MCQ
major product
  • A


  • C

  • D

Answer

Correct option: B.

b

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

When an electron in hydrogen atom is excited, from its $4^{th}$ to $5^{th}$ stationary orbit, the change in angular momentum of electron is (Planck’s constant: $h = 6.6 \times {10^{ - 34}}J{\rm{ - s}}$)
The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature $27^oC$ and $127^oC$ respectively is
The magnitudes of the gravitational force at distances ${r_1}$ and ${r_2}$ from the centre of a uniform sphere of radius $R$ and mass $M$ are ${F_1}$ and ${F_2}$ respectively. Then
$1$ wire mesh consisting of very small squares is viewed at a distance of $S\,cm$ through a magnifying converging lens of focal length $10\,cm$, kept close to the eye. The magnification produced by the lens is
$100\  g$ of water is heated from $30^o\ C$ to $50^o\ C$ Ignoring the slight expansion of the water, the change in its internal energy is ...... $kJ$ (specific heat of water is $4184\  J/kg/K$)
The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. $5$ arises from the transition from level $ B$ to $A$). The following spectral lines will also occur in the absorption spectrum
If the distance between the plates of parallel plate capacitor is halved and the dielectric constant of dielectric is doubled, then its capacity will
A heated body maintained at $T\,K$ emits thermal radiation of total energy $E$ with a maximum intensity at frequency $v$ . The emissivity of the material is $0.5$ . If the temperature of the body be increased and maintained at temperature $3T\,K$ , then

$(i)$ The maximum intensity of the emitted radiation will occur at frequency $v /3$

$(ii)$ The maximum intensity of the emitted radiation will occur at frequency $3v $

$(iii)$ The total energy of emitted radiation will become $81\,E$

$(iv)$ The total energy of emitted radiation will become $27\,E$

A particle of charge $q$ and mass $m$ enters a region of a transverse electric field of $E_{0} \hat{ j }$ with initial velocity $v_{0} \hat{ i }$. The time taken for the change in the de-Broglie wavelength of the charge from the initial value of $\lambda_{0}$ to $\lambda_{0} / 3$ is proportional to
Two bodies having volumes $V$ and $2V $ are suspended from the two arms of a common balance and they are found to balance each other. If larger body is immersed in oil (density $d_1 $ $=$ $ 0.9$ $ gm/cm^3$) and the smaller body is immersed in an unknown liquid, then the balance remain in equilibrium. The density of unknown liquid is given by ......... $gm/cm^3$