MCQ_SINGLE

Natural selection can lead to (a) stabilisation (b) genetic drift (c) directional change (d) disruption Choose the correct answer from the options given below :

MCQ_SINGLE

A car travels on a circular racetrack of radius 50 m, which is banked at an angle $\theta$. If the car travels at a speed $10~ms^{-1}$, then the wear and tear on its tyres is minimum. Taking the acceleration due to gravity to be $10~ms^{-2}$, the value of $\theta$ is:

MCQ_SINGLE

Given below are two statements: Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes. Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes. In the light of the above statements, choose the correct answer from the options given below:

MCQ_SINGLE

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:

MCQ_SINGLE

For a salt XY, which is a strong electrolyte, the plot of $\Lambda_{m}$ versus $\sqrt{c}$ has a slope of $-90.0~S~cm^{2}mol^{-3/2}L^{1/2}$ at 298 K. At 0.01 M concentration of XY, the value of $\Lambda_{m}$ is $145.0~S~cm^{2}mol^{-1}$. The limiting molar conductivity of $Y^{-}$ ion $(\lambda_{Y^{-}}^{0}$, in $S~cm^{2}~mol^{-1}$) at 298 K will be (Given : $\lambda_{X^{+}}^{0}=74.0~S~cm^{2}mol^{-1})$

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