Explanation

• The age of a tree is determined by its Rings (Number of Annual Rings).
• Each annual ring generally represents one year of growth.
• Counting the rings on the trunk helps determine the tree's age.
• The study of tree rings is called Dendrochronology.

Last verified on 20-07-2026

Explanation

• Zam Zam means "to stop."
• The Zamzam Well is located within the Masjid al-Haram in Mecca, Saudi Arabia.
• It 20 meters (66 feet) east of the Kaaba.
• Millions of pilgrims visit the well each year during Hajj or Umrah to drink its water.

Last verified on 30-06-2026

Explanation

• K-2 (Godwin Austin) has a total height of 8,611 meters (28,251 feet).
• It is the second-highest mountain in the world after Mount Everest.
• K2 is part of the Karakoram Range.
• It is located on the Pakistan–China border in the Gilgit-Baltistan region of Pakistan.
• The letter "K" stands for Karakoram.

Last verified on 12-03-2026

Explanation

• Rabi crops are sown in winter (October–December) and harvested in spring (March–April).
• Wheat is the major Rabi crop, especially in Pakistan and India.

Additional information:

• Kharif crops are sown in summer (April–June) and harvested in autumn (September–October).
• Rice is the major Kharif crop, grown during the monsoon season.

Last verified on 24-05-2026

Explanation

Acute angles measure less than 90 degrees.

Additional information:

Right angles measure 90 degrees.

Obtuse angles measure more than 90 degrees.

Last verified on 13-03-2026

Explanation

• Wavelength is the distance between two successive crests or two successive troughs in a transverse wave.
• It represents one complete cycle of a wave.

Additional information:

• Symbol used: λ (Lambda)
• SI unit: meter (m)
• Wave formula: v = fλ
• Example wavelength values: 1 m, 0.5 m, 10 cm, 500 nm, 700 nm
• Visible light wavelength range: ~400 nm – 700 nm

Last verified on 12-03-2026

Explanation

Ultimate load is the maximum load a member can carry before failure.

It is used to design structures with a factor of safety for safety margins.

Explanation

Creep is the gradual increase in strain under a constant load over time.

Common in metals, concrete, and polymers under sustained stress.

Explanation

Centrifugal pumps are ideal for low-head, high-flow applications.

They efficiently move large volumes of water at moderate pressures.

Explanation

Laying pipes at least 75 cm deep protects them from surface loads and freezing.

Ensures durability and uninterrupted water supply.