List of top Questions asked in AP EAPCET

Which of the following are the properties of silicones? I. Water repelling in nature II. High thermal stability III. Easily oxidisable IV. High dielectric strength

White phosphorus reacts with aqueous NaOH solution to form $PH_3(g)$ and aqueous sodium salt of hypophosphorus acid. 12.4 g of white phosphorus was dissolved in 500 mL of xM NaOH solution. The concentration of sodium salt of hypophosphorus acid in the resultant solution was 0.6 mol $L^{-1}$. What is the value of x in mol $L^{-1}$? (P=31u)

What is the work done (in J $mol^{-1}$) to vaporise 1 mole of $H_2O(l)$ to $H_2O(g)$ at 1 bar pressure and $100^{\circ}C$? ($\Delta_{vap}H = 41$ kJ $mol^{-1}$; $\Delta U = 37.9$ kJ $mol^{-1}$)

For a fixed amount of an ideal gas, its pressure is measured as a function of volume at three different temperatures ($T_1, T_2, T_3$). What is the correct order of temperatures? figure [H]

figure

One mole of $A(g)$ was taken in a 1L closed flask and heated to T(K). At equilibrium, the concentration of $A(g)$ is equal to four times the equilibrium concentration of $B(g)$. What is $K_c$ for $A(g) \rightleftharpoons B(g) + C(g)$?

A solution is prepared by adding 0.5 L of 0.5 M NaOH solution to 0.5 L of x M HCOOH solution. The pH of resultant solution is 4.74. What is x in mol $L^{-1}$? (pKa (HCOOH) = 3.74)

What is the bond enthalpy (in kJ $mol^{-1}$) of C-H in ethane? ($\Delta_f H^{\ominus}(C_2H_6(g)) = -85$ kJ $mol^{-1}$; $H_2(g) \rightarrow 2H(g); \Delta_a H^{\ominus} = 435$ kJ $mol^{-1}$; $C(s) \rightarrow C(g); \Delta_a H^{\ominus} = 715$ kJ $mol^{-1}$; $\Delta_a H^{\ominus}(C-C) = 347$ kJ $mol^{-1}$)

A photon of energy 12.09 eV is absorbed by a hydrogen atom in its first excited state, resulting in the ejection of an electron. The kinetic energy (in J) of the emitted photoelectron is ($1 eV = 1.6 \times 10^{-19}$ J, $R_H = 13.6$ eV):

Match the following: figure [H]

figure

Which of the following is the correct increasing order of atomic number of elements A, B and C of third period, if their oxides are amphoteric, basic and acidic in nature respectively?

In the given logic circuit, the bulb will glow for which of the following combinations: figure [H]

figure

Which of the following set of quantum numbers represent the electron with highest energy?

A TV tower has a height of 100m. To double the coverage distance of the tower, the height of the tower must be increased by:

The geometry and hybridisation of central atom of the volatile product formed when calamine is heated are respectively:

A conducting square loop of side L moves with a uniform speed V in a region of uniform magnetic field acting perpendicular to the plane of the loop and directed into it as shown in figure. The emf induced in the loop is:

The energy required to excite an electron from 1st to 3rd Bohr orbit in $Li^{2+}$ ion is:

A series LCR circuit with $R=40~\Omega$, $L=3H$ and $C=20~\mu F$ is connected to a 400 V AC supply with variable frequency. When the frequency of supply equals the natural frequency of the circuit, the average power transferred to the circuit in one complete cycle is:

The magnetic field in a plane electromagnetic wave is $B_y = 2 \times 10^{-7} \sin(0.5 \times 10^3 x + 1.5 \times 10^{11} t)$. The correct expression for electric field of the wave is:

Two radioactive materials $A_1$ and $A_2$ have half-life periods 20 s and 10 s respectively. Initially a mixture of these materials contain 40 g of $A_1$ and 160 g of $A_2$. The time taken for $A_1$ and $A_2$ to become equal in the mixture is:

Two identical parallel metal plates A and B, having fine holes at their centers are connected to a power supply as shown in the figure. An electron having energy 200 eV is directed to pass through these holes from A to B. The de Broglie wavelength of the electron when it comes out of plate B is:

In the part of a circuit shown in figure, determine the current through 20 $\Omega$ resistance, if Potential at 'A' is 30 V, Potential at B = Potential at C = 20 V: figure [H]

figure

A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per mA and Voltage sensitivity is 2 divisions per millivolt. In order to read each division 1 volt, the resistance in ohms to be connected in series is:

If power dissipated in the $9~\Omega$ resistor in the circuit shown is 36 W, the potential difference across the $2~\Omega$ resistor is: figure [H]

figure

A magnetic needle kept in a non-uniform magnetic field experiences:

When dielectric is inserted between the plates of a capacitor with battery connected, energy increases because of: