Question # 1

The length of rotating vector (on a certain scale) represents the:

Choose an answer

Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

If the value of C in a series RLC circuit is increased, the resonant frequency

Choose an answer

Is not affected

Increase

Remains the same

Decreases

When the pn-junction is forward biased. the current flows through it is of the order of

Choose an answer

mili-amperes

amperes

nano-amperes

micro-amperes

The Instantaneous value of alternative current maybe:

Choose an answer

The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

The sum of positive and negative peak values is called:

Choose an answer

Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

Alternating current can induce voltage because it has a

Choose an answer

High peak value

Varying magnetic field

Stronger field than direct curren

Constant magnetic field

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Choose an answer

2nd group

fourth group

fifth group

sixth group

The bridge circuit of full wave rectification uses

Choose an answer

one diode

two diode

three diode

four diode

During the positive half-cycle in the half-wave rectification,the diode

Choose an answer

does not conduct

conducts

either of these

neither of these

The wave form of alternating voltage is the graph between:

Choose an answer

Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

For the normal operation of the transistor, its

Choose an answer

emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The power factor of resonant series circuit is

Choose an answer

1

0

-1

0.5

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Choose an answer

Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

During each cycle, alternating voltage reaches a peak value

Choose an answer

One time

Two times

Four times

A number of times depending on the frequency

The average of A.C. current and voltage over a complete cycle is

Choose an answer

Maximum

zero

Neither zero nor maximum

None of these

At higher frequency of the alternating current, the capacitive reactance X_c

Choose an answer

Increases

Decreases

Remains the same

Increases only when the voltage increases

Alternating current is produced by a voltage source which polarity:

Choose an answer

Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

The value of the input resistance of OP-AMP is of the order of

Choose an answer

few ohms

few hundred ohms

several kilo ohms

several maga ohms

The value of output resistance of OP-AMOP is of the order of

Choose an answer

few ohms

few hundred ohms

several kilo ohms

several mega ohms

The entire wave form of sinusoidal voltage is actually a set of all the:

Choose an answer

Positive maximum value + V_oand negative maximum value -V_o

Posiotive maximum value +V_oand zero

Zero and negative maximum value -V_o

Any of these

None of these

A diode characteristic curve is a plot between

Choose an answer

current and time

voltage and time

voltage and current

forward voltage and reversed voltage

Electromagnetic waves transmit energy equal to

Choose an answer

1/2 mv²

m_oc²

hf/c

hf

Alternating current can be transmitted:

Choose an answer

To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

The output voltage of half wave rectification is in the form of

Choose an answer

a smooth curve

a smooth wave

pulses

all of the above

A signal is amplified at the output without any change of phase, if it is applied at the

Choose an answer

inverting input

non-inverting input

at any of the input

none of these

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Choose an answer

zero

small

large

very large

In which of the following components, pn-junction is used

Choose an answer

light emitting diode

photo diode

photo voltaic cell

all of these

In free space, the speed of electromagnetic waves is

Choose an answer

3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

The most common source of alternating voltage is:

Choose an answer

Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Choose an answer

3525.0 volts

35.35 volts

353.5 volts

3.535 volts

OP-AMP has the following input terminals

Choose an answer

one

two

three

four

More Classes

Other Links

ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer