JEE Main 2025 (Online) 4th April Evening Shift | Units & Measurements Question 5 | Physics

For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15 cm . The vernier scale attached to the microscope has 25 divisions equals 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

JEE Main 2025 (Online) 4th April Morning Shift

MCQ (Single Correct Answer)

-1

In an electromagnetic system, the quantity representing the ratio of electric flux and magnetic flux has dimension of $M^P L^Q T^R A^S$, where value of ' $Q$ ' and ' $R$ ' are

$(3,-5)$

$(-2,1)$

$(-2,2)$

$(1,-1)$

JEE Main 2025 (Online) 3rd April Evening Shift

MCQ (Single Correct Answer)

-1

$$ \text { Match the LIST-I with LIST-II } $$

LIST-I		LIST-II
A.	$$ \text { Boltzmann constant } $$	I	$$ \mathrm{ML}^2 \mathrm{~T}^{-1} $$
B	$$ \text { Coefficient of viscosity } $$	II	$$ \mathrm{MLT}^{-3} \mathrm{~K}^{-1} $$
C	$$ \text { Planck's constant } $$	III	$$ \mathrm{ML}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1} $$
D	$$ \text { Thermal conductivity } $$	IV	$$ \mathrm{ML}^{-1} \mathrm{~T}^{-1} $$

Choose the correct answer from the options given below:

A - III, B - IV, C - I, D - II

A - III, B - IV, C - II, D - I

A - III, B - II, C - I, D - IV

A - II, B - III, C - IV, D - I

JEE Main 2025 (Online) 3rd April Morning Shift

MCQ (Single Correct Answer)

-1

A person measures mass of 3 different particles as $435.42 \mathrm{~g}, 226.3 \mathrm{~g}$ and 0.125 g . According to the rules for arithmetic operations with significant figures, the addition of the masses of 3 particles will be.

661.845 g

661.84 g

662 g

661.8 g

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