ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

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

Question # 2

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

Question # 3

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

Question # 4

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 5

The wave form of alternating voltage is the graph between:

Question # 6

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

Question # 7

Which of the following diode is used for the detection of light

Question # 8

The RMS value of alternating current is:

Question # 9

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 10

Peak value of alternative current is:

Question # 11

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

Question # 12

The magnitude of alternative voltage V:

Question # 13

The basic circuit element in A.C. circuits are:

Question # 14

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 15

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

Question # 16

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

Question # 17

The waveform of alternating voltage is a:

Question # 18

Which of the following has a great concentration of impurity

Question # 19

The basic circuit element in D.C. circuit is:

Question # 20

Which one of the following is correct?

Question # 21

The most common source of alternating voltage is:

Question # 22

An A.C varies as a function of

Question # 23

Average value of A.C voltage during one cycle is

Question # 24

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

Question # 25

The closed loop gain of the non-inverting amplifier is given by

Question # 26

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 # 27

For normal operation of transistor, the batteries

Question # 28

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

Question # 29

The phase at the positive peak of an A.C. cycle is:

Question # 30

In frequency modulation (FM), the carrier waves amplitude

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
2 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
3 In n-p-n transistor, emitter base junction is kept
A. reversed
B. forward biased
C. may be reversed or may be forward biased
D. none of these
4 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
5 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
6 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
7 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
8 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
9 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
10 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them

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