
36. The mechanical energy that a body has by virtue of its motion - energy of a moving object.
Double replacement Reactions
Non - metals
Kinetic energy
Composition reaction
37. What are the # of protons in the nucleus of an atom called?
Atomic number
Some substances have no noticeable odor because these substances
Exothermic
Covalent Bonds
38. They form only over warm oceans
Radioactive Particles
Density
true of hurricanes but not of tornadoes
Chemical properties of metalliods
39. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).
Phosphate group
Crystals is a regular repeating Arrangement of atoms - ions - or molecules. They are well Organized structures. The 2 kinds of structures are:
Constructive interference
Nucleus
40. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat
The tilt of the Earth's axis of rotation relative to the ecliptic
Non - metal
Refraction
chemically active
41. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.
Stable electron arrangement
Kilo - calorie
Kinetic Molecular theory
Kelvin
42. The acceleration of an object depends on the mass of the object and the amount of force applied.
2nd law of thermodynamics
Transverse Waves
Physical properties of Meralliods
Newtons 2nd law of motion
43. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.
Types of Friction & Resistance
Deca
Some characteristics of crystals
Insulator
44. Mass of the substance contained per unit of volume
Entropy
Types of potential energy?
What are the 2 most common encountered forms of energy are
Density
45. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.
Atomic number
Catalysts
Sonar technology
types of nuclear reactions?
46. Are small positively charged particles
Electrochemistry
Electrons
The electromagnetic spectrum
Protons
47. 2 or more substances combine to form a compound EX. A+B -> AB
Length
Electricity charged objects share these characteristics (3)
Composition reaction
Current
48. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?
The presence of cells in the sample
maximum number of electrons that an atom holds with one energy level
The higher the voltage
Protons
49. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
circut types
Conduction
As the train approaches and blasts its whistle - the whistle sounds..
Celsius
50. 8 electrons
Refraction
maximum number of electrons that an atom holds with one energy level
Spectrophotometry
Heat transfer