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51. 

When were bar code scanners invented?
A. 1940s
B. 1950 के दशक
C. 1970 के दशक
D. 1960 के दशक
52. 

When was the game Frisbee invented?
A. 1920s
B. 1900
C. 1870 के दशक
D. 1890
53. 

Who invented Airship (rigid)?
A. Dr. Alan M. Turing
B. रोजर बेकन
C. जी फर्डिनेंड वॉन टसेपेल्लिन
D. ओटो
54. 

What piece of clothing was invented by French fashion designer Louis Reard in 1946?
A. Zoot suit
B. मिनी स्कर्ट
C. बिकिनी
D. छोटा टॉप
55. 

In which year was MIDI introduced?
A. 1987
B. 1983
C. 1973
D. 1977