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Current Electricity

110 questions · Physics · NEET
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Current Electricity

110 questions · Physics · NEET

  1. The current passing through the battery in the given circuit, is: Includes diagram2025 · Q141 · MCQ
  2. A wire of resistance R is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the…2025 · Q169 · MCQ
  3. A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is: Includes diagram2025 · Q176 · MCQ
  4. The terminal voltage of the battery, whose emf is 10 V and internal resistance 1Ω, when connected through an external resistance of 4Ω as shown in the figure is: Includes diagram2024 · Q154 · MCQ
  5. A wire of length 'l' and resistance 100Ω is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series. The…2024 · Q156 · MCQ
  6. Two heaters A and B have power rating of 1 kW and 2 kW, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:2024 · Q189 · MCQ
  7. Choose the correct circuit which can achieve the bridge balance.2024 · Q192 · MCQ
  8. A uniform wire of diameter d carries a current of 100 mA when the mean drift velocity of electrons in the wire is v. For a wire of diameter 2d​ of the same material to carry a current of 200 mA, the…2024 · Q162 · MCQ
  9. A uniform metal wire of length l has 10Ω resistance. Now this wire is stretched to a length 2l and then bent to form a perfect circle. The equivalent resistance across any arbitrary diameter of that circle is2024 · Q171 · MCQ
  10. The given circuit shows a uniform straight wire AB of 40 cm length fixed at both ends. In order to get zero reading in the galvanometer G, the free end of J is to be placed from B at: Includes diagram2024 · Q196 · MCQ
  11. A certain wire A has resistance 81 Ω. The resistance of another wire B of same material and equal length but of diameter thrice the diameter of A will be :2023 · Q140 · MCQ
  12. A copper wire of radius 1 mm contains 1022 free electrons per cubic metre. The drift velocity for free electrons when 10 A current flows through the wire will be (Given, charge on electron =1.6×10−19C…2023 · Q161 · MCQ
  13. The emf of a cell having internal resistance 1Ω is balanced against a length of 330 cm on a potentiometer wire. When an external resistance of 2Ω is connected across the cell, the balancing length will be :2023 · Q170 · MCQ
  14. The magnitude and direction of the current in the following circuit is :- Includes diagram2023 · Q125 · MCQ
  15. If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by: Includes diagram2023 · Q126 · MCQ
  16. Resistance of a carbon resistor determined from colour codes is (22000±5%)Ω. The colour of third band must be :2023 · Q143 · MCQ
  17. The resistance of platinum wire at 0∘C is 2 Ω and 6.8 Ω at 80∘C. The temperature coefficient of resistance of the wire is :2023 · Q167 · MCQ
  18. 10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased n times. The value of…2023 · Q169 · MCQ
  19. The reciprocal of resistance is :2022 · Q140 · MCQ
  20. A cell of emf 4 V and internal resistance 0.5 Ω is connected to a 7.5 Ω external resistance. The terminal potential difference of the cell is2022 · Q151 · MCQ
  21. The equivalent resistance of the infinite network given below is : Includes diagram2022 · Q160 · MCQ
  22. The sliding contact C is at one fourth of the length of the potentiometer wire (AB) from A as shown in the circuit diagram. If the resistance of the wire AB is R0, then the potential drop (V) across the resistor R is Includes diagram2022 · Q183 · MCQ
  23. Two resistors of resistance, 100 Ω and 200 Ω are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in 100 Ω to that in 200 Ω in a given time is2022 · Q149 · MCQ
  24. A copper wire of length 10 m and radius (π​10−2​) m has electrical resistance of 10 Ω. The current density in the wire for an electric field strength of 10 (V/m) is2022 · Q155 · MCQ
  25. A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q Includes diagram2022 · Q171 · MCQ
  26. In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?2021 · Q138 · MCQ
  27. The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25Ω. What will be the effective resistance if they are connected in series?2021 · Q140 · MCQ
  28. Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match column-I and column-II with appropriate relations. Includes table2021 · Q158 · MCQ
  29. Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio i1​i3​​ of currents in terms of resistances used in the circuit is : Includes diagram2021 · Q162 · MCQ
  30. A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3:2. If the length of the resistance wire is 1.5 m, then the length of…2020 · Q128 · MCQ
  31. The color code of a resistance is given below : The values of resistance and tolerance, respectively, are Includes diagram2020 · Q135 · MCQ
