MCQ Questions for Class 12 Physics Chapter 3 Current Electricity Part-3 with Answers

Current Electricity Part-3 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 3 Current Electricity Part-3 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Current Electricity Part-3 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 3 Quiz

Class 12 Physics Chapter 3 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity Part-3 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Current Electricity Part-3 Class 12 Physics MCQ online test

Q1.	In following figure shows currents in a part of electrical circuit, then the value of/(in ampere) is given by :
	A.0.3 A
	B.0.5 A
	C.1.3 A
	D.None of these

Ans: 0.3 A

Q2.	The smallest resistance that can be obtained by the combination of n resistors each resistance r is :
	A.\(\frac{r}{n}\)
	B.nr
	C.\(\frac{n}{r}\)
	D.n²r

Ans: \(\frac{r}{n}\)

Q3.	Which of the following has a negative temperature coefficient of resistance ?
	A.Tungsten
	B.Carbon
	C.Nichrome
	D.Platinum

Ans: Carbon

Q4.	An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed Will be:
	A.500 W
	B.750 W
	C.1000 W
	D.1125 W

Ans: 750 W

Q5.	A uniform w ire connected across a supply produces heat H per second. If wire is cut into three equal parts and all the parts are connected in parallel across the same supply, the heat produced per second will be :
	A.\(\frac{H}{9}\)
	B.9 H
	C.3 H
	D.\(\frac{H}{3}\)

Ans: \(\frac{H}{3}\)

Q6.	In India electricity is supplied fordomestic use at 220 V. It is supplied at 110 V in U.S.A. If the resistance of a 60 W bulb use in India is R. the resistance of a 60 W bulb for use in USA will be:
	A.2 R
	B.R
	C.R/2
	D.R/4

Ans: R/4

Q7.	In the following figure represents a balanced Wheatstone bridge circuit. What is the value of X ?
	A.15 Ω
	B.20 Ω
	C.25 Ω
	D.30 Ω

Ans: 25 Ω

Q8.	Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?
	A.25 W
	B.100 W
	C.both bulbs have equal resistance
	D.resistance of bulbs can not be compared

Ans: 25 W

Q9.	Potentiometer measures the potential difference more accurately than a voltmeter because:
	A.It has a wire of high resistance
	B.It has a wire of low resistance
	C.It does not draw current from external circuit
	D.It draws heavy current from external circuit

Ans: It does not draw current from external circuit

Q10.	In a Wheatstone bridge, the resistance each arm is 10 Ω. If the resistance galvanometers is also 10 Ω, then effective resistance of the bridge will be :
	A.40 Ω
	B.20 Ω
	C.10 Ω
	D.5 Ω

Ans: 10 Ω

Q11.	The resistance of an aluminium wire is/i. It is stretched to /i times its original length. Its new resistance will be :
	A.nr
	B.n²r
	C.\(\frac{n^2}{r}\)
	D.\(\frac{r}{n^2}\)

Ans: n²r

Q12.	A wire P is half the diameter and half the length of a wire Q of similar material. The ratio of resistances of P to that 0 is:
	A.4 : 1
	B.8 : 1
	C.2 : 1
	D.1 : 2

Ans: 2 : 1

Q13.	What is the resistance across A and B in the network in Fig.?
	A.R
	B.2 R
	C.\(\frac{R}{2}\)
	D.6 R

Ans: R

Q14.	When the wires are connected in parallel, the heat produced in the thinner wire is H₁ and that in the thicker wire is H₂ Then:
	A.H₁ = H₂
	B.H₁ < H₂
	C.H₁ > H₂
	D.H₁ ≥ H₂

Ans: H₁ < H₂

Q15.	Two equal resistors are connected in series across a battery and consume a power of P. If these are connected in parallel, then the’ power consumed will be:
	A.2P
	B.4P
	C.\(\frac{p}{4}\)
	D.P