Current Electricity PYQs Set 17 (PDF)

Set 17 of 25 · Questions 481-510 of 723

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Mere Teacher · Previous Year Questions JEE Main Physics · Current Electricity · Set 17 (Q481-510)
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481. $The equivalent resistance between A and B as shown in figure is:$ (1) $10k Ω$ (2) $5k Ω$ (3) $20k Ω$ (4) $30 k Ω$ 482. $The equivalent resistance between the points A and B in the following circuit is$ (1) $0.5Ω$ (2) $5.5Ω$ (3) $0.05Ω$ (4) $5Ω$ 483. $The current in 1Ω resistor in the following circuit is$ (1) $1 A$ (2) $0.5 A$ (3) $1.1 A$ (4) $0.8 A$ 484. $A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistances P and Q [NEET 2022]$ (1) $should be approximately equal and are small$ (2) $should be very large and unequal$ (3) $do not play any significant role$ (4) $should be approximately equal to, 2X$ 485. $Two sources of equal emfs are connected in series. This combination is connected to an external resistance R. The internal resistances of the two sources are r_{1} and r_{2} (r_{1} > r_{2}). If the potential difference across the source of internal resistance r_{1} is zero then the value of R will be$ (1) $r_{1} - r_{2}$ (2) $\frac{r _{1} r _{2}}{r _{1} + r _{2}}$ (3) $\frac{r _{1} + r _{2}}{2}$ (4) $r_{2} - r_{1}$ 486. $Find the current in the three resistors as shown in the following figure?$ (1) $i_{1} = 0, i_{2} = \frac{4 V}{R}, i_{3} = \frac{2 V}{R}$ (2) $i_{1} = 0, i_{2} = 0, i_{3} = 0$ (3) $i_{1} = 0, i_{2} = \frac{2 V}{R}, i_{3} = \frac{4 V}{R}$ (4) $i_{1} = 0, i_{2} = \frac{2 V}{R}, i_{3} = \frac{2 V}{R}$ 487. $An ideal battery of 4V and resistance R are connected in series in the primary circuit of a potentiometer of length 1m and resistance 5Ω. The value of R, to give a potential difference of 5mV across 10 cm of potentiometer wire, is:$ (1) $490$ (2) $495$ (3) $480$ (4) $395$ 488. $Five current carrying conductors meet at point P . What is the magnitude and direction of the current in conductor PQ ?$ (1) $1 A from Q to P$ (2) $1 A from P to Q$ (3) $3 A from P to Q$ (4) $2 A from Q to P$ 489. $If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by$ (1) $50Ω$ (2) $100Ω$ (3) $400Ω$ (4) $200Ω$ 490. $In balanced meter bridge, the resistance of bridge wire is 0.1Ω/ cm . Unknown resistance X is connected in left gap and 6Ω in right gap, null point divides the wire in the ratio 2 : 3 . Find the current drawn from the battery of 5 V having negligible resistance.$ (1) $1 A$ (2) $1.5 A$ (3) $2 A$ (4) $5 A$ 491. $A potentiometer wire has length 4m and resistance 8Ω. The resistance that must be connected in series with the wire and an accumulator of e.m.f 2V, so as to get a potential gradient 1mV per cm on the wire is:$ (1) $40$ (2) $44$ (3) $48$ (4) $32$ 492. $The reading of an ideal voltmeter in the circuit shown is$ (1) $0.6 V$ (2) $0 V$ (3) $0.5 V$ (4) $0.4 V$ 493. $A ring is made of a wire having a resistance R_{0} = 12Ω . Find the points A and B, as shown in the figure, at which a current carrying conduct or should be connected so that the resistance R of the sub circuit between these points is equal to \frac{8}{3} Ω$ (1) $\frac{l _{1}}{l _{2}} = \frac{5}{8}$ (2) $\frac{l _{1}}{l _{2}} = \frac{1}{3}$ (3) $\frac{l _{1}}{l _{2}} = \frac{3}{8}$ (4) $\frac{l _{1}}{l _{2}} = \frac{1}{2}$ 494. $A carbon film resistor has colour code Green Black Violet Gold. The value of the resistor is$ (1) $500 \pm 5 % MΩ$ (2) $50 MΩ$ (3) $500 \pm 10 % MΩ$ (4) $500 MΩ$ 495. $The equivalent resistance between A and B for the mesh shown in the figure is [NEET 2020]$ (1) $7.2Ω$ (2) $16Ω$ (3) $30Ω$ (4) $4.8Ω$ 496. $The reading in the ideal voltmeter (V) shown in the given circuit diagram is:$ (1) $5 V$ (2) $10 V$ (3) $0 V$ (4) $3 V$ 497. $The resistance in the two arms of the meter bridge are 5Ω and RΩ, respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1. 6 l_{1} . The resistance 'R' is:$ (1) $10$ (2) $15$ (3) $20$ (4) $25$ 498. $Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be:$ (1) $120 W$ (2) $60 W$ (3) $30 W$ (4) $240 W$ 499. $A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances (R_{1} = R_{2} = R_{3} = R_{4}). When R_{3} resistance is heated to some temperature, its resistance value has gone up 10 % . The potential difference (V_{a} - V_{b}) (after R_{3} is heated) is____V.$ (1) $1.05$ (2) $0.95$ (3) $0$ (4) $2$ 500. $For the circuit given below, the Kirchhoff's loop rule for the loop BCDEB is given by the equation [NEET 2020]$ (1) $- I_{2} R_{2} + E_{2} - E_{3} + I_{3} R_{1} = 0$ (2) $I_{2} R_{2} + E_{2} - E_{3} - I_{3} R_{1} = 0$ (3) $I_{2} R_{2} + E_{2} + E_{3} + I_{3} R_{1} = 0$ (4) $- I_{2} R_{2} + E_{2} + E_{3} + I_{3} R_{1} = 0$ 501. $In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B . The resistance per unit length of the potentioneter wire is r = 0.01Ω/ cm . If an ideal voltmeter is connected as shown with jockey J at 50 cm from end Λ, the expected reading of the voltmeter will be$ (1) $0.25 V$ (2) $0.20 V$ (3) $0.50 V$ (4) $0.75 V$ 502. $The reading of an ideal voltmeter in the circuit shown is [NEET 2019]$ (1) $0.6 V$ (2) $0 V$ (3) $0.5 V$ (4) $0.4 V$ 503. $Effective resistance between A and B in the following circuit$ (1) $10Ω$ (2) $20Ω$ (3) $5Ω$ (4) $\frac{20}{3} Ω$ 504. $What will be the equivalent resistance between the two points A and D?$ (1) $30Ω$ (2) $40Ω$ (3) $20Ω$ (4) $10Ω .$ 505. $In the circuit shown, the currents i_{1} and i_{2} are$ (1) $i_{1} = 1.5 A, i_{2} = 0.5 A$ (2) $i_{1} = 0.5 A, i_{2} = 1.5 A$ (3) $i_{1} = 1 A, i_{2} = 3 A$ (4) $i_{1} = 3 A, i_{2} = 1 A$ 506. $A galvanometer with its coil resistance 25Ω requires a current of 1 mA for its full delection. In order to construct an ammeter to read up to a current of 2 A, the approximate value of the shunt resistance should be$ (1) $1.25\times 1 0^{- 3} Ω$ (2) $1.25\times 1 0^{- 2} Ω$ (3) $2.5\times 1 0^{- 3} Ω$ (4) $2.5 \times 10^{2} Ω$ 507. $The variation of terminal potential difference (V) with current flowing through a cell is as shown. The emf and internal resistance of the cell are$ (1) $6 V, 2Ω$ (2) $3 V, 2Ω$ (3) $6 V, 0.5Ω$ (4) $3 V, 0.5Ω$ 508. $A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω . The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm. then the determined value of R will be _______Ω .$ 509. $In the circuit diagram shown in figure given below, the current flowing through resistance 3 Ω is \frac{x}{3} A. The value of x is________.$ 510. $Current measured by the ammeter (a) in the reported circuit when no current flows through 10 Ω resistance, will be_________A.$