Physics
DIRECTIONS : Questions based on Physics.
21. | Optic fibres are mainly used for which of the following ? | ||
---|---|---|---|
A. Communication | |||
B. Weaving | |||
C. Musical instruments | |||
D. Food industry |
22. | Who invented Bakelite? | ||
---|---|---|---|
A. Charles Goodyear | |||
B. Leo Hendrik Baekeland | |||
C. Roy Plunkett | |||
D. Henry Ford |
23. | Rocket engine works on the principle of | ||
---|---|---|---|
A. Newtons third law | |||
B. Newtons first law | |||
C. Newtons second law | |||
D. None of these. |
24. | Cyrogenic engines find application in | ||
---|---|---|---|
A. Rocket technology | |||
B. Frost free refrigerators | |||
C. Sub-marine propulsion | |||
D. researches in superconductivity |
25. | The best and the poorest conductors of heat are respectively | ||
---|---|---|---|
A. Silver(AG) and lead(PB) | |||
B. Copper(CU)andaluminium(AL) | |||
C. Silver(AG)andgold(AU) | |||
D. Copper(CU)andgold(AU) |