The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is
|
(a) Infinite |
(b) Five |
(c) Three |
(d) Zero |
(b) Five
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The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (Velocity of light = 3
)
|
(a) 1.5 |
(b) 2.5 |
(c) 3 |
(d) 7.5 |
A thin mica sheet of thickness 2 
and refractive index μ = 1.5 is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift
|
(a) 2 fringes upward |
(b) 2 fringes downward |
(c) 10 fringes upward |
(d) None of these |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
The refractive index of water and glass with respect to air is 1.3 and 1.5 respectively. Then the refractive index of glass with respect to water is
|
(a) |
(b) |
(c) |
(d) |
Faraday's laws of electrolysis are related to
|
(a) The atomic number of positive ion |
(b) The equivalent weight of electrolyte |
|
(c) The atomic number of negative ion |
(d) The velocity of positive ion |
In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon
|
(a) Intensity of light |
(b) Frequency of incident light |
|
(c) Velocity of incident light |
(d) Both intensity and velocity of light |
The magnetic compass is not useful for navigation near the magnetic poles because
|
(a) The magnetic field near the poles is zero |
|
(b) The magnetic field near the poles is almost vertical |
|
(c) At low temperature, the compass needle looses its magnetic properties |
|
(d) Neither of the above |
