With the increase in principle quantum number, the energy difference between the two successive energy levels
|
(a) Increases |
|
(b) Decreases |
|
(c) Remains constant |
|
(d) Sometimes increases and sometimes decreases |
(b) Decreases
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Two protons A and B are placed in space between plates of a parallel plate capacitor charged upto V volts (See fig.) Forces on protons are 
and 
, then
|
(a) |
(b) |
(c) |
(d) Nothing can be said |
To demonstrate the phenomenon of interference, we require two sources which emit radiation
|
(a) Of the same frequency and having a define phase relationship |
|
(b) Of nearly the same frequency |
|
(c) Of the same frequency |
|
(d) Of different wavelengths |
The resistance and inductance of series circuit are 5
and 20H respectively. At the instant of closing the switch, the current is increasing at the rate 4A - s. The supply voltage is
|
(a) 20 V |
(b) 80 V |
(c) 120 V |
(d) 100 V |
The magnetic flux linked with coil, in weber is given by the equation, 
The induced emf in the coil in the fourth second is
|
(a) 10 V |
(b) 30 V |
(c) 45 V |
(d) 90 V |
Assertion : Two P-N junction diodes placed back to back, will work as a NPN transistor.
Reason : The P-region of two PN junction diodes back to back will form the base of NPN transistor.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius 
and 
respectively. The ratio of mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
