ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Try The 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

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

Question # 2

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

Question # 3

In frequency modulation (FM), the carrier waves amplitude

Question # 4

Conversion of alternating current into direct current is called

Question # 5

The impedance of RLC series resonance circuit at resonant frequency is

Question # 6

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

Question # 7

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 8

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 9

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

Question # 10

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

Question # 11

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 12

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

Question # 13

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

Question # 14

In a transistor, the central region is called

Question # 15

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

Question # 16

Which of the following has a great concentration of impurity

Question # 17

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

Question # 18

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

Question # 19

The amplifier which us used to perform mathematical operations electronically is known as

Question # 20

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

Question # 21

The total reactance of a series RLC circuit at resonance is

Question # 22

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

Question # 23

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

Question # 24

SI unit of impedance is

Question # 25

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

Question # 26

For the normal operation of the transistor, its

Question # 27

Alternating current is produced by a voltage source which polarity:

Question # 28

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

Question # 29

Which one of the following waves belongs to electromagnetic spectrum

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
2 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
3 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
4 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
5 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
6 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
7 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
8 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
9 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
10 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these

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