Question Bank Directory

Which of the following is not permissible arrangement of electrons in an atom?

Maximum number of electrons in a subshell with l = 3 and n = 4 is:

At constant temperature, on increasing the pressure of a gas by 5%, its volume will decrease by:

If the mass of the sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following statements would not be correct?

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are:

The measurement of the electron position is associated with an uncertainty in momentum which is equal to $1 \times 10^{-18} \text{ g cm s}^{-1}$. The uncertainty in velocity of the electron will be: (mass of an electron is $9 \times 10^{-28} \text{ g}$)

Select the correct statement.

Which of the following statements is not correct?

Which of the following statements is incorrect?

At what temperature is the root mean square velocity of gaseous hydrogen molecules equal to that of oxygen molecules at 47°C?

The relation between $n_m$ ($n_m$ = number of permissible values of magnetic quantum number, $m_l$) for a given value of azimuthal quantum number ($l$) is:

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g=10 m/s²)

The molecules of a given mass of gas have RMS velocity of $200 \text{ ms}^{-1}$ at $27^\circ\text{C}$ and $1.0 \times 10^5 \text{ Nm}^{-2}$ pressure. When the temperature and the pressure of the gas are respectively, $127^\circ\text{C}$ and $0.05 \times 10^5 \text{ Nm}^{-2}$, the RMS velocity of its molecules in $\text{ms}^{-1}$ is:

The ratio of the specific heats $C_P/C_V = \gamma$ in terms of degrees of freedom ($n$) is given by:

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

Which one of the following ions has electronic configuration [Ar]3d⁶? (At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28)

A $0.66 \text{ kg}$ ball is moving with a speed of $100 \text{ m/s}$. The associated wavelength will be: ($h = 6.6 \times 10^{-34} \text{ Js}$)

The mean free path l for a gas molecule depends upon the diameter, d of the molecule as:

If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is

A block of mass $m$ is moving with initial velocity $u$ towards a stationary spring of stiffness constant $k$ attached to the wall as shown in the figure. Maximum compression of the spring is: (The friction between the block and the surface is negligible).