Which one of the following is an alloy (mixture) and not a metal?

1. 1. Steel
   2. Iron
   3. Magnesium
   4. Potassium

Which is the most abundant gas in the Earth’s atmosphere?

1. 1. Nitrogen
   2. Oxygen
   3. Carbon dioxide
   4. Methane

Who invented the cotton gin?

1. 1. Eli Whitney
   2. Samuel Crompton
   3. Edmund Cartwright
   4. Richard Arkwright

Who formulated the electromagnetic theory?

1. 1. Hans Geiger
   2. Michael Faraday
   3. James Clerk Maxwell
   4. Heinrich Hertz

Who was the first person to televise pictures of moving objects?

1. 1. John Logie Baird
   2. George Carey
   3. C.F. Jenkins
   4. Paul Nipkow

Who is discovered X rays?

1. 1. Wilhelm Conrad Rontgen
   2. Max von Laue
   3. Max Planck
   4. Marie Curie

Who is considered the founder of modern chemistry?

1. 1. Antoine-Laurent Lavoisier
   2. Henry Cavendish
   3. Germain Henri Hess
   4. Sadi Carnot

Who invented the internal combustion engine?

1. 1. Franco Modigliani
   2. Rudolf Diesel
   3. Carl Benz
   4. Jacques Besson

An effective oral vaccine against polio was first developed by _____.

1. 1. Alexander Fleming
   2. Stanley Lemon
   3. Dennis Carlo
   4. Jonas Salk

Who among the following contributed to deciphering the genetic code?

1. 1. J.D. Watson and Francis Crick
   2. Linus Pauling
   3. Marshell Nirenberg, Severo Ochoa and Hargobind Khorana
   4. Barbara McClintock