Current Electricity PYQs Set 17 (PDF)

Set 17 of 21 · Questions 481-510 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 17 (Q481-510)
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481. $A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. When a resistance R is connected in series, it works perfectly, and the bulb consumes 500 W The value of R is$ (1) $230Ω$ (2) $46Ω$ (3) $26Ω$ (4) $13Ω$ 482. $A wire of resistance 12 ohms per meter is bent to form a complete circle of radius 10 cm . The resistance between its two diametrically opposite points, A and B as shown in the figure is$ (1) $3 Ω$ (2) $6 πΩ$ (3) $6 Ω$ (4) $0.6 πΩ$ 483. $The terminal voltage of the battery, whose emf is 10 V and internal resistance 1Ω, when connected through an external resistance of 4Ω as shown in the figure is [NEET 2024]$ (1) $4 V$ (2) $6 V$ (3) $8 V$ (4) $10 V$ 484. $In the experimental set up of meter bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10Ω resistor is connected in series with R_{1}, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R_{1} + 10) Ω such that the null point shifts back to its initial position is:$ (1) $60$ (2) $30$ (3) $20$ (4) $40$ 485. $The length of a potentiometer wires is l. A cell of emf E is balanced at a length (\frac{l}{3}) from positive end of the wire. If the length of the wire is increased by (\frac{l}{2}), the distance at which the same cell gives the balancing point is (Cell in the primary is ideal and no series resistance is present in the primary circuit.)$ (1) $\frac{2 l}{3}$ (2) $\frac{l}{2}$ (3) $\frac{l}{6}$ (4) $\frac{4 l}{3}$ 486. $In the circuit shown in the figure, if potential at point A is taken to be zero the potential at point B is:$ (1) $-1V$ (2) $+ 2V$ (3) $- 2V$ (4) $+ 1V$ 487. $In the given figure: V_{1} = V, V_{2} = αV, R_{1} = βR, R_{2} = γR, where α, β, and γ are positive real numbers. The value of current I is$ (1) $\frac{( α - 1 ) γ}{4 β ( β + γ )} \frac{V}{R}$ (2) $\frac{( α - 1 )}{4 β} \frac{V}{R}$ (3) $\frac{( α - 1 ) β}{2 γ ( β + γ )} \frac{V}{R}$ (4) $\frac{( α - 1 ) ( β + γ )}{2 βγ} \frac{V}{R}$ 488. $During an experiment with a meter bridge, the galvanometer shows a null point when the joceky is pressed at 40.0 cm using a standard resistance of 90 Ω, as shown in the figure. The least count of the scale used in the meter bridge is 1 mm. The unknown resistance is$ (1) $60 \pm 0.15Ω$ (2) $135 \pm 0.56Ω$ (3) $60 \pm 0.25Ω$ (4) $135 \pm 0.23Ω$ 489. $In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be:$ (1) $\frac{1}{499} G$ (2) $\frac{499}{500} G$ (3) $\frac{1}{500} G$ (4) $\frac{500}{499} G$ 490. $A direct current of 4 A and an alternating current of peak value 4A flow through resistance of 3 Ω and 2 Ω respectively. The ratio of heat produced in the two resistances in same interval of time will be:$ (1) $3 : 2$ (2) $3 : 1$ (3) $3 : 4$ (4) $4: 3$ 491. $In this circuit, when certain current flows, the heat produced in 5Ω is 4.05 J in a time t . The heat produced in 2Ω coil in the same time interval is$ (1) $5.76$ (2) $1.44$ (3) $2.88$ (4) $2.02$ 492. $A potentiometer wire AB having length L and resistance 12 r is joined to a cell D of emf ϵ and internal resistance r. A cell C having emf ϵ /2 and internal resistance 3 r is connected. The length AJ at which the galvanometer as shown in fig. shows no