Explanation

 I was reading a novel when they came to see me.

This is a case of a past continuous action interrupted by a simple past action:

"I was reading a novel" → Past continuous (ongoing action)

"They came to see me" → Simple past (interrupting event)

This is a common structure in English: Past Continuous + when + Simple Past

Explanation

Nitrobenzene reacts slower than benzene in electrophilic substitution due to the electron-withdrawing nitro group.

The NO₂ group deactivates the benzene ring, making it less reactive toward electrophiles.

Explanation

Aluminum (Al) reacts with oxygen to form a thin protective oxide layer (Al₂O₃) that prevents further oxidation.

This is why it doesn’t react aggressively with oxygen after this initial reaction.

Explanation

The candela (cd) is the SI unit for luminous intensity, which measures the perceived brightness of a light source. 

Mole (a): This is the SI unit for the amount of substance. 

Kelvin (b): This is the SI unit for temperature. 

Ampere (d): This is the SI unit for electric current. 

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

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.