List of top Questions asked in AP EAPCET

Identify the pairs of elements, which possess almost the same size as well as properties

In how many of the above molecules ($PF_5, H_2O, NH_3, XeF_2, BF_3, SF_6, IF_7$), the ratio between the number of bond pairs of electrons and lone pairs of electrons is 1:3?

The number of Pi ($\pi$) bonds in $C_2H_4, C_2H_2$ and $C_2N_2$ is x, y and z respectively. The sum of x, y and z is equal to:

If the velocity of an electron in the first Bohr's orbit of H-atom is x $ms^{-1}$, then the velocity (in $ms^{-1}$) of an electron in the fourth Bohr's orbit of the same atom is:

The difference between the radii of M and N shells of $He^+$ is $\Delta R_1$(nm). The difference between the radii of L and N shells of $Li^{2+}$ is $\Delta R_2$(nm). The ratio of $\Delta R_1$ to $\Delta R_2$ is:

Over modulation occurs when modulation index 'm' is:

If decay constant of a radioactive element doubles, then its half-life time becomes:

In hydrogen atom, if the kinetic energy of an electron in an orbit having angular momentum $2h/\pi$ is E, then the potential energy of the electron in the first orbit of hydrogen atom is:

If the average energy density of the electric field of an electromagnetic wave is $U_E$ and the average energy density of the magnetic field of the wave is $U_B$, then:

The energy of a photon of wavelength 2500 is 4.96 eV. When photons of wavelength 3100 incident on a photosensitive material of work function 2.2 eV, the maximum velocity of the emitted photoelectrons is:

For the circuit given below, which of the following is correct option?

A resistor of resistance 30 $\Omega$ and a capacitor of reactance 40 $\Omega$ are connected in series to an ac supply. If the rms current through the resistor is 2 mA, then the wattless current is:

Two conducting thin concentric shells of radii $r$ and $2r$ are shown. Outer shell carries a charge Q. Inner shell is neutral. The charge that will flow from the inner shell to earth after closing the switch $s$ is: figure [H]

figure

If the horizontal component of earth's magnetic field at a place is $2.8 \times 10^{-5}$ T and the magnetic field of the earth at this place is $5.6 \times 10^{-5}$ T, then the inclination at the place is:

The mutual inductance of a pair of adjacent coils is 5 H. If the current in one coil changes from 0 to 12 A in a time of 0.75 s, then the change of flux linkage with the other coil is:

If a straight infinitely long horizontal wire carries a current of 50 A in east-west direction, then the magnitude of the magnetic field due to the current at a vertical distance of 2 m above the wire is:

If a wire of length 196 cm carrying a current of 0.98 A is bent in the form of a circular loop of two turns, then the magnetic field at the centre of the loop is approximately:

Two waves of wavelengths 50 cm and 51 cm produce 12 beats per second. The velocity of sound is:

The electric field intensity on the surface of a charged sphere of radius R and volume charge density $\rho$ is:

Three capacitors each of capacitance 10 $\mu$F are to be connected such that the effective capacitance becomes 15 $\mu$F. This can be done by connecting:

Young's double slit experiment setup is in such a way that, when path difference is $\lambda$, then intensity at a point is I. If the path difference is $\lambda/4$, then intensity at the same point is:

A ray of light is incident on a glass plate of refractive index $\sqrt{3}$. If the angle between the refracted ray and reflected ray is $90^\circ$, then the angle of incidence is:

Three identical conductors A, B, and C are in contact. Thermal conductivities are k, 2k, and k/2 respectively. A is at $100^\circ C$ and C is at $0^\circ C$. During steady state, the junction temperature between A and B is nearly:

100 gm of copper is heated to increase its temperature by $21^\circ C$. If the same amount of heat is given to 50 gm of water, then the rise in its temperature is (Specific heat of Cu = $400~J~kg^{-1}K^{-1}$, Water = $4200~J~kg^{-1}K^{-1}$):

A thermally insulated vessel contains an ideal gas of molecular weight M and specific heat ratio $\gamma$. If it is moving with speed V and suddenly brought to rest, the temperature increase is: