Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

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