Two capacitors 
and 
in series, are connected in parallel to a third capacitor
. This arrangement is then connected to a battery of e.m.f. = 2V, as shown in the figure. How much energy is lost by the battery in charging the capacitors
|
(a) 22 |
(b) 11 |
(c) |
(d) |
(b) 11 
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The Bohr radius of the fifth electron of phosphorus (atomic number = 15) acting as dopant in silicon (relative dielectric constant = 12) is
|
(a) 10.6 Å |
(b) 0.53 Å |
(c) 21.2 Å |
(d) None of these |
In 
nucleus, there are
|
(a) 138 protons and 88 neutrons |
(b) 138 neutrons and 88 protons |
|
(c) 226 protons and 88 electrons |
(d) 226 neutrons and 138 electrons |
An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
|
(a) Circular |
(b) Elliptical |
(c) Parabola |
(d) None of these |
The temperature (T) dependence of resistivity (r) of a semiconductor is represented by
(a)
|
(b)
|
(c)
|
(d)
|
A nucleus of 
originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus
| (a) 4v/206 | (b) 4v/214 | (c) v/206 | (d) v/214 |
Two coherent sources of light can be obtained by
|
(a) Two different lamps |
|
(b) Two different lamps but of the same power |
|
(c) Two different lamps of same power and having the same colour |
|
(d) None of the above |