deflection is:$ (1) $\frac{11}{12} L$ (2) $\frac{11}{24} L$ (3) $\frac{13}{24} L$ (4) $\frac{5}{12} L$ 493. $Two cells of same emf but different internal resistances r_{1} and r_{2} are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is$ (1) $r_{2} - r_{1}$ (2) $r_{1} - r_{2}$ (3) $r_{1}$ (4) $r_{2}$ 494. $The current I in the given circuit will be$ (1) $10 A$ (2) $20 A$ (3) $4 A$ (4) $40 A$ 495. $In a wheatstone bridge as shown in the figure. What will be the condition for no deflection in galvanometer?$ (1) $\frac{Q}{P} = \frac{R ( S _{1} + S _{2} )}{S _{1} S _{2}}$ (2) $\frac{Q}{P} = \frac{R}{S _{1} S _{2}}$ (3) $\frac{P}{Q} = \frac{R ( S _{1} + S _{2} )}{S _{1} S _{2}}$ (4) $\frac{P}{Q} = \frac{R}{S _{1} + S _{2}}$ 496. $A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminals of the battery are short-circuited. A graph of current (I) in the circuit verses the number of cells will be as shown in figure.$ (1) (2) (3) (4) 497. $In the following network, the current flowing through 15Ω resistance is$ (1) $0.8 A$ (2) $1.0 A$ (3) $1.2 A$ (4) $1.4 A$ 498. $Figure shows a part of an electric circuit. The potentials at points a, b and c are 30 V, 12 V and 2 V respectively. The current through the 20 Ω resistor will be,$ (1) $1.0A$ (2) $0.4 A$ (3) $0.6 A$ (4) $0.2 A$ 499. $In the circuit shown, the value of I in ampere is$ (1) $1$ (2) $0.60$ (3) $0.4$ (4) $1.5$ 500. $The equivalent resistance of the circuit shown below between points a and b is:$ (1) $16 Ω$ (2) $3.2 Ω$ (3) $24 Ω$ (4) $20 Ω$ 501. $A resistance is shown in the figure. Its value and tolerance are given respectively by:$ (1) $270Ω, 10 %$ (2) $27 k Ω, 10 %$ (3) $27 kΩ, 20 %$ (4) $270Ω, 5 %$ 502. $Two identical batteries each of e.m.f 2 V and internal resistance 1Ω are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is$ (1) $3.2 W$ (2) $2.0 W$ (3) $1.28 W$ (4) $\frac{8}{9} W$ 503. $In the figure shown, what is the current (in Ampere) drawn from the battery? You are given: R_{1} = 15Ω, R_{2} = 10Ω, R_{3} = 20Ω, R_{4} = 5Ω, R_{5} = 25Ω, R_{6} = 30Ω, E = 15 V$ (1) $13/24$ (2) $7/18$ (3) $9/32$ (4) $20/3$ 504. $In the circuit, the cells are having negligible resistances. If the galvanometer shows null defection then the value of ' V ' is$ (1) $12 V$ (2) $6 V$ (3) $4 V$ (4) $2 V$ 505. $The current I_{1} (in A) flowing through 1 Ω resistor in the following circuit is$ (1) $0.2$ (2) $0.4$ (3) $0.5$ (4) $0.25$ 506. $From the graph between current (I) and voltage (V) is shown. Identify the portion corresponding to negative resistance$ (1) $CD$ (2) $DE$ (3) $AB$ (4) $BC$ 507. $Potential difference between A and B in the following circuit$ (1) $4 V$ (2) $5.6 V$ (3) $2.8 V$ (4) $6 V$ 508. $In the circuit, given in the figure currents in different branches and value of one resistor are shown. Then potential at point B with respect to the point A is$ (1) $+ 1 V$ (2) $- 2 V$ (3) $+ 2 V$ (4) $- 1 V$ 509. $In the given circuit diagram, a wire is joining points B and D. The current in this wire is:$ (1) $1.6 A$ (2) $2 A$ (3) $2.4 A$ (4) $3 A$ 510. $In a wheatstone bridge (see fig.), Resistances P and Q are approximately equal. When R = 400 Ω, the bridge is balanced. On interchanging P and Q, the value of R, for balance, is 405 Ω. The value of X is close to:$ (1) $404.5 ohm$ (2) $402.5 ohm$ (3) $403.5 ohm$ (4) $401.5 ohm$