ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 In describing functions of digital systems, a closed switch will be shown as 0 1 low any one of these
2 Mathematical manipulation of the two quantized states can be best carried if they are represented by high - low yes - no on - off 0 - 1
3 A digital system deals with quantities or variables which have only one state only two discrete states three discrete states four discrete states
4 Most OP-AMP operates with <u>+</u> 6 V supply <u>+</u> 10 V supply <u>+</u> 12 V supply <u>+</u> 24 V supply
5 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is zero infinity one any one of these
6 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>
7 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>
8 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>
9 The value of output resistance of OP-AMOP is of the order of few ohms few hundred ohms several kilo ohms several mega ohms
10 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
11 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
12 The input resistance of the OP-AMP is the resistance between the (-) input and output (+) input and output (-) and (+) inputs between any inputs
13 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
14 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
15 OP-AMP has the following input terminals one two three four
16 The amplifier which us used to perform mathematical operations electronically is known as calculator OP-AMP computer any one of them
17 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
18 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
19 When the emitter-base junction of a transistor is reverse biased, collector current Reverses Increases Decreases Stops
20 The value of current gain of n-p-n transistor is of the order of tens hundreds thousands ten thousands
21 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>
22 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
23 In n-p-n transistor, emitter base junction is kept reversed forward biased may be reversed or may be forward biased none of these
24 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
25 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
26 Which of the following has a great concentration of impurity base emitter collector none of these
27 In a transistor, the central region is called collector emitter base none of them
28 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
29 A process is a reversible process, if the entropy of the system increases decreases remains constant none of them
30 The disorder in the system increases due to the removal of heat addition of heat removal or addition of heat none of them
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