Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal
|
(a) That the central maxima is narrower |
(b) No diffraction pattern |
|
(c) More number of fringes |
(d) Less number of fringes |
(b) No diffraction pattern
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The electric charge in uniform motion produces
|
(a) An electric field only |
(b) A magnetic field only |
|
(c) Both electric and magnetic field |
(d) Neither electric nor magnetic field |
The magnetic field to a small magnetic dipole of magnetic moment M, at distance r from the centre on the equatorial line is given by (in M.K.S. system)
|
(a) |
(b) |
(c) |
(d) |
In Cu-Fe couple, the flow of current at the temperature of inversion is
|
(a) From Fe to Cu through the hot junction |
|
(b) From Cu to Fe through the hot junction |
|
(c) Maximum |
|
(d) None of the above |
A thin glass (refractive index 1.5) lens has optical power of -5D in air. It's optical power in a liquid medium with refractive index 1.6 will be
|
(a) 25 D |
(b) – 25 D |
(c) 1 D |
(d) None of these |
The focal length of lens of refractive index 1.5 in air is 30 cm. When it is immersed in a liquid of refractive index 
, then its focal length in liquid will be
|
(a) 30 cm |
(b) 60 cm |
(c) 120 cm |
(d) 240 cm |
Identify the paramagnetic substance
|
(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
|
(a) 45° |
(b) 39° |
(c) 20° |
(d) 30° |
