Gibilisco:Chapter 1 - Basic Physical Concept
This is the MCQs for Gibilisco:CHAPTER 1 BASIC PHYSICAL CONCEPT
- 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.The volt is the standard unit of:
- A.
Current.
- B.
Charge.
- C.
Electromotive force.
- D.
Resistance.
- 4.A coil has 500 turns and carries 75 mA of current. The magnetomotive force will be:
- A.
37,500 At.
- B.
. 375 At.
- C.
37.5 At.
- D.
3.75 At.
- 5.A ferromagnetic material:
- A.
Concentrates magnetic flux lines within itself.
- B.
Increases the total magnetomotive force around a current-carrying wire.
- C.
Causes an increase in the current in a wire.
- D.
Increases the number of ampere-turns in a wire.
- 6.Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting atomic weight is about:
- A.
8
- B.
10
- C.
16
- D.
18
- 7.An isotope:
- A.
Is electrically neutral.
- B.
Has positive electric charge.
- C.
Has negative electric charge.
- D.
Might have either a positive or negative charge.
- 8.If a material has low resistance:
- 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.
- 9.In a compound:
- A.
There can be just 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.
- 10.A molecule:
- A.
Might consist of just a single atom of an element.
- B.
Must always contain two or more elements.
- C.
Always has two or more atoms.
- D.
Is always electrically charged.
- 11.An electrical insulator can be made a conductor:
- A.
By heating.
- B.
By cooling.
- C.
By ionizing.
- D.
By oxidizing.
- 12.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.
- 13.Of the following substances, the worst conductor is:
- A.
Air.
- B.
Copper.
- C.
Iron.
- D.
Salt water.
- 14.A backwards-working electric motor 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 generator.
- 15.If an EMF of one volt is placed across a resistance of two ohms, then the current is:
- A.
Half an ampere.
- B.
One ampere.
- C.
Two amperes.
- D.
One ohm.
- 16.In some batteries, chemical energy can 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 have to throw it away.
- 17.An ion:
- A.
Is electrically neutral.
- B.
Has positive electric charge.
- C.
Has negative electric charge.
- D.
Might have either a positive or negative charge.
- 18.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.
- 19.Of the following substances, the best conductor is:
- A.
Air.
- B.
Copper.
- C.
Iron.
- D.
Salt water.
- 20.A coulomb:
- A.
Represents a current of one ampere.
- B.
Flows through a 100-watt light bulb.
- C.
Is one ampere per second.
- D.
Is an extremely large number of charge carriers.
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