Explanation

ʿUmar ibn al-Khaṭṭāb was the second Rashidun caliph, ruling from August 634 until his assassination in 644.

Explanation

• Karez is the irrigation system of Balochistan.
• This ancient method involves underground channels that transport water from aquifers to the surface.
• It providing a sustainable water supply in arid regions.

Explanation

Explanation

Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia.

Pakistan is the world's fifth-most populous country.

Pakistan is the world's second-largest Muslim population.

Pakistan is the 33rd-largest country by area.

The capital of Pakistan is: Islamabad

the Currency of Pakistan is: the Pakistani rupee

Explanation

Ghulam Muhammad, a Punjabi, had been Jinnah's choice

He served as Pakistan's first finance minister 15 August 1947 – 19 October 1951

Prime Minister: Liaquat Ali Khan, Sir K. Nazimuddin

Deputy: Muhammad Ali (1947–1948), Sir Victor Turner (1948–1951)

Succeeded by: Muhammad Ali

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He served as the third Governor-General of Pakistan,

Born: 29 August 1895, Lahore

Died: 29 August 1956 (aged 61), Lahore

Resting place: Fauji Qabrastan Karachi

Explanation

The modem is short for "Modulator-Demodulator."

A modulator-demodulator or modem is a computer hardware device 

A modulator-demodulator or modem converts data from a digital format into a format .

Explanation

The phrase "Out of the blue" means Unexpectedly/Suddenly.

It refers to something happening without warning or surprise, like a sudden event or occurrence.

Explanation

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ND10-1-2023

Explanation

Because sound is just vibrating air, space has no air to vibrate and therefore no sound in a vacuum.

Sound waves below 20 Hz are known as infrasound.

Sound waves above 20 kHz are known as ultrasound

Sound waves transmit a medium such as a gas, liquid, or solid.

• The speed of sound in air is about 343 meters per second
• The sound travels at 1,481 m/s in water 
• The speed of sound in a vacuum is zero meters per second.

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