Doubtclip is an AI tutor that turns any homework or exam doubt into a step-by-step whiteboard video lesson with diagrams, formulas, and voice explanation.

Which subjects and exams does it support?

It supports Physics, Chemistry, Mathematics/Calculus and related STEM doubts for school boards, JEE, NEET, and global high-school / undergrad practice.

How do I get a video solution?

Upload a photo of the question or paste the text, sign in, and Doubtclip generates a whiteboard-style explanation video you can watch and share.

Is Doubtclip available worldwide?

Yes. Doubtclip is a web app for students globally. Lessons are available in English and Hinglish.

Units & Dimensions

JEE Main level, single correct, medium

99 of 149

Question 99 of 149

Which of the following equations is dimensionally incorrect?
Where $t=$ time, $h=$ height, $s=$ surface tension, $\theta =$ angle, $\rho =$ density $,a,r=$ radius, $g=$ the acceleration due to gravity, $V=$ volume, $p=$ pressure, $W=$ work done, $\tau =$ torque, $ϵ=$ permittivity, $E=$ electric field, $J=$ current density, $L=$ length.

Show answer and solution

Answer: (B) $V=\dfrac{\pi p{a}^{4}}{8\eta L}$

Dimensions of

\dfrac{\pi p{a}^{4}}{8\eta L}

(volume flow rate) is

{L}^{3}{T}^{–1}

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

More Physics practice

JEE Main Physics practice question on Units & Dimensions (Dimensions), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.