Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
(b) Aluminium
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A long straight wire carries a current of π amp. The magnetic field due to it will be 5 at what distance from the wire [
permeability of air]
|
(a) |
(b) |
(c) |
(d) |
When an inert gas is filled in the place vacuum in a photo cell, then
|
(a) Photo-electric current is decreased |
|
(b) Photo-electric current is increased |
|
(c) Photo-electric current remains the same |
|
(d) Decrease or increase in photo-electric current does not depend upon the gas filled |
Which of the following figure represents the variation of particle momentum and the associated de-Broglie wavelength
|
(a)
|
(b)
|
(c)
|
(d)
|
A point charge is kept at the centre of a metallic insulated spherical shell. Then
|
(a) Electric field out side the sphere is zero |
(b) Electric field inside the sphere is zero |
|
(c) Net induced charge on the sphere is zero |
(d) Electric potential inside the sphere is zero |
The sun is rotating about its own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show
|
(a) Shift towards red end |
|
(b) Shift towards violet end |
|
(c) Shift towards red end by one line and towards violet end by other |
|
(d) No shift |
Plate resistance of two triode valves is 2 KW and 4 KW, amplification factor of each of the valves is 40. The ratio of voltage amplification, when used with 4 KW load resistance, will be
|
(a) 10 |
(b) |
(c) |
(d) |