Current Electricity PYQs Set 11 (PDF)

Set 11 of 21 · Questions 301-330 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 11 (Q301-330)
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301. $A battery of 6 V is connected to the circuit as shown below. The current I drawn from the battery is$ (1) $1 A$ (2) $2 A$ (3) $\frac{6}{11} A$ (4) $\frac{4}{3} A$ 302. $A potentiometer wire has length 4 m and resistance 8 Ω . The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V, so as to get a potential gradient 1 mV per cm on the wire is$ (1) $44 Ω$ (2) $48 Ω$ (3) $32 Ω$ (4) $40 Ω$ 303. $In steady state, a capacitor of capacitance 2 μF is charged to 4 μC, as shown in figure. If the internal resistance of the cell is 0.5Ω, then the emf of the cell is$ (1) $4 V$ (2) $5 V$ (3) $2.5 V$ (4) $2 V$ 304. $See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?$ (1) $ε_{1} - (i_{1} + i_{2})R - i_{1} r_{1} = 0$ (2) $ε_{2} - i_{2} r_{2} - ε_{1} - i_{1} r_{1} = 0$ (3) $- ε_{2} - (i_{1} + i_{2})R + i_{2} r_{2} = 0$ (4) $ε_{1} - (i_{1} + i_{2})R + i_{1} r_{1} = 0$ 305. $On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is 1KΩ. How much was the resistance on the left slot before interchanging the resistances?$ (1) $550$ (2) $910$ (3) $990$ (4) $505$ 306. $Two bars of equal resistivity ρ and radii 'r' and '2r' are kept in contact as shown. An electric current I is passed through the bars. Which one of the following is correct$ (1) $Heat produced in bar (a) is 2 times the heat produced in bar (b)$ (2) $Electric field in both halves is equal$ (3) $Current density across AB is double that across BC.$ (4) $Potential difference across BC is 4 times that across AB.$ 307. $In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm. The ratio of the emf of two cells, \frac{ϵ _{1}}{ϵ} is$ (1) $\frac{5}{3}$ (2) $\frac{8}{5}$ (3) $\frac{4}{3}$ (4) $\frac{3}{2}$ 308. $An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and resistance 5Ω . The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire is:$ (1) $490Ω$ (2) $480Ω$ (3) $395Ω$ (4) $495Ω$ 309. $In the circuit shown the cells A and B have negligible resistances. For V_{A} = 12V, R_{1} = 500Ω and R = 100Ω the galvanometer (G) shows no deflection. The value of V_{B} is:$ (1) $4V$ (2) $2V$ (3) $12V$ (4) $6V$ 310. $The resistance in following circuit are R_{1} = R_{2} = R_{3} = 6.0Ω . The emf of the battery is 12 V . When switch S is closed, the potential across resistance R_{1} is changed by an amount.$ (1) $- 2 V$ (2) $+ 2 V$ (3) $- 4 V$ (4) $+ 4 V$ 311. $The net resistance of the circuit between A and B is$ (1) $\frac{8}{3} Ω$ (2) $\frac{14}{3} Ω$ (3) $\frac{16}{3} Ω$ (4) $\frac{22}{3} Ω$ 312. $Two metal wires of identical dimension are connected in series. If σ_{1} and σ_{2} are the conductivities of the metal wires respectively, the effective conductivity of the combination is:$ (1) $\frac{σ _{1} + σ _{2}}{2 σ _{1} σ _{2}}$ (2) $\frac{σ _{1} + σ _{2}}{σ _{1} σ _{2}}$ (3) $\frac{σ _{1} σ _{2}}{σ _{1} + σ _{2}}$ (4) $\frac{2 σ _{1} σ _{2}}{σ _{1} + σ _{2}}$ 313. $A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into a square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is Options$ (1) $8/9$ (2) $27/32$ (3) $32/27$ (4) $9/8$ 314. $In a meter bridge, the wire of length 1 m has a non-uniform cross-section such that, the variation \frac{dR}{dl} of its resistance R with length I is \frac{dR}{dl} \propto \frac{1}{l} . Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P What is the length AP ?$ (1) $0.2 m$ (2) $0.3 m$ (3) $0.25 m$ (4) $0.35 m$ 315. $A wire of uniform resistance λΩ / m is bent into a circle of radius r and another piece of wire with length 2 r is connected between points A and B (AOB) as shown in figure. The equivalent resistance between points A and B is____Ω .$ (1) $\frac{3 πλr}{8}$ (2) $\frac{6 πλr}{3 π + 16}$ (3) $2 πλr$ (4) $(π + 1) 2 rλ$ 316. $Determine the charge on the capacitor in the following circuit:$ (1) $60 μC$ (2) $2 μC$ (3) $10 μC$ (4) $200 μC$ 317. $The meter bridge shown is in balance position with \frac{P}{Q} = \frac{l _{1}}{l _{2}} . If we now interchange the positions of galvanometer and cell, will the bridge work?. If yes, what will be balanced condition?