Current Electricity PYQs Set 18 (PDF)

Set 18 of 21 · Questions 511-540 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 18 (Q511-540)
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511. $In this circuit, the value of I_{2} is$ (1) $0.2 A$ (2) $0.3 A$ (3) $0.4 A$ (4) $0.6 A$ 512. $Two rods are joined end to end, as shown. Both have a cross‐ sectional area of 0.01 c m^{2} . Each is1 meter long. One rod is of copper with a resistivity of 1.7 \times 1 0^{- 6} ohm‐centimeter, the other is of iron with a resistivity of 1 0^{- 5} ohm‐centimeter. How much voltage is required to produce a current of 1 ampere in the rods?$ (1) $0.00145 V$ (2) $0.0145 V$ (3) $1.7 \times 1 0^{- 6} V$ (4) $0.117 V$ 513. $Current through 3Ω resistor is 0.8 ampere, then potential drop through 4Ω resistor is$ (1) $9. 6 V$ (2) $2. 6 V$ (3) $4. 8 V$ (4) $1. 2 V$ 514. $The value of current in the 6Ω resistance is:$ (1) $4A$ (2) $8A$ (3) $10A$ (4) $6A$ 515. $The equivalent resistance between the points A and B will be (each resistance is 15Ω)$ (1) $10Ω$ (2) $40Ω$ (3) $30Ω$ (4) $8Ω$ 516. $The magnitude and direction of the current in the following circuit is [NEET 2023]$ (1) $0.5 A from A to B through E$ (2) $5/9 A from A to B through E$ (3) $1.5 A from B to A through E$ (4) $0.2 A from B to A through E$ 517. $A wire, 10 m long, has a resistance of 40Ω . It is connected in series with a resistance box of resistance R and a 2 V storage cell. If the potential gradient along the wire is 0.1 mV / cm, then the value of R is$ (1) $260Ω$ (2) $760Ω$ (3) $960Ω$ (4) $1060Ω$ 518. $the switch S_{1} is closed at time t = 0 and the switch S_{2} is kept open. At some later time (t_{0}), the switch S_{1} is opened and S_{2} is closed. the behaviour of the current I as a function of time 't' is given by:$ (1) (2) (3) (4) 519. $The resistance per centimeter of a meter bridge wire is r, with XΩ resistance in left gap. Balancing length from left end is at 40 cm with 25Ω resistance in right gap. Now the wire is replaced by another wire of 2r resistance per centimeter. The new balancing length for same settings will be at$ (1) $20 cm$ (2) $10 cm$ (3) $80 cm$ (4) $40 cm$ 520. $A circuit contains an ammeter, a batter of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be:$ (1) $0.25 A$ (2) $2A$ (3) $1 A$ (4) $0.5 A$ 521. $In the given circuit diagram, the currents, I_{1} = - 0.3A, I_{4} = 0.8 A and I_{5} = 0.4 A, are flowing as shown. The currents I_{2}, I_{3} and I_{6} respectively, are:$ (1) $1.1 A, 0.4 A, 0.4 A$ (2) $-0.4 A, 0.4 A, 1.1 A$ (3) $0.4 A, 1.1 A, 0.4 A$ (4) $1.1 A, -0.4 A, 0.4 A$ 522. $If power dissipated in the 9 Ω resistor in the circuit shown is 36 watt, the potential difference across the 2 Ω resistor is$ (1) $4 volt$ (2) $8 volt$ (3) $10 volt$ (4) $2 volt$ 523. $The potential difference between A and B in the following figure is$ (1) $24 V$ (2) $14 V$ (3) $32 V$ (4) $48 V$ 524. $When a potentiometer is connected between the points A and B as shown in the circuit, balance point is obtained at 64 cm . When it is connected between A and C, the balance point is 8 cm . If the potentiometer is connected between B and C the balance point will be$ (1) $8 cm$ (2) $56 cm$ (3) $64 cm$ (4) $72 cm$ 525. $In the circuit diagram, heat produces in R, 2 R and 1.5 R are in the ratio of$ (1) $4 : 2 : 3$ (2) $8 : 4 : 27$ (3) $2 : 4 : 3$ (4) $27 : 8 : 4$ 526. $A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for \frac{1}{3} deflection in the galvanometer. Which of the below is true for measuring value of G?$ (1) $\frac{1}{3} deflection method cannot be used for determining the resistance of th galvanometer.