Electronics Engineering
Priority Level: High (ECE) & Medium (ECT)
- 1.Of the following substances, the best conductor is
- A.
Air
- B.
Copper
- C.
Iron
- D.
Salt water
- 2.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
- 3.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
- 4.Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. What is the resulting atomic weight?
- A.
18
- B.
8
- C.
10
- D.
16
- 5.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
- 6.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
- 7.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
- 8.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
- 9.An electrical insulator can be made a conductor
- A.
By heating it
- B.
By cooling it
- C.
By ionizing it
- D.
By oxidizing it
- 10.Of the following substances, the worst conductor is
- A.
Air
- B.
Copper
- C.
Iron
- D.
Salt water
- 11.Movement of holes in a semiconductor
- 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,
- 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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