# physics correctec questions

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Physics

Science

### A body at rest or in uniform motion remains in the same state unless a force is applied describes what

Newtons 1st law of motion

Force

Inertia

### What is inertia

It is the tendency of a body to remain at rest or stay in motion unless acted upon by an external force

### What is the formula for Newtons 2nd Law

F=ma ( Force= (mass)(acceleration) )

Meter

Kilogram

### What are the fundamental metric units of physics

Meters, Kg, and seconds

Density

Molecule

5/9(F-32)

### Convert 68*F to degrees Centigrade

20* 5/9(68-32)=20

2.2

Water

2.54

100

10 billion

Force

Newton

Work

### What is the definition of energy

The ability to do work

Kinetic energy

Potential

Mega

mA

### What is the definition of power

The rate of which work is done

### What law states that energy cannot be created or destroyed only changed

Law of Conservation of Energy

Watt

1,000

100

Velocity

### What are the two kinds of electrical charges

Positive and Negative

Coulomb

### What are the three methods of electrification

Friction, Contact, Induction

4 times

Volts

### What determines the quantity of electrons that can be stored in a capacitor

The area of the plates, the distance between the plates and the material between the plates

Ground

1 electron volt

Capacitor

1 joule/coulomb

Amperage

Voltage

Conductor

Increases

Current

Ampere

Voltage

Direct

Ammeter

Q/T

### What will create the most electrical resistance

Long wire small diameter

Copper

Insulator

Ohms law

Ohm

8 volts

22 ohms

### What is true concerning series circuits

Amperes remains constant throughout

12

### What is the main advantage of a parallel circuit

Independence of the branches

Side by side

### What is true concerning a voltmeter

It must be connected in parallel

Circuit breaker

Rheostat

Watt

P=VI

Outer surface

### What is the most efficient means of transporting electrical energy

High voltage and low amperage

28,000 watts

Magnet

North and South

Flux lines

### Which of the following determines the strength of a magnetic field

The number of flux lines

### How would cutting the distance between two magnets in half, effect the attraction force between them

It would increase four times

### In which direction do magnetic flux lines travel

North pole to south pole

Magnetic field

Oersted

### Which of the following happens when a current and conductor increases

Magnetic field strength increases

### Which of the following rules will determine the direction of the magnetic field around an electrical current

A left hand thumb rule

Clockwise

Helix

Solenoid

Electromagnet

Ferromagnetic

Non magnetic

Parramagnetic

Repel

Diamagnetic

Permeability

### How will the north pole and south pole of two magnets affect each other

They will attract

### Which of the following rules will determine the direction of force on a current carrying wire

The right hand rule

Motor

### Which of the following happens when a wire moves through a magnetic field

An electromotive force is induced in the wire

90 degrees

retentivity

### How can voltage be induced into a conductor : Move a wire through a magnetic field, Move a magnetic field across a wire, Place a wire in a varying magnetic field

(answer is: 1,2 &3) *Michael Feraday discovered that electricity could be produced by any of the above methods.

Generator.

Motor

Mutual induction

### What type of transformer has more turns of wire in the secondary side than primary side

Step-up transformer

Shell type

Turns of wire

Shell type

95%

Decreases

### As magnetic domains rearrange in a transformer, heat is produced. What is this energy loss called

Hysteresis losses

Soft iron

Eddy Currents

Power loss

Lamination

Frequency

120

### How are alternating current values usually expressed

RMS (root mean square) values

### What is the major reason for using alternating current

Transformers cannot operate without it.

Alternating

Impedance

50 kV

22 V

70.7 kv

Rectification

Circuit

Semiconductor

N type

### Which of the following is not an advantage of solid state rectifiers over valve tubes

Melting point is lower in silicon

Full wave

Line voltage

### What controls the incoming voltage to the auto transformer

Main breaker switch

Electronic timer

Autotransformer

KVP selector

### If the line voltage changes because of demands by other users, adjustments must be made in which of the following

Voltage compensator

X-ray tube

Rheostat

Breaker switch

### Where in the x-ray circuit is the timer located

Between the autotransformer and the step up transformer

High frequency

### The spinning top test can be used to determine the accuracy of which of the following

Rectification circuit

Alternating

Rheostat

150

Milliameter

12

### Which of the following types of current supplies the x-ray tube

Pulsating direct current

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