120 Important Basic Electrical MCQ Question and Answer | PDF Free Download
1.The draft velocity of the electron is
- AVery small as compared to speed of light
- BEqual to speed of light
- CAlmost equal to speed of light
- DGreater than speed of light
2.In gases, the flow of current is due to
- AElectrons only
- BPositive ions only
- CElectrons and positive ions
- DElectrons, positive ions, negative ions
3.Two resistor are said to be connected in series when
- ASame current passes in turn through both
- B Both carry the same value of current
- CTotal current equals to the sum of branch current
- D Sum of IR drops equals to the applied e.m.f
4.A resistance having rating 10 ohms, 10 W is likely to be a
- AMetallic resistor
- BCarbon resistor
- CWire wound resistor
- DVariable resistor
5.The minimum charge on an ion is
- AEqual to the atomic number of an atom
- BEqual to the charge of an electron
- CEqual to the charge of number of electron in an atom
- DZero
6.A 3 ohm resistor having 2A current will dissipate the power of
- A2 watts
- B4 watts
- C6 watts
- D8 watts
7.Which of the following statement is true?
- AA galvanometer with low resistance in parallel is a voltmeter
- BA galvanometer with high resistance in parallel is a voltmeter
- CA galvanometer with low resistance in series is an ammeter
- DA galvanometer with high resistance in series is an ammeter
8.The resistance of a few meters of wire conductor in closed electrical circuit is
- APractically zero
- BLow
- CHigh
- DVery High
9.A 500 W, 220 V bulb is supplied with 110V. power consumption by the bulb will be
- ASlightly less than 125 W
- BSlightly greater than 125 W
- CExactly 125 W
- D250 W
10.In an electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 min, using the same supply mains
- ALength of heating elements should be decreased
- BLength of heating element should be increased
- CLength of heating element has no effect on heating of water
- DNone of the above
11.Resistance of a material always decrease if
- ATemperature of material is decreased
- BTemperature of material is increased
- CNumber of free electros available becomes more
- DNone of the above is correct
12.When electric current passes through a metallic conductor, its temperature rises. This is due to
- ACollisions between conduction electrons and atoms
- BThe release of conduction electrons from the parent atom
- CMutual collision between metal atom
- DMutual collision between conducting electron
13.A glass rod when rubbed with silk cloth is charged because
- AIt takes in proton
- BIts atoms are removed
- CIt gives away electrons
- DIt gives away positive charge
14.It becomes more difficult to remove
- AAny electrons from the orbit
- BFirst electrons from the orbit
- CSecond electron from the orbit
- DThird electron from the orbit
15.When the leg of parallel circuit is opened out, the total current will be
- AReduce
- BIncrease
- CDecrease
- DBecome zero
16.Resistance of carbon filament lamp ?? as the applied voltage increases.
- AIncreases
- BDecreases
- CRemain same
- DNone of above
17.For testing appliances, the wattage of test lamp should be
- Avery low
- Blow
- Chigh
- Dany value
18.A field of force can be exist between
- ATwo molecule
- BTwo ions
- CTwo atoms
- DTwo metal particles
19.A substance whose molecules consists dissimilar atom is called
- ASemi-conductor
- BSuper-conductor
- CCompound
- DInsulator
20.Three identical resistors are first connected in parallel and then in series. The resultant resistance in first combination to the second will be
- A9 times
- B1/9 times
- C1/3 times
- D3 times