Explanation

Calculate each group:

• Birds: $9\times 2=18$

• Cows: $2 times 4 = 8$
  

• Dogs: $3 times 4 = 12$
  

Total $=18+8+12=38$ legs.

Explanation

The series 11, 22, 33, 44 adds 11 each step:

• 11 + 11 = 22

• 22 + 11 = 33

• 33 + 11 = 44

• 44 + 11 = 55

Explanation

Tehran, Karachi, and Lahore are cities,

While Table is an object.

Explanation

The sequence increases by +2 each time:

1 → 3 → 5 → 7 → 9 → 11

Explanation

There are 20 legs in total (16 from the cats and dogs, 4 from the pigeons). 

Each cat has 4 legs, so 2 cats have 2 * 4 = 8 legs.

Each dog has 4 legs, so 2 dogs have 2 * 4 = 8 legs.

Each pigeon has 2 legs, so 2 pigeons have 2 * 2 = 4 legs.

Total legs: 8 (cats) + 8 (dogs) + 4 (pigeons) = 20 legs. 

Explanation

 Elephant – Because lion, tiger, and leopard are all big cats (carnivores from the Felidae family), while the elephant is not.

Explanation

 Orbital velocity (vo) is the velocity needed for a satellite to stay in a circular orbit around the Earth.

- Escape velocity (ve) is the minimum velocity needed to escape Earth’s gravitational pull without further propulsion.

Formulas:

- Orbital velocity, vo = √(GM / R)  

- Escape velocity, ve = √(2GM / R)  

Where:  

G = gravitational constant,  

M = mass of Earth,  

R = radius of Earth.

Now, the ratio ve / vo = √(2GM / R) ÷ √(GM / R) = √2

So,  

Escape velocity is √2 times the orbital velocity.

Explanation

A bat is used with a ball.

Just as a pen is used with paper.

Explanation

The range of a projectile is the same for two complementary launch angles (i.e., they add up to 90°).

For example, a projectile launched at 30° and 60° will have the same range.

Explanation

Cloud formation is primarily due to the phenomenon of condensation. 

When water vapor in the air cools down, it reaches a saturation point and condenses into tiny water droplets or ice crystals, forming clouds.

This process is called condensation.