Magnetic permeability is maximum for
|
(a) Diamagnetic substance |
(b) Paramagnetic substance |
|
(c) Ferromagnetic substance |
(d) All of these |
Magnetic permeability is maximum for
|
(a) Diamagnetic substance |
(b) Paramagnetic substance |
|
(c) Ferromagnetic substance |
(d) All of these |
(c) Ferromagnetic substance
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A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image
|
(a) 5 mm |
(b) 1 mm |
(c) 0.5 mm |
(d) 0.1 mm |
In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 8 : 1 |
(d) 16 : 1 |
An electric motor operating on a 60 V dc supply draws a current of 10 A. If the efficiency of the motor is 50%, the resistance of its winding is
|
(a) 3Ω |
(b) 6 Ω |
(c) 15 Ω |
(d) 30 Ω |
In the given figure, potential difference between A and B is
|
(a) 0 |
(b) 5 volt |
(c) 10 volt |
(d) 15 volt |
Gauss’s law should be invalid if
|
(a) There were magnetic monopoles |
|
(b) The inverse square law were not exactly true |
|
(c) The velocity of light were not a universal constant |
|
(d) None of these |
Assertion : When two coils are wound on each other, the mutual induction between the coils is maximum.
Reason : Mutual induction does not depend on the orientation of the coils.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
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) |