| 1 |
The heat produced by passage of current. |
- A. H=I<sup>2</sup>Rt
- B. H=IR2T
- C. H=I/Rt
- D. H=I<sup>2</sup>/Rt
|
| 2 |
A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be: |
- A. Doubled
- B. Halved
- C. Remain the same
- D. One fourth
|
| 3 |
Heat energy is converted into electrical energy. |
- A. Solar cells
- B. thermocouples
- C. Electric generators
- D. None of above
|
| 4 |
Two resistance of 2 Ohm each are connected in parallel combination equivalent resistance will be. |
- A. 4 Ohm
- B. 2 Ohm
- C. 1 Ohm
- D. 8 Ohm
|
| 5 |
A substance having the negative temperature co efficient of resistivity out of the following is. |
- A. Carbon
- B. Iron
- C. Tungsten
- D. Gold
|
| 6 |
The current flowing through each resistor of equal resistance in parallel combination is. |
- A. Same
- B. Different
- C. Zero
- D. Infinite
|
| 7 |
Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is: |
- A. 3Ω
- B. 4Ω
- C. 4.5Ω
- D. 5Ω
|
| 8 |
The thermistors convert changes of temperature into. |
- A. Light energy
- B. Electric voltage
- C. Heat
- D. Sound
|
| 9 |
The unit of temperature co efficient of resistivity is. |
- A. Ohm -m
- B. K-1
- C. K
- D. Ohm
|
| 10 |
the current which flows from a point at higher. potential to point at lower potential is called. |
- A. Electric current
- B. Conventional current
- C. Either of these
- D. None of above
|
