COMEDK 2020

When a \(p\)-\(n\) junction diode is connected in forward bias, its barrier potential

A particle executes a linear SHM with an
amplitude of 4 cm. At the mean position the
velocity of the particle is 10 cm/s. What is the
displacement of the particle when its speed
becomes 5 cm/s?

Suppose refractive index \(\alpha\) is given as \(\alpha = A + {B \over {{\lambda ^2}}}\), where A and B are constants and \(\lambda\) is wavelength, then dimensions of B are same as that of

A particle starts moving from point (2, 10, 1). Displacement for the particle is \(8\widehat i - 2\widehat j + \widehat k\). The final coordinates of the particle is

Two identical light waves, propagating in the
same direction, have a phase difference \(\delta\). After
they superpose the intensity of the resulting
wave will be proportional to

A plastic sheet (refractive index = 1 6. ) covers one
slit of a double slit arrangement for the Young’s
experiment. When the double slit is illuminated
by monochromatic light (wavelength = 5867 \(\mathop A\limits^o\)),
the centre of the sc...

The equation of a progressive wave can be given by \(y=15\sin(660\pi t-0.02\pi x)\) cm. The frequency of the wave is

A source of sound gives 5 beats per second, when sounded with another source of frequency 100 s\(^{-1}\). The second harmonic of the source, together with a source of frequency 205 s\(^{-1}\) gives 5 beats per second. What is frequency of t...

A particle of mass m is moving in a horizontal
circle of radius R under a centripetal force equal
to \(-\frac{A}{R^2}\) (A = constant). The total energy of the particle is

A force of 20 N is applied on a body of mass
5 kg resting on a horizontal plane. The body
gains a kinetic energy of 10 J after it moves a
distance 2 m. The frictional force is