ECAT Physics Chapter 12 Electrostatics Online Test With Answers

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ECAT Physics Chapter 12 Electrostatics Online Test

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1 A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is 10<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">μ</span>F 20<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">μ</span>F 30<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">μ</span>F 15<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">μ</span>F
2 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver? 108 g 10.8 g 0.8 g 108/0.8 g
3 In a voltmeter the conduction takes place due to Electrons only Holes only Electrons and holes Electrons and ions
4 A conducting wire is drawn to double its length. Final resistivity of the material will be Double of the original one Half of the original one One fourth of the original one Same as original one
5 A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be Zero 10<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span> 1<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span> 0.10<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span>
6 If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be 0.1 watt 1 watt 10 watt 100 watt
7 The conductivity of a superconductor is Infinite Very large Very small Zero
8 If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be 0.1 watt 1 watt 10 watt 100 watt
9 A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is Zero 0.5<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span> 1.1<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span> 5.0<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>Ω</b></span>
10 A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be 64 W 80 W 100 W 125 W
11 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes 2R 4R 16R Zero
12 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then R<sub>1</sub>= 2R<sub>2</sub> R<sub>2</sub>= 2R<sub>1</sub> R<sub>2 </sub>=<sub> </sub>4R<sub>1</sub> R<sub>1</sub>= 4R<sub>2</sub>
13 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts 1310 W 670 W 810 W 1210 W
14 5<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μF</b></span> 10<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μF</b></span> 3<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μF</b></span> 6<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μF</b></span>
15 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be 711<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μ</b></span>F 611<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μ</b></span>F 811<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μ</b></span>F 511<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);"><b>μ</b></span>F
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