If V be the accelerating voltage, then the maximum frequency of continuous X-rays is given by
(a) 
|
(b) 
|
(c)
|
(d) 
|
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The work done in turning a magnet of magnetic moment 'M' by an angle of 90° from the meridian is 'n' times the corresponding work done to turn it through an angle of 60°, where 'n' is given by
|
(a) 1/2 |
(b) 2 |
(c) 1/4 |
(d) 1 |
If a slab of insulating material 4 
thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by 3.5 to restore the capacity to original value. The dielectric constant of the material will be
|
(a) 6 |
(b) 8 |
(c) 10 |
(d) 12 |
The wavelength of light in two liquids ‘x' and ‘y' is 3500 Å and 7000 Å, then the critical angle of x relative to y will be
|
(a) 60° |
(b) 45° |
(c) 30° |
(d) 15° |
Why does a straight rod appear bent in water?
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is
|
(a) |
(b) |
(c) |
(d) |
