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Experimental Skills (Physics) · Question 4

JEE Main 2025 (Online) 28th January Morning ShiftMCQMedium📈 Topic in 3% papers+4−1
1

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)

JEE Main 2025 (Online) 28th January Morning Shift

Keep practising — Experimental Skills (Physics)

2

To compare EMF of two cells using potentiometer the balancing lengths obtained are 200 cm and 150 cm. The least count of scale is 1 cm. The percentage error in the ratio of EMFs is

  1. 1.75
  2. 1.55
  3. 1.17
  4. 1.65
JEE Main 2026 (Online) 23rd January Evening Shift
3

In parallax method for the determination of focal length of a concave mirror, the object should always be placed:

  1. between the focus (F) and the centre of curvature (C) of the mirror ONLY
  2. between the pole (P) and the focus (F) of the concave mirror ONLY
  3. at any point beyond the focus (F) of the mirror
  4. beyond the centre of the curvature (C) of the mirror ONLY
JEE Main 2026 (Online) 22nd January Evening Shift
4

For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equal to 15 cm. The vernier scale attached to the microscope has 25 divisions equal to 24 divisions of main scale. The least count (LC) of the travelling microscope is (in cm) :

  1. 0.002
  2. 0.0025
  3. 0.0005
  4. 0.001
JEE Main 2025 (Online) 4th April Evening Shift

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