| 1 |
The current flow from p-type semi conductors is due to. |
- A. Free electrons
- B. Valance electrons
- C. Doping
- D. Hole
|
| 2 |
How many electrons Guns are used in colour T.V? |
- A. One
- B. Two
- C. Three
- D. Four
|
| 3 |
analogue signal is recorded on. |
- A. Magnetic tape
- B. Floppy disk
- C. Hard Disk
- D. C.D
|
| 4 |
Purose of electron gun in TV is to. |
- A. Fire electron
- B. Receive electron
- C. Consume electron
- D. Display picture
|
| 5 |
The number of hovering satellites which can send transmissions to all over the world: |
- A. one
- B. Two
- C. Three
- D. Four
|
| 6 |
Word FAX is short form of. |
- A. Facsiline
- B. Facsimile
- C. Fasimile
- D. None of these
|
| 7 |
Which element is used to make LED? |
- A. Aluminum
- B. Calcium
- C. sodium
- D. Arsenic
|
| 8 |
Who was the inventor of radio system. |
- A. Grahm bell
- B. F. Crick
- C. Charles babbage
- D. Marconi
|
| 9 |
The substances through which current con not pass are called: |
- A. Semi - conductors
- B. Insulators
- C. conductors
- D. non - metal
|
| 10 |
in binary system. 37 is written as. |
- A. 101101
- B. 100101
- C. 110011
- D. 101011
|
