McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
Resistivity of lead is {{}} |
| A. | 22.5 × 10 -8 Ω m |
| B. | 20.8 × 10 -8 Ω m |
| C. | 10 Ω m |
| D. | 5 Ω m |
| Answer» B. 20.8 × 10 -8 Ω m | |
| 2. |
A filament lamp is |
| A. | Ohmic |
| B. | non-Ohmic |
| C. | low resistive |
| D. | non glowing |
| Answer» B. non-Ohmic | |
| 3. |
In case of filament lamp at higher voltages, the resistance of lamp |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | varies depending on the filament |
| Answer» B. increases | |
| 4. |
If the connections across the resistor are reversed, then graph between current and potential difference is |
| A. | variable |
| B. | straight lined |
| C. | constant |
| D. | inverted |
| Answer» B. straight lined | |
| 5. |
In semiconductors upon increasing temperature, conductivity |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | haphazard |
| Answer» B. increases | |
| 6. |
In NTC thermistor on increasing temperature, the resistance |
| A. | increases |
| B. | remains constant |
| C. | decreases |
| D. | behaves abruptly |
| Answer» C. decreases | |
| 7. |
A component that allows unidirectional current to pass through it is |
| A. | resistor |
| B. | inductor |
| C. | transformer |
| D. | diode |
| Answer» D. diode | |
| 8. |
A rectifier converts |
| A. | DC to AC |
| B. | AC to DC |
| C. | voltage in to current |
| D. | current in to voltage |
| Answer» B. AC to DC | |
| 9. |
Threshold voltage at which LED emits light is |
| A. | less than 0.6 |
| B. | equal to 0.6 |
| C. | more than 0.6 |
| D. | more than 3 |
| Answer» C. more than 0.6 | |
| 10. |
Resistivity is measured in |
| A. | ohms |
| B. | ohm per meter |
| C. | ohm meter |
| D. | ohm sq. meter |
| Answer» C. ohm meter | |
| 11. |
Component which obeys ohm's law is called |
| A. | resistive component |
| B. | efficient component |
| C. | Ohmic component |
| D. | non-Ohmic component |
| Answer» C. Ohmic component | |
| 12. |
At constant temperature, resistance and cross-sectional area are |
| A. | directly related |
| B. | not related |
| C. | remains constant |
| D. | inversely related |
| Answer» D. inversely related | |
| 13. |
Current and voltage are |
| A. | directly related |
| B. | inversely related |
| C. | not related |
| D. | gives abnormal behavior on graph |
| Answer» A. directly related | |
| 14. |
At threshold voltage, resistance of diode |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | varies depending on the direction of voltage |
| Answer» A. decreases | |
| 15. |
Resistance of a particular wire depends upon |
| A. | size and shape |
| B. | shape and length only |
| C. | size only |
| D. | shape only |
| Answer» A. size and shape | |
| 16. |
Resistance of metal is affected by |
| A. | presence of impurities |
| B. | temperature |
| C. | both A and B |
| D. | pressure |
| Answer» C. both A and B | |
| 17. |
If current and potential difference are directly related then object follows |
| A. | Ohm's law |
| B. | Faraday's law |
| C. | Ampere's law |
| D. | Kirchhoff's law |
| Answer» A. Ohm's law | |
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