List of top Physics Questions asked in KCET

A mass of $10\,kg$ is suspended from a spring balance. It is pulled aside by a horizontal string so that it makes an angle of $60^\circ$ with the vertical. The new reading of the balance is
Two identical metal spheres charged with $+12 \mu F$ and $-8 \mu F$ are kept at certain distance in air. They are brought into contact and then kept at the same distance. The ratio of the magnitudes of electrostatic forces between them before and after contact is
Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are $46^\circ$, $44^\circ$ and $43^\circ$ respectively. The arrangement will separate
The value of alternating emf $E$ in the given circuit will be
On bombarding $U^{235}$ by slow neutron, $200\, MeV$ energy is released. If the power output of atomic reactor is $1.6\, MW$, then the rate of fission will be
The equation of a simple harmonic wave is given by $y = 6\, Sin\, 2\pi(2t - 0.1x)$, where $x$ and $y$ are in $mm$ and $t$ is in seconds. The phase difference between two particles $2\, mm$ apart at any instant is
The moment of inertia of a thin circular disc about an axis passing through its center and perpendicular to its plane is $1$. Then, the moment of inertia of the disc about an axis parallel to its diameter and touching the edge of the rim is
The ratio of the nuclear radii of elements with mass numbers $216$ and $125$ is
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 ?
A fish in water (refractive index $n$) looks at a bird vertically above in the air. If $y$ is the height of the bird and $x$ is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is
A body is projected vertically upwards. The times corresponding to height $h$ while ascending and while descending are $t_1$ and $t_2$ respectively. Then the velocity of projection is ($g$ is acceleration due to gravity).
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
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
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
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
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