PYQSide ExamsMy practice

Current Electricity · Question 74

AIPMT 2010 (Prelims)MCQMedium📈 Topic in 0% papers+4−1
1

A potentiometer circuit is set up as shown. The potential gradient, across the potentiometer wire, is k volt/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 length l1 cm and l2 cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal, respectively, to [figure]

  1. k(l2 - l1) and kl2
  2. kl1 and k(l2 - l1)
  3. k(l2 - l1) and kl1
  4. kl1 and kl2

Answer

(2) kl1 and k(l2 - l1)

Solution

At balance no current flows through the galvanometer, so the current through R and X stays I = 1.0 A.

(i) Key between 1 and 2: the galvanometer branch is across R.

IR = kl1 R = kl1 (as I = 1 A)

(ii) Key between 1 and 3: the galvanometer branch is across (R + X).

I(R + X) = kl2 R + X = kl2

X = kl2 - kl1 = k(l2 - l1)

Answer: (2)

AIPMT 2010 (Prelims)

Keep practising — Current Electricity

2

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it ? [figure]

  1. 2 - i2r2 - 1 - i1r1 = 0
  2. - 2 - (i1 + i2)R + i2r2 = 0
  3. 1 - (i1 + i2)R + i1r1 = 0
  4. 1 - (i1 + i2)R - i1r1 = 0
AIPMT 2009
3

A wire of resistance 12 ohms per metre is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is [figure]

  1. 3
  2. 6
  3. 6
  4. 0.6
AIPMT 2009
4

A student measures the terminal potential difference (V) of a cell (of emf and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then respectively, equal

  1. -r and
  2. r and -
  3. - and r
  4. and -r
AIPMT 2009
5

The mean free path of electrons in a metal is 4 10-8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m

  1. 5 10-11
  2. 8 10-11
  3. 5 107
  4. 8 107
AIPMT 2009
6

[figure] In the circuit shown, the current through the 4 resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference between the points M and N is

  1. 0.5 volt
  2. 3.2 volt
  3. 1.5 volt
  4. 1.0 volt
AIPMT 2008
7

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively

  1. both remain the same
  2. 1.1 times, 1.1 times
  3. 1.2 times, 1.1 times
  4. 1.21 times, same
AIPMT 2008
8

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively without and with being short circuited through a resistance of 10 . Its internal resistance is

  1. 2.0 ohm
  2. zero
  3. 1.0 ohm
  4. 0.5 ohm
AIPMT 2008
9

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20 ? The temperature of boiling water is 100

  1. 12.6 min
  2. 4.2 min
  3. 6.3 min
  4. 8.4 min
AIPMT 2008
10

A current of 3 amp. flows through the 2 resistor shown in the circuit. The power dissipated in the 5 resistor is [figure]

  1. 1 watt
  2. 5 watt
  3. 4 watt
  4. 2 watt
AIPMT 2008
11

Three resistances, P, Q, R each of 2 and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6 is connected in parallel to S the bridge gets balanced. What is the value of S?

  1. 3
  2. 6
  3. 1
  4. 2
AIPMT 2007

All Current Electricity PYQs →

PDFDownload Current Electricity PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)