in this article we are discussed about Electricity Heating & Chemical Effect .

**Light Reflation & Refraction Part 2 MCQ**

## Electricity Heating & Chemical Effect

**Q. When a charge q flows through a conductor in time t**, **then current I **is** given by the reaction:**

(A) I=t/q

(B) I=q/t**
**(C) I=qXt

(D) q=I+t

**Q. When 1 coulomb of charge flow through any section of a wire in 1 second**, the** current flowing through the wire is:**

(A) 1 ampere**
**(B) 1 volt

(C) 1 ohm

(D) 1 N/C

**Q. A current of 4 amperes flows through a conductor for 20 minutes. The charge which passes through the conductor is:**

(A) 80 coulombs

(B) 3200 coulombs

(C) 4800 coulombs**
**(D) 480 coulombs

**Q. Ohm law deals with the relation between:**

(A) charge and potential

(B) current and potential difference**
**(C) charge and resistance

(D) current and electric intensity

**Q. A current of 1 ampere flows through a wire when a potential difference of 1 volt is applied to it.The resistance of the wire is:**

(A) 1 ohm cm

(B) 1 watt

(C) 1 volt

(D) 1 ohm

**Q. An electric bulb in a train is drawing 0.4-ampere current at 20 volts.the resistance of the buld is:**

(A) 20Ω

(B) 50Ω**
**(C) 40Ω

(D) 8Ω

**Q. A current of 25 amperes is equivalent to:**

(A) 25 joule/sec

(B) 25 volt/sec

(C) 25 coulomb/sec**
**(D) 25 watt/sec

**Q. Three conductors of resistances r _{1},r_{2} and r_{3} are connected in series, the equivalent resistance R is given by the relation;**

(A) R=r_{1}+r_{2}+r_{3}** _{
}**(B) R=r

_{1}r

_{2}+r

_{2}r

_{3}+r

_{3}r

_{1 }(C) R=1/r

_{1}+1/r

_{2}+1/r

_{3 }(D) 1/R= 1/r

_{1}+1/r

_{2}+1/r

_{3}

**Q. Three resistances of 2, 3 and 6 ohms are connected in parallel the total resistance is:**

(A) 36Ω

(B) 11Ω

**(C) 1Ω
**(D) 7Ω

**Q. Two wires each resistance r ohms are joined in parallel.Their equivalent resistance will be:**

(A) 2r Ω

(B) r/2 Ω**
**(C) 2/r Ω

(D) zero Ω

**Q. Rate of doing work in an electric circuit is called:**

(A) power**
**(B) energy

(C) current

(D) voltage

**Q. Which of the following is the unit of electric power?**

(A) joule

(B) coulomb

(C) volt

(D) watt

**Q. The units of electric power (watts)electric current (ampere) and potential difference (volt)are connected by the relation:**

(A) ampere=volt x watt

(B) watt= volt x Ampere**
**(C) volt=watt x Ampere

(D) watt=volt+ampere

**Q. An electric bulb is marked 100watt, 200volts.The current through the bulb is:**

(A) 0.5 Ampere**
**(B) 5 ampere

(C) 2 ampere

(D) 10 ampere

**Q. A 100watt 220-volt bulb burns for 10 hours.The electrical energy(no.of units)consumed is equal to:**

(A) 0.5kWh

(B) 0.2kWh

(C) 1.0kWh**
**(D) 1.5kWh

**Q. When cells are arranged in parallel:**

(A) the current capacity increases**
**(B) the current capacity decreases

(C) the e.m.f.increases

(D) the e.m.f decreases

**Q. A resistor r1 dissipates the power p when connected to a certain generator.If a resistance r2 is put series with r1 the power dissipated by r1;**_{
}

(A) decreases**
**(B) increases

(C) remains the same

(D) any of the above depending upon the value of R1 and R2

**Q. Appliances based on the heating effect of current work on:**

(A) d.c only

(B) a.c only

(C) both a.c and d.c**
**(D) none of these

**Q. An a.c supply may be used directly for all these except for one.Identily the one for which cannot be used;**

(A) heating

(B) lighting

(C) transforming voltage

(D) electroplating

**Q. One volt is equal to;**

(A) 1 joule

(B) 1 newton/coulomb**
**(C) 1 joule/coulomb

(D) 1 newton/second

**Q. A piece of copper and germanium are cooled from room temperature to 80 k.The resistance of:**

(A) each of them increases

(B) each of them decreases

(C) copper increases and germanium decreases

(D) copper decreases and germanium increases

**Q. A current of 2A passing through a conductor produces 80j of heat in 10 seconds.The resistance of the conductor is:**

(A) 4 Ω

(B) 2 Ω**
**(C) 0.5 Ω

(D) 20 Ω

**Q. The current flowing through an electric bulb **rated** 200 volts 100 watts is:**

(A) 0.5 A**
**(B) 2 A

(C) 100 A

(D) 200 A

**Q. A current of 4.8 Amp.is flowing in a conductor.The number of electrons flowing per second through the conductor will be:**

(A) 3×10^{19}** ^{
}**(B) 76.8×10

^{20 }(C) 7.68×10

^{20 }(D) 3×10

^{20}

**Q. There 2-ohm resistors are connected to form a triangle.The resistance between any two corners is:**

(A) 6 Ω

(B) 2 Ω

(C) 3/4 Ω

(D) 4/3 Ω

**Q. Two electric bulbs have tungsten filament of the same length.If one of themgives 60 watts and the pther 100 watts,then:**

