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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. The sum of the protons and neutrons
OHMS law
Alkali metals are
the mass number of an atom
Weak Electrolytes
2. The volume of a gas is directly proportional to the temperature of a gas
Types of potential energy?
The presence of cells in the sample
Kinetic Friction
Charles law
3. Temporary magnets that lose their magnetism when electric current is removed
Electromagnets
Current
The tilt of the Earth's axis of rotation relative to the ecliptic
64.0 grams
4. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.
Refraction
Static friction
What are the 2 most common encountered forms of energy are
Energy
5. Heat transferred by fluid current
Neutrons
Chemical reactions
Convection
An electromagnet can be made more powerful in 3 ways
6. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.
Convection
Heat Fusion
Nuclear energy
Doppler effect
7. What are the # of protons in the nucleus of an atom called?
Rubbing
Law of momentum conservation
Latent heat
Atomic number
8. Measure of the earth's pull
Archimedes principle
Rubbing
Hecto
Weight
9. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.
Forces on a moving object
Ionic Bonds
Kilo - calorie
Density
10. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.
Types of Friction & Resistance
Conduction
Kelvin
Endothermic
11. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?
Magnetic domains
The higher the voltage
64.0 grams
Energy
12. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.
Law of momentum conservation
Heat is transferred in 3 ways
Pull of gravity
Some Uses of electricity
13. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point
Condensation
Weak Electrolytes
Phases of matter
Heat Fusion
14. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.
Physical properties of Meralliods
Radiation
Longitudinal Waves
Group 2 on the periodic table
15. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.
Nuclear reaction
Calorimeter
Nucleus
Radioactive Particles
16. Current is measured with a device called...
Calorie
Ampmeter
Archimedes principle
Refraction
17. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat
Kilo - calorie
Non - metal
Endothermic
Density
18. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.
Chemical bond
Conduction
Spectrophotometry
Group 1 on the periodic table are all
19. The speed of light changes in different materials this is due to__
Refraction
Deci
Bernoulli principle
Spectrophotometry
20. Alkali Metals are the most _____________
Heat is transferred in 3 ways
Laws of thermodynamic / Laws of conservation
chemically active
Electrophoresis
21. Specific gravity is the ratio based on...
Density
Hydroxyl group ( Functional group)
Types of potential energy?
Neutrons
22. A wave in which the particles move parallel to the path of the wave
Grounding Charge
Alkali metals are
Longitudinal Waves
Kinetic Friction
23. Is the study of the relationship between motion & the forces affecting motion.
Dynamics
Forces on a moving object
Louis Pasteur
Mass
24. Which of the following parts of the Sun is easily visible only during a total solar eclipse
Corona
Mass
Deci
Types of kinetic energy?
25. Experiments may not be done on...
Deca
birds
Gay - Lussac's Law
Longitudinal Waves
26. Objects are in thermal contact if they can affect each others temperature
Thermal contact
Stable electron arrangement
Mass
Direct Variations
27. You see your reflection
Buret
Water
When light hits a smooth and shiny surface
Avogadros hypothesis
28. The object is further than one focal length from the lens
Electromagnets
Types of Friction & Resistance
Silicon
A converging lens produces a real image when
29. The process of heat transfer via solid contact
Milli
Heat conduction
Conduction
Covalent Bonds
30. The molecular weight of a substance expressed in grams - measures the amount of a substance
Mole
Rubbing
The electromagnetic spectrum
Noble gasses
31. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)
Venturi effect
Boyles law states
circut types
Push & Pull
32. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.
Types of Friction & Resistance
oscilloscope
Laws of thermodynamic / Laws of conservation
Density
33. 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:
OHMS law
Phases of matter
An electromagnet can be made more powerful in 3 ways
34. 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
Transverse Waves
Group 2 on the periodic table
Heat Fusion
Carbon Dioxide
35. 2 or more substances combine to form a compound EX. A+B -> AB
Strong electrolytes
Carbon Dioxide
During ____ elements change into other elements change into other elements called _____ elements.
Composition reaction
36. Is the change from liquid to gas.
Evaporation
Radioactive Particles
Static friction
Bernoulli principle
37. 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.
birds
sulfhydryl group (Functional Group)
circut types
Potential difference
38. It scatters light in many directions
Kinetic Molecular theory
When a light hits a rough surface
Types of potential energy?
Heat is transferred in 3 ways
39. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.
Heat
Magnetic domains
isotopes of each other
During ____ elements change into other elements change into other elements called _____ elements.
40. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.
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41. Excess energy is released into the environment
Simple machines
Double replacement Reactions
Exothermic
Celsius
42. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia
Celsius
Destructive interference
Mole
newtons first law of motion
43. 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.
The electromagnetic spectrum
Heat
Electromagnets
Specific gravity
44. Negatively charged particles found outside the nucleus
Nucleus
Noble gasses
Electrons
Radiation
45. Change in the apparent frequency of a wave as observer and source move toward or away from each other
Conduction
Potential difference
Doppler effect
Forces on a moving object
46. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.
alloy
Electrophoresis
Convection
Conduction
47. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.
The presence of cells in the sample
Forces on a moving object
Electricity charged objects share these characteristics (3)
Circut
48. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?
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49. They form only over warm oceans
Excited electrons
true of hurricanes but not of tornadoes
electrostatics
Protons
50. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.
The tilt of the Earth's axis of rotation relative to the ecliptic
Latent heat
Group 2 on the periodic table
Kinetic Friction