120 Important Basic Electrical MCQ Question and Answer | PDF Free Download
1.Conductance is reciprocal of
- AResistance
- BInductance
- CReluctance
- DCapacitance
2.The resistance of a conductor caries inversely as
- ALength
- BArea of cross-section
- CTemperature
- DResistivity
3.With rise in temperature the resistance of pure metals
- AIncreases
- BDecrease
- CFirst increases and then decreases
- DRemains constant
4.With in temperature the resistance of semi-conductors
- ADecreases
- BIncreases
- CFirst increases and then decreases
- DRemain constant
5.Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is
- A5 ohms
- B10 ohms
- C15 ohms
- D55 ohms
6.The resistance of two wires is 25 ohm when connected in series and 6 ohm when joined in parallel. The resistance of each wire is
- A10 ohm, 15 ohm
- B20 ohm, 30 ohm
- C5 ohm, 10 ohm
- D10 ohm, 20 ohm
7.An instrument which detects electric current in known as
- AVoltmeter
- BRheostat
- CWattmeter
- DGalvanometer
8.In a circuit a 33 ohm resistor carries a current of 2 A. the voltage across the resistor is
- A33 V
- B66 V
- C80 V
- D132 V
9.A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
- A400 ohms
- B600 ohms
- C800 ohms
- D1000 ohms
10.The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
- A18 ohms
- B36 ohms
- C48 ohms
- D64 ohms
11.Which of the following material has nearly zero temperature co-efficient of resistance?
- AManganin
- BPorcelain
- CCarbon
- DCopper
12.You have to replace 1500 ohm resistor in radio. You have no 1500 ohm resistor but have several 1000 ohm ones which you would connect
- ATwo in parallel
- BTwo in parallel and one in series
- CThree in parallel
- DThree in series
13.Which of the following statement is true both for a series and a parallel DC circuit?
- AElements have individual currents
- BCurrents are additive
- CVoltages are additive
- DPower are additive
14.Which of the following material has a negative temperature co-efficient of resistance?
- ACopper
- BAluminum
- CCarbon
- DBrass
15.OHM's law is not applicable to
- AVacuum tubes
- BCarbon resistors
- CHigh voltage circuits
- DCircuits with low current densities
16.Which is the best conductor of electricity?
- AIron
- BSilver
- CCopper
- DCarbon
17.For which of the following ?ampere second? could be the unit?
- AReluctance
- BCharge
- CPower
- DEnergy
18.Which of the following does not have negative temperature co-efficient?
- AAluminum
- BPaper
- CRubber
- DMica
19.Varistors are
- AInsulators
- BNon-linear resistors
- CCarbon resistors
- DResistors with zero temperature co-efficient
20.Insulating materials have the function of
- APreventing a short circuit between conducting wires
- BPreventing an open circuit between the voltage source and the load
- CConducting very large currents
- DStoring very high currents