List of top Physics Questions asked in KCET

The coefficient of thermal conductivity of copper is $9$ times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel ?
Two similar circular loops carry equal currents in the same direction. On moving the coils further apart, the electric current will
The potential difference between $A$ and $B$ in the following figure is
Blue colour of sea water is due to
A string vibrates with a frequency of $200 \,Hz$. When its length is doubled and tension is altered, it begins to vibrate with a frequency of $300\, Hz$. The ratio of the new tension to the original tension is
A current of $5\,A$ is flowing at $220 \,V$ in the primary coil of a transformer. If the voltage produced in the secondary coil is $2200\, V$ and $50\%$ of power is lost, then the current in the secondary will be
A circular coil carrying a certain current produces a magnetic field $B_o$ at its centre. The coil is now rewound so as to have $3\, turns$ and the same current is passed through it. The new magnetic field at the centre is
In Young?? double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is
The potential of the electric field produced by a point charge at any point $(x, y, z)$ is given by $V= 3x^{2} + 5$ , where $x, y, z$ are in metres and $V$ is in volts. The intensity of the electric field at $(-2,1,0)$ is
A shell of mass $20\,kg$ at rest explodes into two fragments whose masses are in the ratio $2 : 3$. The smaller fragment moves with a velocity of $6 \,m/s$. The kinetic energy of the larger fragment is
In Raman effect, Stoke's lines are spectral lines having
The equation to two circles which touch the Y-axis at $(0, 3)$ and make an intercept of $8$ units on X-axis are
The principle of $LASER$ action involves
Light from two coherent sources of the same amplitude $A$ and wavelength $\lambda$ illuminates the screen. The intensity of the central maximum is $I_0$. If the sources were incoherent, the intensity at the same point will be
A prism of a certain angle deviates the red and blue rays by $8^\circ$ and $12^\circ$ respectively. Another prism of the same angle deviates the red and blue rays by $10^\circ$ and $14^\circ$ respectively. The prisms are small angled and made of different materials. The dispersive powers of the materials of the prisms are in the ratio
The maximum height attained by a projectile when thrown at an angle $\theta $ with the horizontal is found to be half the horizontal range. Then $\theta $ =
The dimensional formula for impulse is
The de Broglie wavelength of a proton (charge = $1.6\times10^{-19}C$ mass = $1.6\times10^{-27} kg)$ accelerated through a p.d of $1\, kV$ is
Minority carriers in a $p-type$ semiconductor are
In the Wheatstone's network given below $P=10 \, \Omega$ $Q=20 \, \Omega$ $R=15 \, \Omega$ $S=30 \, \Omega$ The current passing through the battery (of negligible internal resistance) is
The surface temperature of the Sun which has maximum energy emission at $500 \,nm$ is $6000 \,K$. The temperature of a star which has maximum energy emission at $400\, nm$ will be
In a reverse biased diode when the applied voltage changes by $1\, V$, the current is found to change by $0.5\, \mu\,A$ . The reverse bias resistance of the diode is
When the angle of incidence is $60^\circ$ on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
A single slit Fraunhoffer diffraction pattern is formed with white light. For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength $6500 \, \mathring{A}$ ?
The head lights of a jeep are $1.2\, m$ apart. If the pupil of the eye of an observer has a diameter of $2\, mm$ and light of wavelength $5896\, ?$ is used, what should be the maximum distance of the jeep from the observer if the two head lights are just separated?