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What will come in place of the question mark(?) in the following series of English alphabet? AE CG EI GK ?

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 fort is at the top of a hill of height h above the sea-level.Prove that the greatest horizontal distance from which a gun in the ship can hit the fort is 2sqrt(k(k-h)) where sqrt(2gk) is the muzzle velocity.

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).

2gk block is kept on 1kg block as shown . The friction between 1kg block and fixed surface is absent and the coefficient of friction between 2kg block is mu=0.1 . A constant horizontal force F=4N is applied on 1kg block. If the work done by the friction on 1 kg block in 2s is -X J , then find X . Take g=10m//s^(2) .

In the following figure, seg DH bot seg EF and seg GK bot seg EF. If DH = 6 cm, GK = 10 cm and A(Delta DEF) = 150 cm^(2) , then find : i. EF ii. A(Delta GEF) iii. A( square DFGE).

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)