KVPY Government Jobs Exams

A student sees the top edge and the bottom center C of a pool simultaneously from an angle i¸ above the horizontal as shown in the figure. The refraction index of water which fills up to the top edge of the pool is 4/3. If h/x = 7/4 then cos i¸ is

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KVPY Other Question

In a thermally isolated system, two boxes filled with an ideal gas are connected by a valve. When the valve is in closed position, states of the box 1 and 2, respectively, are (1 atm, V, T) and (0.5 atm, 4V, T). When the valve is opened, the final pressure of the system is approximately
option
(A) 0.5 atm
(B) 0.6 atm
(C) 0.75 atm
(D) 1.0 atm An aqueous buffer is prepared by adding 100 ml of 0.1 mol l-1 acetic acid to 50 ml of 0.2 mol l-1 of sodium acetate. If pKa of acetic acid is 4.76, the pH of the buffer is
option
(A) 4.26
(B) 5.76
(C) 3.76
(D) 4.76