Experimental Skills (Physics)

JEE Main 2026 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 3% papers+4−1

Ques. 1JEE Main 2026, 23 January (Evening Shift)

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

1.75
1.55
1.17
1.65

Answer

(3) 1.17

Solution

E1E2 = l1l2

(E1/E2)E1/E2 100 = ( l1l1 + l2l2 ) 100

= ( 1200 + 1150 ) 100

= (0.005 + 0.00667) 100 1.17\%

Answer: (3)

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Ques. 2JEE Main 2026, 22 January (Evening Shift)

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

between the focus (F) and the centre of curvature (C) of the mirror ONLY
between the pole (P) and the focus (F) of the concave mirror ONLY
at any point beyond the focus (F) of the mirror
beyond the centre of the curvature (C) of the mirror ONLY

Ques. 3JEE Main 2025, 4 April (Evening Shift)

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) :

0.002
0.0025
0.0005
0.001

Ques. 4JEE 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:

C, D and E Only
A, B and E Only
A, C and D Only
B, D and E Only

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All JEE Main Physics chapters

Class 11Units and Measurements Motion in a Straight Line Motion in a Plane Laws of Motion Work, Energy and Power System of Particles and Rotational Motion Gravitation Mechanical Properties of Solids Mechanical Properties of Fluids Thermal Properties of Matter Thermodynamics (Physics)Kinetic Theory Oscillations Waves

Class 12Electric Charges and Fields Electrostatic Potential and Capacitance Current Electricity Moving Charges and Magnetism Magnetism and Matter Electromagnetic Induction Alternating Current Electromagnetic Waves Ray Optics and Optical Instruments Wave Optics Dual Nature of Radiation and Matter Atoms Nuclei Semiconductor Electronics Experimental Skills (Physics)