Five resistances are connected as shown in the figure. The effective resistance between the points A and B is
|
(a) |
(b) |
(c) 15 Ω |
(d) 6 Ω |
(a) 
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If a current of 3.0 amperes flowing in the primary coil is reduced to zero in 0.001 second, then the induced e.m.f. in the secondary coil is 15000 volts. The mutual inductance between the two coils is
|
(a) 0.5 henry |
(b) 5 henry |
(c) 1.5 henry |
(d) 10 henry |
Two identical bar magnets are placed on above the other such that they are mutually perpendicular and bisect each other. The time period of this combination in a horizontal magnetic field is T. The time period of each magnet in the same field is
|
(a) |
(b) |
(c) |
(d) |
What happens to the fringe pattern when the Young’s double slit experiment is performed in water instead or air then fringe width
|
(a) Shrinks |
(b) Disappear |
(c) Unchanged |
(d) Enlarged |
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand
| (a) None | (b) 1 | (c) 2 | (d) 3 |
Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
|
(a) λ |
(b) More than λ |
(c) Less than λ |
(d) Zero |
For a given triode μ = 20. The load resistance is 1.5 times the anode resistance. The maximum gain will be
|
(a) 16 |
(b) 12 |
(c) 10 |
(d) None of the above |
A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced
|
(a) In AD, but not in BC |
(b) In BC, but not in AD |
|
(c) Neither in AD nor in BC |
(d) In both AD and BC |
