Explanation

• Christopher Latham Sholes invented the modern typewriter (patent 1868).
• Made the QWERTY keyboard (1873).
• First mass-produced: Remington No. 1 (1873).

Explanation

• The word "trampoline" comes from Spanish and Italian.
• Origin: Derived from trampolín / trampolino (springboard).
• Root: Links to trampoli (stilts) and trample
• English Name: Trademarked by George Nissen in the 1930s.

Last updated 27-07-2026 by NA

Explanation

• The visible light spectrum for the human eye generally ranges from approximately 380 to 750 nanometers (nm), with standard limits often cited from 400 to 700 nm. 

Wavelength Ranges by Color

1. Violet: 380 nm to 450 nm
2. Blue: 450 nm to 485 nm
3. Green: 485 nm to 500 nm
4. Yellow: 500 nm to 565 nm
5. Orange: 565 nm to 625 nm
6. Red: 625 nm to 750 nm 

Last updated 27-07-2026 by NA

Explanation

• Slate is a metamorphic rock.
• It is mainly formed from shale or mudstone.
• Formation occurs under low-grade heat and pressure.
• Volcanic ash can also contribute to its formation.
• Type: Fine-grained, foliated metamorphic rock.

Last updated 27-07-2026 by NA

Explanation

• SI stands for the International System of Units
• The world's standard modern metric system used for science, commerce, and everyday measurements.

The SI system is built upon seven fundamental base units: 

1. Metre (m) – for length
2. Kilogram (kg) – for mass
3. Second (s) – for time
4. Ampere (A) – for electric current
5. Kelvin (K) – for thermodynamic temperature
6. Mole (mol) – for amount of substance
7. Candela (cd) – for luminous intensity 

Last updated 27-07-2026 by NA

Explanation

• An Islamic state is answerable to Allah Almighty,
• Based on the core Islamic principle of divine sovereignty. 

Last updated 27-07-2026 by NA

Explanation

Explanation

• A canal usually originates from a headworks.
• Headworks are structures built across or near a river to divert and control water.
• They supply water to canals for irrigation and other purposes.
• Example: The Lower Chenab Canal originates from Khanki Headworks.

Last updated 27-07-2026 by NA

Explanation

• Phrase: “A Pakistan player and his Indian rival”
• It is not a fixed idiom.
• It is a descriptive phrase.
• It refers to two competitors from Pakistan and India.

Last updated 27-07-2026 by NA

Explanation

• Indirect Speech: The doctor asked Sara if she had pain in her leg.
• Reporting verb: said to → asked because it is a question.
• Question type: It is a Yes/No question, so we use if.
• Pronoun change: you → she.
• Tense change: have → had.

Last updated 27-07-2026 by NA