For a metallic wire, the ratio V/i (V = the applied potential difference, i = current flowing) is
|
(a) Independent of temperature |
|
(b) Increases as the temperature rises |
|
(c) Decreases as the temperature rises |
|
(d) Increases or decreases as temperature rises, depending upon the metal |
(b) Increases as the temperature rises
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The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
|
(a) Increase |
(b) Decrease |
|
(c) Remain unchanged |
(d) The information is incomplete |
The ripple factor in a half wave rectifier is
|
(a) 1.21 |
(b) 0.48 |
(c) 0.6 |
(d) None of these |
An object is immersed in a fluid. In order that the object becomes invisible, it should
|
(a) Behave as a perfect reflector |
|
(b) Absorb all light falling on it |
|
(c) Have refractive index one |
|
(d) Have refractive index exactly matching with that of the surrounding fluid |
The direction of induced e.m.f. during electromagnetic induction is given by
|
(a) Faraday's law |
(b) Lenz's law |
(c) Maxwell's law |
(d) Ampere's law |
The two waves represented by y1 = a sin(wt) and 
have a phase difference of
|
(a) 0 |
(b) |
(c) |
(d) |
