A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be
|
(a) 4 Ω |
(b) 8 Ω |
(c) 0.25 Ω |
(d) 2 Ω |
(a) 4 Ω
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For electron moving in nth orbit of H-atom the angular velocity is proportional to
|
(a) n |
(b) 1/n |
(c) n3 |
(d) 1/n3 |
A thin equiconvex lens is made of glass of refractive index 1.5 and its focal length is 0.2 m, if it acts as a concave lens of 0.5 m focal length when dipped in a liquid, the refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance
|
(a) 11.4 |
(b) 3.8 |
(c) 3 |
(d) None of these |
If the current is halved in a coil, then the energy stored is how much times the previous value
|
(a) |
(b) |
(c) 2 |
(d) 4 |
The energy stored in a 50 mH inductor carrying a current of 4 A will be
|
(a) 0.4 J |
(b) 4.0 J |
(c) 0.8 J |
(d) 0.04 J |
The curve between charge density and distance near P-N junction will be
(a)
|
(b)
|
(c)
|
(d)
|