$ (2) $\frac{1}{3} deflection method can be used and in this case the G equals to twice the value of shunt resistance(s).$ (3) $\frac{1}{3} deflection method can be used and in this case, the G equals to three times the value of shunt resistance(s)$ (4) $\frac{1}{3} deflection method can be used and in this case the G value equals to the shunt resistance(s).$ 527. $The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2 Ω . The value of internal resistance of each cell is:$ (1) $2 Ω$ (2) $4 Ω$ (3) $6 Ω$ (4) $8 Ω$ 528. $A galvanometer having coil resistance 10Ω shows a full scale deflection for a current of 3 mA . For it to measure a current of 8 A, the value of the shunt should be:$ (1) $3\times 1 0^{- 3} Ω$ (2) $4.85\times 1 0^{- 3} Ω$ (3) $3.75\times 1 0^{- 3} Ω$ (4) $2.75\times 1 0^{- 3} Ω$ 529. $Two square shaped metal plates of A and B of same thickness (t) and of same material are connected as shown in the figure. The side of B is twice that of A. If the resistance of A and B are R_{A} and R_{B} respectively then \frac{R _{A}}{R _{B}} is$ (1) $\frac{1}{2}$ (2) $2$ (3) $1$ (4) $4$ 530. $The actual value of resistance R, shown in the figure is 30Ω . This is measured in an experiment as shown using the standard formula R = \frac{V}{I}, where V and I are the reading of the voltmeter and ammeter, respectively. If the measured value of R is 5 % less, then the internal resistance of the voltmeter is:$ (1) $600Ω$ (2) $570Ω$ (3) $35Ω$ (4) $350Ω$ 531. $Consider a thin square sheet of side L and thickness t, made of a material of resitivity ρ. The resistance between two opposite faces, shown by the shaded areas in the figure is:$ (1) $directly proportional to L$ (2) $directly proportional to t$ (3) $independent of L$ (4) $independent of t$ 532. $Three voltmeters A, B and C having resistances R, 1.5 R and 3R respectively are used in a circuit as shown. When a P.D. is applied between X and Y, the reading of the voltmeters are V_{1}, V_{2} and V_{3} respectively. Then$ (1) $V_{1} = V_{2} = V_{3}$ (2) $V_{1} < V_{2} = V_{3}$ (3) $V_{1} > V_{2} > V_{3}$ (4) $V_{1} > V_{2} = V_{3}$ 533. $A wire of length 3 m connected in the left gap of a meter-bridge balances 8Ω resistance in the right gap at a point, which divides the bridge wire in the ratio 3 : 2 . The length of the wire corresponding to resistance of 1Ω is$ (1) $1 m$ (2) $0.75 m$ (3) $0.5 m$ (4) $0.25 m$ 534. $Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be [NEET 2019]$ (1) $9 : 4$ (2) $1 : 2$ (3) $2 : 1$ (4) $4 : 9$ 535. $If the resistance of each edge of a cube shaped wire frame as shown in figure below is R, then the resistance between points 1 and 7 is$ (1) $\frac{5 R}{6}$ (2) $\frac{R}{6}$ (3) $5R$ (4) $\frac{6}{5} R$ 536. $A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistances 2Ω each and leaves by the corner R . Then the current I_{1} and I_{2} are$ (1) $2 A, 4 A$ (2) $4 A, 2 A$ (3) $1 A, 2 A$ (4) $2 A, 3 A$ 537. $The range of an ammeter of resistance ' G' can be increased from I to nI by connecting$ (1) $a series resistance of \frac{G}{n - 1} Ω$ (2) $a shunt of \frac{G}{n - 1} Ω$ (3) $a shunt of \frac{G}{n + 1} Ω .$ (4) $a series resistance of \frac{G}{n + 1} Ω .$ 538. $When a wire of uniform cross‐section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be$ (1) $R /4$ (2) $4 R$ (3) $R /8$ (4) $R /2$ 539. $A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when:$ (1) $R = 0.001 r$ (2) $R = 1000 r$ (3) $R = 2 r$ (4) $R = r$ 540. $A circuit contains an ammeter, a battery of 30 V and a resistance 40.8Ω all connected in series. If the ammeter has a coil of resistance 480Ω and a shunt of 20Ω, then reading in the ammeter will be$ (1) $0.5 A$ (2) $0.25 A$ (3) $2 A$ (4) $1 A$