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Diffraction and interference of light suggest
|
(a) Nature of light is electro-magnetic |
(b) Wave nature |
|
(c) Nature is quantum |
(d) Nature of light is transverse |
The amplification factor of a triode is 20 and trans-conductance is 3 milli mho and load resistance 3 
then the voltage gain is
|
(a) 16.36 |
(b) 28 |
(c) 78 |
(d) 108 |
The amount of substance liberated on electrodes during electrolysis when 1 coulomb of electricity is passed, is
|
(a) Chemical equivalent |
(b) Electrochemical equivalent |
|
(c) Equivalent weight |
(d) One mol |
Cathode rays consist of
|
(a) Photons |
(b) Electrons |
(c) Protons |
(d) α -particles |
Light of two different frequencies whose photons have energies 1eV and 2.5eV respectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be
|
(a) 1 : 5 |
(b) 1 : 4 |
(c) 1 : 2 |
(d) 1 : 1 |
What is the respective number of α and β particles emitted in the following radioactive decay 
|
(a) 6 and 8 |
(b) 8 and 8 |
(c) 6 and 6 |
(d) 8 and 6 |
The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii 
and 
respectively. The ratio of the mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is (h = 6.62 
|
(a) 5.9 |
(b) 5.9 |
(c) 5.9 |
(d) 11.8 |
