Explanation

Boltzmann's constant (k_B) is a fundamental constant in physics.

The value of Boltzmann's constant is 1.38 × 10^(-23) J/K.

Explanation

- Mercury has high cohesion (strong attraction between its own molecules).  

- Mercury has low adhesion with most surfaces (weak attraction to other materials).  

- Due to high cohesion and low adhesion, mercury forms rounded droplets and does not spread out like water.  

- This behavior causes mercury to flow as droplets rather than wetting the surface.  

- Mercury’s surface tension is very high, making it behave differently than most liquids.

Explanation

 When a forward bias is applied to a p-n junction:

The potential barrier decreases.

Electrons from the n-side move toward the p-side.

These electrons are minority carriers on the p-side.

As a result, the concentration of electrons on the p-side increases, but only slightly, since it's still a small number compared to the holes (which are majority carriers on the p-side).

Explanation

Water is present beneath the Earth's surface in soil pore spaces and rock formations.  

- Source:

Comes from rainwater, rivers, and lakes that seep into the ground.  

- Storage:

Stored in aquifers (permeable rock layers).  

- Uses:

Drinking water, irrigation, and industrial use.  

- Movement:

Moves slowly through soil and rocks due to gravity and pressure.  

- Recharge:

Replenished by rainfall and surface water infiltration.  

- Importance:

Major source of fresh water, especially in dry areas.  

- Contamination:

Can be polluted by chemicals, waste, affecting health.

Explanation

Explanation

Freezing point of mercury is -38.83C.

The boiling point of Mercury is 356.7 °C.

Mercury is a chemical element

It is commonly known as quicksilver. 

It is the only metal to remain in liquid form at room temperature.

Droplets of liquid mercury are shiny and silver-white with a high surface tension, appearing rounded when on flat surfaces

Explanation

• It takes Mercury approximately 88 Earth days (specifically 87.97 days) to complete one orbit around the Sun
• This means that Mercury's year is equal to 88 Earth days
• Distance: Approx. 58 million km from the Sun
• But its rotation takes nearly 59 days. 
• Speed: ~47 km/s

Last updated question 2 May 2026 by NS

Explanation

Mercury is a chemical element

It is commonly known as quicksilver. 

It is the only metal to remain in liquid form at room temperature.

Droplets of liquid mercury are shiny and silver-white with a high surface tension, appearing rounded when on flat surfaces

Explanation

Pakistan won the T-20 World Cup in 2009

Edition: Second

Hosted by: England

Held: 5 June – 21 June 2009

Winner: Pakistan

Pakistan won for the first time

Runner-up: Sri Lanka

Most wickets taken by: Umar Gul (13 wickets)

Pakistani captain: Younas Khan

Explanation

NaCl is a classic example of an ionic compound

Where sodium (Na) loses an electron to become a positively charged ion (cation),

And chlorine (Cl) gains an electron to become a negatively charged ion (an anion).

Formula: NaCl

Molar mass: 58.44 g/mol

IUPAC ID: Sodium chloride

Melting point: 801 °C

Soluble in: Water, Ammonia, Ethanol, Glycerol, Methanol, Propylene glycol, Formic acid, Formamide

Classification: Salt

Boiling point: 1,465 °C