Explanation

Joseph F. Glidden was born in New York on Jan. 18, 1812.

He invented barbed wire in 1873 and was granted the patent on Nov. 24, 1874.

Gidden  known as the "Father of Barbed Wire".

Explanation

A nurse is preparing a room for a patient with tuberculosis. The specific aspect of this tier of Standard Precautions is that the care  should include: Disposal of sharps in a puncture-resistant container

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Explanation

A concave mirror has a reflective surface that is curved inward and away from the light source.

Explanation

Adam Osborne invented Laptop in 1981.

Explanation

A scanner scans images, printed text, handwriting or an object and converts it to a digital image. 

Scanner is an output device. 

Scanner founder: Russell Kirsch

Russell Kirsch belongs to USA.

Explanation

• • The colour of copper sulphate solution is blue.
  • Copper sulphate solution is blue in colour which on heating at moderate temperature for some time 
    

Explanation

The fan was invented in 1882 by Schuyler Skaats Wheeler. 

Explanation

سرخ رنگ کو جب نیلے رنگ سے ملایا جاتا ہے تو جامنی  رنگ بنتا ہے

Explanation

Television invented John Logie Baird 

First T.V station in Pakistan 1964

This is the oldest surviving colour television in the world. It uses a colour system invented in 1937 by Scottish engineer John Logie Baird. 

Explanation

Celsius and Fahrenheit are two temperature scales. The Fahrenheit and Celsius scales have one point at which they intersect. They are equal at -40 °C and -40 °F.