Current Electricity PYQs Set 13 (PDF)

Set 13 of 21 · Questions 361-390 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 13 (Q361-390)
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361. $A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of 4 \times 1 0^{-4} A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, It should be connected to a resistance of:$ (1) $250 ohm$ (2) $200 ohm$ (3) $6200 ohm$ (4) $6250 ohm$ 362. $A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is: (E is mid-point of arm CD)$ (1) $R$ (2) $\frac{7}{64} R$ (3) $\frac{3}{4} R$ (4) $\frac{1}{16} R$ 363. $In the figure shown, the current in the 10 V battery is close to$ (1) $0.36 A from negative to positive terminal$ (2) $0.42 A from positive to negative terminal$ (3) $0.71 A from positive to negative terminal$ (4) $0.21 A from positive to negative terminal$ 364. $Sliding contact of a potentiometer is in the middle of the potentiometer wire having resistance R_{p} = 1Ω as shown in the figure. An external resistance of R_{e} = 2Ω is connected via the sliding contact. The electric current in the circuit is:$ (1) $0.9 A$ (2) $1.35 A$ (3) $0.3 A$ (4) $1.0 A$ 365. $A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be$ (1) $2 A$ (2) $1 A$ (3) $0.5 A$ (4) $0.25 A$ 366. $In the circuits shown below, the readings of the voltmeters and the ammeters will be$ (1) $V_{2} > V_{1} and i_{1} = i_{2}$ (2) $V_{1} = V_{2} and i_{1} > i_{2}$ (3) $V_{1} = V_{2} and i_{1} = i_{2}$ (4) $V_{2} > V_{1} and i_{1} > i_{2}$ 367. $A current of 15 mA flows in the circuit as shown in figure. The value of potential difference between the points A and B will be$ (1) $50 V$ (2) $75 V$ (3) $150 V$ (4) $275 V$ 368. $The equivalent resistance between A and B is 6Ω . The value of R_{1} is$ (1) $20Ω$ (2) $10Ω$ (3) $5Ω$ (4) $25Ω$ 369. $Power dissipated across the 8 Ω resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 Ω resistor is$ (1) $3.0$ (2) $2.0$ (3) $1.0$ (4) $0.5$ 370. $The resultant resistance between A and B in the given figure is$ (1) $1Ω$ (2) $2Ω$ (3) $3Ω$ (4) $6Ω$ 371. $A cell having an emf ϵ and internal resistance r is connected across a variable external resistance R . As the resistance R is increased, the plot of potential difference V across R is given by$ (1) (2) (3) (4) 372. $The potential difference (V_{A} - V_{B}) between the points A and B in the given figure is [NEET 2016]$ (1) $-3 V$ (2) $+3 V$ (3) $+6 V$ (4) $+9 V$ 373. $The equivalent resistance between A and B is$ (1) $\frac{2}{3} Ω$ (2) $\frac{1}{2} Ω$ (3) $\frac{3}{2} Ω$ (4) $\frac{1}{3} Ω$ 374. $Variation of resistance of the conductor with temperature is as shown. The temperature co-efficient (α) of the conductor is$ (1) $\frac{R _{0}}{m}$ (2) $m R_{o}$ (3) $m^{2} R_{o}$ (4) $\frac{m}{R _{o}}$ 375. $Six resistors of 3 Ω each are connected along the sides of a hexagon and three resistors of 6 Ω each are connected along AC, AD and AE as shown in the figure. The equivalent resistance between A and B is equal to$ (1) $2 Ω$ (2) $6 Ω$ (3) $3 Ω$ (4) $9 Ω$ 376. $For the circuit shown in the figure, the current l will be [NEET 2020]$ (1) $0.75 A$ (2) $1 A$ (3) $1.5 A$ (4) $0.5 A$ 377. $If the charge on the capacitor is 1 mC in the given circuit, then \frac{R _{1} R _{2}}{R _{3}} = \dots \dots \dots \dots . Ω .$ (1) $6$ (2) $0.4$ (3) $0.6$ (4) $10$ 378. $A resistance is shown in the figure. Its value and tolerance are given respectively by:$ (1) $270 Ω, 5%$ (2) $27 kΩ, 20%$ (3) $270 Ω, 10%$ (4) $27 kΩ, 10%$ 379. $A ring is made of a wire having a resistance R_{0} = 12 Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these points is equal to \frac{8}{3} Ω .$ (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) $\frac{l _{1}}{l _{2}} = \frac{1}{2}$ 380. $In the circuit shown, a four-wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01Ω/ cm . If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be:$ (1) $0.50 V$ (2) $0.75 V$ (3) $0.25 V$ (4) $0.20$ 381. $The current I drawn from the 5 volt source will be$ (1) $0.67 A$ (2) $0.17 A$ (3) $0.33 A$ (4) $0.5 A$ 382. $A 1m long wire is broken into two unequal parts X and Y The X part of the wire is starched into another wire W. Length of W is twice the length of X and the resistance of W is twice that of Y. Find the ratio of length of X and Y.$ (1) $1 : 4$ (2) $1 : 2$ (3) $4 : l$ (4) $2 : l$ 383. $Two resistors 400Ω and 800Ω are connected in series across a 6 V battery. The potential difference measured by a voltmeter of 10 k Ω across 400Ω resistor is close to$ (1) $2.05 V$ (2) $1.8 V$ (3) $2 V$ (4) $1.95 V$ 384. $A metal wire of resistance 3Ω is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on the circle make an angle 60° at the centre, the equivalent resistance between these two points will be:$ (1) $\frac{12}{5} Ω$ (2) $\frac{5}{2} Ω$ (3) $\frac{5}{3} Ω$ (4) $\frac{7}{2} Ω$ 385. $The deflection in moving coil galvanometer falls from 25 divisions to 5 division when a shunt of 24Ω is applied. The resistance of galvanometer coil will be :$ (1) $12Ω$ (2) $96Ω$ (3) $48Ω$ (4) $100Ω$ 386. $With a resistance of X in the left gap and a resistance of 9Ω in the right gap of a meter bridge, the balance point is obtained at 40 cm from the left end. In what way and to which resistance 3Ω resistance to be connected to obtain the balance at 50 cm from the left end?$ (1) $in series with 9Ω$ (2) $parallel to XΩ$ (3) $in series with XΩ$ (4) $parallel to 9Ω$ 387. $Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 Ω . A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is$ (1) $2.5 Ω$ (2) $4 Ω$ (3) $5 Ω$ (4) $10 Ω$ 388. $A resistor of resistance R is connected between the terminals of a cell of emf E and internal resistance r. If I is the current through the circuit. The terminal potential difference of the cell is given by$ (1) $IR$ (2) $E - Ir$ (3) $\frac{ER}{R + r}$ (4) $\frac{E - R}{r}$ 389. $If n represents the actual number of deflections in a converted galvanometer of resistance G and shunt resistance S. Then the total current I when its figure of merit is K will be:$ (1) $\frac{KS}{( S + G )}$ (2) $\frac{( G + S )}{nKS}$ (3) $\frac{nKS}{( G + S )}$ (4) $\frac{nK ( G + S )}{S}$ 390. $Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is:$ (1) $\frac{3 R}{2}$ (2) $\frac{R}{2}$ (3) $R$ (4) $2R$