List of top Physics Questions asked in KCET

A proton moving with a momentum $P _{1}$ 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 $P _{2} .$ Then the ratio $\frac{ P _{1}- P _{2}}{ P _{1}}$ is equal to

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 :

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

The resistance of $0.01 \,m \,KCl$ solution at $298\, K$ is $1500\, \Omega$. If the conductivity of $0.01\, m \,KCl$ solution at $298\, K$ is $0.146 \,\times \,10^{-3}\, S \,cm ^{-1} .$ The cell constant of the conductivity cell in $cm ^{-1}$ is

Suppose that the electric field amplitude of electromagnetic wave is $E _{0}=120\, NC ^{-1}$ and its frequency if $f =50 \,MHz$. Then which of the following value incorrectly computed ?

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

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

A toroid with thick windings of $N$ turns has inner and outer radii $R_{1}$ and $R_{2}$ 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

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

The source of electromagnetic wave can be a charge.

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

Two bodies of masses $8\, kg$ are placed at the vertices $A$ and $B$ of an equilateral triangle $A B C$. A third body of mas $2\, kg$ is placed at the centroid $G$ of the triangle. If $AG = BG = CG =1 \,m$, where should a fourth body of mass $4 \,kg$ be placed so that the resultant force on the $2\, kg$ body is zero?

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°.

The circuit given represents which of the logic operations ?

Three phtodiodes D₁, D₂, D₃ are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV respectively. Which one will be able to detect light of wavelength 600 nm?

Identify the incorrect statement :

In a nuclear reactor heavy nuclei is not used as moderators because

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).