ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 2

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

Question # 3

For normal operation of transistor, the batteries

Question # 4

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 5

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

Question # 6

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 7

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

Question # 8

The bridge circuit of full wave rectification uses

Question # 9

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 10

Which of the following diodes can operate in the reverse biased condition

Question # 11

OP-AMP has the following input terminals

Question # 12

The most common source of alternating voltage is:

Question # 13

Alternating current can be transmitted:

Question # 14

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

Question # 15

For the normal operation of the transistor, its

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
2 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
3 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
4 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
5 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
6 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
7 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
8 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
9 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
10 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them

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