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 phase angle of a series RLC circuit at resonance is

Question # 2

The basic circuit elements of A.C circuit are

Question # 3

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

Question # 4

Which of the following has a great concentration of impurity

Question # 5

Which one of the following waves belongs to electromagnetic spectrum

Question # 6

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

Question # 7

The Instantaneous value of alternative current maybe:

Question # 8

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

Question # 9

For a n-p-n transistor, the conventional current equation can be written as

Question # 10

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 11

In frequency modulation (FM), the carrier waves amplitude

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

In free space, the speed of electromagnetic waves is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
2 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
3 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
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 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
6 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
7 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
8 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
9 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
10 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)

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