Thermal neutrons can cause fission in
|
(a) |
(b) |
(c) |
(d) |
Thermal neutrons can cause fission in
|
(a) |
(b) |
(c) |
(d) |
(a)
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Electric current is due to drift of electrons in
| (a) Metallic conductors | (b) Semi-conductors | (c) Both (a) and (b) | (d) None of these |
Which state of triply ionised Baryllium (
has the same orbital radius as that of the ground state of hydrogen
|
(a) n = 4 |
(b) n = 3 |
(c) n = 2 | (d) n = 1 |
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) |
A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The "Watt-hour" efficiency of the battery is
|
(a) 82.5% |
(b) 80 % |
(c) 90% |
(d) 87.5% |
If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image
|
(a) Remains same |
(b) |
(c) 2 times |
(d) Infinite |
A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself
|
(a) Uniformly in the metal object |
|
(b) Uniformly on the surface of the object |
|
(c) Such that the potential energy of the system is minimised |
|
(d) Such that the total heat loss is minimised |