Current Electricity PYQs Set 12 (PDF)

Set 12 of 21 · Questions 331-360 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 12 (Q331-360)
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331. $In the given circuit the cells have zero internal resistance. The currents (in Amperes) passing through resistance R_{1} and R_{2} respectively are:$ (1) $2, 2$ (2) $0, 0$ (3) $1, 2$ (4) $0.5, 0$ 332. $B_{1}, B_{2} and B_{3} are the three identical bulbs connected to a battery of steady e.m.f. with key K closed. What happens to the brightness of the bulbs B_{1} and B_{2} when the key is opened?$ (1) $Brightness of the bulbs B_{1} increases and that of B_{2} decreases.$ (2) $Brightness of the bulbs B_{1} and B_{2} increases.$ (3) $Brightness of the bulb, B_{1} decreases and that of B_{2} increases.$ (4) $Brightness of the bulbs B_{1} and B_{2} decreases$ 333. $In the given arrangement of experiment on meter bridge, if AD corresponding to null deflection of the galvanometer is x, what would be its yalue if the radius of the wire AB is doubled?$ (1) $x$ (2) $\frac{x}{4}$ (3) $4 x$ (4) $2 x$ 334. $Which of the following graph represents the variation of resistivity (ρ) with temperature (T) for copper? [NEET 2020]$ (1) (2) (3) (4) 335. $In the given circuit diagram, a wire is joining points B and D. The current in this wire is:$ (1) $zero$ (2) $2 A$ (3) $0.4 A$ (4) $4A$ 336. $A cell of emf 90 V is connected across series combination of two resistors each of 100 Ω resistance. A voltmeter of resistance 400 Ω is used to measure the potential difference across each resistor. The reading of the voltmeter will be:$ (1) $40 V$ (2) $45 V$ (3) $80 V$ (4) $90 V$ 337. $Three resistances P, Q, R each of 2 Ω and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 Ω is connected in parallel to S the bridge gets balanced. What is the value of S .$ (1) $3 Ω$ (2) $6 Ω$ (3) $1 Ω$ (4) $2 Ω .$ 338. $The given potentiometer has its wire of resistance 10Ω . When the sliding contact is in the middle of the potentiometer wire, the potential drop across 2Ω resistor is:$ (1) $10V$ (2) $5V$ (3) $\frac{40}{9} V$ (4) $\frac{40}{11} V$ 339. $Two cells, having the same e.m.f. are connected in series through an external resistance R . Cells have internal resistances r_{1} and r_{2} (r_{1} > r_{2}) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is$ (1) $r_{1} + r_{2}$ (2) $r_{1} - r_{2}$ (3) $\frac{r _{1} + r _{2}}{2}$ (4) $\frac{r _{1} - r _{2}}{2}$ 340. $Two known resistances of RΩ and 2 RΩ and one unknown resistance XΩ are connected in a circuit as shown in the figure. If the equivalent resistance between points A and B in the circuit is XΩ, then the value of X is____Ω .$ (1) $(3 - 1) R$ (2) $2 (3 - 1) R$ (3) $(3 + 1) R$ (4) $R$ 341. $The value of current i_{1} flowing from A to C in the circuit diagram is$ (1) $5 A$ (2) $2 A$ (3) $4 A$ (4) $1 A$ 342. $In a Wheatstone’s bridge all the four arms have equal resistance R . If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is$ (1) $R /4$ (2) $R /2$ (3) $R$ (4) $2 R$ 343. $The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure: What is the value of current at t = 4 s ?$ (1) $Zero$ (2) $3 μA$ (3) $2 μA$ (4) $1.5 μA$ 344. $The effective resistance between P and Q for the following network is$ (1) $\frac{1}{12} Ω$ (2) $21Ω$ (3) $12Ω$ (4) $\frac{1}{21} Ω$ 345. $Ten identical cells connected in series are needed to heat a wire of length one meter and radius ‘ r ’ by 1 0^{o} C in time ‘ t ’. How many cells will be required to heat the wire of length two meter of the same radius by the same temperature in time ‘t’?