List of top Questions asked in AP EAPCET

For the reaction, \(2Al_{2}O_{3}(s) \rightarrow 4Al(s) + 3O_{2}(g)\), \(\Delta H = +3340\,\text{kJ}\). What is the enthalpy of formation of \(Al_{2}O_{3}(s)\) (in kJ)?

At 27^C, 1.6 g of O$_2$ gas at 5 atm expands isothermally against a constant external pressure of 1 atm. The work done (in J) is (1 L-atm = 100 J):

If the molar masses of Na$_2$S$_2$O$_3$ and I$_2$ are M$_1$ and M$_2$ respectively, then the equivalent weights of Na$_2$S$_2$O$_3$ and I$_2$ in the reaction: \[ 2\,\text{Na}_2\text{S}_2\text{O}_3 + I_2 \rightarrow 2\,\text{NaI} + \text{Na}_2\text{S}_4\text{O}_6 \] are respectively:

An ideal gas with density (3.0 g L^-1) has a pressure of (684 mm Hg) at (25^C). The rms speed (in m s^-1) of the gas is (1 atm = 10^5 Pa).

Which species has bond order 2.5 and is paramagnetic?

For a convex lens, magnifications m_1 and m_2 correspond to object distances u_1 and u_2. The focal length is:

In an electromagnetic wave in vacuum, the relation between peak electric field E_0 and magnetic field B_0 is:

Correct increasing order of first ionization enthalpy is: C, O, N, F

Volume of 4.4 g CO$_2$ at STP is:

Which quantum number combination is impossible for a hydrogenic atom orbital?

The threshold frequency for a certain photosensitive metal surface is _0. When light of frequency 2_0 is incident on the surface, the maximum velocity of the emitted photoelectrons is v_1. If the frequency is increased to 5_0, the maximum velocity becomes v_2. The ratio v_1 : v_2 is:

A wire of resistance R is stretched uniformly to double its original length. The new resistance will be:

In a nuclear reactor, heavy water (D_2O) is used as a moderator. Its main function is to:

Three capacitors of capacitances \(2\,\mu F\), \(3\,\mu F\), and \(6\,\mu F\) are connected in series. The equivalent capacitance is:

The electric potential at a point on the axis of an electric dipole at a distance r from its center is proportional to:

Doping a semiconductor with a trivalent impurity results in:

A planet revolves around the Sun in an elliptical orbit. The areal velocity of the planet is \(4 \times 10^{16}\,\text{m}^2\text{s}^{-1}\). If the maximum distance between the planet and the Sun is \(4 \times 10^{12}\,\text{m}\), then the minimum speed of the planet is:

Two sound waves having wavelengths 5.0 m and 5.5 m respectively produce 10 beats per second when propagating in a gas. The velocity of sound in the gas is:

The displacement of a progressive wave is given by \( y = 0.5 \sin(100t - 2x) \), where x and y are in meters and t is in seconds. The velocity of the wave is:

The structural characteristics of Simple Harmonic Motion (SHM) require that the acceleration of a particle is directly proportional to its displacement from the mean position and is directed:

The fundamental frequency of a closed organ pipe of length L is equal to the frequency of the first overtone of an open organ pipe of length L'. The relation between their lengths is:

If the absolute temperature of a black body is tripled, the total radiant energy emitted per second per unit area increases by a factor of:

The energy of a particle executing Simple Harmonic Motion (SHM) is given by E = Ax^2 + BV^2. Here 'x' is the displacement of the particle from its mean position, 'V' is its velocity at 'x', and A and B are positive constants. The maximum velocity of the particle is:

The mean free path of a gas molecule of diameter d and number density n (number of molecules per unit volume) is inversely proportional to:

A string of mass 2.5 kg is under a tension of 200 N. The length of the stretched string is 20 m. If a transverse jerk is struck at one end of the string, the time taken for the disturbance to reach the other end is: