Explanation:
Inside a uniform spherical shell, the gravitational field is the same everywhere and is equal to zero. The gravitational potential has a constant value inside a uniform spherical shell.
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If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be
|
(a) 0.4 |
(b) 0.3 |
(c) 0.2 |
(d) 0.1 |
Which one of these is non-divisible
|
(a) Nucleus |
(b) Photon |
(c) Proton |
(d) Atom |
If the electric flux entering and leaving an enclosed surface respectively is 
and 
the electric charge inside the surface will be
|
(a) ( |
(b) ( |
(c) ( |
(d) ( |
We are able to obtain fairly large currents in a conductor because
|
(a) The electron drift speed is usually very large |
|
(b) The number density of free electrons is very high and this can compensate for the low values of the electron drift speed and the very small magnitude of the electron charge |
|
(c) The number density of free electrons as well as the electron drift speeds are very large and these compensate for the very small magnitude of the electron charge |
|
(d) The very small magnitude of the electron charge has to be divided by the still smaller product of the number density and drift speed to get the electric current |
In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be
|
(a) 3.4 |
(b) 6.8 |
|
(c) 3.4 |
(d) 6.8 |
Number of secondary electrons emitted per number of primary electrons depends on
|
(a) Material of target |
(b) Frequency of primary electrons |
|
(c) Intensity |
(d) None of the above |
The wavelength of light diminishes μ times (μ = 1.33 for water) in a medium. A diver from inside water looks at an object whose natural colour is green. He sees the object as
|
(a) Green |
(b) Blue |
(c) Yellow |
(d) Red |
