Current Electricity PYQs Set 20 (PDF)

Set 20 of 21 · Questions 571-600 of 612

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Mere Teacher · Previous Year Questions NEET Physics · Current Electricity · Set 20 (Q571-600)
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571. $A 5‐ampere fuse wire can withstand a maximum power of 1 watt in the circuit. The resistance of the fuse wire is$ (1) $0.04 ohm$ (2) $0.2 ohm$ (3) $5 ohm$ (4) $0.4 ohm.$ 572. $The current in the given circuit is$ (1) $4.9 A$ (2) $6.8 A$ (3) $8.3 A$ (4) $2.0 A$ 573. $This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements Statement -I: For higher range, the resistance of ammeter (R_{A} \approx shunt resistance) should be more. Statement -II: To increase the range of ammeter, additional shunt needs to be used across it.$ (1) $Statement -II is true, Statement -II is true, Statement -II is the correct explanation of Statement -I.$ (2) $Statement -I is true, Statement - II is true, Statement -II is not the correct explanation of Statement -II.$ (3) $Statement -I is true, Statement - II is false$ (4) $Statement -I is false, Statement - II is true.$ 574. $A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4 mA current. A voltmeter is made using this galvanometer and a 5 kΩ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:$ (1) $40 V$ (2) $15 V$ (3) $20 V$ (4) $10 V$ 575. $This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement -I: Higher the range, greater is the resistance of ammeter. Statement -II: To increase the range of ammeter, additional shunt needs to be used across it.$ (1) $Statement -I is true, Statement -II is true, Statement -II is the correct explanation of Statement -I.$ (2) $Statement -I is true, Statement - II is true, Statement -II is not the correct explanation of Statement -I$ (3) $Statement -I is true, Statement - II is false.$ (4) $Statement -I is false, Statement - II is true.$ 576. $An infinite line charge of uniform electric charge density λ lies along the axis of an electrically conducting infinite cylindrical shell of radius R. At time t = 0, the space inside the cylinder is filled with a material of permittivity ε and electrical conductivity σ. The electrical conduction in the material follows Ohm's law. Which one of the following graphs best describes the subsequent variation of the magnitude of current density j (t) at any point in the material?$ (1) (2) (3) (4) 577. $What will be the most suitable combination of three resistors A = 2 Ω, B = 4 Ω, C = 6 Ω so that (\frac{22}{3}) Ω is equivalent resistance of combination?$ (1) $Parallel combination of A and C connected in series with B.$ (2) $Parallel combination of A and B connected in series with C.$ (3) $Series combination of A and C connected in parallel with B.$ (4) $Series combination of B and C connected in parallel with A.$ 578. $A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor. The current in the circuit is 0.5 A . The terminal voltage of the battery when the circuit is closed is$ (1) $10 V$ (2) $0 V$ (3) $1.5 V$ (4) $8.5 V$ 579. $A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is kvolt / cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths l_{1} cm and l_{2} cm respectively The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to$ (1) $k (l_{2} - l_{1}) and k l_{2}$ (2) $k l_{1} and k (l_{2} - l_{1})$ (3) $k (l_{2} - l_{1}) and k l_{1}$ (4) $k l_{1} and k l_{2}$ 580. $The reading of the ammeter (A) in steady state in the following circuit (assuming negligible internal resistance of the ammeter) is____A.