List of top Physics Questions asked in KCET

The Curie temperatures of Cobalt and iron are 1400K and 1000K respectively. At T = 1600K , the ratio of magnetic susceptibility of Cobalt to that of iron is
The P-V diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the P-V diagram is
[ The heat supplied to the gas is 8000 J ]
P-V diagram of a Carnot's Engine
A point object is moving at a constant speed of 1 ms-1 along the principal axis of a convex lens of focal length 10cm. The speed of the image is also 1 ms-1 , when the object is at _______ cm from the optic centre of the lens.
Three energy levels of hydrogen atom and the corresponding wavelength of the emitted radiation due to different electron transition are as shown. Then
Three energy levels of hydrogen atom
A cubical Gaussian surface has side of length a = 10 cm. Electric field lines are parallel to x-axis as shown. The magnitudes of electric fields through surfaces ABCD and EFGH are 6kNC-1 and 9kNC-1 respectively. Then the total charge enclosed by the cube is
[Take ε0 = 9 × 10-12 Fm-1]
cubical Gaussian surface
When a p-n junction diode is in forward bias, which type of charge carriers flows in the connecting wire?
For a given electric current the drift velocity of conduction electrons in a copper wire is vd and their mobility is μ . When the current is increased at constant temperature
The horizontal component of Earth’s magnetic field at a place is 3 × 10-5 T. If the dip at that place is 45°, the resultant magnetic field at that place is
The speed of sound in an ideal gas at a given temperature T is v. The rms speed of gas molecules at that temperature is vrms. The ratio of the velocities v and vrms for helium and oxygen gases are X and X' respectively. Then \(\frac{X}{X'}\) is equal to
A particle is in uniform circular motion. Related to one complete revolution of the particle, which among the stataments is incorrect ?
Five capacitors each of value 1 μF are connected as shown in the figure. The equivalent capacitance between A and B is
Five capacitors each of value 1 μF
100 g of ice at 0 °C is mixed with 100 g of water at 100 °C. The final temperature of the mixture is
[Take Lf= 3.36 × 105 J kg-1 and Sw = 4.2 × 103 J kg-1 k-1]
A body of mass 10 kg is kept on a horizontal surface. The coefficient of kinetic friction between the body and the surface is 0.5. A horizontal force of 60N is applied on the body. The resulting acceleration of the body is about
An ideal transfomer has a turns ratio of 10. When the primary is connected to 220V,50Hz ac source, the power output is
A ball of mass 0.2 kg is thrown vertically down from a height of 10 m. It collides with the floor and loses 50% of its energy and then rises back to the same height. The value of its initial velocity is
The four bands of a colour coded resistor are of the colours gray, red, gold and gold. The value of the resistance of the resistor is
A nucleus with mass number 220 initially at rest emits an alpha particle. If the Q value of reaction is 5.5 MeV, calculate the value of kinetic energy of alpha particle.
The energy gap of an LED is 2.4 eV. When the LED is switched ‘ON’, the momentum of the emitted photons is
In the situation shown in the diagram, magnitude of q << | Q | and r>>a. The net force on the free charge -q and net torque on it about O at the instant shown are respectively
[ p = 2aQ is the dipole moment ]
diagram of particles and free charge and net torque
A 60 W source emits monochromatic light of wavelength 662.5 nm. The number of photons emitted per second is
An unpolarised light of intensity I is passed through two polaroids kept one after the other with their planes parallel to each other. The intensity of light emerging from second polaroid is \(\frac{I}{4}\). The angle between the pass axes of the polaroids is
In the Rutherford’s alpha scattering experiment, as the impact parameter increases, the scattering angle of the alpha particle
In an experiment to study photo-electric effect the observed variation of stopping potential with frequency of incident radiation is as shown in the figure. The slope and y-intercept are respectively
observed variation of stopping potential with frequency of incident radiation
For a point object, which of the following always produces virtual image in air?
In series LCR circuit at resonance, the phase difference between voltage and current is