- ACoulomb.
- BC.
- CBoth a and b.
- DA.
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Zener breakdown in a semi-conductor diode occurs when
|
(a) Forward current exceeds certain value |
(b) Reverse bias exceeds certain value |
|
(c) Forward bias exceeds certain value |
(d) Potential barrier is reduced to zero |
The mass of a photo electron is
|
(a) 9.1 |
(b) 9.1 |
(c) 9.1 |
(d) 9.1 |

The ionisation energy of 10 times ionised sodium atom is
|
(a) 13.6 eV |
(b) 13.6 × 11 eV |
(c) |
(d) 13.6 × (11)2 eV |
A convex lens has 9 cm focal length and a concave lens has – 18 cm focal length. The focal length of the combination in contact will be
|
(a) 9 cm |
(b) – 18 cm |
(c) – 9 cm |
(d) 18 cm |
The grid voltage of any triode valve is changed from –1 volt to – 3 volt and the mutual conductance is 3
mho. The change in plate circuit current will be
|
(a) 0.8 mA |
(b) 0.6 mA |
(c) 0.4 mA |
(d) 1 mA |