Current Electricity PYQs Set 15 (PDF)

Set 15 of 21 · Questions 421-450 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 15 (Q421-450)
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421. $An ideal battery of 4V and resistance R are connected in series in the primary circuit of a potentiometer of length 1m and resistance 5Ω. The value of R, to give a potential difference of 5mV across 10 cm of potentiometer wire, is:$ (1) $490$ (2) $495$ (3) $480$ (4) $395$ 422. $Five current carrying conductors meet at point P . What is the magnitude and direction of the current in conductor PQ ?$ (1) $1 A from Q to P$ (2) $1 A from P to Q$ (3) $3 A from P to Q$ (4) $2 A from Q to P$ 423. $If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by$ (1) $50Ω$ (2) $100Ω$ (3) $400Ω$ (4) $200Ω$ 424. $In balanced meter bridge, the resistance of bridge wire is 0.1Ω/ cm . Unknown resistance X is connected in left gap and 6Ω in right gap, null point divides the wire in the ratio 2 : 3 . Find the current drawn from the battery of 5 V having negligible resistance.$ (1) $1 A$ (2) $1.5 A$ (3) $2 A$ (4) $5 A$ 425. $A potentiometer wire has length 4m and resistance 8Ω. The resistance that must be connected in series with the wire and an accumulator of e.m.f 2V, so as to get a potential gradient 1mV per cm on the wire is:$ (1) $40$ (2) $44$ (3) $48$ (4) $32$ 426. $The reading of an ideal voltmeter in the circuit shown is$ (1) $0.6 V$ (2) $0 V$ (3) $0.5 V$ (4) $0.4 V$ 427. $A ring is made of a wire having a resistance R_{0} = 12Ω . Find the points A and B, as shown in the figure, at which a current carrying conduct or should be connected so that the resistance R of the sub circuit between these points is equal to \frac{8}{3} Ω$ (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) $\frac{l _{1}}{l _{2}} = \frac{1}{2}$ 428. $A carbon film resistor has colour code Green Black Violet Gold. The value of the resistor is$ (1) $500 \pm 5 % MΩ$ (2) $50 MΩ$ (3) $500 \pm 10 % MΩ$ (4) $500 MΩ$ 429. $The equivalent resistance between A and B for the mesh shown in the figure is [NEET 2020]$ (1) $7.2Ω$ (2) $16Ω$ (3) $30Ω$ (4) $4.8Ω$ 430. $The reading in the ideal voltmeter (V) shown in the given circuit diagram is:$ (1) $5 V$ (2) $10 V$ (3) $0 V$ (4) $3 V$ 431. $The resistance in the two arms of the meter bridge are 5Ω and RΩ, respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1. 6 l_{1} . The resistance 'R' is:$ (1) $10$ (2) $15$ (3) $20$ (4) $25$ 432. $Two equal resistances when connected in series to a battery, consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be:$ (1) $120 W$ (2) $60 W$ (3) $30 W$ (4) $240 W$ 433. $A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances (R_{1} = R_{2} = R_{3} = R_{4}). When R_{3} resistance is heated to some temperature, its resistance value has gone up 10 % . The potential difference (V_{a} - V_{b}) (after R_{3} is heated) is____V.$ (1) $1.05$ (2) $0.95$ (3) $0$ (4) $2$ 434. $For the circuit given below, the Kirchhoff's loop rule for the loop BCDEB is given by the equation [NEET 2020]$ (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) $- I_{2} R_{2} + E_{2} + E_{3} + I_{3} R_{1} = 0$ 435. $In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B . The resistance per unit length of the potentioneter wire is r = 0.01Ω/ cm . If an ideal voltmeter is connected as shown with jockey J at 50 cm from end Λ, the expected reading of the voltmeter will be$ (1) $0.25 V$ (2) $0.20 V$ (3) $0.50 V$ (4) $0.75 V$ 436. $The reading of an ideal voltmeter in the circuit shown is [NEET 2019]$ (1) $0.6 V$ (2) $0 V$ (3) $0.5 V$ (4) $0.4 V$ 437. $Effective resistance between A and B in the following circuit$ (1) $10Ω$ (2) $20Ω$ (3) $5Ω$ (4) $\frac{20}{3} Ω$ 438. $What will be the equivalent resistance between the two points A and D?$ (1) $30Ω$ (2) $40Ω$ (3) $20Ω$ (4) $10Ω .$ 439. $In the circuit shown, the currents i_{1} and i_{2} are$ (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) $i_{1} = 3 A, i_{2} = 1 A$ 440. $A galvanometer with its coil resistance 25Ω requires a current of 1 mA for its full delection. In order to construct an ammeter to read up to a current of 2 A, the approximate value of the shunt resistance should be$ (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) $2.5 \times 10^{2} Ω$ 441. $The variation of terminal potential difference (V) with current flowing through a cell is as shown. The emf and internal resistance of the cell are$ (1) $6 V, 2Ω$ (2) $3 V, 2Ω$ (3) $6 V, 0.5Ω$ (4) $3 V, 0.5Ω$ 442. $Equivalent resistance of the given circuit is$ (1) $R$ (2) $R/2$ (3) $R/4$ (4) $R/6$ 443. $A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V, the power dissipated within the internal resistance is$ (1) $0.10 W$ (2) $0.072 W$ (3) $0.50 W$ (4) $0.125 W$ 444. $The power dissipated in the circuit shown in the figure is 30 watts. The value of R is$ (1) $20 Ω$ (2) $15 Ω$ (3) $10 Ω$ (4) $30 Ω$ 445. $The supply voltage to room is 120 V. The resistance of the lead wires is 6 Ω. A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?$ (1) $zero Volt$ (2) $2.9 Volt$ (3) $13.3 Volt$ (4) $10.04 Volt$ 446. $In the circuit shown, the potential difference between A and B is$ (1) $1 V$ (2) $2 V$ (3) $3 V$ (4) $6 V$ 447. $In Wheatstone's network P = 2Ω, Q = 2Ω, R = 2Ω and S = 3Ω . The resistance with which S is to shunted in order that the bridge may be balanced is$ (1) $2Ω$ (2) $6Ω$ (3) $1Ω$ (4) $4Ω$ 448. $The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is$ (1) $0.8 Ω$ (2) $1.0 Ω$ (3) $0.2 Ω$ (4) $0.5 Ω$ 449. $Two resistors of resistance, 100Ω and 200Ω are connected in parallel in an electrical circuit, The ratio of the thermal energy developed in 100Ω to that in 200Ω in a given time is [NEET 2022]$ (1) $2 : 1$ (2) $1 : 4$ (3) $4 : 1$ (4) $1 : 2$ 450. $Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer. The value of the unknown resistor R is$ (1) $220$ (2) $110$ (3) $55$ (4) $13.75$