$ (1) $20$ (2) $30$ (3) $40$ (4) $10$ 346. $Two batteries of emf 4 V and 8 V with internal resistance 1 Ω and 2 Ω are connected in a circuit with resistance of 9 Ω as shown in figure. The current and potential difference between the points P and Q are$ (1) $\frac{1}{3} A and 3 V$ (2) $\frac{1}{6} A and 4 V$ (3) $\frac{1}{9} A and 9 V$ (4) $\frac{1}{12} A and 12 V$ 347. $A resistance wire connected in the left gap of a meter bridge balances a 10Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2 . If the length of the resistance wire is 1.5 m , then the length of 1Ω of the resistance wire is [NEET 2020]$ (1) $1.0 \times 10^{- 1} m$ (2) $1.5 \times 10^{- 1} m$ (3) $1.5 \times 10^{- 2} m$ (4) $1.0 \times 10^{- 2} m$ 348. $When the switch S, in the circuit shown, is closed, then the value of current i will be:$ (1) $3A$ (2) $5A$ (3) $4A$ (4) $2A$ 349. $A current of 2 A flows through a 2 Ω resistor when connected across a battery. The same battery supplies a current of 0.5 A when connected across a 9 Ω resistor. The internal resistance of the battery is$ (1) $0.5 Ω$ (2) $1/3 Ω$ (3) $1/4 Ω$ (4) $1 Ω$ 350. $A carbon resistance has following colour code. What is the value of the resistance?$ (1) $530 kΩ \pm 5 %$ (2) $5.3 kΩ \pm 5 %$ (3) $6.4 MΩ \pm 5 %$ (4) $64 MΩ \pm 10 %$ 351. $A battery of the emf 18 V and internal resistance of 3Ω and another battery of emf 10 V and internal resistance of 1Ω are connected as shown in figure. Then, the voltmeter reading is$ (1) $10 V$ (2) $12 V$ (3) $16 V$ (4) $8 V$ 352. $The galvanometer deflection when key K_{1} is closed but K_{2} is open, equals θ_{0} (see figure). On closing K_{2} also and adjusting R_{2} to 5Ω, the deflection in galvanometer becomes \frac{θ _{0}}{5} . The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery]:$ (1) $5$ (2) $12$ (3) $25$ (4) $22$ 353. $In the given circuit, the current through 2Ω resistor is$ (1) $0.4 A$ (2) $0.2 A$ (3) $0.1 A$ (4) $0.3 A$ 354. $For a cell terminal potential difference is 2.2 V when circuit is open and reduces to 1. 8 V when cell is connected to a resistance of R = 5Ω . Determine internal resistance of cell (r)$ (1) $\frac{10}{9} Ω$ (2) $\frac{9}{10} Ω$ (3) $\frac{11}{9} Ω$ (4) $\frac{5}{9} Ω$ 355. $In the given circuit the internal resistance of the 18v cell is negligible. If R_{1} = 400 Ω, R_{3} = 100 Ω and R_{4} = 500 Ω and the reading of an ideal voltmeter across R_{4} is 5V, then the value of R_{2} will be:$ (1) $450$ (2) $550$ (3) $230$ (4) $300$ 356. $In an aluminum (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure, The electrical resistivities of Al and Fe are 2.7\times 1 0^{-8} Ω m and 1.0 \times 1 0^{-7} Ω m, respectively. The electrical resistance between the two faces P and Q of the composite bar is$ (1) $\frac{2475}{64} μΩ$ (2) $\frac{1875}{64} μΩ$ (3) $\frac{1875}{49} μΩ$ (4) $\frac{2475}{132} μΩ$ 357. $In the network shown in the figure, each of the resistance is equal to 2Ω . The resistance between the points A and B is$ (1) $3 Ω$ (2) $4 Ω$ (3) $1 Ω$ (4) $2 Ω .$ 358. $For the circuit A and B as shown in the figure, identify the correct option.$ (1) $Circuit A is for accurate measurement of high resistance and B is for low resistance.$ (2) $Circuit A is for accurate measurement of low resistance and B is for high resistance.$ (3) $Both circuits can accurately measured high resistance only.$ (4) $Both circuits can accurately measured low resistance only.$ 359. $A galvanometer having a coil resistance 100 Ω gives a full scale deflection when a current of 1mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V?$ (1) $8.9 kΩ$ (2) $10 kΩ$ (3) $9.9 kΩ$ (4) $7.9 kΩ$ 360. $A 5 V battery with internal resistance 2 Ω and a 2V battery with internal resistance 1 Ω are connected to a 10 Ω resistor as shown in the figure. The current in the 10 Ω resistor is -$ (1) $0.03 A P_{1} to P_{2}$ (2) $0.03 A P_{2} to P_{1}$ (3) $0.27 A P_{1} to P_{2}$ (4) $0.27 A P^{2} to P_{1}$