CELSA Knowledge 1

Question 1

What is the color of blood when it's inside your body?

Accepted Answer

Red

Answer

Blood inside the human body, particularly when oxygenated, is a vibrant red color. Although it may appear darker or bluish through the skin due to light absorption and scattering, its actual color is always red due to the hemoglobin in red blood cells. Deoxygenated blood is a darker shade of red, not blue.

Question 2

Which is the fastest bird in the world?

Accepted Answer

Peregrine Falcon

Answer

The Peregrine Falcon is widely recognized as the fastest bird in the world, and indeed the fastest animal on the planet. It achieves incredible speeds during its hunting dive, known as a stoop, where it can exceed 200 miles per hour (320 km/h). This makes it significantly faster than other birds like the Bald Eagle or Hummingbird.

Question 3

What is the tallest waterfall in the world?

Accepted Answer

Angel Falls, Venezuela

Answer

Angel Falls, located in Venezuela, holds the record as the world's tallest uninterrupted waterfall. Its waters plunge an astounding 979 meters (3,212 feet) from the summit of Auyán-tepui. This makes it significantly taller than other famous waterfalls like Niagara Falls or Sutherland Falls.

Question 4

Which planet is known as the "Red Planet"?

Accepted Answer

Mars

Answer

Mars is famously known as the 'Red Planet' due to the abundance of iron oxide (rust) on its surface, which gives it a distinctive reddish-orange hue. This characteristic color is easily observable from Earth and has been a defining feature of the planet throughout history.

Question 5

Which element is known as the building block of life?

Accepted Answer

Carbon

Answer

Carbon is often referred to as the building block of life because all known life forms on Earth are carbon-based. Its unique atomic structure allows it to form stable bonds with many other elements, creating the complex organic molecules essential for life, such as proteins, nucleic acids, carbohydrates, and lipids.

(CELSA) Combined English Language Skills Assessment Practice Test

(CELSA) Combined English Language Skills Assessment Practice Test

CELSA Knowledge 1