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 |
(b) Q
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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be
|
(a) |
(b) |
(c) |
(d) |
Lenz’s law applies to
|
(a) Electrostatics |
(b) Lenses |
|
(c) Electro-magnetic induction |
(d) Cinema slides |
A wire of resistance 10 W is bent to form a circle. P and Q are points on the circumference of the circle dividing it into a quadrant and are connected to a Battery of 3 V and internal resistance 1 W as shown in the figure. The currents in the two parts of the circle are
|
(a) |
(b) |
|
(c) |
(d) |
A radioactive material has a half-life of 8 years. The activity of the material will decrease to about 1/8 of its original value in
|
(a) 256 year |
(b) 128 year |
(c) 64 year |
(d) 24 year |
A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is
|
(a) Zero |
(b) α |
(c) |
(d) 2 |
Antiparticle of electron is
|
(a) |
(b) |
(c) Positron |
(d) Neutrino |
