Explanation

• Calcium chloride (CaCl₂) is used as a drying agent in a desiccator.
• It absorbs moisture from the air.
• It keeps substances dry and free from water vapor.
• Desiccators are used in laboratories for drying chemicals.
• CaCl₂ is highly hygroscopic.

Last verified 18-06-2026

Explanation

• Activated charcoal is a decolorization agent.
• It removes color impurities from solutions.
• It works by adsorption.
• It has a large surface area for trapping impurities.
• Commonly used in purification processes.

Last verified on 18-06-2026

Explanation

• Chile saltpeter is the common name for sodium nitrate (NaNO₃).
• It is found naturally in Chile and Peru.
• It is used in fertilizers and explosives.

Last verified on 18-06-2026

Explanation

• Magnesite has the chemical formula MgCO₃ (Magnesium carbonate).
• It is an important mineral of magnesium.
• It is mainly used for producing magnesium oxide and refractory materials.
• Magnesite is a carbonate mineral found in many parts of the world.
• Its composition includes magnesium, carbon, and oxygen.

Last verified on 18-06-2026

Explanation

• When a body moves upward, its height from the ground increases.
• Gravitational potential energy depends on height (P.E = mgh), so it increases as height increases.
• The increase in potential energy comes from the conversion of kinetic energy into potential energy.

Last verified on 18-06-2026

Explanation

• CPU stands for Central Processing Unit.
• It is the main part of a computer that processes all instructions.
• It is considered the brain of the computer system.
• It performs all calculations and decision-making tasks.
• It controls the operations of all hardware and software.
• It is located on the motherboard.

Last verified on 10-06-2026

Explanation

• Picosecond (ps) = 10⁻¹² seconds
• SI prefix “pico” means 10⁻¹².
• 1 picosecond = one trillionth of a second.

Additional information:

• Microsecond (μs) = 10⁻⁶ seconds
• Nanosecond (ns) = 10⁻⁹ seconds
• Millisecond (ms) = 10⁻³ seconds
• Femtosecond (fs) = 10⁻¹⁵ seconds
• Attosecond (as) = 10⁻¹⁸ seconds
• Zeptosecond (zs) = 10⁻²¹ seconds
• Yoctosecond (ys) = 10⁻²⁴ seconds

Last verified on 17-06-2026

Explanation

• A 2D array used for descriptive information is called a Table.
• It organizes data in rows and columns.
• Each row represents an entity record.
• Each column represents an attribute of that entity.

Last verified on 17-06-2026

Explanation

• E-banking is also called Online banking.
• It allows banking services through the internet.
• Customers can access accounts without visiting the bank.
• It is a part of modern digital financial system.
• It provides fast and convenient transactions.

Last verified on 17-06-2026

Explanation

• Entity integrity means Primary key must be unique and NOT NULL.
• It ensures every row in a table is uniquely identifiable.
• No two rows can have the same primary key value.
• Primary key cannot be empty or missing.
• It maintains data accuracy in relational databases.

Last verified on 17-06-2026