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

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 2

Alternating current can be transmitted:

Question # 3

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

Question # 4

Alternating current is produced by a voltage source which polarity:

Question # 5

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

Question # 6

Most OP-AMP operates with

Question # 7

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

Question # 8

Which of the following has a great concentration of impurity

Question # 9

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 10

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

Question # 11

Which one of the following waves belongs to electromagnetic spectrum

Question # 12

Chock consumes externally small

Question # 13

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

Question # 14

Average value of A.C voltage during one cycle is

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
2 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
3 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
4 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
5 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
6 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
7 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
8 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
9 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
10 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms

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