Answer: D) cooperate on law enforcement. Explanation: When the European union formed nations began to cooperate on law enforcement. The European Union is set up with the aim of ending the frequent and bloody wars between neighbours, which culminated in the Second World War.   As of 1950, the European Coal and Steel Community begins to unite European countries economically and politically in order to secure lasting peace. The six founding countries are Belgium, France, Germany, Italy, Luxembourg and the Netherlands. The 1950s are dominated by a cold war between east and west.   The historical roots of the European Union lie in the Second World War. Europeans are determined to prevent such killing and destruction from ever happening again.

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Answer: A) Water Explanation: Here Grass is to Erosion and whereas Dam is to Water. Since Grass prevents Erosion similarly Dam prevents Water flow.   Hence, Grass : Erosion :: Dam : Water.

Answer: A) 26 Explanation: Gold coins = 18000 , Silver coins = 9600 , Bronze coins = 3600 Find a number which exactly divide all these numbers  That is HCF of 18000, 9600& 3600  All the value has 00 at end so the factor will also have 00. HCF for 180, 96 & 36.   Factors of   180 = 3 x 3 x 5 x 2 x 2 96 = 2 x 2 x 2 x 2 x 2 x 3  36 = 2 x 2 x 3 x 3  Common factors are 2x2×3=12  Therefore, Actual HCF is 1200      Gold Coins 18000/1200 will be in 15 rooms Silver Coins 9600/1200 will be in 8 rooms Bronze Coins 3600/1200 will be in 3 rooms Total rooms will be (15+8+3)  =  26 rooms.