By photoelectric effect, Einstein, proved
|
(a) E = hv |
(b) K.E. = |
(c) |
(d) |
By photoelectric effect, Einstein, proved
|
(a) E = hv |
(b) K.E. = |
(c) |
(d) |
(a) E = hv
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Fraunhofer lines are produced by
|
(a) The element present in the photosphere of sun |
|
(b) The elements present in the chromosphere of the sun |
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(c) The vapour of the element present in the chromosphere of the sun |
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(d) The carbon dioxide present in the atmosphere |
A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is
|
(a) 2.5 |
(b) 7.6 |
(c) 2.5 |
(d) 7.6 |
Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio
| (a) 1 : 1 | (b) 2 : 3 | (c) 2 : 1 | (d) 3 : 2 |
A person using a lens as a simple microscope sees an:
How should people wearing spectacles work with a microscope?
If you are provided three resistances 2 W, 3 W and 6 W. How will you connect them so as to obtain the equivalent resistance of 4 W
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(a) |
(b) |
(c) |
(d) None of these |
A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to
|
(a) sin θ |
(b) tan θ |
(c) cos θ |
(c) cos θ |
A galvanometer can be converted into an ammeter by connecting
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(a) Low resistance in series |
(b) High resistance in parallel |
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(c) Low resistance in parallel |
(d) High resistance in series |