physics general questions 2

Optic fibers are mainly used for which of the following?

A. Communication
B. Weaving
C. Musical instruments
D. Food industry

32. Who invented Bakelite?

A. Charles Goodyear
B. Leo Hendrik Baekeland
C. Roy Plunkett
D. Henry Ford

33. Rocket engine works on the principle of

A. Newtons third law
B. Newtons first law
C. Newtons second law
D. None of these.

34. Cryogenic engines find application in

A. Rocket technology
B. Frost free refrigerators
C. Sub-marine propulsion
D. researches in superconductivity

35. The best and the poorest conductors of heat are respectively

A. Silver(AG) and lead(PB)
B. Copper(CU) dialuminium (AL)
C. Silver(AG)and gold(AU)
D. Copper(CU)and gold(AU)

36. What is the main component of biogas and natural gas?

A. Ethane
B. Methane
C. Propane
D. Butane

37. Who of the following recognized that large quantity of energy is released as a result of the fusion of hydrogen nuclei to form deuterium?

A. Enrico Fermi
B. Glenn Seaborg
C. Hans Bethe
D. Werner Heisenberg

38. The phenomenon of total internal reflection is observed in which one of the following?

A. Glowing tube light
B. Light passing through lens
C. Sparkling diamond
D. Twinkling star.