Explanation

Fe in a fused mixture of Al2O3, SiO2, and MgO is a highly suitable catalyst for ammonia synthesis;

This combination is often used as a support material for the iron catalyst in the Haber process, enhancing its activity and stability. 

Explanation

All numbers except 50 are perfect squares:

- 81 = 9²  

- 64 = 8²  

- 36 = 6²  

- 25 = 5²  

Explanation

Profit = Selling Price − Cost Price  

= 11,000 − 10,000 = 1,000

Profit % = (Profit / Cost Price) × 100  

= (1,000 / 10,000) × 100 = 10%

Explanation

Sindh is known as Bab-ul-Islam (the gateway of Islam), as it saw the first spread of Islam into South Asia.

Sindh is the third-largest province of Pakistan by land area

Sindh is the second-largest province by population after Punjab

The Sindhi language is the oldest language

Sindhi is written in a version of the Arabic script.

Sindhi is the official language of the Pakistani province of Sindh.

Sindh has 30 Districts and 7 district

There are three Barrages in Sindh

The mountain range located in Sindh is Kirthar Range

N

Explanation

 Bleaching powder is chemically known as calcium oxychloride 

Chemical formula CaOCl₂.

It is used as a disinfectant and bleaching agent.

Explanation

 The centripetal force keeps an object moving in a circular path.  

- Its formula is F = mv² / r, where:  

  - m = mass of the object  

  - v = velocity  

  - r = radius of the circular path  

- It always acts towards the center of the circle.  

- Example: A stone tied to a string and rotated in a circle — the string provides centripetal force.

Explanation

• Humidity in the air was measured by a Hygrometer.
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• A hygrometer is an instrument used to measure relative humidity.
• Humidity is the measure of the amount of moisture in the air.
• A psychrometer is an example of a hygrometer.
• hygrometer.
  
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• The humidity in the air tells us about the ratio of Water vapors in the air

Explanation

Lemon is rich in Vitamin C, which helps boost immunity and improve skin health.

Other citrus fruits like oranges and lime are also high in Vitamin C.

But among the given options, lemon contains the most.

Explanation

The mass per unit volume of a substance is called density (density = mass/volume).

• The formula of Density is: D=m/v
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• Here D is density,
• M is mass &
• V is Volume.
• Density is commonly expressed in units of grams per cubic centimeter.
• The standard units are kg/m³

Explanation

Clean means صاف

Dirty means گندا