51. If a magnetic needle is freely suspended at teh geographic North Pole ______? 52. South Pole is located in the continent of ______? 53. The atmospheric pressure at any place is measured by ______? 54. Which mountain system lies between the Black Sea adn the Caspian Sea ______? 55. Which of these cities once served as the capital of Japan ______? 56. Which peninsula lies between the Black Sea and the Sea of Azov ______? 57. On the bank of which river is the city of London located ______? 58. Which among the following trees is considered the tallest in the world ______? 59. Which country was earlier known as Siam ______? 60. Which is the largest country in the Arabian Peninsula ______?