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

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 30^o and 90^o 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

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.

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?

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?

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 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

Magnetic susceptibility of Mg at 300 K is 5 1.2x10^-5 . What is its susceptibility at 200 K ?

Magnetic hysterisis is exhibited by __ magnetic materials.

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

A particle of specific charge \(\frac{q}{m}=\pi Ckg^{-1}\) is projected the origin towards positive x-axis with the velocity 10ms^-1 in a uniform magnetic field \(\overrightarrow{B}=-2\hat{k}T\). The velocity \(\overrightarrow{v}\) of particle after time \(t=\frac{1}{12}s\) will be ( in ms^-1 )

A coil having 9 turns carrying a current produces magnetic filed B₁ at the centre. Now the coil is rewounded into 3 turns carrying same current. Then the magnetic field at the centre B₂=

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 t₁=0°C and t₂=100°C are 50 cm and 60 cm respectively. If the standard resistance taken out is S=4Ω in both trials, the temperature coefficient of the coil is

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