(A) 100 watt bulb has thicker filament**
**(B) 60 watt bulb has thicker filament

(C) both filament are of the same thicker

(D) it is impossible to get different wattage unless the lengths are different

**Q. The resistance of 20 cm long wire is 5 ohm.the wire is stretched to a uniform wire of 40 cm length.The resistance now will be (in ohms.)**

(A) 5 Ω

(B) 10 Ω

(C) 20 Ω**
**(D) 200 Ω

**Q. Two resistance are joined in parallel whose resultant is 6/5 ohm. Ohm of the resistance wire is broken and the effective resistance becomes 2 ohms.Then the resistance in ohm of the wire that got broken was:**

(A) 3/5Ω

(B) 2Ω

(C) 6/5Ω

(D) 3 Ω

**Q. A kilowatt-hour is a unit of:**

(A) energy**
**(B) power

(C) electric charge

(D) electric current

**Q. One-kilowatt hour equals:**

(A) 36×10^{5} joule**
**(B) 36×10

^{3 }(C) 10

^{3 }(D) 10

^{5}

**Q. Two heater wires of equal length are first connected in series and then in parallel.The ratio of the heat produced in the two cases is:**

(A) 2:1

(B) 1:2

(C) 4:1**
**(D) 1:4

**Q. Two electric bulbs is rated 220 volts and 100-watt power consumed by it when operated on 100 volts is:**

(A) 50 W

(B) 75 W

(C) 90 W

(D) 25 W

**Q. Two electric lamps of 40 watts each are connected in parallel.The power consumed by the combination will be:**

(A) 20 watt

(B) 60 watt

(C) 80 watt**
**(D) 100 watt

**Q. Voltmeter is an instrument used for:**

(A) potential measurement

(B) current measurement

(C) Electrolysis**
**(D) charge measurement

**Q. A strong battery is to be charged from a d.c supply.Which terminal of the battery be connected to the positive side of the line?**

(A) positive

(B) negative

(C) both positive and negative

(D) first negative and after the lapse of 5 minute positive

**Q. A cell of 40 ampere-hour capacity can supply a current of:**

(A) 40 ampere for one hour

(B) 1 ampere for 40 hours**
**(C) 1/2 ampere for 40 hours

(D) 20 ampere for two hours

**Q. The instrument which converts sound energy into electric energy is:**

(A) loudspeaker

(B) microphone**
**(C) transformer

(D) electric motor

**Q. Electrical energy is transmitted at high voltage to:**

(A) reduce losses**
**(B) convert power

(C) reduce length

(D) radius heat

**Q. The resistance of an ideal ammeter will be:**

(A) Zero

(B) infinity**
**(C) more then zero

(D) less then infinity

**Q. The galvanometer is converted to ammeter by:**

(A) using shunt of low resistance in parallel**
**(B) using coil

(C) using pipe

(D) using shunt in series

**Q. Which instrument has maximum resistance?**

(A) Ammeter

(B) voltmeter**
**(C) galvanometer

(D) voltaic cell

**Q. An electric bulb marked 60W used 5 hours a day.If it is used for 30 days then the electric units consumed 30 days would be:**

(A) 10

(B) 3

(C) 6

(D) 9

**Q. An electric fan marked 60-watt consumer 3 units for the duration:**

(A) 50 hours**
**(B) 150 hours

(C) 100 hours

(D) 15 hours

**Q. An electric bulb marked 100 W and 400V. During consumption the resistance of its filament would be:**

(A) 1500 ohm

(B) 1600 ohm**
**(C) 1000ohm

(D) 2000ohm

**Q. Electric bulbs marked 60W and 100V. During consumption the amount of electric current would be:**

(A) 0.6 Amp**
**(B) 6 Amp

(C) 1.6 Amp

(D) 0.06 Amp

**Q. The filament of the electric heater is made of:**

(A) nichrome mixed metal**
**(B) iron

(C) aluminium

(D) copper

**Q. An electric heater marked 550W is used for 8 hours a day. If the rate of electricity charge is Rs.0.20 per unit then total expenditure would be:**

(A) Rs.0.38

(B) Rs.7.70

(C) Rs. 0.88**
**(D) Rs.188.

**Q. Two electric bulbs marked 25W-120V and 100 W-120V are joined in series to the same source of 120V.Which electric bulb will yield more light.**

(A) 25W-120V**
**(B) 100W-120V

(C) both

(D) none of these

**Q. In a house six 100 watt electric bulbs are lighted for 4 hours daily.The electric energy consumption,is:**

(A) 240 kwh

(B) 24 kwh

(C) 2.4 kWh**
**(D) 0.24 kwh

**Q. An electric heater of 1.5 kW is used for 2 hours daily. The cost of energy consumed in a month or 30 days when the rate of energy is Rs.1.20 per unit is:**

(A) Rs.3.60

(B) Rs.10.80

(C) Rs.1080

(D) Rs.108.00

**Q. A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio R/R is:**

(A) 1/25

(B) 1/5

(C) 5

(D) 25

**Q. Which of the following terms not represent electric power in a circuit?**

(A) I^{2}R

(B) IR^{2}** ^{
}**(C) VR

(D) V

^{2}/R

**Q. An electric bulb is rated at 220 V and 100W. When it is operated on 110 V, the power consumed will be:**

(A) 100W

(B) 75W

(C) 50W

(D) 25W

**Q. Two conducting wires of the same material and of equal rights and equal diameter are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be:**

(A) 1:2

(B) 2:1

(C) 1:4**
**(D) 4:1

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