The largest tiger reserve in India is

The variance of $20$ observations is $5$. If each observation is multiplied by $2$,then the variance of the resulting observations is:

The product obtained at the anode when $50 \%$ $H_2SO_4$ aqueous solution is electrolysed using platinum electrodes is:

Two fair dice are rolled. The probability of the sum of digits on their faces being greater than or equal to $10$ is

An object of mass $2m$ is projected with a speed of $100 \ m/s$ at an angle $\theta = \sin^{-1}(3/5)$ to the horizontal. At the highest point,the object breaks into two pieces of same mass $m$ and the first one comes to rest. The distance between the point of projection and the point of landing of the bigger piece (in metre) is (Given,$g = 10 \ m/s^2$)

Total internal reflection of light is possible when light enters from