If the current is doubled, the deflection is also doubled in
|
(a) A tangent galvanometer |
(b) A moving coil galvanometer |
|
(c) Both (a) and (b) |
(d) None of these |
(b) A moving coil galvanometer
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If an electron jumps from 1st orbital to 3rd orbital, then it will
|
(a) Absorb energy |
(b) Release energy |
|
(c) No gain of energy |
(d) None of these |
A proton (or charged particle) moving with velocity v is acted upon by electric field E and magnetic field B. The proton will move undeflected if
|
(a) E is perpendicular to B |
|
(b) E is parallel to v and perpendicular to B |
|
(c) E, B and v are mutually perpendicular and |
|
(d) E and B both are parallel to v |
The electrons are emitted in the photoelectric effect from a metal surface
|
(a) Only if the frequency of the incident radiation is above a certain threshold value |
|
(b) Only if the temperature of the surface is high |
|
(c) At a rate that is independent of the nature of the metal |
|
(d) With a maximum velocity proportional to the frequency of the incident radiation |
Mixed 
and 
ions (mass of 
and that of 
beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same then
|
(a) |
|
(b) |
|
(c) All the ions will be deflected equally |
|
(d) No ions will be deflected |
Order of magnitude of density of uranium nucleus is (
|
(a) |
(b) |
(c) |
(d) |
Hubble's law states that the velocity with which the 'milky way' is moving away from the earth is proportional to
|
(a) Square of the distance of the milky way from the earth |
|
(b) Distance of milky way from the earth |
|
(c) Mass of the milky way |
|
(d) Product of the mass of the milky way and its distance from the earth |
