- ADiffusion
- BDrift
- CBoth drift and diffusion
- DDrift in p region and diffusion in n region
Explanation:
Three important phenomena occurs during formation of pn junction:
Diffusion, Formation of space charge, Drift.
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The capacity of a parallel plate condenser is 15μF, when the distance between its plates is 6 cm. If the distance between the plates is reduced to 2 cm, then the capacity of this parallel plate condenser will be
|
(a) 15 μF |
(b) 30 μF |
(c) 45 μF |
(d) 60 μF |
An oscillator is nothing but an amplifier with
|
(a) Positive feed back |
(b) Large gain |
|
(c) No feedback |
(d) Negative feedback |
A biconvex lens of glass having refractive index 1.47 is immersed in a liquid. It becomes invisible and behaves as a plane glass plate. The refractive index of the liquid is:
Assertion : Soft iron is used as a core of transformer.
Reason : Area of hysteresis is loop for soft iron is small.
|
(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 dispersive power of the material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is
|
(a) 0.08 cm |
(b) 0.08/20 cm |
(c) 1.6 cm |
(d) 0.16 cm |
Given a point source of light, which of the following can produce a parallel beam of light
|
(a) Convex mirror |
|
(b) Concave mirror |
|
(c) Concave lens |
|
(d) Two plane mirrors inclined at an angle of 90° |
Magnetic dipole moment of a rectangular loop is
|
(a) Inversely proportional to current in loop |
|
(b) Inversely proportional to area of loop |
|
(c) Parallel to plane of loop and proportional to area of loop |
|
(d) Perpendicular to plane of loop and proportional to area of loop |
