When a person enters a dark room from bright light, he is not able to see clearly for a little while because _____.

1. 1. Eye is unable to adjust itself immediately
   2. Retina becomes insensitive momentarily
   3. Iris is unable to dilate the pupil immediately
   4. Distance between the lens and retina takes time to adjust

Which part of the camera is analogue to the retina in the human eye?

1. 1. Lens
   2. Film
   3. Aperture
   4. Shutter

Dolly is the name of the _____.

1. 1. First human fossil
   2. First test-tube baby
   3. First cloned monkey
   4. First cloned sheep

The most important stimulant in tea leaves is _____.

1. 1. Caffeine
   2. Theine
   3. Brucine
   4. Phenylalanine

DDT, when invented in 1939, was hailed as the ultimate insecticide, only to be withdrawn in the US in 1972 due to its adverse impact on environment.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