Explanation

Contemporary means جدید یا نیا

Modern means جدید یا نیا

Explanation

(x - 2)(x + 3) = 0

This implies:

x - 2 = 0 or x + 3 = 0

x = 2 or x = -3

Explanation

Citric acid occurs naturally in:

• Lemons,
• Limes,
• Pineapples,
• Grapefruits,
• Berries (not blueberries),
• Tomatoes,
• Broccoli,
• Carrots,
• and some varieties of Peppers.

Explanation

Sulfuric acid (H₂SO₄) is called the "King of Chemicals" or "King of Compounds" due to its wide use in industries like fertilizers, batteries, and detergents.

It plays a key role in chemical manufacturing.

It is often used to measure a country's industrial strength.

Explanation

The Grand Trunk Road is one of Asia's oldest and longest major roads.

It is formerly known as Uttarapath, Sadak-e-Azam, Shah Rah-e-Azam, Badshahi Sadak, and Long Walk

Length: 3,655 km (2,271 mi)

Status: Currently functional

Existed before 322 BCE–present

For at least 2,500 years, it has linked Central Asia to the Indian subcontinent.

History: Mauryan, Sur, Mughal, and British Empires

East end: Teknaf, Bangladesh

West end: Kabul, Afghanistan

Explanation

A device that is used to convert AC voltage into DC voltage is called A Rectifier.

Inverters and rectifiers are electronic circuits that can change the type of electric current.

a rectifier converts AC to DC.

Explanation

A convex lens has either one or both of its surfaces curving outwards, that is, wider divergence from the plan at the center.

These lenses are used to correct long-sightedness (hypermetropia).

Explanation

• Red (R) Green (G) and blue (B) colors are known as primary colors of light.
• Because of mixing these three colors we are able to make all possible colors.

Key Point

The primary colors of Pigment is:

• Red
• Yellow
• Blue

Explanation

If AB = BA, it means the matrices commute under multiplication.

So, they are called multiplicative commutative (or simply commutative) matrices.

Explanation

• A group of similar cells that perform a specific function combine to form tissue.
• Tissues then combine to form organs.
• Organs work together to form systems.