1221. Which of the properties represent, cathode rays are negatively charged ?

A. Rotate small Paddle wheel
B. Deflected toward positively charged plate *
C. Deflected in magnetic field
D. Both B and C

1222. Cathode rays heat up when strike a thin metal foil because :

A. It has negative charge
B. It travel in straight line
C. It possess Kinetic Energy *
D. It has reducing effect

1223. Canal rays were discovered by:

A. Crooks
B. E.Goldstein *
C. R. Millikan
D. E. Rutherford

1224. Charge to mass ratio of canal rays depends upon :

A. Nature of gas *
B. Nature of Electrodes
C. Pressure
D. Voltage

1225. Which of the following gases when used in discharge tube will give lowest charge to mass ratio of canal rays ?

A. Hydrogen
B. Helium
C. Oxygen *
D. Nitrogen

1226. Unit of plank’s constant is :

A. J/sec
B. J.Sec *
C. J.m
D. J/m

1227. Ratio of radii of second and first orbit of hydrogen atom is :

A. 2
B. 3
C. 4 *
D. 5

1228. The radius of first orbit of hydrogen atom is 0.529 A degree. The radius of first orbit of LI2+ is:

A. 1.27 A degree
B. 0.17 A degree *
C. 0.57 A degree
D. 0.99 A degree

1229. ______ energy of electron is negative :

A. Kinetic
B. Potential
C. Total
D. Both B and C *

1230. Ratio of energy of photon of 250nm to that of 500nm is :

A. 1/2
B. 2 *
C. 1/4
D. 4