Who was the first to take important active step in the development of periodic table?

1. 1. Cavendish
   2. Mendeleev
   3. Dalton
   4. Bohr

Which one of the following pairs is correctly matched?

1. 1. Madam Curie– X-ray
   2. Albert Einstein — Photoelectric effect
   3. Linus Pauling — Electron
   4. C.V. Raman — Stock effect

Who, among the following, discovered that the atoms of some naturally-occurring elements were not exactly alike and when?

1. 1. F.W. Aston –1919
   2. Neils Bohr- 1913
   3. Albert Einstein-1911
   4. Dalton-1909

Who, amongst the following, was the first to observe ultra violet rays and when?

1. 1. William Harschel — 1800
   2. Johann Wilhelm Ritter-1801
   3. Rutherford-1911
   4. August Comte- 1844

The scientist who explained about blood circulation for the first time:

1. 1. Antonyvan Leewen Hock
   2. William Harvey
   3. Gregor Mendel
   4. Ronald Ross

which of the following is the correct combination of the inventors and the inventions?

1. 1. Galileo Galilei –Transistors
   2. Elisha Thomson — Windmill
   3. J.L. Baird — Television
   4. Sir Frank Whittle — Laser

One of the most important theories of general biology was proposed independently by two scientists in the 19th century. The scientists were _____.

1. 1. Watson and Crick
   2. Mendel and Lamarck
   3. Wallace and Darwin
   4. Beadle and Tatum

Insulin was discovered by _____.

1. 1. Alexander Flemming
   2. Edmond Fischer
   3. Dr. F.G. Banting
   4. Joseph E. Murray

Which of the following are the discoveries of Einsten?

1. 1. Radioactivity and Photoelectric effect
   2. Radioactivity and theory of relativity
   3. Theory of relativity and photoelectric effect
   4. X-rays and photoelectric effect

Cholera bacillus was discovered by _____.

1. 1. Luis Pasteur
   2. Ronald Ross
   3. Robert Koch
   4. Joseph Lister