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ENTRANCE TEST – 2008 Multiple Questions and Answers.
| 21. | In LED when an electron combines with a __________ during forward bias conduction, a photon of visible light is emitted. | ||
| A. | High Voltage. | ||
| B. | Photon. | ||
| C. | Hole. | ||
| D. | Positron. | ||
| 23. | The neutron is assumed to be made of | ||
| A. | One up quark and two down quarks. | ||
| B. | Two up quarks and two down quarks. | ||
| C. | Two up quarks and one down quark. | ||
| D. | One up quark and one down quark. | ||
| 24. | An __________ missile is called a ballistic missile. | ||
| A. | Un-powered and guided. | ||
| B. | Un-guided and powered. | ||
| C. | Powered and guided. | ||
| D. | Un-powered and un-guided. | ||
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