ECAT Pre General Science Physics Online Test With Answers

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ECAT Pre General Science Physics Online Test

Sr. # Questions Answers Choice
1 Resistance of a conductor depends upon the quantity of current passing through it the voltage applied between its end its dimensions, physical state and nature of its material all of the above
2 The potential difference across each resistance in series combination is same different zero none of these
3 Magnetic effect at a point caused due to flow a current depend upon the Quantity of current Distance from current Both the quantity of current and distance from current element None of the all
4 The unit of resistance is volt ampere ohm coat
5 Physicist George Simon ohm was a German physical French physicist Chinese physicist Russian physicist
6 If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us parabola straight line hyper bola ellipse
7 What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts? 10<sup>-1</sup>A 10<sup>-2</sup>A 10<sup>-4</sup>A 1 mA
8 Resistor is a device which convert electric energy to Heat energy Chemical energy Elastic energy All of the above
9 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is one ohm one joule one volt one ampere
10 Ohm's law states that The current through a resistor is directly proportional to the applied voltage The voltage across a resistor is directly proportional to the current passing through it Resistance is the constant of proportionality between the voltage and current all of these
11 The electrode connected with the positive terminal of the current source is called cathode anode electrolyte position
12 The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as voltmeters resistance electrode current
13 Ohm established a relation between voltage and resistance voltage and charge voltage and current voltage resistance and charge
14 The ohm's is defined as 1 ampere / 1 volts 1 coulomb / 1 volt 1 volt / 1 ampere 1 volt / 1 coulomb
15 The relation V = IR represents Ampere law Faraday's law Ohm's law Len's law
16 Ohm is the unit of current capacitance energy resistance
17 The graphical representation of ohm's law is hyperbola straight line ellipse parabola
18 In describing functions of digital systems, a closed switch will be shown as 0 1 low any one of these
19 Mathematical manipulation of the two quantized states can be best carried if they are represented by high - low yes - no on - off 0 - 1
20 A digital system deals with quantities or variables which have only one state only two discrete states three discrete states four discrete states
21 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
22 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is zero infinity one any one of these
23 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>
24 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>
25 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>
26 The value of output resistance of OP-AMOP is of the order of few ohms few hundred ohms several kilo ohms several mega ohms
27 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
28 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
29 The input resistance of the OP-AMP is the resistance between the (-) input and output (+) input and output (-) and (+) inputs between any inputs
30 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
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