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