In 
solution when electric current equal to 2.5 faraday is passed, the gm equivalent deposited on the cathode is
|
(a) 1 |
(b) 1.5 |
(c) 2 |
(d) 2.5 |
(d) 2.5
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In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
|
(a) 1/2 |
(b) 2 |
(c) -1/2 |
(d) -2 |
The X-ray wavelength of 
line of platinum (Z=78) is 1.30 
The X –ray wavelength of line of Molybdenum (Z = 42) is
|
(a) 5.41Å |
(b) 4.20Å |
(c) 2.70Å |
(d) 1.35 Å |
The current in a coil decreases from 1 A to 0.2 A. In 10sec. Calculate the coefficient of self inductance. If induced emf is 0.4 volt.
|
(a) 5 H |
(b) 3 H |
(c) 4 H |
(d) 2 H |
For a substance the average life for a-emission is 1620 years and for b emission is 405 years. After how much time the 1/4 of the material remains after a and b emission
|
(a) 1500 years |
(b) 300 years |
(c) 449 years |
(d) 810 years |