When a PN junction diode is reverse biased
|
(a) Electrons and holes are attracted towards each other and move towards the depletion region |
|
(b) Electrons and holes move away from the junction depletion region |
|
(c) Height of the potential barrier decreases |
|
(d) No change in the current takes place |
(b) Electrons and holes move away from the junction depletion region
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The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
|
(a) A |
(b) B |
(c) C |
(d) D |
The rays parallel and close to the principal axis are called:
Fusion reaction takes place at high temperature because
|
(a) Atoms are ionised at high temperature |
|
(b) Molecules break-up at high temperature |
|
(c) Nuclei break-up at high temperature |
|
(d) Kinetic energy is high enough to overcome repulsion between nuclei |
When the speed of a dc motor increases the armature current
|
(a) Increases |
|
(b) Decreases |
|
(c) Does not change |
|
(d) Increases and decreases continuously |
Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
