Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
(d) Curie temperature
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Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young’s double slit experiment, fringe width is given by relation B =
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A 4 mF condenser is charged to 400 V and then its plates are joined through a resistance. The heat produced in the resistance is
|
(a) 0.16 J |
(b) 0.32 J |
(c) 0.64 J |
(d) 1.28 J |
On a glass plate a light wave is incident at an angle of 60°. If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is
|
(a) |
(b) |
(c) |
(d) |
In Thomson's experiment if the value of q/m is the same for all positive ions striking the photographic plate, then the trace would be
|
(a) Straight line |
(b) Parabolic |
(c) Circular |
(d) Elliptical |
As shown in the figure, charges +q and -q are placed at the vertices B and C of an isosceles triangle. The potential at the vertex A is
|
(a) |
(b) Zero |
(c) |
(d) |