- Ah
- Bhc
- ✓$\frac{ hv }{ c }$
- D$\frac{ c }{ hv }$
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In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will
|
(a) Increase |
(b) Decrease |
(c) Remain constant |
(d) None of these |
The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point

|
(a) P |
(b) Q |
(c) R |
(d) S |

AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20cm and CB = 80 cm. The resistance R is equal to
|
(a) 2 Ω |
(b) 8 Ω |
(c) 20 Ω |
(d) 40 Ω |
In a mean life of a radioactive sample
|
(a) About 1/3 of substance disintegrates |
|
(b) About 2/3 of the substance disintegrates |
|
(c) About 90% of the substance disintegrates |
|
(d) Almost all the substance disintegrates |