| 1. | A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly ? | |
|
1023
|
||
|
1018
|
||
|
1020
|
||
|
1016
|
||
View Answer
Discuss in Forum
Report Question| 2. | How many joules of electrical energy are transferred per second by a 6 V; 0.5 A Lamp ? | |
|
0.83 J/s
|
||
|
30 J/s
|
||
|
3 J/s
|
||
|
12 J/s
|
||
| 3. | The free electrons of a metal ? | |
|
Are free to escape through the surface
|
||
|
Do not collide with each other
|
||
|
Are free to move anywhere in the metal
|
||
|
Do not collide with each other
|
||
| 4. | The current in a wire ? | |
|
Does not depend on resistance and potential difference
|
||
|
Depends only on the resistance of the wire
|
||
|
Depends on both resistance and potential difference
|
||
|
Depends only on the potential difference applied
|
||
| 5. | When there is an electric current passing through a wire, the particles moving are ? | |
|
Ions
|
||
|
Electrons
|
||
|
Atoms
|
||
|
Protons
|
||
| 6. | What is the maximum resistance which can be made using five resistors each of 1/5 W ? | |
|
10 ohm
|
||
|
1 ohm
|
||
|
5 ohm
|
||
|
1/5 ohm
|
||
| 7. | A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is true ? | |
|
R2 > R3 > R1
|
||
|
R3 > R2 > R1
|
||
|
R1 > R2 > R3
|
||
|
R1 = R2 = R3
|
||
| 8. | The resistivity does not change if ? | |
|
the temperature is changed
|
||
|
both material and temperature are changed
|
||
|
the material is changed
|
||
|
the shape of the resistor is changed
|
||
| 9. | A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross-section ? | |
|
2A
|
||
|
3A
|
||
|
3A/2
|
||
|
A/2
|
||
| 10. | What is the maximum resistance which can be made using five resistors each of 1/5 ohm ? | |
|
1 ohm
|
||
|
5 ohm
|
||
|
10 ohm
|
||
|
1/5 ohm
|
||