KCET 2021

Two thin biconvex lenses have focal lengths \(f_1\) and \(f_2\). A third thin biconcave lens has focal length of \(f_3\). If the two biconvex lenses are in contact, then the total power of the lenses is \(P_1\). If the first convex lens is ...

In figure \(E\) and \(v_{\mathrm{cm}}\) represent the total energy and speed of centre of mass of an object of mass \(1 \mathrm{~kg}\) in pure rolling. The object is

Identify the incorrect statement.

Three photodiodes \(D_1, D_2\) and \(D_3\) are made of semiconductors having band gaps of \(2.5 \mathrm{~eV}, 2 \mathrm{~eV}\) and \(3 \mathrm{~eV}\), respectively. Which one will be able to detect light of wavelength \(600 \mathrm{~nm}\) ?

The circuit given represents which of the logic operations?

A pendulum oscillates simple harmonically and only if
I. the sizer of the bob of pendulum is negligible in comparison with the length of the pendulum.
II. the angular amplitude is less than \(10^{\circ}\).
Choose the correct option.

Which of the following statements are correct with reference to single slit diffraction pattern?
(I) Fringes are of unequal width.
(II) Fringes are of equal width.
(III) Light energy is conserved.
(IV) Intensities of all bright fringes are ...

A slit of width \(a\) is illuminated by red light of wavelength \(6500 \mathop A\limits^o\). If the first diffraction minimum falls at \(30^{\circ}\), then the value of \(a\) is

In the Young's double slit experiment a monochromatic source of wavelength \(\lambda\) is used. The intensity of light passing through each slit is \(I_0\). The intensity of light reaching the screen \(S_C\) at a point \(P\), a distance $$x...

To propagate both longitudinal and transverse waves, a material must have