PAF AIRMAN PAST PAPER 2021 TO DATE
PAF 5 years
Past Papers Click
here
Show Answers
چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
سیمی کنڈکٹر کے درمیان فرق
Half filled
Very wide
Partially filled
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A semiconductor with a large value is called a wide-band-gap semiconductor
Light emitting diode is a 2-lead semiconductor device.
The name semiconductor comes from the fact that these materials have electrical conductivity between a metal, like copper, gold, etc., and an insulator, like glass.
They have an energy gap of less than 4eV (about 1eV).
پی این ڈایڈڈ میں ممکنہ رکاوٹ کی وجہ ______ ہے؟
Depletion of positive charges near the junction
Concentration of positive and negative charges near the junction
Depletion of positive and negative charges near the junction
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The potential barrier in a PN diode is caused by the depletion region, where mobile positive and negative charges near the junction diffuse and leave behind immobile ions. This depletion creates an electric field that opposes further charge movement, forming the potential barrier.
Majority carriers
Minority carriers
Thermal carriers
Hole carriers
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The (reverse) saturation current of a p-n junction diode is the current caused by the diffusion of minority carriers
From the n-type/p-type regions (quasi-neutral regions) to the depletion region
مکمل لہر کی اصلاح کے لیے کم از کم کتنے ڈائیوڈز کی ضرورت ہے؟
1
2
3
4
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
The minimum number of diodes required for full-wave rectification using a bridge rectifier is four .
سیمیکمڈکٹر ڈایڈڈ میں ٹرمینلز کی تعداد ______ ہیں؟
5
3
2
None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A semiconductor diode has 2 terminals: anode (positive) and cathode (negative).
It allows current to flow in one direction only , functioning as a rectifier .
ایک جسم توازن میں ہے جب اس میں ______ ہے؟
Uniform speed
Uniform acceleration
Both a and b
Zero acceleration
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
A body is in equilibrium when the net force acting on it is zero, and it is not changing its motion.
This means that the body is either at rest or moving with a constant velocity (uniform speed), but not accelerating.
1 km
2 km
3 km
4 km
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Given:
10 men cover 10 km in 3 days.
Step 1: Work done per man
→ 10 men = 10 km in 3 days
→ 1 man = 1 km in 3 days (divide both sides by 10)
Step 2: For 3 men
→ 1 man = 1 km in 3 days
→ 3 men = 3 × 1 = 3 km in 3 days
کون سا باقیوں سے مختلف ہے؟ یارڈ، فٹ، کلومیٹر، لمبائی
Yard
Foot
Kilometer
Length
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Yard, Foot, and Kilometer are all units of measurement for distance or length.
Length is not a unit; it's a general term that describes the dimension being measured.
ND18-9-2023
Your parents must obeyed by you
Your parents must been obeyed by you
Your parents must be obeyed by you
Your parents must being obeyed by you
All are wrong
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Active Voice: You must obey your parents.
Passive Voice: Your parents must be obeyed by you.
Use be in passive voice.
Use third form of a verb in passive voice
Temporary
Constant
Optional
Irregular
اس سوال کو وضاحت کے ساتھ پڑھیں
Explanation
Invariable ناقابل تغیر
Constant مستقل