Explanation

Pakistan Civil Aviation Authority (CAA) is a public sector

It was Formed on 7 December 1982

They work under the Federal Government of Pakistan 

PCAA's head office is situated at Jinnah International Airport in Karachi.

PCAA is a member state of the International Civil Aviation Organization

44 civilian airports in Pakistan are owned 

Explanation

Frequency and period are the inverse of each other

frequency is defined as one cycle per second

Hertz is a unit of frequency 

Explanation

To find the self-inductance of a coil, we can use the formula:

L = (ΔΦ / ΔI)

Where:

L is the self-inductance in Henry (H),

ΔΦ is the change in magnetic flux in Weber (Wb),

and ΔI is the change in current in Ampere (A).

In this case, the current changes from 5A to 0A (nil) in 5 seconds. (ΔI) is therefore 5A - 0A = 5A.

To find the change in (ΔΦ), we can use Faraday's law of electromagnetic induction

ΔΦ = L * ΔI

Since the current changes from 5A to 0A in 5 seconds, the rate of  (ΔI) is 5A / 5s = 1A/s.

Substituting the values into the equation:

ΔΦ = L * ΔI

500 V = L * 1 A/s

Since the (V) is equal to  (L) and  (ΔI), we can rewrite the equation as:

L = 500 V / 1 A/s

Simplifying the equation gives us:

L = 500 H

Therefore, the self-inductance of the coil is 500 Henry (H).

Explanation

To find the current flowing through the conductor, you can use Ohm's Law, which states:

$\text{Voltage (V)}=\text{Current (I)}\times \text{Resistance (R)}$

Given that the power (P) of the conductor is $100\text{W}$, and the voltage (V) is $250\text{V}$, you can use the formula:

$\text{Power (P)}=\text{Voltage (V)}\times \text{Current (I)}$

Solve for current (I):

$\text{Current (I)}=\frac{\text{Power (P)}}{\text{Voltage (V)}}$

Substitute the given values:

$\text{Current (I)}=\frac{100\text{W}}{250\text{V}}=0.4\text{A}$

So, the current flowing through the conductor is $0.4\text{A}$.

Explanation

 Convert the speeds of the trains from km/h to m/s

1 km/h = 1000 m/3600 s

Speed of the first train = 60 km/h = (60,000 m/3600 s) m/s = 16.67 m/s.

Speed of the second train = 45 km/h = (45,000 m/3600 s) m/s = 12.50 m/s.

Relative speed = Speed of the first train - Speed of the second train = 16.67 m/s - 12.50 m/s = 4.17 m/s.

Distance = Length of the second train = 500 meters.

Using the formula:

Distance = Speed × Time

Time = Distance / Relative speed = 500 meters / 4.17 m/s = 120.05 seconds.

To convert the time from seconds to minutes, we divide by 60:

Time in minutes = 120.05 seconds / 60 = 2 minutes (approximately).

Therefore, the first train will cross the second train after approximately 2 minutes.

Explanation

ICAO is a UN agency that deals with international air navigation

ICAO stands for International Civil Aviation Organization

It was created in 1944 by the Chicago Convention

It was started function (founded) on 14th July 1947

Its headquarters is in Montreal, Canada

Official language (06):

1. Arabic
2. Chinese
3. English
4. French
5. Russia
6. Spanish