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 highest value reached by the voltage or current:

Question # 2

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 # 3

The wave form of alternating voltage is the graph between:

Question # 4

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

Question # 5

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

Question # 6

A P-N juction or semiconductor diode cannot be used as

Question # 7

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

Question # 8

In half wave rectification

Question # 9

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 10

A diode characteristic curve is a plot between

Question # 11

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

Question # 12

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

Question # 13

Which one of the following waves belongs to electromagnetic spectrum

Question # 14

The waveform of alternating voltage is a:

Question # 15

At resonance, the phase angle for RLC series resonance circuit equals

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
2 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
3 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
4 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
5 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
6 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
7 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
8 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
9 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
10 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts

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