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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. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.
Kinetic Friction
Nuclear Fusion
Some substances have no noticeable odor because these substances
Inertia & circular motion
2. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power
alloy
Non - electrolytes
An electromagnet can be made more powerful in 3 ways
Hydrophobic
3. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
Load & switch
Types of kinetic energy?
Celsius
Bernoulli principle
4. The branch of physics that deals with static electricity - study of stationary electric charges.
electrostatics
Celsius
Weight
Water
5. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases
Heat vaporization
Strong electrolytes
Physical properties of Meralliods
Boyles law states
6. Animals in which of the following groups may have a backbone and a spinal cord?
Some substances have no noticeable odor because these substances
Difference between metals & non - metals
Chordates
Atom
7. Which of the following parts of the Sun is easily visible only during a total solar eclipse
Density
Corona
Mass
Conduction
8. Reflects the light in one direction
Atomic mass
Mass number
When light hits a smooth surface
electroscope
9. Alkaline earth metals
Crystals is a regular repeating Arrangement of atoms - ions - or molecules. They are well Organized structures. The 2 kinds of structures are:
Spectrophotometry
Group 2 on the periodic table
Electrons
10. They are neither precise nor accurate.
The true length of a block of wood is 1.010 cm. Three measurements of this block produced the following values: 1.4 cm - 1.2 cm - and 0.9 cm. Which of the following statements is true concerning these measurements?
Radiation
types of particles in the nucleus?
Carbon Dioxide
11. What are the # of protons in the nucleus of an atom called?
oscilloscope
Atomic number
Kilo - calorie
Length
12. The relationship between voltage - current - and resistance - V=IR
OHMS law
Electrophoresis
Work
Types of kinetic energy?
13. Inclined plane - lever - wheel & axle - pulley.
Milli
Direct Variations
Simple machines
Ampmeter
14. Heat transferred by direct contact
Conduction
Work
Electromagnets
newtons first law of motion
15. # of protons + # of neutrons
Mass number
Non - electrolytes
Pasteur's postulate
Mass
16. The total entropy of a system plus that of its surroundings always increase.
Milli
2nd law of thermodynamics
Fahrenheit
Conduction
17. Temporary magnets that lose their magnetism when electric current is removed
Chemical reactions
Kelvin
Chemical properties of metalliods
Electromagnets
18. The region around a magnet where the magnetic force is exerted
Kilo
Magnetic field
true of hurricanes but not of tornadoes
Chordates
19. Specific gravity is the ratio based on...
Density
Series circut
Hydrophilic
Pitch
20. Current is measured with a device called...
Ampmeter
Silicon
Potential energy
electroscope
21. The acceleration of an object depends on the mass of the object and the amount of force applied.
3rd law of thermodynamics
Longitudinal Waves
Hydrophobic
Newtons 2nd law of motion
22. (physics and chemistry) the smallest component of an element having the chemical properties of the element
Current
Corona
Thermal equilibrium
Atom
23. Shiny - softer & less dense. Mostly chemically active
Halogens
Alkali metals are
Heat vaporization
During ____ elements change into other elements change into other elements called _____ elements.
24. 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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25. Finding that a solution conducts an electric current shows conclusively that the solution...
Contains ions
Some Uses of electricity
Pitch
Endothermic
26. Change in the apparent frequency of a wave as observer and source move toward or away from each other
Metalloids
Doppler effect
Mass
Condensation
27. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.
Nuclear fission
Boron
Gay - Lussac's Law
Mass
28. 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
Carbon Dioxide
Inside the nucleus
Fahrenheit
Laws of thermodynamic / Laws of conservation
29. Solids - gasses - and 1 liquid (Bromine)
Heat vaporization
Non - metals
Series circut
Simple machines
30. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.
3rd law of thermodynamics
Pull of gravity
Hydrocarbons
Boron
31. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons
Fahrenheit
Atomic mass
Doppler effect
Pitch
32. Removal of static electricity by conduction
Grounding Charge
Constructive interference
Load & switch
What are the 2 most common encountered forms of energy are
33. Concave
Eyeglasses are ____ so the image will hit the retina
Pull of gravity
Atomic mass
Heat is transferred in 3 ways
34. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.
Noble gasses
Group 1 on the periodic table are all
Carbon Dioxide
Silicon
35. Do not have molecules with one of the two molecular arrangements required to give an odor
maximum number of electrons that an atom holds with one energy level
Gay - Lussac's Law
Atomic mass
Some substances have no noticeable odor because these substances
36. The interference that occurs when two waves combine to make a wave with a smaller amplitude
Forces on objects at rest
Kilo - calorie
Venturi effect
Destructive interference
37. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.
Deca
Semi - conductors
Static friction
Endothermic
38. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.
Ionic Bonds
Rubbing
Louis Pasteur
Metalloids
39. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.
Chemical reactions
Double replacement Reactions
Straight line motion
OHMS
40. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.
Exothermic
Charles law
Parallel Circut
Radiation
41. 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
the mass number of an atom
Kilo - calorie
Laws of thermodynamic / Laws of conservation
42. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.
Atomic number
types of particles in the nucleus?
Circut
Nuclear fission
43. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.
Convection
Phosphate group
Thermal equilibrium
During ____ elements change into other elements change into other elements called _____ elements.
44. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B
2nd law of thermodynamics
Nuclear reaction
When light hits a smooth surface
Single replacement reaction
45. Excess energy is released into the environment
Radioactive Particles
Centrifuge
Exothermic
Constructive interference
46. Polar molecules
Transverse Waves
Hydrophilic
types of nuclear reactions?
Kilo
47. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease
Conduction
chemically active
Chemical reactions
Louis Pasteur
48. Non - metals - group 18 - the most non - reactive elements
Latent heat
Gay - Lussac's Law
Kinetic energy
Noble gasses
49. 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.
Endothermic
Chemical properties of metalliods
Applications of Archimedes principle
Law of momentum conservation
50. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.
Work
Neutrons
2nd law of thermodynamics
Chemical bond
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