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

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

Question # 2

Which one of the following is correct?

Question # 3

In RLC series circuit, resonance occurs when

Question # 4

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

Question # 5

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

Question # 6

An A.C varies as a function of

Question # 7

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

Question # 8

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

Question # 9

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 10

The bridge circuit of full wave rectification uses

Question # 11

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

Question # 12

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 13

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 # 14

In a transistor, the central region is called

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
2 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
3 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
4 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
5 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
6 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
7 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
8 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
9 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
10 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these

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