Gibilisco - Basic Physical Concepts
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- 1.The atomic number of an element is determined by
- A.
The number of neutrons.
- B.
The number of protons.
- C.
The number of neutrons plus the number of protons.
- D.
The number of electrons.
- 2.The atomic weight of an element is approximately determined by
- A.
The number of neutrons.
- B.
The number of protons.
- C.
The number of neutrons plus the number of protons.
- D.
The number of electrons.
- 3.Suppose there is an atom of oxygen, containing eight protons and eight neutrons in thenucleus, and two neutrons are added to the nucleus. What is the resulting atomic weight?
- A.
8
- B.
10
- C.
16
- D.
18
- 4.An ion
- A.
Is electrically neutral.
- B.
Has positive electric charge.
- C.
Has negative electric charge.
- D.
Can have either a positive or negative charge.
- 5.An isotope
- A.
Is electrically neutral.
- B.
Has positive electric charge.
- C.
Has negative electric charge.
- D.
Can have either a positive or negative charge.
- 6.A molecule
- A.
Can consist of a single atom of an element.
- B.
Always contains two or more elements.
- C.
Always has two or more atoms.
- D.
Is always electrically charged.
- 7.In a compound,
- A.
There can be a single atom of an element.
- B.
There must always be two or more elements.
- C.
The atoms are mixed in with each other but not joined.
- D.
There is always a shortage of electrons.
- 8.An electrical insulator can be made a conductor
- A.
By heating it.
- B.
By cooling it.
- C.
By ionizing it.
- D.
By oxidizing it.
- 9.Of the following substances, the worst conductor is
- A.
Air.
- B.
Copper.
- C.
Iron.
- D.
Salt water.
- 10.Of the following substances, the best conductor is
- A.
Air.
- B.
Copper.
- C.
Iron.
- D.
Salt water.
- 11.
- A.
Is like a flow of electrons in the same direction.
- B.
Is possible only if the current is high enough.
- C.
Results in a certain amount of electric current.
- D.
Causes the material to stop conducting.
- 12.If a material has low resistance, then
- A.
It is a good conductor.
- B.
It is a poor conductor.
- C.
The current flows mainly in the form of holes.
- D.
Current can flow only in one direction.
- 13.A coulomb
- A.
Represents a current of 1 ampere.
- B.
Flows through a 100-watt light bulb.
- C.
Is equivalent to 1 ampere per second.
- D.
Is an extremely large number of charge carriers.
- 14.A stroke of lightning
- A.
Is caused by a movement of holes in an insulator.
- B.
Has a very low current.
- C.
Is a discharge of static electricity.
- D.
Builds up between clouds.
- 15.The volt is the standard unit of
- A.
Current.
- B.
Charge.
- C.
Electromotive force.
- D.
Resistance.
- 16.If an EMF of 1 volt is placed across a resistance of 2 ohms, then the current is
- A.
Half an ampere.
- B.
1 ampere.
- C.
2 amperes.
- D.
Impossible to determine.
- 17.A backward-working electric motor, in which mechanical rotation is converted to electricity,is best described as
- A.
An inefficient, energy-wasting device.
- B.
A motor with the voltage connected the wrong way.
- C.
An electric generator.
- D.
A magnetic field.
- 18.In a battery, chemical energy can sometimes be replenished by
- A.
Connecting it to a light bulb.
- B.
Charging it.
- C.
Discharging it.
- D.
No means known; when a battery is dead, you must throw it away.
- 19.A fluctuating magnetic field
- A.
Produces an electric current in an insulator.
- B.
Magnetizes the earth.
- C.
Produces a fluctuating electric field.
- D.
Results from a steady electric current.
- 20.Visible light is converted into electricity
- A.
In a dry cell.
- B.
In a wet cell.
- C.
In an incandescent bulb.
- D.
In a photovoltaic cell.
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