List of top Physics Questions asked in KCET

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

The figure shows variation of \( R \), \( X_L \), and \( X_C \) with frequency \( f \) in a series LCR circuit. Then for what frequency point is the circuit capacitive?

The final image formed by an astronomical telescope is

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

A luminous point object O is placed at a distance \( 2R \) from the spherical boundary separating two transparent media of refractive indices \( n_1 \) and \( n_2 \), where \( R \) is the radius of curvature of the spherical surface. If \( n_1 = \frac{3}{2} \), \( n_2 = 3 \), and the image is obtained at a distance from P equal to

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.

A galaxy is moving away from the Earth so that a spectral line at 6000 Å is observed at 6300 Å. Then the speed of the galaxy with respect to the Earth 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

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

In an LCR series circuit, the value of only capacitance \( C \) is varied. The resulting variation of resonance frequency \( f_0 \) as a function of \( C \) can be represented as

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 uniform magnetic field of strength \( B = 2 \, \text{mT} \) exists vertically downwards. These magnetic field lines pass through a closed surface as shown in the figure. The closed surface consists of a hemisphere \( S_1 \), a right circular cone \( S_2 \), and a circular surface \( S_3 \). The magnetic flux through \( S_1 \) and \( S_2 \) are respectively

An induced current of 2 A flows through a coil. The resistance of the coil is 100 \( \Omega \). What is the change in magnetic flux associated with the coil in 1 ms?

Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?

The magnetic field at the centre of a circular coil of radius \( R \) carrying current \( I \) is 64 times the magnetic field at a distance \( x \) on its axis from the centre of the coil. Then the value of \( x \) is

Magnetic hysteresis is exhibited by magnetic materials.

A coil having 9 turns carrying a current produces a magnetic field \( B_1 \) at the centre. Now the coil is rewound into 3 turns carrying the same current. Then the magnetic field at the centre \( B_2 \) is:

Magnetic susceptibility of Mg at 300 K is \( 1.2 \times 10^{-5} \). What is its susceptibility at 200 K?

A particle of specific charge \( \frac{q}{m} \) is projected from the origin towards the positive x-axis with the velocity \( 10 \, \text{m/s} \) in a uniform magnetic field \( B = -2 \hat{k} \, \text{T} \). The velocity \( v \) of the particle after time \( t = 5 \, \text{ms} \) will be (in m/s)

A moving electron produces

In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures \( t_1 = 0^\circ \text{C} \) and \( t_2 = 100^\circ \text{C} \) are 50 cm and 60 cm respectively. If the standard resistance taken out is \( S = 4 \, \Omega \) in both trials, the temperature coefficient of the coil is

An electric bulb of 60 W, 120 V is to be connected to a 220 V source. What resistance should be connected in series with the bulb, so that the bulb glows properly?

The I-V graph for a conductor at two different temperatures 100°C and 400°C is as shown in the figure. The temperature coefficient of resistance of the conductor is about (in per degree Celsius)

A cube of side 1 cm contains 100 molecules each having an induced dipole moment of \( 0.2 \times 10^{-16} \, \text{C} \cdot \text{m} \) in an external electric field of \( 4 \times 10^4 \, \text{N/C} \). The electric susceptibility of the materials 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