22 verified questions · ~24 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
The equation of a transverse wave travelling along a string is y(x, t) = 4.0 sin[20 × 10⁻³ x + 600t] mm, where x is in mm and t is in second. The velocity of the wave is:
A plane electromagnetic wave of frequency 20 MHz travels in free space along the +x direction. At a particular point in space and time, the electric field vector of the wave is Eᵧ = 9.3 V m⁻¹. Then, the magnetic field vector of the wave at that point is
Answers are revealed after you attempt — that's what makes the diagnosis honest.