1 |
Reverse current flows due to |
Majority charge carriers
Minority charge carriers
Electrons
Holes
|
2 |
The potential difference across the depletion region of germanium is. |
0.3 V
0.5 V
0.7 V
0.8 V
|
3 |
The potential barrier for silicon is. |
0.7 V
0.5 V
0.3 V
0.9 V
|
4 |
Domains are existed in |
Ferromagnetic materials
Paramagnetic materials
Semi conductors
Diamagnetic materials
|
5 |
Which of the following has least hysteresis loop area. |
Steel
Wrought Iron
Soft Iron
Cobalt
|
6 |
Very weak magnetic field produced by brain can be detected by |
MRI
CAT scans
Squid
CRO
|
7 |
The most suitable metal for making permanent magnet is. |
Iron
Aluminium
Steel
Copper
|
8 |
A solid having regular arrangement of molecules throughout its structure is called. |
Amorphous solid
Polymeric solid
Crystalline solid
Glassy solid
|
9 |
Soft magnetic material is |
Sodium
Steel
Iron
Copper
|
10 |
The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called. |
Ferromagnetic
Paramagnetic
Diamagnetic
Non magnetic
|
11 |
After curie temperature. |
Ferromagnetic
Paramagnetic
Magnetic
Diamagnetic
|
12 |
In extrinsic semiconductors doping is of the order of. |
1 atom to 10<sup>4</sup>
1 atom to 10<sup>6</sup>
1 atom to 10<sup>8</sup>
1 atom to 10<sup>3</sup>
|
13 |
The critical temperature of mercury is. |
1.18 K
4.2 K
3.72 K
7.2 K
|
14 |
The critical temperature of Aluminum is. |
3.72 K
1.18 K
7.2 K
8.2 K
|
15 |
Minority carriers in P-Types , substances are. |
Electrons
Protons
Holes
Neutrons
|
16 |
A material which is insulator at 0 K and conduct at room temperature is. |
Silver
Lead
Germanium
Polythene
|
17 |
Which one pair belongs to acceptor impurity. |
Aresincl, phosphorus
Boron, gallium
Arsenic, antimony
Antimony, indium
|