The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by
|
(a) sin θ |
(b) cos θ |
(c) tan θ |
(d) cot θ |
(d) cot θ
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A divergent lens will produce
|
(a) Always a virtual image |
(b) Always real image |
|
(c) Sometimes real and sometimes virtual |
(d) None of the above |
Two point charges +8q and -2q are located at x = 0 and x = L respectively. The location of a point on the x-axis at which the net electric field due to these two point charges is zero is
|
(a) 8 L |
(b) 4 L |
(c) 2 L |
(d) |
The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be
|
(a) 5 μF |
(b) 10 μF |
(c) 20 μF |
(d) 40 μF |
The resistivity of a wire depends on its
|
(a) Length |
(b) Area of cross-section |
(c) Shape |
(d) Material |
A student has 10 resistors of resistance ‘r’. The minimum resistance made by him from given resistors is
|
(a) 10 r |
(b) |
(c) |
(d) |
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) |
The direction of induced current is such that it opposes the very cause that has produced it. This is the law of
|
(a) Lenz |
(b) Faraday |
(c) Kirchhoff |
(d) Fleming |
