Explanation

In 1714, Dutch scientist  Daniel Gabriel Fahrenheit invented the first reliable thermometer,

using mercury instead of alcohol and water mixtures.

In 1724, he proposed a temperature scale which now bears his name.

Galileo made his first telescope in 1609

Barometer Inventor: Evangelista Torricelli

Steam engine Inventor: Thomas Savery

Microscope Inventor: Zacharias Janssen

Explanation

Sayyid Ahmad Shaheed was an Indian Muslim revivalist from Rae Bareli, a part of the historical United Provinces of Agra and Oudh.

Sayed Ahmad Shaheed died 06 March 1831 at Balakot

He is considered as a scholarly authority by Ahl-i Hadith and Deobandi movements

Explanation

China Capital is Beijing.

China Currency is Chinese Yuan.

China official language is Mandarin.

China located is in Continent Asia.

China Primary Religion is N/A.

China Head of Govt. is President - Xi Jinping.

China Parliament called National People’s Assembly.

Tricks for Remember

Explanation

Downloading means receiving data or a file from the Internet on your computer.

Uploading means sending data or a file from your computer to somewhere on the Internet.

Explanation

Stainless steel is a alloys that contain a minimum of approximately 11% chromium, a composition that prevents the iron from rusting and also provides heat-resistant properties.

Explanation

A microphone converts sound into a small electrical current.

Sound waves hit a diaphragm that vibrates, moving a magnet near a coil.

In some designs, the coil moves within a magnet.

Other microphones, such as condenser microphones, work on the principle of capacitance.

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Explanation

Lack of insulin causes diabetes.

Diabetes is a condition that happens when your blood sugar (glucose) is too high.

It develops when your pancreas doesn't make enough insulin.

Explanation

The Pros and Cons means For and against things

Pros and Cons means اونچ نیچ, پس و پیش, نشیب و فراز

Explanation

There are five interlocking rings,

1. coloured blue,
2. yellow,
3. black,
4. green,
5. red on a white field.

The five rings represent the five continents of the world:  Europe, Asia, Africa, The Americas, and Oceania

The symbol was originally designed in 1913 by de Coubertin (Released in 1914).

Explanation

x + y = 30 ... (Equation 1)

x - y = 8 ... (Equation 2)

We can solve these equations by adding them together, which eliminates y:

2x = 38

Dividing both sides by 2 gives us:

x = 19

Now that we have x, we can find y by substituting x into Equation 1:

19 + y = 30

Subtracting 19 from both sides gives us:

y = 11

Now that we have both x and y, we can find their product:

Product = x * y

= 19 * 11

= 209