- Aisomer
- ✓isotone
- Cisobar
- Disotope
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Figure shows the ray diagram of a:

The resistance of the series combination of two resistance is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is
|
(a) 4 |
(b) 3 |
(c) 2 |
(d) 1 |
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
An electric bulb is rated 60W, 220V. The resistance of its filament is
|
(a) 708 W |
(b) 870 W |
(c) 807 W |
(d) 780 W |
The curve between the activity A of a radioactive sample and the number of active atoms N is
|
(a)
|
(b)
|
(c)
|
(d)
|

For germanium crystal, the forbidden energy gap in joules is
|
(a) 1.12 |
(b) 1.76 |
(c) 1.6 |
(d) Zero |