Explanation

• In the periodic table, a rows is considered to be a periods.
• Periods are the horizontal rows of elements in the periodic table.

Explanation

• Electronic configuration refers to the distribution of electrons within an atom or molecule.
• It shows how the electrons are arranged in different energy levels (shells) and sublevels (orbitals) around the nucleus.

Explanation

• Iron is essential for making hemoglobin, a protein in red blood cells that carries oxygen.
• Iron deficiency can lead to anemia, causing fatigue and weakness.
• Copper mineral builds red blood cells.
• It is also involved in the building of bones.

Note: Copper is also right answer According to Sindh Textbook Board, Jamshoro

Explanation

The process of artificial rain is called cloud seeding.

It involves dispersing substances into the atmosphere to encourage precipitation from clouds.

Explanation

• Replication is the process by which a cell makes an exact copy of its DNA before cell division, ensuring that the new cell receives a complete set of genetic instructions.
• This process is crucial for the transmission of genetic information from one generation of cells to the next.

Explanation

• Cholera is a waterborne disease caused by the bacterium Vibrio cholerae, which is typically found in contaminated water sources.
• If a child has cholera, it indicates that they have ingested contaminated water.
• It addressing water pollution is crucial to prevent further spread of the disease.

Water pollution can cause:

• Waterborne diseases (cholera, typhoid, diarrhea)
• Death of aquatic life (fishes, animals, plants)
• Health problems (immune depression, reproductive failure, acute poisoning)

Explanation

• Asthma is a respiratory disease that can be triggered or exacerbated by exposure to air pollution.
• Air pollution can irritate the airways, trigger asthma attacks, and make symptoms worse.

Air pollution can cause:

• Respiratory problems: asthma, pneumonia, lung cancer
• Irritation: headaches, eyes and nose irritation, sore throat
• General symptoms: nausea, drowsiness, ill feeling
• Impaired judgment and weakened cognitive function

Explanation

The law of conservation of momentum states that the total momentum of a closed system (such as a system of two bodies) remains constant over time, as long as there are no external forces acting on the system.

This means that the total momentum before a collision is equal to the total momentum after the collision.

Explanation

• Red light has the longest wavelength, approximately 620-750 nanometers (nm).
• While violet light has the shortest wavelength, approximately 380-450 nm.
• The order of colours in the spectrum, from longest to shortest wavelength, is: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).

Explanation

• A barcode reader, also called a price scanner or point-of-sale (POS) scanner.
• It is a hand-held or stationary input device.
• It used to capture and read information contained in a barcode.