Question # 1

In a transistor, if the central region is n-type, then this type of transistor is known as

Choose an answer

n-p-n transistor

p-n-p transistor

either of these

none of these

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)

A P-N juction or semiconductor diode cannot be used as

Choose an answer

A rectifier

Detector

Oscillator

An amplifier

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

The value of the potential difference across the depletion region for the case of germanium is

Choose an answer

0.3 V

0.5 V

0.7 V

0.9 V

At resonance, the impedance of RLC series circuit is

Choose an answer

Maximum

Zero

Minimum

Determinate

Average value of A.C voltage during one cycle is

Choose an answer

1

Zero

Maximum

Variable

The most common source of alternating voltage is:

Choose an answer

Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

The device which allows only the flow of an A.C. through a circuit is

Choose an answer

Capacitor

Inductor

D.C. motor

Battery

For normal operation of transistor, the batteries

Choose an answer

V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of these

The time interval during which the Voltage source changes its polarity once is known as:

Choose an answer

Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Choose an answer

photo diode

light emitting diode

photo voltaic cell

all of them

Most OP-AMP operates with

Choose an answer

+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

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

The alternative voltage of current is actually measured by:

Choose an answer

Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Which of the following has a great concentration of impurity

Choose an answer

base

emitter

collector

none of these

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

Choose an answer

emitter into the base

collector into the base

base into collector

none of these

When the pn-junction is connected reversed biased, its resistance is of the order of

Choose an answer

few ohms

few kilo-ohms

few mega-ohms

few mili-ohms

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Choose an answer

9.4 kHz

940 kHz

94 kHz

None of these

In describing functions of digital systems, a closed switch will be shown as

Choose an answer

0

1

low

any one of these

More Classes

Other Links

ECAT 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