List of top Physics Questions asked in KCET

\( \overrightarrow{E} \) is the electric field inside a conductor whose material has conductivity \( \sigma \) and resistivity \( \rho \). The current density inside the conductor is \( \overrightarrow{j} \). The correct form of Ohm's law is

A capacitor of capacitance 5$\mu$F is charged by a battery of emf 10V. At an instant of time, the potential difference across the capacitors is 4V and the time rate of change of potential difference across the capacitor is 0.6 V/s. Then the time rate at which energy is stored in the capacitor at the instant is

A motor-cyclist moving towards a huge cliff with a speed of 18 km/h, blows a horn of source frequency 325 Hz. If the speed of the sound in air is 330 m/s, the number of beats heard by him is

A point charge A of +10\mu C and another point charge B of +20\mu C are kept 1m apart in free space. The electrostatic force on A due to B is \( \overrightarrow{F}_1 \), and the electrostatic force on B due to A is \( \overrightarrow{F}_2 \). Then

Under electrostatic condition of a charged conductor, which among the following statements is true?

The total electric flux through a closed spherical surface of radius \( r \) enclosing an electric dipole of dipole moment \( 2aq \) is (Give \( \epsilon_0 \) = permittivity of free space)

A body has a charge of \( -3.2 \mu C \). The number of excess electrons it has is

A uniform electric field \( E = 3 \times 10^3 \, \text{N/C} \) is acting along the positive Y-axis. The electric flux through a rectangle of area \( 10 \, \text{m} \times 30 \, \text{m} \), where the plane of the rectangle is parallel to the Z-X plane is

For a particle executing simple harmonic motion (SHM), at its mean position:

The ratio of molar specific heats of oxygen is

A uniform electric field vector \(\vec{E}\) exists along horizontal direction as shown. The electric potential at A is V_A . A small point charge q is slowly taken from A to B along the curved path as shown. The potential energy of the charge when it is at point B 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 ]

The true length of a wire is 3.678 cm. When the length of this wire is measured using instrument A, the length of the wire is 3.5 cm. When the length of the wire is measured using instrument B, it is found to have length 3.38 cm. Then the

A 60 W source emits monochromatic light of wavelength 662.5 nm. The number of photons emitted per second is

In the Young’s double slit experiment, the intensity of light passing through each of the two double slits is 2 × 10^-2 Wm^-2. The screen-slit distance is very large in comparison with slit-slit distance. The fringe width is β. The distance between the central maximum and a point P on the screen is \(\frac{\beta}{3}\). Then the total light intensity at that point 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

Three energy levels of hydrogen atom and the corresponding wavelength of the emitted radiation due to different electron transition are as shown. Then

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

For a point object, which of the following always produces virtual image in air?

The ratio of the magnitudes of electric field to the magnetic field of an electromagnetic wave is of the order of

Total impedance of a series LCR circuit varies with angular frequency of the AC source connected to it as shown in the graph. The quality factor Q of the series LCR circuit is

When light propagates through a given homogeneous medium, the velocities of

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.

An equiconvex lens made of glass of refractive index \(\frac{3}{2}\) has focal length f in air. It is completely immersed in water of refractive index \(\frac{4}{3}\). The percentage change in the focal length is