# 2A672 Code 6 Volume 1 UREs Complete

88 Questions | Attempts: 324
Share  Settings  Code 6 UREs volume 1 is a quiz testing your knowledge on different concepts in Physics. The topics tested vary from atomic structure, energy just to mention but a few. Take it up and see how good you are.

• 1.
What is the simplest form of matter?
• A.

Element

• B.

Mixture

• C.

Electrons

• D.

Compound

• 2.
In an atom, what electrons contain the most energy?
• A.

The energy is shared equal by all electrons

• B.

Orbiting electrons

• C.

Valance electrons

• D.

K shell electrons

• 3.
If there are 8 electrons in the outer most shell of an atom, then it is considered
• A.

Complete

• B.

Unstable

• C.

Charged

• D.

Stable

• 4.
Atoms having more than four electrons, but less than eight are known as
• A.

Insulators

• B.

Conductors

• C.

Stable atoms

• D.

Semiconductors

• 5.
The electrostatic fields around a positive ion move
• A.

Inward

• B.

Outward

• C.

Inward, then outward

• D.

Outward, then inward

• 6.
The force required to move free electrons through a conductor is known as
• A.

Current

• B.

Voltage

• C.

Negative charge

• D.

Electrostatic force

• 7.
What are factors that affect the resistance of a material?
• A.

Area, weight, and state of material

• B.

Area, temperature, and type of material

• C.

Temperature, weight and state of material

• D.

Temperature, type of material, and state of material

• 8.
What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?
• A.

40 ohms

• B.

20 ohms

• C.

10 ohms

• D.

0.5 ohms

• 9.
in a series-parallel circuit, find RT if series resistor R1= 7 ohms, and parallel resistors R2 and R3= 8 ohms.
• A.

23 ohms

• B.

15 ohms

• C.

11 ohms

• D.

8 ohms

• 10.
In a series-parallel circuit, the series current at I1=9 amps; in the two parallel branches, I2= 5amps; and thevalue of I3 is not listed.  Use Ohm's law to find the value of I3 and IT.
• A.

I3= 4amps and IT= 14 amps

• B.

I3=4 amps and IT=9amps

• C.

I3=4 amps and IT=18 amps

• D.

Not enough information to solve

• 11.
In a series-parallel circuit, total voltage is 12 volts, the value of E1 in the series portion of the circuit is unknown.  There are two parallel branches (E2=3volts) and the value of E3 in the second parallel branch is unknown.  Using Ohm's law, find the value of E1 and E3.
• A.

E3= 9 volts and E1= 12 volts

• B.

E3= 9 volts and E1 = 3 volts

• C.

E3= 3 volts and E1= 6 volts

• D.

E3= 3 volts and E1= 9 volts

• 12.
What is the difference between an open and a short?
• A.

An open causes resistance to decrease; a short causes resistance to increase

• B.

Excessive current flow in an open circuit; no current flow in a shorted component

• C.

No current flow in an open circuit; excessive current flow in a shorted component

• D.

Minimum voltage development across the open component; maximum voltage development across the shorted component

• 13.
When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as
• A.

Magnetism

• B.

Reluctance

• C.

Direct current

• D.

Electromagnetic induction

• 14.
In an inductive circuit, what is meant by current lags voltage by 90 degrees?
• A.

Current is zero when voltage is zero; voltage is maximum when current is maximum

• B.

Current is maximum when voltage is zero; voltage is maximum when current is zero

• C.

If current decreases, voltage aids in the decrease

• D.

If current increases, voltage aids the increase

• 15.
What is the basic principle of operation of transformers?
• A.

Mutual induction

• B.

Magnetic induction

• C.

Counterelectromotive force

• D.

Primary and secondary induction

• 16.
What transformer winding acts as a conductor and provides the path into which voltage is induced?
• A.

Field

• B.

Primary

• C.

Secondary

• D.

Stationary

• 17.
If the size of the plates of a capacitor is increased, how is capacitance affected?
• A.

Capacitance increases

• B.

Capacitance decreases

• C.

Electrons distorted and scattered

• D.

Electrostatic force between the plates decreases

• 18.
What statement best describes a capacitive circuit?
• A.

Current leads voltage by 90 degrees

• B.

Applied voltage leads current by 90 degrees

• C.

Has the ability to conduct in one direction and not the other

• D.

Has the ability to conduct in all directions when gated or discharged

• 19.
In what type of circuit(s) does a capacitor oppose any change in voltage
• A.

Alternating current (AC) and direct current (DC)

• B.

Pulsating DC

• C.

Pure DC

• D.

AC

• 20.
What statement best describes a diode
• A.

Is a five-terminal device

• B.

Is a three-terminal device

• C.

Has the ability to conduct in one direction and not the other

• D.

Has the ability to conduct in all directions when gated or discharged

• 21.
What are the minority carriers in P-type material?
• A.

Holes

• B.

Protons

• C.

Neutrons

• D.

Electrons

• 22.
The area of a semiconductor where P-type material is joined to N-type material is known as
• A.

Dielectric region

• B.

Depletion region

• C.

Depletion field

• D.

PN region

• 23.
A junction diode has how many PN junction(s)?
• A.

1

• B.

2

• C.

3

• D.

4

• 24.
If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is
• A.

Not allowing current to flow

• B.

Forward biased

• C.

Reverse biased

• D.

Turned on

• 25.
In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating cuurent (AC)?
• A.

4

• B.

3

• C.

2

• D.

1

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