Explanation

• 3 equations of condition are added by an internal hinge in a 3D frame when 2 members meet.
• Formula: The exact number of releases is 3(m' - 1), where m' is the number of connected members.
• Action: It removes 3 rotational connections (bending and twisting moments) but still passes 3 translational forces (pushing, pulling, and sliding forces)
• Result: It reduces the total structural locking count (static indeterminacy) by 3.

Explanation

Total possible outcomes = 2⁴ = 16.

The probability of getting no head (all tails) is 1/16.

Probability of getting at least one head = 1 − P(no head).

Therefore: 1 − 1/16 = 15/16.

Explanation

• The Sand Replacement Method is a field test used to determine the in-situ (field) density of soil.
• It is commonly used for compacted soil and earthwork.
• The method involves excavating a small hole in the soil.
• The volume of the hole is determined using calibrated sand

Explanation

• Poisson’s Ratio (μ or ν) is the ratio of lateral strain to longitudinal strain.
• Formula: ν = Lateral Strain / Longitudinal Strain
• Longitudinal strain occurs in the direction of the applied load.
• Lateral strain occurs perpendicular to the applied load.
• It is a dimensionless quantity.
• It is represented by the Greek letter ν (nu).

Explanation

• River: Indus River
• Located: Kashmore, Sindh
• Foundation Laid: February 1957
• Foundation by: President Iskander Mirza
• Completed: 1962
• Construction Cost: 474.8 million rupees

Last verified on 09-07-2026

Explanation

• Atmospheric pressure at sea level is 1 atm

Which equals:

• 101.325 kPa (1,013.25 hPa/millibars)
• 760 mmHg, or about 14.7 psi.

Explanation

• For flow in a circular pipe, turbulent flow occurs when the Reynolds number is above 4,000
• Reynolds number (Re) determines the type of flow:
• Re < 2000 → Laminar flow
• 2000 < Re < 4000 → Transitional flow
• Re > 4000 - 5000 → Turbulent flow
• For most practical cases, turbulence begins around Re = 5000.

Explanation

• Canal Lock: A hydraulic structure used to raise or lower boats between different water levels.
• It works like a water elevator.
• It has a closed chamber and gates.
• The chamber is filled or emptied with water to move boats.

Explanation

• Magma: Hot liquid rock located deep underground inside the mantle or crust
• When this molten rock erupts or flows onto the Earth's surface, it is known as lava
  
  

Explanation

The initial setting of cement is caused by:

• Hydration of Tricalcium Aluminate (C₃A).
• Reaction of C₃A with water, which starts rapidly after mixing.
• Formation of calcium aluminate hydrates, causing the paste to stiffen.
• Gypsum is added to slow down this reaction and prevent flash setting.