Explanation

Gravitational force is the natural force of attraction between any two masses in the universe.

This force is always attractive.

It acts along the line joining the centers of the two masses.

Explanation

The Session layer is the 5th layer of the OSI (Open Systems Interconnection) model.

It is responsible for establishing, managing, and terminating sessions between two communicating devices.

The OSI (Open Systems Interconnection) model has 7 layers, which are:

1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application

Explanation

Explanation

"Speke" is a spelling error; the correct spelling is "speak".

Correct sentence: Although Saleem has lived in Lahore, he can't speak Punjabi well.

Explanation

In a solution, the solute is the substance that dissolves, and the solvent is the one that does the dissolving.

In lemonade, lemon juice is the solute, and water is the solvent.

Explanation

Mixing vinegar (acetic acid) with baking soda (sodium bicarbonate) produces carbon dioxide gas, water, and sodium acetate.

This is a chemical reaction with visible fizzing, showing a new substance is formed.

Explanation

The product of two integers of the same sign is always Positive.

Same sign (both positive or both negative) multiplication gives positive result.

Opposite signs give negative product.

Explanation

The object is the noun that receives the action of the verb.

In this sentence, "football" is what he is playing, so it's the object.

Explanation

The US dollar (USD) is the most used currency in the world.

It dominates global trade and finance.

It is the world's reserve currency.

While the Euro is used by the most countries.

The USD has a larger volume of trading.

It is more often used in international transactions. 

Explanation

"Patiently" (meaning "with patience") is the correct spelling.

"Patiabtily" is a misspelling and does not exist in English.