MCQ
An energy source will supply a constant current into the load if its internal resistance is:
- 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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A proton of energy 200 MeV enters the magnetic field of 5 T. If direction of field is from south to north and motion is upward, the force acting on it will be
|
(a) Zero |
(b) 1.6 |
(c) 3.2 |
(d) 1.6 |
In a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength l'. The value of l' is
|
(a) 4400 Å |
(b) 6600 Å |
(c) 2000 Å |
(d) 3500 Å |

Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is
|
(a) 1: 3 |
(b) 27 : 5 |
(c) 5 : 27 |
(d) 4 : 9 |