Explanation

A mosquito produces a high-frequency sound, while a lion produces a low-frequency roar.

The difference in frequency is what makes their sounds so distinct to our ears.

Higher frequencies sound more like buzzing or whines, while lower frequencies sound deeper and more powerful.

Explanation

A hydrophone is an instrument designed to detect and record sound underwater.

It's essentially the underwater equivalent of a microphone and is commonly used in:

• Marine biology (e.g., studying whale calls or dolphin clicks)

• Submarine and naval operations (e.g., detecting other submarines or ships)

• Environmental monitoring (e.g., measuring underwater noise pollution)

• Underwater research (e.g., studying seismic activity or underwater volcanic eruptions)

Explanation

Muhammad bin Qasim controlled the Indus Valley as far north as the city of Multan.

He defeated Raja Dahir, the last Hindu ruler of Sindh

From 708 to 711, Muhammad ibn al-Qasim led the Sindh conquest

Explanation

Jai Singh, a son of Raja Dahir, did embrace Islam.

He was later killed by Junaid bin Abdur Rahman. 

Raja Dahir was the last Hindu ruler of Sindh in present-day Pakistan.

In 712 CE his kingdom was invaded by the Umayyad Caliphate led by Muhammad bin Qasim

where Dahir died while defending his kingdom.

Aror was the capital of King Dahir

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راجہ داہر موجودہ پاکستان میں سندھ کے آخری ہندو حکمران تھے۔ 712عیسوی میں اس کی سلطنت پر اموی خلافت نے حملہ کیا جس کی قیادت محمد بن قاسم کر رہے تھے۔

جہاں داہر اپنی سلطنت کا دفاع کرتے ہوئے مر گیا۔

Explanation

Hakim Shaibani was a key lieutenant under Muhammad bin Qasim during the conquest of Sindh in the early 8th century.

 Muhammad bin Qasim sent his trusted commander Abu Hakim Shaibani toward Kanauj 

Additional information 

Muhammad ibn Qasim led the Muslim conquest of Sindh

From Raja Dahir in the battle of Aror.

He was the first Muslim to have successfully captured Hindu territories

And initiated the early Islamic India in 712 AD.

Explanation

Explanation

Explanation

Simple Interest = Principal × Rate × Time

$$= 300 times tfrac{5}{100} times 1 = mathbf{15}.$$

Explanation

El Salvador in 2021 become the first country in the world to officially classify Bitcoin as legal currency.

Additional information:

Bitcoin was invented by Satoshi Nakamoto in 2008

It was initially released: On 9 January 2009

Code: BTC, XBT

White paper: "Bitcoin: A Peer-to-Peer Electronic Cash System"

Symbols: BTC, ฿, ₿

Bitcoin: a virtual currency

Central African Republic became the first African country to legalize the digital currency bitcoin in May 2022

Explanation

Rai Ahmad Khan Kharal led a rebellion in the Punjab region against the British during the War of Independence in 1857.

Born in 1803

He was a prominent chieftain of the Kharal tribe in Jhamra, Punjab.

He mobilized local tribes and fought fiercely against British forces

He was martyred on September 21, 1857

He was martyred in a battle against the British near the Ravi River