# Gibilisco:Chapter 1 - Basic Physical Concept

20 Questions | Total Attempts: 349  Settings  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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