Explanation

A seismograph is an instrument used to detect and record earthquakes.

It consists of a mass attached to a fixed base

During an earthquake, the base moves and the mass does not.

Explanation

Karl Landsteiner discovered ABO blood group system.

He was an Austrian scientist.

Karl Landsteiner received Noble Prize in 1930

Blood Group System was discovered in 1900.

Explanation

Thomas Savery is considered the inventor of the first commercially used steam-powered device.

In 1698, he patented a steam-powered pump designed to remove water from mines.

Explanation

Michael Faraday proposed the laws of electromagnetic induction in the year 1831.

Faraday's law or the law of electromagnetic induction is the observation or results of the experiments conducted by Faraday.

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RY 15-01-2023

Explanation

Edward Jenner (1749-1823) was an English physician and scientist who discovered the smallpox vaccine in 1796.

He observed that milkmaids who had contracted cowpox, a similar virus, were immune to smallpox.

Explanation

Johannes Kepler published his first two laws about planetary motion in 1609, having found them by analyzing the astronomical observations of Tycho Brahe.

Kepler's third law was published in 1619.

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RY 15-01-2023

Explanation

Ibn al-Haytham presented the theory of reflection and refraction of light

He is also known as Alhazen

His work, particularly his "Book of Optics", is titled Kitab al-Manazir, written during 1011–1021.

Born: c. 965 (c. 354 AH) Basra, Buyid Emirate

Died: c. 1040 (c. 430 AH)[1] (aged around 75) Cairo, Fatimid Caliphate

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

Explanation

The Wright brothers completed the world's first successful controlled powered flight in 1903

The Wright brothers name are: Orville Wright and Wilbur Wright

They were American inventors and aviation pioneers.

Explanation

Ernest Rutherford was a New Zealand-born British physicist who came to be known as the father of nuclear physics.