# NEET Online Exam: Physics Quiz!

48 Questions | Total Attempts: 821  Settings  .

• 1.
Alternating current can be defined as current that varies in
• A.

Amplitude and direction

• B.

Magnitude and phase

• C.

Amplitude and time

• D.

time and phase

• 2.
Before a 120-volt dc source can be used to power a 12-volt load, the voltage must be reduced. Which of the following methods can be used?
• A.

A resistor placed in parallel with the load

• B.

A resistor placed in series with the load

• C.

A step-down transformer placed in series with load

• D.

A step-down transformer placed in parallel-with the load

• 3.
Alternating current has replaced direct current in modern transmission systems because it has which of the following advantages?
• A.

Ac can be transmitted with no line loss

• B.

Ac can be transmitted at higher current levels

• C.

Ac can be transmitted at lower voltage levels

• D.

Ac can be readily stepped up or down

• 4.
A waveform is a graphic plot of what quantities?
• A.

Current versus time

• B.

Amplitude versus time

• C.

Voltage versus amplitude

• D.

Magnitude versus amplitude

• 5.
Which of the following properties surrounds a current-carrying conductor?
• A.

A magnetic field

• B.

A repulsive force

• C.

An attractive force

• D.

An electrostatic field

• 6.
Which of the following statements accurately describes the magnetic field surrounding a current-carrying conductor?
• A.

It is parallel to and equal along all parts of the conductor

• B.

It is parallel to and maximum at the most negative part of the conductor

• C.

It is perpendicular to and equal along all parts of the conductor

• D.

It is perpendicular to the conductor and maximum at the most negative point of the conductor

• 7.
Which of the following factors determine(s) the intensity of a magnetic field surrounding a coil?
• A.

The amount of current flow through the coil

• B.

The type of core material

• C.

The number of turns in the conductor

• D.

All of the above

• 8.
When you grasp a coil in your left hand with your thumb pointing in the direction of the north pole, your fingers will be wrapped around the coil in the direction of the
• A.

Voltage potential

• B.

Magnetic field

• C.

Current flow

• D.

South pole

• 9.
The power consumed in a conductor in realigning the atoms which set up the magnetic field is known as what type of loss?
• A.

Hysteresis loss

• B.

Magnetic loss

• C.

Field loss

• D.

Heat loss

• 10.
The magnetic field surrounding a straight conductor is (a) what shape, and (b) is in what position relative to the conductor?
• A.

• B.

(a) Concentric circles (b) Parallel

• C.

• D.

(a) Concentric circles (b) Perpendicular

• 11.
Why is a two-pole magnetic field set up around a coil?
• A.

Because separate lines of magnetic force link and combine their effects

• B.

Because concentric lines of force cross at right angles and combine.

• C.

Because lines of force are separated and bent at the coil ends

• D.

Because separate lines of force are attracted to the two poles of the coi

• 12.
When a conductor is moving parallel to magnetic lines of force, (a) what relative number of magnetic lines are cut, and (b) what relative value of emf is induced?
• A.

(a) Minimum, (b) maximum

• B.

(a) Minimum, (b) minimum

• C.

(a) Maximum, (b) maximum

• D.

(a) Maximum, (b) minimum

• 13.
When the induced voltage in a conductor rotating in a magnetic field is plotted against the degrees of rotation, the plot will take what shape?
• A.

A circle

• B.

A sine curve

• C.

A square wave

• D.

A straight line

• 14.
When a loop of wire is rotated through 360º in a magnetic field, the induced voltage will be zero at which of the following points?
• A.

45º

• B.

90º

• C.

180º

• D.

270º

• 15.
When a loop of wire is rotated 360º in a magnetic field, at what points will the induced voltage reach its maximum (a) positive, and (b) negative values?
• A.

(a) 0º , (b) 180º

• B.

(a) 0º , (b) 270º

• C.

(a) 90º , (b) 180º

• D.

(a) 90º , (b) 270º

• 16.
When a coil of wire makes eight complete revolutions through a single magnetic field, (a) what total number of alternations of voltage will be generated and, (b) what total number of cycles of ac will be generated?
• A.

(a) 32, (b) 16

• B.

(a) 16, (b) 8

• C.

(a) 8, (b) 4

• D.

(a) 4, (b) 2

• 17.
According to the left-hand rule for generators, when your thumb points in the direction of rotation, your (a) forefinger and (b) your middle finger will indicate the relative directions of what quantities?
• A.

(a) Current, (b) Magnetic flux, south to north

• B.

(a) Current, (b) Magnetic flux, north to south

• C.

(a) Magnetic flux, south to north, (b) Current

• D.

(a) Magnetic flux, north to south, (b) Current

• 18.
Continuous rotation of a conductor through magnetic lines of force will produce what type of (a) voltage and (b) waveform?
• A.

(a) Ac, (b) sine wave

• B.

(a) Dc, (b) continuous level

• C.

(a) Ac, (b) sawtooth

• D.

(a) Dc, (b) pulsating wave

• 19.
What is the term for the number of complete cycles of ac produced in one second?
• A.

Period

• B.

Waveform

• C.

Frequency

• D.

Wavelength

• 20.
What is the unit of measurement for frequency?
• A.

Cycle

• B.

Hertz

• C.

Period

• D.

Maxwell

• 21.
A loop of wire rotating at 60 rpm in a magnetic field will produce an ac voltage of what frequency?
• A.

1 Hz

• B.

60 Hz

• C.

120 Hz

• D.

360 Hz

• 22.
An ac voltage of 250 hertz has a period of
• A.

0.004 second

• B.

0.025 second

• C.

0.4 second

• D.

2.5 seconds

• 23.
What is the approximate frequency of an ac voltage that has a period of .0006 second?
• A.

6 Hz

• B.

16.67 Hz

• C.

600 Hz

• D.

1667 Hz

• 24.
Component a is a measure of what quantity?
• A.

Frequency

• B.

Polarity

• C.

Amplitude

• D.

Time

• 25.
Component a differs from component b in which of the following characteristics.
• A.

Frequency

• B.

Polarity

• C.

Amplitude

• D.

Period

Related Topics Back to top