Gibilisco:Chapter 1 - Basic Physical Concept

20 Questions | By Froydwess | Last updated: Mar 22, 2022 | Total Attempts: 438

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This is the MCQs for Gibilisco:CHAPTER 1 BASIC PHYSICAL CONCEPT

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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.

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.