KCET 2020

A thin uniform rectangular plate of mass \(2 \mathrm{~kg}\) is placed in \(x y\)-plane as shown in figure. The moment of inertial about \(x\)-axis is \(I_x=0.2 \mathrm{~kgm}^2\) and the moment of inertia about \(Y\)-axis is $$I_y=0.3 \mathr...

A positive hole in a semiconductor is

In the following circuit what are P and Q

A tray of mass \(12 \mathrm{~kg}\) is supported by two identical springs as shown in figure. When the tray is pressed down slightly and then released, it executes SHM with a time period of \(1.5 \mathrm{~s}\). The spring constant of each sp...

A cylindrical wire has a mass \((0.3 \pm 0.003) \mathrm{g}\), radius \((0.5 \pm 0.005) \mathrm{mm}\) and length \((6 \pm 0.06) \mathrm{cm}\). The maximum percentage error in the measurement of its density is

In Young's double slit experiment, the distance between the slits and the screen is \(1.2 \mathrm{~m}\) and the distance between the two slits is \(2.4 \mathrm{~mm}\). If a thin transparent mica sheet of thickness \(1 \mu \mathrm{m}\) and R...

Three polaroid sheets \(P_1, P_2\) and \(P_3\) are kept parallel to each other such that the angle between pass axes of \(P_1\) and \(P_2\) is \(45^{\circ}\) and that between \(P_2\) and \(P_3\) is \(45^{\circ}\). If unpolarised beam of lig...

Two poles are separated by a distance of \(3.14 \mathrm{~m}\). The resolving power of human eye is \(1 \mathrm{~min}\) of an arc. The maximum distance from which he can identify the two poles distinctly is

A train whistling at constant frequency \(n\) is moving towards a station at a constant speed \(v\). The train goes past a stationary observer on the station. The frequency \(n\) of the sound as heard by the observer is plotted as a functio...

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time \(t\) is proportional to