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 pn-junction is in reversed biased, current flows through the junction due to the

Question # 2

The open loop gain of OP-AMP is of the order of

Question # 3

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

Question # 4

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

Question # 5

In series RC circuit when R=Xc, then the phase angle is

Question # 6

The magnitude of alternative voltage V:

Question # 7

Which one of the following is correct?

Question # 8

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

Question # 9

In half wave rectification

Question # 10

At resonance, the impedance of RLC series circuit is

Question # 11

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

Question # 12

Alternating current is produced by a voltage source which polarity:

Question # 13

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

Question # 14

Which one of the following waves belongs to electromagnetic spectrum

Question # 15

The power factor of resonant series circuit is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
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 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
5 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
6 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
7 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
8 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
9 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
10 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b

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