List of top Physics Questions asked in KCET

When a soap bubble is charged ?
Figure shows three points A, B and C in a region of uniform electric field \(\overrightarrow{E}\). The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good? (VA, VB and VC represent the electric potential at points A, B and C respectively)
Figure shows three points A, B and C in a region
The difference between equivalent capacitances of two identical capacitors connected in parallel to that in series is $6 \,\mu F$ . The value of capacitance of each capacitor is
A dipole of dipole moment 'P' and moment of inertia I is placed in a uniform electric field \(\overrightarrow{E}\). If it is displaced slightly from its stable equilibrium position, the period of oscillation of dipole is
An infinitely long thin straight wire has uniform charge density of $\frac {1}{4} \times 10^{-2} cm^{-1}.$ What is the magnitude of electric field at a distance $20\, cm$ from the axis of the wire ?
The electric field lines on the left have twice the separation on those on the right as shown in figure. If the magnitude of the field at $A$ is $40\,Vm^{-1}$, what is the force on $20\,\mu \,C$ charge kept at $B$?
A train whistling at constant frequency 'n' is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency 'n' of the sound as heard by the observer is plotted as a function of time 't'. Identify the correct curve
A tray of mass $12 \,kg$ is supported by two identical springs as shown in figure. When the tray is pressed down slightly and then released, it executes SHM with a time period of $1.5\,s$. The spring constant of each spring is
A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy is converted into work ?
In an adiabatic expansion of an ideal gas the product of pressure and volume
A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature are allowed to cool down under similar conditions. Then the
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is $\rho_i = 0.917 \,g\,cm^{-3}$ ?
A wheel starting from rest gains an angular velocity of $10$ rad/s after uniformly accelerated for $5$ sec. The total angle through which it has turned is
Young's modulus of a perfect rigid body is
The value of acceleration due to gravity at a height of $10\,km$ from the surface of earth is $x$. At what depth inside the earth is the value of the acceleration due to gravity has the same value $x$?
At a metro station, a girl walks up a stationary escalator in $20 \,sec$. If she remains stationary on the escalator, then the escalator take her up in $30 \,sec$. The time taken by her to walk up on the moving escalator will be
In the following circuit what are $P$ and $Q$:
A positive hole in a semiconductor is
Two long straight parallel wires are a distance $2 d$ apart. They carry steady equal currents flowing out of the plane of the paper. The variation of magnetic field $B$ along the line $xx'$ is given by
One end of a string of length $'l'$ is connected to a particle of mass �m� and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed �v�, the net force on the particle (directed towards the centre) is : (T is the tension in the string)
Three polaroid sheets $P_1, P_2$ and $P_3$ are kept parallel to each other such that the angle between pass axes of $P_1$ and $P_2$ is $45^\circ$ and that between $P_2$ and $P_3$ is $45^\circ$. If unpolarised beam of light of intensity $128 Wm^{-2}$ is incident on $P_1$. What is the intensity of light coming out of $P_3$?
A radio-active elements has half-life of $15$ years. What is the fraction that will decay in $30$ years?
The trajectory of a projectile projected from origin is given by the equation y = x - $\frac{2x^2}{5}$ . The initial velocity of the projectile is
A capacitor of capacitance C charged by an amount Q is connected in parallel with an uncharged capacitor of capacitance 2C. The final charges on the capacitors are
Due to Doppler?? effect the shift in wavelength observed is 0.1 ? for a star producing wavelength 6000 ?. Velocity of recession of the star will be