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26. 

Which insurance salesman invented the fountain pen in 1884?
A. Lewis Edson Waterman
B. सर विलियम ग्रोव
C. चार्ल्स केटरिंग
D. जॉर्ज फाउंटेन
27. 

When was the first elevator built?
A. 1743
B. 1739
C. 1760
D. 1785
28. 

What Enrico Fermi invented?
A. X ray machine
B. बेताटरोन
C. साइक्लोट्रॉन
D. परमाणु रिऐक्टर
29. 

Which of the following was first patented by an Australian in 1889?
A. Electric Drill
B. विद्युत शेवर
C. बिजली की फेंस
D. इलेक्ट्रिक हीटर
30. 

Who among the following invented the small pox vaccine?
A. Robert Koch
B. एडवर्ड जेनर
C. रॉबर्ट हुक
D. लुई पाश्चर