$ (1) $yes, \frac{P}{Q} = \frac{l _{2} - l _{1}}{l _{2} + l _{1}}$ (2) $no, no null point$ (3) $yes, \frac{P}{Q} = \frac{l _{2}}{l _{1}}$ (4) $yes, \frac{P}{Q} = \frac{l _{1}}{l _{2}}$ 318. $In the circuit shown in the figure, if the potential at point A is taken to be zero, the potential at point B is$ (1) $+ 1 V$ (2) $- 1 V$ (3) $+ 2 V$ (4) $- 2 V$ 319. $In the given circuit the cells have zero internal resistance. The currents (in Amperes) passing through resistance R_{1} and R_{2} respectively, are:$ (1) $1, 2$ (2) $2, 2$ (3) $0.5, 0$ (4) $0, 1$ 320. $A wire of length 25 m and cross-sectional area 5 mm^{2} having resistivity of 2 \times 10^{- 6} Ω m is bent into a complete circle. The resistance between diametrically opposite points will be$ (1) $100Ω$ (2) $2.5Ω$ (3) $12.5Ω$ (4) $50Ω$ 321. $The I - V graphs for two different electrical appliances P and Q are shown in the diagram. If R_{p} and R_{Q} be the resistances of the devices, then$ (1) $R_{p} = R_{0}$ (2) $R_{p} > R_{Q}$ (3) $R_{p} < R_{Q}$ (4) $R_{p} = \frac{R _{Q}}{2}$ 322. $A battery of emf E has an internal resistance ' r '. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. If R alone is gradually reduced to zero, which of the following best describes I and V?$ (1) $I approaches zero, V approaches E$ (2) $I approaches E / r, V approaches zero$ (3) $I approaches E / r, V approaches E$ (4) $I approaches infinity, V approaches E$ 323. $The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If P is the point where the galvanometer shows zero reading then the length AP is____cm.$ (1) $25$ (2) $30$ (3) $20$ (4) $15$ 324. $Statement-I: In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. Statement-II: Resistance of a metal increases with increase in temperature.$ (1) $Statement -I is True, Statement -II is True; Statement -II is a correct explanation for Statement -I$ (2) $Statement -I is True, Statement -II is True; Statement -II is NOT a correct explanation for Statement -I$ (3) $Statement -I is True, Statement -II is False$ (4) $Statement -I is False, Statement-II is True.$ 325. $The Wheatstone bridge shown in Fig. here, gets balanced when the carbon resistor used as R_{1} has the colour code (Orange, Red, Brown). The resistors R_{2} and R_{4} are 80Ω and 40Ω, respectively. Assuming that the colour code for the carbon resistorsgives their accurate values, the colour code for the carbon resistor, used as R_{3}, would be:$ (1) $Brown, Blue, Brown$ (2) $Brown, Blue, Black$ (3) $Red, Green, Brown$ (4) $Grey, Black, Brown$ 326. $Two cells of internal resistances r_{1} and r_{2} and of same emf are connected in series across a resistor of resistance R . If the terminal potential difference across the cell of internal resistance r_{1} is zero, then the value of R is$ (1) $R = 2 (r_{1} + r_{2})$ (2) $R = r_{2} - r_{1}$ (3) $R = r_{1} - r_{2}$ (4) $R = 2 (r_{1} - r_{2})$ 327. $The resistive network shown below is connected to a D . C . source of 16 V . The power consumed by the network is 4 Watt. The value of R is$ (1) $6Ω$ (2) $8Ω$ (3) $1Ω$ (4) $16Ω$ 328. $When a metal conductor connected to left gap of a meter bridge is heated, the balancing point$ (1) $remains unchanged$ (2) $shifts towards right$ (3) $shifts to the center$ (4) $shifts towards left$ 329. $Consider the following statements regarding the network shown in the figure. (I) The equivalent resistance of the network between points A and B is independent of value of G. (II) The equivalent resistance of the network between points A and B is \frac{4}{3} R . (III) The current through G is zero. Which of the above statements is/are true?$ (1) $(I) alone$ (2) $(II) alone$ (3) $(II) and (III)$ (4) $(I), (II) and (III)$ 330. $The galvanometer deflection, when key K_{1} is closed but K_{2} is open, equals θ_{0} (see figure). On closing K_{2} also and adjusting R_{2} to 5Ω, the deflection in galvanometer becomes \frac{θ _{0}}{5} . The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery]:$ (1) $5Ω$ (2) $22Ω$ (3) $25Ω$ (4) $12Ω$