Explanation

• Ghazwa-e-Khandaq is also known as Ghazwa-e-Ahzab and the Battle of the Trench
• Duration: a 27-day-long defence by Muslims of Yathrib.
  
• Means: the Battle of the Confederates
• Fought in Shawwal – Dhu al-Qidah
• It took place in 5 AH (627 CE)
  
• Muslims 3000
• Kufar 10000
  

Last updated question NS on 10-09-2026

Explanation

PTV was founded on 26 November 1964.

It is the first official television station.

PTV started its color transmission in 1976

Additional information

The fourth center was established in Karachi in 1966.

Aslam Azhar is widely considered to be the "father of Pakistan Television".

Explanation

The pair of physical quantities with the same dimensions is Work and Energy.           

Both work and energy have the same dimensional formula: ML²T⁻²

Explanation

• Torque is also called the moment of a force, or simply the moment.
• Measure of the rotational force applied to an object
• Unit of torque: newton metre (N m)
• It is a vector quantity.
• Common symbols: τ, M
• SI unit: N⋅m
• In SI base units kg⋅m2⋅s−2
• Dimension: M L^2 T^−2

Explanation

Silicon is obtained from sand, also known as silica (SiO2), by heating it with a carbon source in a furnace.

The options Lead, Isotope, and Uranium are incorrect because silicon is not directly obtained from them

Instead, silicon is a component of sand, and it exists in different isotopes. 

Explanation

The law of Conservation of linear momentum is valid for all of them - atoms, molecules, and larger objects as well. 

This principle applies to any closed system, meaning the total momentum of all objects within that system remains constant unless an external force acts upon it.

This is true for subatomic particles like atoms and molecules as well as macroscopic objects. 

Explanation

The work done along a closed path in a gravitational field is zero.

This is because the gravitational field is conservative,

Meaning the work done by the gravitational force depends only on the initial and final positions, not the path taken.

When the path is closed, the starting and ending points are the same,

Resulting in no net change in gravitational potential energy and, therefore, zero work done. 

Explanation

When two protons are brought closer together, their potential energy increases. 

Protons repel each other due to their positive charges.

To bring them closer, you need to overcome this repulsive force,

This requires work to be done against the electric field.

This work done is stored as potential energy in the system. 

Explanation

Ethanol is produced from plant materials like sugarcane or corn, making it a renewable biofuel.

Explanation

Density = mass/volume  

So, mass/density = volume  

Unit of mass/density = kg / (kg/m³) = m³  

Hence, unit of density to mass ratio = m³/kg.