| 1. | An instrument which detects electric current is known as ? | |
|
voltmeter
|
||
|
rheostat
|
||
|
wattmeter
|
||
|
galvanometer
|
||
View Answer
Discuss in Forum
Report Question| 2. | For which of the following ampere second could be the unit ? | |
|
Reluctance
|
||
|
Charge
|
||
|
Power
|
||
|
Energy
|
||
| 3. | The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is ? | |
|
zero
|
||
|
negative
|
||
|
positive
|
||
|
about 2 ohms per degree
|
||
| 4. | ln the case of direct current ? | |
|
magnitude and direction of current remains constant
|
||
|
magnitude and direction of current changes with time
|
||
|
magnitude of current changes with time
|
||
|
magnitude of current remains constant
|
||
| 5. | Which of the following materials has the least resistivity ? | |
|
Zinc
|
||
|
Lead
|
||
|
Mercury
|
||
|
Copper
|
||
| 6. | Which of the following material has nearly zero temperature co-efficient of resistance ? | |
|
Manganin
|
||
|
Porcelain
|
||
|
Carbon
|
||
|
Copper
|
||
| 7. | Nichrome wire is an alloy of ? | |
|
lead and zinc
|
||
|
chromium and vanadium
|
||
|
nickel and chromium
|
||
|
copper and silver
|
||
| 8. | A glass rod when rubbed with silk cloth is charged because ? | |
|
it takes in proton
|
||
|
its atoms are removed
|
||
|
it gives away electrons
|
||
|
it gives away positive charge
|
||
| 9. | The insulation on a current carrying conductor is provided ? | |
|
to prevent leakage of current
|
||
|
to prevent shock
|
||
|
both of above factors
|
||
|
none of above factors
|
||
| 10. | A closed switch has a resistance of ? | |
|
zero
|
||
|
about 50 ohms
|
||
|
about 500 ohms
|
||
|
infinity
|
||