List of top Physics Questions asked in KCET

A particle of mass 500 g is at rest. It is free to move along a straight line. The power delivered to the particle varies with time according to the following graph :
The momentum of the particle at t=5s is

One mole of an ideal monoatomic gas is taken round the cyclic process MNOM. The work done by the gas is

A solid cube of mass m at a temperature $θ_0$ is heated at a constant rate. It becomes liquid at temperature $θ_1$ and vapour at temperature $θ_2$ . Let $s_1$ and $s_2$ be specific heats in its solid and liquid states respectively. If $L_f$ and $L_v$ are latent heats of fusion and vaporisation respectively, then the minimum heat energy supplied to the cube until it vaporises is

Water flows through a horizontal pipe of varying cross-section at a rate of $0.314 m^3s^{-1}$. The velocity of water at a point where the radius of the pipe is 10 cm is

A thick metal wire of density A thick metal wire of density ρ and length ‘L’ is hung from a rigid support. The increase in length of the wire due to its own weight is (Y=Young’s modulus of the material of the wire)and length ‘L’ is hung from a rigid support. The increase in length of the wire due to its own weight is (Y=Young’s modulus of the material of the wire)

What is the value of acceleration due to gravity at a height equal to half the radius of the Earth, from its surface ?

A body of mass 1 kg is suspended by a weightless string which passes over a frictionless pulley of mass 2 kg as shown in the figure. The mass is released from a height of 1.6m from the ground. With what velocity does it strike the ground ?

Dimensional formula for activity of a radioactive substance is

A block of certain mass is placed on a rough inclined plane. The angle between the plane and the horizontal is $30^0$. The coefficients of static and kinetic frictions between the block and the inclined plane are 0.6 and 0.5 respectively. Then the magnitude of the acceleration of the block is [Take g=10 ms-2]

Among the given pair of vectors, the resultant of two vectors can never be 3 units. The vectors are

An athlete runs along a circular track of diameter 80m. The distance travelled and the magnitude of displacement of the athlete when he covers $\frac{3^{th}}{4}$ of the circle is ( in m)

A p -n junction diode is connected to a battery of emf 5.7 V in series with a resistant 5kΩ such that it is forward biased. If the barrier potential of the diode is 0.7 V, neglecting the diode resistance, the current in the circuit is

In the diagram shown, the Zener diode has a reverse breakdown voltage of V_Z . The current through the load resistance R_L is I_L The current through the Zener diode is

Depletion region in an unbiased semiconductor diode is a region consisting of

The upper level of valence band and lower level of conduction band overlap in the case of

The natural logarithm of the activity R of a radioactive sample varies with time t as shown. At t=0, there are N₀ undecayed nuclei. Then N₀ is equal to [Take e²= 7.5]

Consider the nuclear fission re action  Assuming all the kinetic energy is carried away by the fast neutrons only
and total binding energies of    MeV and 780 MeV respectively, the average kinetic energy
carried by each fast neutron is (in MeV)

The photoelectric work function for photo metal is 2.4eV . Among the four wavelengths, the wavelength of light for which photoemission does not take place is

The ratio of area of first excited state to ground state of orbit of hydrogen atom is

In alpha particle scattering experiment, if v is the initial velocity of the particle, then the distance of closest approach is d. If the velocity is doubled, then the distance of closest approach becomes

Light of energy E falls normally on a metal of work function $\frac{E}{3}$. The kinetic energies (K) of the photo electrons are

In Young's double slit experiment, an electron beam is used to produce interference fringes of width β1 . Now the electron beam is replaced by a beam of protons with the same experimental set-up and same speed. The fringe width obtained is β2 . The correct relation between β1 and β2 is

If the angle of minimum deviation is equal to angle of a prism for an equilateral prism, then the speed of light inside the prism is _____

Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 30^o and 90^o with pass axis of polaroid sheet 1. If I₀ is the intensity of the incident unpolarised light entering sheet 1, the intensity of the emergent light through sheet 3 is