List of top Questions asked in KCET- 1999

A mirror forms a real image of unit magnification. Its nature is

Biaxial crystal among the following is

Mass of a photon of frequency v is given by

A body is projected vertically upwards from the surface of a planet of radius $R$ with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is

A mirror forms a real image of unit magnification, Its nature is

Electric charges $+ 10\mu C, + 5\mu C, - 3 \mu C\, and\, + 8 \mu C$ are placed at the comers of a square of side $\sqrt2\,m$. The potential at the centre of the square (V) is

Mean life of a radioactive element is one year. Then its half life is (in year)

Biaxial crystal among the following is

The number of atoms in a radioactive sample reduces from 1000 to 100 in two days. Then the number of atoms remaining at the end of four days is

Ionisation energy of hydrogen atom is 13.6 eV. Then the energy required to ionise a hydrogen atom in which the electron is in the second orbit from the nucleus is (eV)

A convex lens of refractive index $n$ behaves as a convex lens of smaller power in a liquid of refractive index $n_1$ and as a concave lens in another liquid of refractive index $n_2$. Then relation between $n,n_1$ and $n_2$ is

Three similar cells, each of emf 2 V and internal resistance $r\,\Omega$ send the same current through an external resistance of $2\,\Omega$ when connected in series or in parallel. The strength of the current flowing through the external resistance is (A)

Interference fringes are obtained using two coherent sources whose intensities are in the ratio 4 : 1. Then the ratio of the intensities of the bright and dark bands is

S.l. unit of surface tension is

A potentiometer wire of length 1 m and resistance $10\,\Omega$ is connected in series with a cell

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates

If $E_p$ and $E_k$ are the potential energy and kinetic energy of the electron in a stationary orbit in the hydrogen atom, the value of $E_p/E_k$ is

When a thin metal plate is placed in the path of one of the interfering beams of light

A body projected vertically upwards with a velocity u returns to the starting point in $4 s$. If $g = 10 \,m s^{-2}$, the value of $u$ in $m/s$ is

Fertile material among the following is