Electrical JE MCQs (UPPCl JE, SSC JE, PGCIL DIPLOMA TRAINEE,UPMRC JE, NHPC JE )
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Which of the following materials has the least resistivity ?
Which of the following materials has the least resistivity ?
Zinc
Lead
Mercury
Copper ✅
ln the case of direct current ?
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
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is ?
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
For which of the following ampere second could be the unit ?
For which of the following ampere second could be the unit ?
Reluctance
Charge ✅
Power
Energy
An instrument which detects electric current is known as ?
An instrument which detects electric current is known as ?
voltmeter
rheostat
wattmeter
galvanometer ✅
A thermistor has ?
A thermistor has ?
positive temperature coefficient
negative temperature coefficient ✅
zero temperature coefficient
variable temperature coefficient
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is ?
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is ?
5 ohms✅
10 ohms
15 ohms
65 ohms
Ohm's law is not applicable to ?
Ohm's law is not applicable to ?
vacuum tubes ✅
carbon resistors
high voltage circuits
circuits with low current densities
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes ?
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes ?
0.4 ohm ✅
0.6 ohm
0.8 ohm
1.0 ohm
With rise in temperature the resistance of semi-conductors ?
The ratio of mass of proton to that of electron is nearly ?
