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Test your basic knowledge |
Praxis General Science
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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. Removal of static electricity by conduction
Grounding Charge
Decomposition reaction
During ____ elements change into other elements change into other elements called _____ elements.
Metalloids
2. Inclined plane - lever - wheel & axle - pulley.
Simple machines
electrostatics
Potential difference
Centrifuge
3. 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
Endothermic
Applications of Archimedes principle
Carbon Dioxide
Exothermic
4. # of protons + # of neutrons
Mass number
Eyeglasses are ____ so the image will hit the retina
Forces on a moving object
Charles law
5. Polar molecules
Hydrophilic
electrostatics
Length
Celsius
6. An isotope has a different number of...
Boron
isotopes of each other
Neutrons
Alkali metals are
7. The mechanical energy that a body has by virtue of its motion - energy of a moving object.
OHMS law
Kinetic energy
Heat
Potential difference
8. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.
Pasteur's postulate
Newtons 2nd law of motion
Kinetic Friction
Phases of matter
9. Nuclear fission - Nuclear Fusion
types of nuclear reactions?
Thermal contact
Radiation
Convection
10. The interference that occurs when two waves combine to make a wave with a smaller amplitude
Newton's 3rd law motion
Push & Pull
Destructive interference
Mass number
11. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.
Louis Pasteur
Power
Electricity charged objects share these characteristics (3)
Constructive interference
12. Mass & weight are not the ____ quality
Kilo
same
Hecto
Straight line motion
13. The amount of energy required for the liquid at its boiling point to become a gas
Alkali metals are
Valence electrons
Heat vaporization
Newton's 3rd law motion
14. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.
Ionic Bonds
Weight
Atom
Rubbing
15. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.
Physical properties of Meralliods
Endothermic
Noble gasses
Applications of Archimedes principle
16. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.
Applications of Archimedes principle
Kilo - calorie
Radiation
Thermal equilibrium
17. 1. Constructive 2. Destructive
Buret
Condensation
Two types of wave interference are (sound related)
Electricity charged objects share these characteristics (3)
18. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.
Calorimeter
Electromagnets
Physical properties of Meralliods
Chemical properties of metalliods
19. Average mass of various isotopes of the element.
Noble gasses
Newton's 3rd law motion
Linear acceleration
Atomic mass
20. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?
64.0 grams
Radioactive Particles
Straight line motion
Excited electrons
21. Measure of the earth's pull
Weight
Heat conduction
Centrifuge
Rubbing
22. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons
Ampmeter
the mass number of an atom
Gay - Lussac's Law
Atomic mass
23. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.
Compound machines
Semi - conductors
Force
At the bottom of the meniscus curve
24. Current is measured with a device called...
Ampmeter
Physical properties of Meralliods
Heat
electroscope
25. Mass of the substance contained per unit of volume
Density
Kinetic energy
Covalent Bonds
Volume
26. The device (bell or Build) is an example of a load. A load is a device that uses energy.
Simple machines
Weak Electrolytes
An electromagnet can be made more powerful in 3 ways
Load & switch
27. 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
Corona
The higher the voltage
Contains ions
28. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.
Electromagnets
Covalent Bonds
Avogadros hypothesis
Force
29. 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
Protons
Pitch
Electrochemistry
30. 1/10 the base unit
Difference between metals & non - metals
Calorie
Deci
Atomic mass
31. A principle that states that for every action there is an equal reaction in the opposite direction
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32. The speed of light changes in different materials this is due to__
types of particles in the nucleus?
Refraction
Eyeglasses are ____ so the image will hit the retina
Pascal
33. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.
Direct Variations
Group 2 on the periodic table
Insulator
64.0 grams
34. 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.
Spectrophotometry
Hecto
Direct Variations
Longitudinal Waves
35. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
Venturi effect
Stable electron arrangement
Celsius
Calorie
36. 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.
Heat conduction
Newton's 3rd law motion
Electrophoresis
Neutrons
37. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.
Atom
Radioactive Particles
Non - metals
Hydrocarbons
38. 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.
Potential difference
Transverse Waves
Neutrons
Length
39. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX
Double replacement Reactions
newtons first law of motion
Some Uses of electricity
Atom
40. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces
Venturi effect
Conduction
Single replacement reaction
Transition elements
41. 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)
Push & Pull
Composition reaction
Strong electrolytes
Chemical reactions
42. Relates pressure & temp. and temp and volume.
Heat transfer
Chemical properties of metalliods
Direct Variations
Metalloids
43. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.
Electrophoresis
Inertia & circular motion
Noble gasses
Specific gravity
44. 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
Heat is transferred in 3 ways
Stable electron arrangement
The presence of cells in the sample
Latent heat
45. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs
Entropy
Chromatography
Heat
An electromagnet can be made more powerful in 3 ways
46. Is the measure of energy temperature is a measure of the heat in an object.
Heat
Newtons 2nd law of motion
Static friction
When a light hits a rough surface
47. Solids - gasses - and 1 liquid (Bromine)
Non - metals
Types of Friction & Resistance
The intensity of sound is measured in
Constructive interference
48. The transfer of heat by electromagnetic waves is called?
birds
Weak Electrolytes
Chordates
Radiation
49. Conduction - Convection - & Radiation
Chordates
Heat is transferred in 3 ways
Mass
chemically active
50. The total entropy of a system plus that of its surroundings always increase.
2nd law of thermodynamics
Magnetic field
The intensity of sound is measured in
Forces on objects at rest
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