List of practice Questions

500 mL of 0.1M HCl is mixed with 500 mL of 0.02M HA (weak acid) solution. To this solution, 2 g of solid NaOH is added. What is the pH of the resultant solution? (Given} \( K_a \) of HA is \( 4 \times 10^{-10} \), molar mass of NaOH is 40 g/mol, log 2 = 0.3, log 4 = 0.6\bf{)

Among the following, which is the correct statement?

The alloy formed by lithium with metal 'X' is used to make armour plates. 'X' is

The element with atomic number 118 will be:

The number of antibonding electrons in \( N_2^+ \), \( O_2^+ \), \( O_2^- \) is respectively:

The total number of electrons in antibonding molecular orbitals of \( O_2 \) is:

Identify the correct statements from the following:
(I) According to Charles' law, at constant pressure, the volume of a gas is directly proportional to its temperature.
(II) The rate of diffusion of a certain mass of a gas is inversely proportional to its density, at constant pressure and temperature.
(III) The kinetic energy of a gas is directly proportional to T (K).

At 300 K, 1 g of an ideal gas (A) exerted a pressure of 2 atm in a closed container. When 2 g of another ideal gas (B) was introduced into this container at the same temperature, the pressure changed to 3 atm. The correct relationship between the molar mass of A (\(M_A\)) and B (\(M_B\)) is:

Among the following, the possible nuclear reaction is:

In a transistor amplifier used in CE configuration, the phase difference between input voltage and output voltage is:

n-type semiconductor is formed when germanium is doped with:

The intensity of ground waves decreases with the increase of distance travelled is due to:

Which of the following contains 10 electrons, 11 protons, and 12 neutrons?

The wave number of a photon is \( 10^4 \, cm^{-1} \). What is its energy in joules? Given: \[ h = 6.6 \times 10^{-34} \, Js, \quad c = 3 \times 10^{10} \, cm/s, \quad \tilde{\nu} = 10^4 \, cm^{-1} \]

The radius of the path of a charged particle of mass \( m \) and charge \( q \) moving with a speed \( v \) in a magnetic field \( B \) is given by:

If the radius of the Earth is \( 6.4 \times 10^6 \, m \) and its magnetic dipole moment is \( 1.3 \times 10^{23} \, Am^2 \), then the magnetic field at the equator is:

A changing current in a coil can induce an emf in a nearby coil. This process is:

The resistance \( R \), the inductive reactance \( X_L \), and the capacitive reactance \( X_C \) of a series LCR circuit connected to an ac source are related by \( R = 0.6 X_L = 3 X_C \). The impedance of the circuit is:

The variation of charge \( q \) with time \( t \) on a parallel plate capacitor is given by \( q = q_0 \cos(\omega t) \). The displacement current through the capacitor is:

The de Broglie wavelength of an electron in the first orbit of hydrogen atom is:

The speed of an electron in an orbit of hydrogen atom is \( \frac{1}{274} \) times the speed of light in vacuum. The kinetic energy of the electron in the orbit is:

The resultant amplitude of superposition of two waves \( y_1 = a \cos(\omega t) \) and \( y_2 = a \cos(\omega t + \phi) \) is:

The magnitude of electric field intensity \( E \) is such that, an electron placed in it would experience an electrical force equal to its weight. Then the value of \( E \) is: