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Which of the following is not permissible arrangement of electrons in an atom?
At constant temperature, on increasing the pressure of a gas by 5%, its volume will decrease by:
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Atomic no. 65) are:
Select the correct statement.
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?
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:
A $0.66 \text{ kg}$ ball is moving with a speed of $100 \text{ m/s}$. The associated wavelength will be: ($h = 6.6 \times 10^{-34} \text{ Js}$)
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
The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is:
A particular station of All India Radio, New Delhi, broadcasts on a frequency of $1,368 \text{ kHz}$ (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is: [speed of light, $c = 3.0 \times 10^8 \text{ m s}^{-1}$]
Incorrect set of quantum numbers from the following is:
Two sound waves with wavelengths $5.0 \text{ m}$ and $5.5 \text{ m}$, respectively, propagate in a gas with a velocity of $330 \text{ m/s}$. How many beats per second can we expect?
Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains helium (monoatomic), the second contains fluorine (diatomic) and the third contains sulfur hexafluoride (polyatomic). The correct statement, among the following, is:
If the rate of the reaction is equal to the rate constant, the order of the reaction is:
At any instant of time $t$, the displacement of any particle is given by $2t-1$ (SI unit) under the influence of the force of $5\text{ N}$. The value of instantaneous power (in SI units) is:
The temperature at which the RMS speed of atoms in neon gas is equal to the RMS speed of hydrogen molecules at $15^\circ\text{C}$ is: (the atomic mass of neon $= 20.2 \text{ u}$, molecular mass of hydrogen $= 2 \text{ u}$)
The potential energy of a long spring when stretched by $2\text{ cm}$ is $U$. If the spring is stretched by $8\text{ cm}$, the potential energy stored in it will be: