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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 ?

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 ,

A 2.5 cm cube of gelatin placed on a table, is subjected to a shearing fornce a o 0.5gk . The upper surface of the of the cube is displaced by 0.5cm. Calculate the shear modulus of gelatin.

Shows a hydraulic press with the larger piston of diameter 35cm at a height of 1.5 m relative to the smaller piston of diameter 10cm. The mass on the smaller piston is 20gk. What is the force exerted on the load by the lerger piston ? The density of oil in the press is 750 "kgm"^(-3).

The specific heat of a substance varies with temperature according to c =0.2 +0.16 T + 0.024 T^(2) with T in "^(@)c and c is cal//gk . Find the energy (in cal) required to raise the temp of 2g substance from 0^(@)to 5^(@)C

In the following figure, seg DH bot seg EF and seg GK bot EF. If DH = 6 cm, GK = 10 cm and A(DeltaDEF) = 150 cm^2 , then find: (i) EF (ii) A (DeltaGEF) (iii) A(squareDFGE)