Explanation

When oxygen tension is 115 mm of mercury, hemoglobin saturation is 100%. 

At high oxygen tensions (like 100 mm Hg and above), essentially all available hemoglobin binding sites are occupied by oxygen molecules, resulting in complete saturation. 

Explanation

• An optical instrument used to measure the properties of visible light is called a Spectroscope.
• It analyzes the composition and properties of materials based on the light they emit or absorb.
• It helping us understand the physical and chemical properties of objects in the universe.

Explanation

 When iodine dissolves in water in the presence of KI, it forms the I₃⁻ ion.

Explanation

Projectile motion involves:

• Horizontal motion (x-axis)

• Vertical motion (y-axis)

These two motions occur simultaneously but are independent of each other.

Therefore, projectile motion is considered two-dimensional.

Explanation

To convert radians to degrees, you multiply the number of radians by 180/π. 100 radians multiplied by 180/π is approximately 5729.58 degrees, which rounds to 5730 degrees. 

Explanation

I have been helping him for many years.

میں کئی سالوں سے اس کی مدد کر رہا ہوں۔

The sentence uses "for many years", which indicates an action that started in the past and is still continuing.

For such cases, we use the present perfect continuous tense:

$Subject+have/hasbeen+verb-ing$

Explanation

Transfusion of blood is: The process of transferring blood from one person to another.

Explanation

James Chadwick is known for his discovery of the neutron in 1932. 

Proton: Protons were discovered by Ernest Rutherford, before neutrons.

Electron: Electrons were discovered by J.J. Thomson, much earlier than protons or neutrons.

Positron: A positron is the antiparticle of an electron, and it was discovered by Carl Anderson in 1932. 

Explanation

Robert Brown discovered Nucleus in: 1831

Explanation

“Fiddles” likely means wasting time, fidgeting, or avoiding doing the task seriously.

Rejects رد کرتا ہے۔ – Closest in meaning (implies resistance, unwillingness, or avoidance)