McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
Semiconductors have electron number density of order{{}} |
| A. | 10 24 m-3 |
| B. | 10 20 m-3 |
| C. | 10 12 m-3 |
| D. | 10 23 m-3 |
| Answer» D. 10 23 m-3 | |
| 2. |
A straight line symbol shows the |
| A. | fuse |
| B. | diode |
| C. | connecting lead |
| D. | switch |
| Answer» C. connecting lead | |
| 3. |
Rate of flow of electric charge is |
| A. | electric current |
| B. | conventional current only |
| C. | electronic current only |
| D. | potential difference |
| Answer» A. electric current | |
| 4. |
instrument which transfers energy to electric charges in a circuit is |
| A. | battery |
| B. | voltmeter |
| C. | ammeter |
| D. | galvanometer |
| Answer» A. battery | |
| 5. |
Electric power is related to |
| A. | current in component |
| B. | potential difference |
| C. | electrical resistance |
| D. | both A and B |
| Answer» D. both A and B | |
| 6. |
If a current of 1 A passes through a point in 1 s then charge passes that point is |
| A. | 2 C |
| B. | 3 C |
| C. | 1 C |
| D. | 6 C |
| Answer» C. 1 C | |
| 7. |
Energy transferred per unit charge is |
| A. | e.m.f |
| B. | current |
| C. | potential difference |
| D. | conventional current |
| Answer» C. potential difference | |
| 8. |
Current in a circuit when a charge of 180 C passes a point in a circuit in 2 minutes is |
| A. | 1:00 AM |
| B. | 2:00 AM |
| C. | 3:00 AM |
| D. | 1.5 A |
| Answer» D. 1.5 A | |
| 9. |
Electrons which are free to move around are also called |
| A. | conduction electrons |
| B. | valence shell electrons |
| C. | inner electrons |
| D. | electron sea |
| Answer» A. conduction electrons | |
| 10. |
Number of conduction electrons per unit volume is |
| A. | electron number |
| B. | number density |
| C. | proton number |
| D. | neutron number |
| Answer» B. number density | |
| 11. |
Current in a circuit if resistance of 15 Ω and potential difference of 3.0 V is applied across it's ends is |
| A. | 1 A |
| B. | 2 A |
| C. | 0.5 A |
| D. | 0.20 A |
| Answer» D. 0.20 A | |
| 12. |
Number density for copper is {{}} |
| A. | 10-29 m-3 |
| B. | 10 30 m-3 |
| C. | 10 29 m-3 |
| D. | 10 20 m-3 |
| Answer» C. 10 29 m-3 | |
| 13. |
Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10 -6 m2 carrying current of 1 A and having number density 8.5 × 10 28 m3 is {{}} |
| A. | 0.015 mm s-1 |
| B. | 0.1 mm s-1 |
| C. | 0.5 mm s-1 |
| D. | 0.25 mm s-1 |
| Answer» A. 0.015 mm s-1 | |
| 14. |
Magnitude of charge is known as |
| A. | charge count |
| B. | elementary charge |
| C. | elementary count |
| D. | charge number |
| Answer» B. elementary charge | |
| 15. |
1 Ω is equal to |
| A. | 1 V A-2 |
| B. | 1 V A-1 |
| C. | 1 V-1 A |
| D. | 2 V A-1 |
| Answer» B. 1 V A-1 | |
| 16. |
To protect wiring from excessive passing of current is |
| A. | voltmeter |
| B. | fuse |
| C. | galvanometer |
| D. | resistance |
| Answer» B. fuse | |
| 17. |
Current in a 60 W light bulb when it is connected to a 230 V power supply is |
| A. | 0.26 A |
| B. | 1.5 A |
| C. | 2.6 A |
| D. | 3.9 A |
| Answer» A. 0.26 A | |
| 18. |
Grid cables are 15 km long with a resistance of 0.20 Ω km-1, powers wasted as heat in these cables are |
| A. | 50 kW |
| B. | 60 kW |
| C. | 20 kW |
| D. | 30 kW |
| Answer» D. 30 kW | |
| 19. |
Actual velocity of electrons between collisions is |
| A. | 1030 m s-1 |
| B. | 1020 m s-1 |
| C. | 102 m s-1 |
| D. | 105 m s-1 |
| Answer» D. 105 m s-1 | |
| 20. |
By increasing the current, the drift velocity |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | becomes zero |
| Answer» B. increases | |
| 21. |
Current in a circuit depends on |
| A. | resistance |
| B. | potential difference |
| C. | both A and B |
| D. | e.m.f |
| Answer» C. both A and B | |
| 22. |
If direction of current is from positive to negative, then it is called |
| A. | electronic current |
| B. | conventional current only |
| C. | positronic current |
| D. | protonic current |
| Answer» B. conventional current only | |
| 23. |
A voltmeter arranged across the power supply measures |
| A. | potential difference |
| B. | e.m.f |
| C. | current |
| D. | resistance |
| Answer» B. e.m.f | |
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