61. Which of the following was not a key achievement of the Gupta period in the field of science and technology?
a) Development of the decimal system
b) Invention of the zero
c) Advances in metallurgy
d) Invention of the compass
62. Which of the following was not a key social development during the Gupta period?
a) Growth of the caste system
b) Increase in the status of women
c) Emergence of the joint family system
d) Development of the guru-shishya tradition
63. Which of the following was not a key feature of the Gupta economy?
a) Use of coins made of gold, silver, and copper
b) Development of the Silk Road trade network
c) Creation of a national banking system
d) Introduction of the barter system
64. Who was the famous astronomer who lived during the Gupta period and wrote the Aryabhatiya?
a) Aryabhata
b) Brahmagupta
c) Varahamihira
d) Bhaskara II
65. Which of the following was not a key foreign policy of the Gupta Empire?
a) Establishment of diplomatic relations with China
b) Formation of alliances with neighboring kingdoms
c) Conquest of Southeast Asia
d) Non-interference in the affairs of neighboring kingdoms