1351. Who discovered X-Rays?

A. Ernest Rutherford
B. Niels Bohr
C. Wilhelm Roentgen *
D. J.J. Thomson

1352. Zero was invented by :

A. Al Khwarizmi *
B. Ibn Rushed
C. William Kelvin
D. None of these

1353. Whom propounded the theory that the earth revolves round the sun?

A. Galileo
B. Newton
C. Compermicus *
D. Kepler

1354. Who discovered Hydrogen ?

A. Joseph Priestley
B. Henry Cavendish *
C. Humphry Davy
D. Dmitri Mendeleyev

1355. Who built the first fully practical airplane ?

A. Henry Ford
B. Wilbur and Orville Wright *
C. Albert Einstein
D. Thomas Edison

1356. Calculating machine is associated with :

A. Pascal *
B. Newton
C. Franklin
D. None of these

1357. Who invented typewriter ?

A. Dalton
B. Pascal
C. Sholes *
D. Waterman

1358. Who invented Radar ?

A. J.H. Van Tassel
B. Wilhelm K. Rontgen
C. P.T. Farnsworth
D. A.H. Taylor and Leo C. Young *

1359. Who among the following evolved the concept of relationship Between mass and energy ?

A. Einstein *
B. Planck
C. Dalton
D. Rutherford

1360. Which instrument is used to measure the gas pressure ?

A. Manometer *
B. Magnometer
C. Barometer
D. Microphone