List of top Questions asked in KCET

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)
In the diagram shown, the Zener diode has a reverse breakdown voltage of VZ . The current through the load resistance RL is IL The current through the Zener diode is
the Zener diode has a reverse breakdown voltage of VZ
The upper level of valence band and lower level of conduction band overlap in the case of
Depletion region in an unbiased semiconductor diode is a region consisting 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 ratio of volume of Al27 nucleus to its surface area is (Given R0= 1.2x10-15 m)

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
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
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
Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 30o and 90o 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
Three polaroid sheets
A galaxy is moving away from the Earth so that a spectral line at 600 nm is observed at 601 nm . Then the speed of the galaxy with respect to the Earth is
An equiconvex lens of radius of curvature 14 cm is made up of two different materials. Left half and right half of vertical portion is made up of material of refractive index 1.5 and 1.2 respectively as shown in the figure. If a point object is placed at a distance of 40 cm , calculate the image distance.
An equiconvex lens of radius of curvature
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 _____
The final image formed by an astronomical telescope is
Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area A. If I is the intensity of the incident electromagnetic radiation and c is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is
The figure shows variation of R,XL and XC with frequency ' f ' in a series LCR circuit. Then for what frequency point is the circuit capacitive?
LCR circuit
In an LCR series circuit, the value of only capacitance C is varied. The resulting variation of resonance frequency f0 as a function of C can be represented as
Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?
A square loop of side length 'a ' is moving away from an infinitely long current carrying conductor at a constant speed ' v ' as shown. Let ' x ' be the instantaneous distance between the long conductor and side AB . The mutual inductance (M) of the square loop - long conductor pair changes with time (t) according to which of the following graphs?
A square loop
An induced current of 2 A flows through a coil. The resistance of the coil is 10Ω . What is the change in magnetic flux associated with the coil in 1 ms ?
In the figure, a conducting ring of certain resistance is falling towards a current carrying straight long conductor. The ring and conductor are in the same plane. Then the
a conducting ring of certain resistance
A uniform magnetic field of strength B =2mT exists vertically downwards. These magnetic field lines pass through a closed surface as shown in the figure. The closed surface consists of a hemisphere S1 , a right circular cone S2 and a circular surface S3 . The magnetic flux through S1 and S2 are respectively
A uniform magnetic field