ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test With Answers

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ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test

Sr. # Questions Answers Choice
1 The closed loop gain of the non-inverting amplifier is given by G = R<sub>2</sub>/R<sub>1</sub> G = -R<sub>2</sub>/R<sub>1</sub> G = 1 - R<sub>2</sub>/R<sub>1</sub> G = 1 + T<sub>2</sub>/R<sub>1</sub>
2 The closed loop gain of the inverting amplifier is written as G = R<sub>2</sub>/R<sub>1</sub> G = 1 + R<sub>2</sub>/R<sub>1</sub> G = -R<sub>2</sub>/R<sub>1</sub> G = 1 - R<sub>2</sub>/R<sub>1</sub>
3 The open loop gain of OP-AMP is of the order of 10<sup>2</sup> 10<sup>3</sup> 10<sup>4</sup> 10<sup>5</sup>
4 The value of output resistance of OP-AMOP is of the order of few ohms few hundred ohms several kilo ohms several mega ohms
5 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is zero small large very large
6 The value of the input resistance of OP-AMP is of the order of few ohms few hundred ohms several kilo ohms several maga ohms
7 The input resistance of the OP-AMP is the resistance between the (-) input and output (+) input and output (-) and (+) inputs between any inputs
8 A signal is amplified at the output without any change of phase, if it is applied at the inverting input non-inverting input at any of the input none of these
9 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at inverting input non-inverting input any one of the input terminal none of them
10 OP-AMP has the following input terminals one two three four
11 The amplifier which us used to perform mathematical operations electronically is known as calculator OP-AMP computer any one of them
12 When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the base and emitter collector and emitter base and collector any one of these
13 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its I<sub>c</sub>will decrease V<sub>CE</sub>will increase I<sub>C</sub>will increase V<sub>CC</sub>will increase
14 When the emitter-base junction of a transistor is reverse biased, collector current Reverses Increases Decreases Stops
15 The value of current gain of n-p-n transistor is of the order of tens hundreds thousands ten thousands
16 For a n-p-n transistor, the conventional current equation can be written as I<sub>E</sub>+ I<sub>C</sub>= I<sub>B</sub> I<sub>C</sub>- I<sub>B</sub>= I<sub>E</sub> I<sub>C</sub>+ I<sub>B</sub>= I<sub>E</sub> I<sub>B</sub>+ I<sub>E</sub>= I<sub>C</sub>
17 In a normally biased n-p-n transistor, an electron c current IEflows from the emitter into the base collector into the base base into collector none of these
18 In n-p-n transistor, emitter base junction is kept reversed forward biased may be reversed or may be forward biased none of these
19 For normal operation of transistor, the batteries V<sub>CC</sub>is of much lower value than V<sub>BB</sub> V<sub>CC</sub>is of much higher value than V<sub>BB</sub> V<sub>CC is equal to</sub>V<sub>BB</sub> none of these
20 For the normal operation of the transistor, its emitter-base and collector base junctions are forward biased emitter-base junction is reversed biased and collector base junction is forward biased emitter-base junction is forward biased and collector-base junction is reverse biased any one of these
21 Which of the following has a great concentration of impurity base emitter collector none of these
22 In a transistor, the central region is called collector emitter base none of them
23 In a transistor, if the central region is n-type, then this type of transistor is known as n-p-n transistor p-n-p transistor either of these none of these
24 In a transistor, if the central region is p-type then this type of transistor is known as p-n-p transistor n-p-n transistor either of these none of these
25 Which of the following diodes can operate in the reverse biased condition photo diode light emitting diode photo voltaic cell none of these
26 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit photo diode light emitting diode photo voltaic cell none of these
27 Which of the following diode is used for the detection of light photo diode light emitting diode photo voltaic cell all of them
28 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted. photo diode light emitting diode photo voltaic cell all of them
29 In which of the following components, pn-junction is used light emitting diode photo diode photo voltaic cell all of these
30 The circuit which is used to smooth the output voltage of the full-wave rectification is known as transformer rectifier filter none of these
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