List of top Physics Questions asked in KCET

Which graph in the following diagram correctly represents the potential energy of a pair of nucleons as a function of their separation?

An electron in an excited state of Li²⁺ ion has angular momentum \(\frac{3h}{2\pi}\). The de Broglie wavelength of electron in this state is Pπa₀ (where a₀ = Boh r radius). The value of P is

The figure shows standing de Broglie waves due to the revolution of electron in a certain orbit of hydrogen atom. Then the expression for the orbit radius is (all notations have their usual meanings)

Energy of an electron in the second orbit of hydrogen atom is E₂. The energy of electron in the third orbit of He⁺ will be

According to Einstein’s photoelectric equation to the graph between kinetic energy of photoelectrons ejected and the frequency of incident radiation is

A proton moving with a momentum P₁ has a kinetic energy \(\frac{1}{8}th\) of its rest mass energy. Another light photon having energy equal to the kinetic energy of the possesses a momentum P₂. Then the ratio \(\frac{P_1-P_2}{P_1}\) is equal to

The work function of a metal is 1eV. Light of wavelength 3000Å is incident on this metal surface. The velocity of emitted photoelectrons will be

In the Young’s double slit experiment a monochromatic source of wavelength λ is used. The intensity of light passing through each slit is I₀. The intensity of light reaching the screen S_C at a point P, a distance X from O is given by (Take d << D).

Which of the 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 equal

A slit of width ‘a’ is illuminated by red light of wavelength 6500 A°. If the first diffraction minimum falls at 30°, then the value of ‘a’ is ________

The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the lens, the new size of the image is :

Two thin biconvex lenses have focal lengths f₁ and f₂. A third thin biconcave lens has focal length of f₃. If the two biconvex lenses are in contact, the total power of the lenses is P₁. If the first convex lens is in contact with the third lens, the total power is P₂. If the second lens is in contact with the third lens, the total power is P₃ then

If the refractive index from air to glass is \(\frac{3}{2}\) and that from air to water is \(\frac{4}{3}\), then the ratio of focal lengths of a glass lens in water and in air is

In refraction, light waves are bent on passing from one medium to second medium because, in the second medium.

The source of electromagnetic wave can be a charge.

Suppose that the electric field amplitude of electromagnetic wave is \(E_o=120\ NC^{-1}\) and its frequency if f = 50 MHz. Then which of the following value is incorrectly computed ?

What will be the reading in the voltmeter and ammeter of the circuit shown ?

LC osillations are similar and analogous to the mechanical oscillations of a block attached to a spring. The electrical equivalent of the force constant of the spring is

In an oscillating LC circuit, L = 3.00 mH and C=2.70µF. At t = 0 the charge on the capacitor is zero and the current is 2.00A. The maximum charge that will appear on the capacitor will be :

The physical quantity which is measure in the unit of wb A^-1 is

The current following through an inductance coil of self inductance 6 mH at different time instants is as shown. The emf induced between t = 20s and t = 40s is nearly

Which of the field pattern given below is valid for electric field as well as for magnetic field ?

Earth’s magnetic field always has a horizontal component except at

A tightly wound long solenoid has ‘n’ turns per unit length, a radius ‘r’ and carries a current I. A particle having charge ‘q’ and mass ‘m’ is projected from a point on the axis in a direction perpendicular to the axis. The maximum speed of the particle for which the particle does not strike the solenoid is

A toroid with thick windings of N turns has inner and outer radii R₁ and R₂ respectively. If it carries certain steady current I, the variation of the magnetic field due to the toroid with radial distance is correctly graphed in