The sky appears blue because the earths _____.

1. 1. Reflects blue light
   2. Scatters blue light
   3. Transmits blue light
   4. has actual blue cover

DDT, when invented in 1939, was hailed as the ultimate insecticide, only to be withdrawn in the US in 1972 due to its adverse impact on environment. Who invented it?

1. 1. George Biro
   2. L H Baekeland
   3. Charles Drew
   4. Paul Muller

When was helicopter developed?

1. 1. 1937
   2. 1939
   3. 1940
   4. 1950

According to Igor Sikorsky, he just added an engine to a Leonard da Vinci design. What did he invent?

1. 1. Jet Plane
   2. Submarine
   3. Hovercraft
   4. Helicopter

Like many unsung inventors, he committed suicide in 1937. Though he invented Nylon in 1935, it was Dupont who commercialized its production in 1938. Name this unfortunate inventor.

1. 1. Wallace Carothers
   2. L H Baekeland Cholera
   3. Wilhelm Einthoven
   4. Edwin Armstrong

Laszlo and Georg Biro invented which piece of writing instrument in 1938?

1. 1. Ballpont pen
   2. Fountain Pen
   3. Graphite Pencil
   4. Roller ballpen

Which invention by Frank Whittle in 1937 revolutionized the air transport industry after World War II?

1. 1. Helicopter
   2. Jet Aviation Fuel
   3. Jet Engine
   4. Black Box

Which piece of equipment found in cars and other commercial vehicles was originally designed by Marry Anderson in 1902?

1. 1. Windscreen wipers
   2. Power steering
   3. Power Window
   4. air bag

Maria Montessori developed a system in 1907 which later on became a global standard. What?

1. 1. Montessori system of pre-schooling
   2. Blood-plasma storage system
   3. Data and text transfer system across computer network
   4. Colour TV transmission system

Which wonder material was invented by Baekeland in 1907?

1. 1. Nylon
   2. Bakelite
   3. Cellophane
   4. Rayon