JEE Main 2026 (Online) 8th April Evening Shift | Units & Measurements Question 1 | Physics

A new unit ( $\alpha$ ) of length is chosen such that it is equal to the speed of light in vacuum. What is the distance between Venus and Earth in terms of $\alpha$ units if light takes 6 min. 40 s to cover this distance?

$200 \alpha$

$400 \alpha$

$300 \alpha$

$500 \alpha$

JEE Main 2026 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

-1

Consider the equation $H=\frac{x^p \epsilon^q E^r}{t^s}$

Where $H=$ magnetic field; $E=$ electric field, $\epsilon=$ permittivity, $x=$ distance, $t=$ time The values of $p, q, r$ and $s$ respectively are :

$1, 1, 1, 1$

$-1,1,2,1$

$1, -1, -2, 1$

$-1,-2,-2,1$

JEE Main 2026 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

-1

The percentage error in the calculated volume of a sphere, if there is $2 \%$ error in its diameter measurement, is $\_\_\_\_$ .

JEE Main 2026 (Online) 6th April Evening Shift

MCQ (Single Correct Answer)

-1

$$ \text { Match List - I with List - II. } $$

$$ \text { List - I } $$		$$ \text { List - II } $$
A.	Boltzmann constant	I.	$$ \left[\mathrm{M}^{-1} \mathrm{~L}^3 \mathrm{~T}^{-2}\right] $$
B.	Stefan's constant	II.	$$ \left[\mathrm{M} \mathrm{~L}^2 \mathrm{~T}^{-1}\right] $$
C.	Planck's constant	III.	$$ \left[\mathrm{ML}^2 \mathrm{~T}^{-2} \mathrm{~K}^{-1}\right] $$
D.	Gravitational constant	IV.	$$ \left[\mathrm{M} \mathrm{~L}^0 \mathrm{~T}^{-3} \mathrm{~K}^{-4}\right] $$