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
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(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 |
(d) In both AD and BC
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When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h = 6.6 
|
(a) 4.16 |
(b) 3.32 |
|
(c) 1.05 |
(d) 2.08 |
The amplification factor of a triode is 20 and trans-conductance is 3 milli mho and load resistance 3 
then the voltage gain is
|
(a) 16.36 |
(b) 28 |
(c) 78 |
(d) 108 |
A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
|
(a) X is P-type, Y is N-type and the junction is forward biased |
|
(b) X is N-type, Y is P-type and the junction is forward biased |
|
(c) X is P-type, Y is N-type and the junction is reverse biased |
|
(d) X is N-type, Y is P-type and the junction is reverse biased |
Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of
|
(a) A line at 5890 Å |
(b) A line at 5896 Å |
|
(c) Sodium doublet lines |
(d) No spectral features |
