Q. Optic fibers are mainly used for which of the following?
A. Communication
B. Weaving
C. Musical instruments
D. Food industry
Q. Who invented Bakelite?
A. Charles Goodyear
B. Leo Hendrik Baekeland
C. Roy Plunkett
D. Henry Ford
Q. Rocket engine works on the principle of
A. Newtons third law
B. Newtons first law
C. Newtons second law
D. None of these.
Q. Cryogenic engines find application in
A. Rocket technology
B. Frost free refrigerators
C. Sub-marine propulsion
D. researches in superconductivity
Q. 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)
Q. What is the main component of biogas and natural gas?
A. Ethane
B. Methane
C. Propane
D. Butane
Q. 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
Q. 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.
Q. Through which one among the following materials does sound travel slowest?
A. Air
B. Glass
C. Water
D. Wood
Q. Which one of the following is printed on a commonly used fluorescent tube light?
A. 220 K
B. 273 K
C. 6500 K
D. 9000 K
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