  32. A charged particle having drift velocity 7.5×10-4 ms-1 in an electric field of 3×10-10 Vm-1 has a mobility in m2 V-1s-1 of :2020 · Q139 · MCQ
  33. Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper?2020 · Q147 · MCQ
  34. The solids which have the negative temperature coefficient of resistance are :2020 · Q159 · MCQ
  35. Which of the following acts as a circuit protection device?2019 · Q131 · MCQ
  36. Six similar bulbs are connected as shown in the figure with a DC source of emf E, and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one… Includes diagram2019 · Q142 · MCQ
  37. In the circuits shown below, the readings of voltmeters and the ammeters will be : Includes diagram2019 · Q144 · MCQ
  38. A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be2018 · Q118 · MCQ
  39. A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the…2018 · Q119 · MCQ
  40. A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then the current drawn from…2018 · Q120 · MCQ
  41. The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be2017 · Q126 · MCQ
  42. A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves2017 · Q127 · MCQ
  43. A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10…2016 · Q120 · MCQ
  44. The charge flowing through a resistance R varies with time t is Q = at − bt2, where a and b are positive constants. The total heat produced in R is2016 · Q121 · MCQ
  45. The potential difference (VA − VB) between the points A and B in the given figure is Includes diagram2016 · Q121 · MCQ
  46. A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is2016 · Q122 · MCQ
  47. Two metal wires of identical dimensions are connected in series. If σ1 and σ2 are the conductivity of the combination is2015 · Q113 · MCQ
  48. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be2015 · Q114 · MCQ
  49. A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by2015 · Q115 · MCQ
  50. Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is2015 · Q117 · MCQ
  51. A, B and C are voltmeters of resistance R, 1.5 R and 3R respectively as shown in the figure. When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively, Then Includes diagram2015 · Q118 · MCQ
  52. A potentiometer wire has length 4 m and resistance 8 Ω. The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is2015 · Q119 · MCQ
  53. The resistances in the two arms of the meter bridge are 5 Ω and RΩ respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6l1. The resistance R is Includes diagram2014 · Q121 · MCQ
  54. A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4…2014 · Q122 · MCQ
  55. Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 Ω. The power loss in the wire is2014 · Q123 · MCQ
  56. Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity of 1.7 × 10−6 ohm-centimeter, the other is of iron with a resistivity of… Includes diagram2013 · Q124 · MCQ
  57. A 12 cm wire is given a shape of a right angled triangle ABC having sides 3 cm, 4 cm and 5 cm as shown in the figure. The resistance between two ends (AB, BC, CA) of the respective sides are measuread one by one ratio Includes diagram2013 · Q125 · MCQ
  58. Ten identical cells connected in series are needed to heat a wire of length one meter and radius 'r' by 10oC in time 't'. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in…2013 · Q126 · MCQ
  59. The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance…2013 · Q123 · MCQ
  60. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is2013 · Q124 · MCQ
  61. A wire of resistance 4 Ω is stretched to twice its original length. The resistance of stretched wire would be2013 · Q125 · MCQ
  62. A cell having an emf ε and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by2012 · Q81 · MCQ
  63. The power dissipated in the circuit shown in the figure is 30 watts. The value of R is Includes diagram2012 · Q93 · MCQ
  64. If voltage across a bulb rated 220 volt-100 watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is2012 · Q144 · MCQ
  65. In the circuit shown the cells A and B have negligible resistances. For VA = 12 V, R1 = 500 Ω and R = 100 Ω the galvanometer (G) shows no deflection. The value of Vs is Includes diagram2012 · Q174 · MCQ
  66. A ring is made of a wire having a resistance R0 = 12 Ω. Find the points A and B, as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these point is… Includes diagram2012 · Q175 · MCQ
  67. A thermocouple of negligible resistance produces an e.m.f. of 40 µV/ºC in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 µA/division, is employed with the thermocouple. The smallest value of…2011 · Q80 · MCQ
  68. In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is Includes diagram2011 · Q95 · MCQ
  69. A current of 2 A flows through a 2 Ω resistor when connected across a battery a 2 Ω resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 Ω resistor. The…2011 · Q165 · MCQ
  70. If power dissipated in the 9 Ω resistor in the circuit shown is 36 watt, the potential difference across the 2 Ω resistor is Includes diagram2011 · Q166 · MCQ
