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There are 200 questions in a 3 h examination. Among 200 questions, 50 are from Mathematics, 100 are from GK and 50 are from Science. Ram spent twice as much time on each Mathematics question as for each other question. How many minutes did he spend on Mathematics questions ?

The specific heat of a substance varies with temperature according to the function c = 0.20 + 0.14 T + 0.023T^(@) , with T in ""^(@)C and c in Cal//g.K , Find the energy required to raise the temperature of 1.0g of this substance from 5.0 ""^(@)C to 15""^(@)C .

A block (A) of mass 45kg is placed on another block (B) of mass 123 gk. Now block (B) is displaced by extenal agent by 50 cm horizontally towards right. During the same time block (A) just reaches to the left end of block (B), Initial and final positions are shown in figures . the work done on block (A) in ground frame is ,

Let a_1,a_2,a_3…………., a_n be positive numbers in G.P. For each n let A_n, G_n, H_n be respectively the arithmetic mean geometric mean and harmonic mean of a_1,a_2,……..,a_n On the basis of above information answer the following question: A_k,G_k,H_k are in (A) A.P. (B) G.P. (C) H.P. (D) none of these