| 1 |
The frequency of the carrier waver used of radio transmission: |
- A. 30 KHZ
- B. 40 KHZ
- C. 50 KHZ
- D. 60 KHZ
|
| 2 |
The examples of semi - conductors: |
- A. sodium and potassium
- B. calcium and potassium
- C. Germanium and silicon
- D. carbon and nitrogen
|
| 3 |
The major function of electronic devices is to amplify the ........ signals. |
- A. Stronge electric
- B. Semi strong electric
- C. Both a and c
- D. weak electric
|
| 4 |
English word "9" has been divided into ............ segments. |
|
| 5 |
The number of hovering satellites which can send transmissions to all over the world: |
- A. one
- B. Two
- C. Three
- D. Four
|
| 6 |
In P-type semi -conductior, most of the current is due to. |
- A. Free electron
- B. Holes
- C. Positive ions
- D. Heat
|
| 7 |
The elements used to increase the number of free electrons in the semi - conductor belong to: |
- A. 2<sup>nd</sup> group
- B. 3<sup>rd</sup> group
- C. 4<sup>th</sup> group
- D. 5<sup>th</sup> group
|
| 8 |
Who was the inventor of radio system. |
- A. Grahm bell
- B. F. Crick
- C. Charles babbage
- D. Marconi
|
| 9 |
Which of the following is used as rectifier; |
- A. semi - conductor diode
- B. resistors
- C. capacitors
- D. Germanium
|
| 10 |
Which element is used to make LED? |
- A. Aluminum
- B. Calcium
- C. sodium
- D. Arsenic
|
