Physics UPSC PYQ 2015

82 questions from the UPSC 2015 examination. Showing a preview of 3 below — generate a full practice test to solve the rest.

3 questions

1Medium5 marks

Establish that : hc = 1240 eV.nm = 1240 MeV. fm

2Medium10 marks

A Van der Waals gas undergoes Joule-Kelvin expansion with a pressure drop of 50 atm. If its initial temperature is 300 K, determine its final temperature. (Given Van der Waals constant a = 0.136 Pa m^6 mol^-1, b = 36.5 * 10^-6 m^3 mol^-1, C_p = 30 J K^-1 mol^-1, R = 8.3 J K^-1 mol^-1)

3Medium10 marks

A series RLC circuit has a resistance of 100 ohms and an impedance of 210 ohms. If this circuit is connected to an a.c. source with an r.m.s. voltage of 220 V, how much is the average power dissipated in the circuit ?

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