$ (1) $1$ (2) $1/2$ (3) $0$ (4) $2$ 581. $The potential difference (V_{A} - V_{B}) between the points A and B in the given figure is$ (1) $- 3 V$ (2) $+ 3 V$ (3) $+ 6$ (4) $+ 9 V$ 582. $In the given circuit, the potential at the point B with respect to the point A is$ (1) $6 V$ (2) $- 6 V$ (3) $2 V$ (4) $- 2 V$ 583. $The effective resistance between A and B, if resistance of each resistor is R, will be$ (1) $\frac{8 R}{3}$ (2) $\frac{5 R}{3}$ (3) $\frac{4 R}{3}$ (4) $\frac{2}{3} R$ 584. $An electric bulb of 500 watt at 100 volt is used in a circuit having a 200V supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is 500W.$ (1) $20Ω$ (2) $30Ω$ (3) $5Ω$ (4) $10Ω$ 585. $Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across A and B, their readings are V_{1}, V_{2} and V_{3} . Choose the correct option.$ (1) $V_{1} = V_{2}$ (2) $V_{1} \neq = V_{3} - V_{2}$ (3) $V_{1} + V_{2} > V_{3}$ (4) $V_{1} + V_{2} = V_{3}$ 586. $A carbon resistance has a following colour code. What is the value of the resistance?$ (1) $5.3 MΩ + 5%$ (2) $530 kΩ + 5%$ (3) $64 kΩ + 10%$ (4) $6.4 MΩ + 5%$ 587. $The current ’ i_{1} ’ in the given circuit is$ (1) $0.2 A$ (2) $0.3 A$ (3) $0.5 A$ (4) $0.25 A$ 588. $The equivalent resistance between A and B is:$ (1) $18Ω$ (2) $19Ω$ (3) $25Ω$ (4) $27Ω$ 589. $Find the equivalent resistance between two ends of the following circuit$ (1) $\frac{r}{9}$ (2) $\frac{r}{3}$ (3) $r$ (4) $\frac{r}{6}$ 590. $To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained : If V_{o} is almost zero, identify the correct statement$ (1) $The emf of the battery is 1.5 V and its internal resistance is 1.5Ω$ (2) $The value of the resistance R is 1.5Ω$ (3) $The potential difference across the battery is 1.5 V when it sends a current of 1000 mA$ (4) $The emf of the battery is 1.5 V and the value of R is 1.5Ω$ 591. $The equivalent resistance of the given circuit between the terminals A and B is:$ (1) $0Ω$ (2) $3Ω$ (3) $\frac{9}{2} Ω$ (4) $1Ω$ 592. $In the given circuit, the terminal potential difference of the cell is:$ (1) $2 V$ (2) $3 V$ (3) $4 V$ (4) $1.5 V$ 593. $From the combination of resistors with resistances values R_{1} = R_{2} = R_{3} = 5Ω and R_{4} = 10Ω, which of the following combination is the best circuit to get an equivalent resistance of 6Ω ?$ (1) (2) (3) (4) 594. $The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is:$ (1) $(5700 \pm 285) Ω$ (2) $(7500 \pm 750) Ω$ (3) $(5700 \pm 375) Ω$ (4) $(7500 \pm 375) Ω$ 595. $In the below circuit the current in each resistance is:$ (1) $0 A$ (2) $1 A$ (3) $0.25 A$ (4) $0.5 A$ 596. $Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: For measuring the potential difference across a resistance of 600 Ω, the voltmeter with resistance 1000 Ω will be preferred over voltmeter with resistance 4000 Ω . Reason R: Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance. In the light of the above statements, choose the most appropriate answer from the options given below.$ (1) $A is not correct but R is correct$ (2) $Both A and R are correct and R is the correct explanation of A$ (3) $Both A and R are correct but R is not the correct explanation of A$ (4) $A is correct but R is not correct$ 597. $Fuse wire is a wire of$ (1) $high resistance and high melting point$ (2) $high resistance and low melting point$ (3) $low resistance and low melting point$ (4) $low resistance and high melting point$ 598. $Which of the following acts as a circuit protection device?$ (1) $fuse$ (2) $conductor$ (3) $inductor$ (4) $switch$ 599. $The resistance of each arm of the Wheatstone’s bridge is 10 ohm. A resistance of 10 ohm is connected in series with a galvanometer then the equivalent resistance across the battery will be$ (1) $10 ohm$ (2) $15 ohm$ (3) $20 ohm$ (4) $40 ohm.$ 600. $Identify the set in which all the three materials are good conductors of electricity$ (1) $Cu,Hg and NaCl$ (2) $Cu, Ge and Hg$ (3) $Cu, Ag and Au$ (4) $Cu, Si and diamond.$