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Three Carnot engines operate in series between a heat source at a temperature T_1 = 600 K and heat sink at temperature T_4 = 100K (see figure). There are two other reservoirs at temperature T_2 " and " T_3 as shown, with T_1 gt T_2 gt T_3 gt T_4 The three engines are equally efficient if:

In the adjoining figure, PM = 4.8, MR = 2.4, QN = 5.4, NR = 3.6. State with reason whether seg MN is Parallel to side PQ or not?

If 18 t h and 11 t h term of an A.P. are in the ratio 3\ :2 , then its 21 s t and 5t h terms are in the ratio 3\ :2 (b) 3\ :1 (c) 1\ :3 (d) 2\ :3

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o^(prime)c loc k , the true time is 59 7/(12) m indotp a s t 3 (b) 4 p.m. 58 7/(11)m indotp a s t 3 (d) 2 3/(11) m indotp a s t 4