| 1 |
Conductors have conductivities of order: |
- A. 10<sup>3</sup>(Ωm)-1
- B. 10<sup>7</sup>(Ωm)<sup>-1</sup>
- C. 10<sup>7</sup>Ωm<sup>-1</sup>
- D. 10<sup>-6</sup>Ω
|
| 2 |
In extrinsic semiconductors doping is of the order of. |
- A. 1 atom to 10<sup>4</sup>
- B. 1 atom to 10<sup>6</sup>
- C. 1 atom to 10<sup>8</sup>
- D. 1 atom to 10<sup>3</sup>
|
| 3 |
Very weak magnetic field produced by brain can be detected by |
- A. MRI
- B. CAT scans
- C. Squid
- D. CRO
|
| 4 |
Which one of the following is polymeric solids |
- A. Glass
- B. Nylon
- C. Copper
- D. Zinc
|
| 5 |
The dimension of stress is |
- A. [MLT<sup>-1</sup>]
- B. [ML<sup>-1</sup>T]
- C. [ML<sup>-1</sup>T<sup>-1</sup>]
- D. [ML<sup>-1</sup>T<sup>-2</sup>]
|
| 6 |
The ability of a body to return to its original shape is called. |
- A. Strain
- B. Stress
- C. Elasticity
- D. Plasticity
|
| 7 |
A material which is insulator at 0 K and conduct at room temperature is. |
- A. Silver
- B. Lead
- C. Germanium
- D. Polythene
|
| 8 |
Which one pair belongs to acceptor impurity. |
- A. Aresincl, phosphorus
- B. Boron, gallium
- C. Arsenic, antimony
- D. Antimony, indium
|
| 9 |
The SI unit of stress is same as that of. |
- A. Pressure
- B. Force
- C. Momentum
- D. Work
|
| 10 |
substance which undergo plastic deformation until they break are known as. |
- A. Brittle substances
- B. Ductile substance
- C. Non magnetic substance
- D. Magnetic substance
|