Explanation

• The strength of clay is mainly due to cohesion 

Why Clay Has High Cohesion

• Tiny particles: Clay particles are microscopic and flat, like tiny plates.
• Water films: Water molecules stick between these tiny plates.
• Electrostatic forces: Strong electrical charges pull the particles close to each other.

Explanation

• Depression is classified as a psychological and medical mood disorder
• It disrupts normal work and social life.
• Low mood or ongoing sadness
• Loss of pleasure in hobbies.
• Changes in sleep or weight

Explanation

• Paleolithic = Old Stone Age; people hunted animals and gathered wild plants.
• "Old Stone Age," the earliest and longest human era (roughly 2.6 million years ago to about 10,000 BCE).

Explanation

Sandra Harding

• Developed feminist epistemology; identified three approaches:
• Feminist empiricism (1986, The Science Question in Feminism)
• Standpoint theory (1991, Whose Science? Whose Knowledge?)
• Postmodern feminism (1986, later works)

Additional information

• Simone de Beauvoir — The Second Sex (1949)
• Judith Butler — Gender Trouble (1990)
• Betty Friedan — The Feminine Mystique (1963)

Explanation

• The Chalcolithic Period (also called the Copper Age):
• Marks the transition between the Stone Age and the Bronze Age
• Defined by the simultaneous use of stone and copper tools
• Name comes from the Greek chalcos (copper) and lithos (stone)
• It's the period when humans first began working with metal

Explanation

• A series of steps is called a staircase, stairway, or a flight of stairs

Additional information:

• Tread: The flat, horizontal top surface where you place your foot.
• Riser: The vertical part that forms the gap between one step and the next.
• Nosing: The front, rounded edge of the tread that sticks out over the riser

Last updated 14 August 2026 by NA

Explanation

• Cast iron pipes are strong and durable.
• They are mainly used for underground water-supply lines.
• They can withstand high water pressure.
• They have a long service life.
• They are suitable for large and permanent water-supply systems

Explanation

• Plain Sedimentation (4–8 hours): Relies purely on gravity for natural particle settling.
• Coagulation-Sedimentation (2–4 hours): Uses chemical coagulants to accelerate particle clumping and settling.
• Detention Time Formula: Calculated as (T =V/Q), dividing tank volume (V) by flow rate (Q) [KETOS].

Explanation

• Montague fall is a type of canal fall.
• It uses a parabolic glacis for energy dissipation.
• The parabolic shape helps control high-velocity flow.
• It converts excess energy and reduces scouring.
• It is used in irrigation canal systems.

Explanation

A fluid flow in which the velocity vector has the same magnitude and direction at every point at any given instant is known as a uniform flow.