Explanation

Although he had no external injuries, doctors found that he was suffering from internal bleeding.

اگرچہ اسے کوئی بیرونی زخم نہیں تھا لیکن ڈاکٹروں نے پایا کہ وہ اندرونی خون بہہ رہا ہے۔

External injuries are those that are visible on the outside of the body.

This contrasts with internal bleeding, which happens inside the body and isn't visible.

Explanation

 Did you hear the President's speech?

We use "Did" to form questions in the simple past tense.

"Hear" is the base form of the verb (after "did," we don't change the verb).

Explanation

The ratio of hydrogen to oxygen by mass in water is always 1:8. 

This ratio is derived from the atomic masses of hydrogen (approximately 1 g/mol) and oxygen (approximately 16 g/mol) in the water molecule (H₂O),

Where there are two hydrogen atoms and one oxygen atom.

Therefore, the mass ratio is (2 * 1) : 16, which simplifies to 2:16 or 1:8. 

Explanation

Ozone is typically a pale blue gas at room temperature and pressure,

Although it can appear colorless at very low concentrations

And becomes a dark blue liquid when condensed,

And a violet-black solid at extremely low temperatures. 

Explanation

The pH of acid rain is less than 5.6. 

Normal rain is slightly acidic due to the dissolution of carbon dioxide from the atmosphere.

It forms weak carbonic acid and typically has a pH of around 5.6

When the pH drops below this value, it is classified as acid rain.

Primarily caused by pollutants like sulfur dioxide and nitrogen oxides, according to the EPA. 

Explanation

The major component of the troposphere is nitrogen, which makes up about 78% of the air in this layer

The troposphere also contains a significant amount of oxygen (around 21%)

Smaller amounts of other gases like argon, water vapor, and carbon dioxide. 

Explanation

A foot-pound is a unit of work or energy

Specifically, it represents the amount of work done when a force of one pound moves an object one foot in the direction of the force. 

Physical Quantity/ Unit

Work/Energy: foot-pound (ft-lb)

Force: pound (lb)

Distance: foot (ft)

Explanation

The transistor is a semiconductor device with at least three terminals.

These terminals are typically referred to as the :

• Emitter
• Base
• Collector

They allow the transistor to control the flow of electrical signals and power. 

Explanation

 The key combination used to display the print dialog box in MS Excel is Ctrl + P.

shortcut key in  MS Excell:

Which key is used to help in MS Excel?

F1

***

Shift+Backspace

**

Which key is used to enter the current date in Excel?

 Ctrl+;

Explanation

 I found my car keys in my pocket.

مجھے اپنی کار کی چابیاں اپنی جیب میں مل گئیں۔

We use "in" for something inside an enclosed space — a pocket is an enclosed area.

 "In" is the correct preposition