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.

Last verified on 12-03-2026

Explanation

• Weight is a vector quantity
• Because it is a force defined as the product of mass and the acceleration due to gravity (W = mg).
• It has both magnitude (amount of force) and direction (downward, towards the center of the Earth)

Additional information 

Mass,  Time, and temperature are scalar quantities

Last updated on 09-03-2026

Explanation

• Protons and neutrons form the nucleus of an atom.
• Together, they are called nucleons because they are nuclear particles.

Additional information:

• Nucleons determine the mass of an atom.
• Isotopes are atoms of the same element with different number of neutrons.

Last verified on 07-03-2026

Explanation

Silicon is widely used in semiconductors because:

• It is abundant in nature.
• It has suitable electrical properties.
• It has excellent thermal stability.
• It forms a stable oxide layer (SiO₂) useful in device fabrication.

Note: Germanium was used earlier, and gallium nitride is used for high-power or high-frequency devices, but silicon remains the standard.

Last updated 14-feb-2026

Explanation

• NIC stands for Network Interface Card.
  • It connects a computer to a network or internet.
  • It can be wired (Ethernet) or wireless (Wi-Fi).
  • Every NIC has a unique MAC address.
  • It enables data communication between devices.

Last verified on 07-02-2026

Explanation

• Engrossed means مشغول
• Absorbed means جذب

Last verified on 01-02-2026

Explanation

LAN stands for local area network

It is a collection of devices connected together in one physical location

For example"

• school
• laboratory
• university campus 
• office building.

LAN covers can be small or large from home network and enterprise network

Additional Information

WAN stands for wide area network.

MAN stands for Metropolitan Area 

WANs and MANs connect many LANs together

WANs and MANs cover a large geographical area

Explanation

• Urea fertilizer contains 46% nitrogen (N).
• Urea is a white crystalline solid.
• It is widely used as a fertilizer and animal feed additive.

Last verified on 31-01-2026

Explanation

The main purpose of cellular respiration is to convert chemical energy stored in nutrients (specifically glucose) into ATP (adenosine triphosphate),

They acts as the usable energy currency for cellular processes.

It breaks down glucose in the presence of oxygen to produce ATP, carbon dioxide, and water. 

Explanation

• Oomycetes are fungus-like organisms, often called water molds.
• Although they resemble true fungi, their cell wall composition is different.
• In oomycetes, the cell wall is mainly composed of cellulose.

Additional information:

• True fungi have chitin in their cell walls, while oomycetes have cellulose.
• A common example of oomycetes is Phytophthora, which causes plant diseases.

Last verified on 23-01-2026