Explanation

Brazing works best on copper because it has excellent thermal conductivity and wets well with filler metals.

Copper does not form a difficult oxide layer during brazing, ensuring a strong joint.

Copper and its alloys are most commonly brazed materials in plumbing and electrical work.

Explanation

In synthetic sand, water acts as the binder when mixed with silica sand and clay.

It helps provide plasticity and strength to the mould.

The amount of water must be carefully controlled to avoid defects in casting.

Explanation

The largest university in Pakistan is Punjab University.

It was established in 1882.

It is the oldest higher learning institution in the country.

The University of Agriculture, Faisalabad (UAF) is the largest in terms of area, with a campus spanning 2,550 acres. 

Explanation

Barani land refers to agricultural land in Pakistan that is entirely dependent on rainfall for cultivation.

It is common in arid and semi-arid regions where irrigation facilities are limited.

Crop yields on Barani land vary greatly depending on seasonal rainfall.

Explanation

Under the Indus Waters Treaty of 1960, the waters of the six main rivers of the Indus Basin were divided between India and Pakistan:

Western Rivers (Pakistan's Share): The treaty assigned the Indus, Jhelum, and Chenab to Pakistan for unrestricted use (with limited exceptions for India for power generation and irrigation).

Eastern Rivers (India's Share): The Sutlej, Beas, and Ravi were assigned to India for exclusive use.

Explanation

• Farooq Haider was known as the creator of the fictional puppet character Uncle Sargam introduced in 1976 in children's television show Kaliyan.
• Farooq was also a cartoonist, newspaper columnist and wrote for the newspaper Daily Nai Baat in Lahore and under the pen name "Meethay Karelay" (English: "Sweet Bitter gourd").
  

Explanation

WAPDA (Water and Power Development Authority) was established to manage water resources and electricity generation in Pakistan.

It oversees dams, power plants, and irrigation projects.

WAPDA plays a key role in national development and flood management.

Explanation

The Khewra Salt Mine is also known as the Mayo Salt Mine.

It is located in the Salt Range mountains in the Jhelum District of Punjab, Pakistan.

This low mountain system extends approximately 300 kilometers between the Jhelum and Indus rivers.

It remains the world's second-largest salt mine and Pakistan's largest and oldest.

The mine features unique structures made entirely of salt bricks, including a replica of the Badshahi Mosque.

It is a salt hospital for asthma patients, and artistic carvings like a model of the Great Wall of China.

Explanation

The Kirthar Range is a significant mountain range in southern Pakistan.

It marks the boundary between the provinces of Sindh and Balochistan.

It extends for approximately 300 kilometers (190 miles) from the Mula River southward to Cape Monze on the Arabian Sea. 

Explanation

Muzara’ah is an agricultural system where land is leased in return for a share of the crop.

It allows farmers without land to cultivate and share the produce with the landowner.

This practice is common in rural Pakistan and helps manage land and labor resources efficiently.