MCQ_SINGLE

The mean free path of molecules in an ideal gas A is half that of another ideal gas B. The diameter of the spherical molecules of gas A is twice the diameter of the molecules of B. If number densities of the gases A and B are $n_{A}$ and $n_{B}$ respectively, the correct option is:

MCQ_SINGLE

An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, $\epsilon_{r}=9$, has the electric field, $E_{x}=E_{0} \sin(kz-2\pi\times10^{6}t)Vm^{-1}$ where $E_{0}$ is the amplitude and k is the wave vector. Among the following options, the incorrect choice is

MCQ_SINGLE

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. $W_{1}$, $W_{2}$, $W_{3}$ and $W_{4}$ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; $\Delta U_{2}$ and $\Delta U_{4}$ are changes in the internal energy for the processes 2 and 4, respectively. [use $R=2~cal~K^{-1}~mol^{-1}$] The correct option is

MCQ_SINGLE

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf. Reason R: Stem height is a contrasting trait, with tall being dominant and dwarf being recessive. In the light of the above statements, choose the most appropriate answer from the options given below :

MCQ_SINGLE

In a solar system, the time-period of revolution of a planet tracing a circular orbit of radius R is proportional to:

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