  71. A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between… Includes diagram2010 · Q140 · MCQ
  72. Consider the following two statements. (A) Kirchoff's junction law follows from the conservation of charge. (B) Kirchhoff's loop law follows from the conservation of energy. Which of the following is correct?2010 · Q152 · MCQ
  73. See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ? Includes diagram2009 · Q131 · MCQ
  74. A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is Includes diagram2009 · Q132 · MCQ
  75. The mean free path of electrons in a metal is 4 × 10−8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m2009 · Q133 · MCQ
  76. A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then…2009 · Q134 · MCQ
  77. An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20oC ? The temperature of boiling water is 100oC2008 · Q125 · MCQ
  78. A current of 3 amp. flows through the 2 Ω resistor shown in the circuit. The power dissipated in the 5 Ω resistor is Includes diagram2008 · Q126 · MCQ
  79. A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 Ω. Its internal resistance is2008 · Q127 · MCQ
  80. A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively2008 · Q136 · MCQ
  81. In the circuit shown, the current through the 4 Ω resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference betwen the points M and N is Includes diagram2008 · Q167 · MCQ
  82. The total power dissipated in watt in the circuit shown here is Includes diagram2007 · Q110 · MCQ
  83. Three resistances, P, Q, R each of 2Ω and an unknown resistance S from the four arms of a Wheatstone bridge circuit. When a resistance of 6 Ω is connected in parallel to S the bridge gets balanced. What is the value of S?2007 · Q111 · MCQ
  84. In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will Includes diagram2006 · Q131 · MCQ
  85. Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r1 and r2 (r1 > r2) respectively. When the circuit is closed, the potential difference across the first cell is…2006 · Q132 · MCQ
  86. Kirchoff's first and second laws of electrical circuits are consequences of2006 · Q133 · MCQ
  87. Power dissipated across the 8 Ω resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 Ω resistor is Includes diagram2006 · Q134 · MCQ
  88. A 5-ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is2005 · Q130 · MCQ
  89. For the network shown in the figure the value of the current i is Includes diagram2005 · Q141 · MCQ
  90. Two batteries, one of emf 18 volts and internal resistance 2 Ω and the other of emf 12 volts and internal resistance 1 Ω, are connected as shown. The voltmeter V will record a reading of Includes diagram2005 · Q173 · MCQ
  91. When a wire of uniform cross-section a length l and resistance R is bent into a complete circle. resistance between any two of diametrically opposite points will be2005 · Q174 · MCQ
  92. Five equal resistances each of resistances R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be Includes diagram2004 · Q119 · MCQ
  93. when three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be2004 · Q120 · MCQ
  94. A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 cm will be2004 · Q121 · MCQ
  95. In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be2004 · Q122 · MCQ
  96. Resistance n, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the combination would have a resistance in ohms, equal to2004 · Q123 · MCQ
  97. The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then2004 · Q124 · MCQ
  98. Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be2003 · Q130 · MCQ
  99. Fuse wire is a wire of2003 · Q131 · MCQ
  100. In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is2003 · Q132 · MCQ
  101. An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in…2003 · Q133 · MCQ
  102. Specific resistance of a conductor increases with2002 · Q143 · MCQ
  103. For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a resistance of R = 5 Ω. Determine internal resistance of cell (r)2002 · Q173 · MCQ
  104. If specific resistance of a potentiometer wire is 10-7Ω m and current flow through it is 0.1 amp., cross-sectional area of wire is 10−6 m2 then potential gradient will be2001 · Q139 · MCQ
  105. The resistance of each arm of the Wheatstone's bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be2001 · Q170 · MCQ
  106. Copper and silicon is cooled from 300 K to 60 K , the specific resistance2001 · Q171 · MCQ
  107. The net resistance of the circuit between A and B is Includes diagram2000 · Q127 · MCQ
  108. A car battery of emf 12 V and internal resistance 5×10−2 Ω., receives a current of 60 amp, from external source, then terminal potential difference of battery is2000 · Q128 · MCQ
  109. Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances2000 · Q129 · MCQ
  110. The potentiometer is best for measuring voltage, as2000 · Q130 · MCQ