- AVery large as compared to the load resistance.
- BEqual to the resistance of the load.
- CNon-zero but less than the resistance of the load.
- DZero.
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Imagine an atom made up of a proton and a hypothetical particle of double the mass of the electron but having the same charge as the electron. Apply the Boh’r atom model and consider all possible transitions of this hypothetical particle to the first excited level. The longest wavelength photon that will be emitted has wavelength l (given in terms of the Rydberg constant R for the hydrogen atom) equal to
|
(a) 9/(5R) |
(b) 36/(5R) |
(c) 18/(5R) |
(d) 4/R |
A torch battery consisting of two cells of 1.45 volts and an internal resistance 0.15Ω, each cell sending currents through the filament of the lamps having resistance 1.5ohms. The value of current will be
|
(a) 16.11 amp |
(b) 1.611 amp |
(c) 0.1611 amp |
(d) 2.6 amp |
$1$
$2$
$\sqrt{2}$
$\frac{1}{\sqrt{2}}.$

Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be
|
(a) |
(b) |
(c) |
(d) Zero |
You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5 Ω which can carry a current of 4 amperes. The minimum number of resistances of the type R that will be required for this job
|
(a) 4 |
(b) 10 |
(c) 8 |
(d) 20 |
According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
|
(a) + |
(b) + |
|
(c) |
(d) + |
A nucleus
emits one α and one β particles. The resulting nucleus is
|
(a) |
(b) |
(c) |
(d) |