| 1 |
The number of hovering satellites which can send transmissions to all over the world: |
one
Two
Three
Four
|
| 2 |
Hovering satellite completes its rotation in 24 hours at the height of: |
360 km
3600 km
36000 km
360000 km
|
| 3 |
How many electrons Guns are used in colour T.V? |
One
Two
Three
Four
|
| 4 |
The frequency of the carrier waver used of radio transmission: |
30 KHZ
40 KHZ
50 KHZ
60 KHZ
|
| 5 |
The speed of radio wave is: |
Light
Air
Sound
Rocket
|
| 6 |
Which of the following are electromagnetic waves: |
sound
water waves
Ultrasound
light
|
| 7 |
Which of the following is used as rectifier; |
semi - conductor diode
resistors
capacitors
Germanium
|
| 8 |
Which element is used to make LED? |
Aluminum
Calcium
sodium
Arsenic
|
| 9 |
The elements used to increase the number of free electrons in the semi - conductor belong to: |
2<sup>nd</sup> group
3<sup>rd</sup> group
4<sup>th</sup> group
5<sup>th</sup> group
|
| 10 |
The examples of semi - conductors: |
sodium and potassium
calcium and potassium
Germanium and silicon
carbon and nitrogen
|
| 11 |
The substances through which current con not pass are called: |
Semi - conductors
Insulators
conductors
non - metal
|
| 12 |
The substances through which current can pass easily are called: |
conductors
insulators
Semi - conductors
Non - Electrolytes
|
| 13 |
A device which does not allow current to pass through it overt a certain limit: |
Switch
circuit breaker
Resistor
Fuse
|
| 14 |
Multi - meter is an instrument which can be used to measure: |
Resistance
Current
Potential difference
all of the above
|
| 15 |
Which circuits carry currents to the lights heaters and other appliances: |
parallel circuits
series circuits
common circuits
All of the above
|
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