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Experimental Skills (Physics)

JEE Main 2025 (Online) 28th January Morning ShiftMCQMedium📈 Topic in 2% papers+4−1
Ques. 1JEE Main 2025, 28 January (Morning Shift)

In the experiment for measurement of viscosity ' ' of given liquid with a ball having radius R, consider following statements. Choose the correct answer from the options given below:

  1. C, D and E Only
  2. A, B and E Only
  3. A, C and D Only
  4. B, D and E Only

Answer

(3) A, C and D Only

Solution

Terminal velocity: V = 2R2( - )g9 ( = density of ball, = density of liquid)

A: V R2 the V–R graph is a parabola. Correct.

B: V depends on R, so balls of different diameters have different terminal velocities. Incorrect.

C: of a liquid decreases as temperature rises, so the terminal velocity depends on temperature. Correct.

D: With known, = - 9 V2R2 g, so the density of the liquid can be found. Correct.

E: is a property of the liquid (at a given temperature); an initial speed only changes the time taken to reach V. Incorrect.

A, C and D only are correct.

Answer: (3)

Keep practising — Experimental Skills (Physics)

Ques. 2JEE Main 2024, 6 April (Evening Shift)

In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale divisions = 49 MSD; 20 divisions on main scale in each cm For mark on paper MSR = 8.45 cm, VC = 26 For mark on paper seen through slab MSR = 7.12 cm, VC = 41 For powder particle on the top surface of the glass slab MSR = 4.05 cm, VC = 1 (MSR = Main Scale Reading, VC = Vernier Coincidence) Refractive index of the glass slab is :

  1. 1.52
  2. 1.35
  3. 1.24
  4. 1.42
Ques. 3JEE Main 2024, 5 April (Morning Shift)

In the experiment to determine the galvanometer resistance by half-deflection method, the plot of 1/ vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is 10-1 A/division. [The source has emf 2 V] [figure]

Ques. 4JEE Main 2024, 4 April (Morning Shift)

In an experiment to measure focal length (f) of convex lens, the least counts of the measuring scales for the position of object (u) and for the position of image (v) are u and v, respectively. The error in the measurement of the focal length of the convex lens will be:

  1. 2f [ uu+ vv ]
  2. f [ uu+ vv ]
  3. f2 [ uu2+ vv2 ]
  4. uu+ vv

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All JEE Main 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
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