MCQ Questions for Class 12 Physics Chapter 3 Current Electricity Part-1 with Answers

Current Electricity Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 3 Current Electricity Part-1 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-1 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-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Current Electricity Part-1 Class 12 Physics MCQ online test

Q1.	The speed at which tjie current travels in a conductor is nearly:
	A.3 × 10⁴ ms^-1
	B.3 × 10⁶ ms^-1
	C.3 × 10⁸ ms^-1
	D.3 × 10¹⁰ ms^-1

Ans: 3 × 10⁴ ms^-1

Q2.	The resistance of a human body is about:
	A.12 Ω
	B.120 Ω
	C.12 KΩ
	D.120 MΩ

Ans: 12 KΩ

Q3.	The number of electrons that constitute 1 A of current is:
	A.6.25 × 10¹⁶
	B.6.25 × 10¹⁷
	C.6.25 × 10¹⁸
	D.6.25 × 10¹⁹

Ans: 6.25 × 10¹⁸

Q4.	How many different resistances are possible with two equal resistors?
	A.2
	B.3
	C.4
	D.5

Ans: 3

Q5.	Given three equal resistors, how many different combinations (taken all of them together) can be made?
	A.3
	B.4
	C.5
	D.6

Ans: 4

Q6.	Specific resistance of ali metals is mostly affected by:
	A.temperature
	B.pressure
	C.magnetic field
	D.volume

Ans: temperature

Q7.	The example of a non-ohmic resistance is:
	A.copper wire
	B.fi lament lamp
	C.carbon resistor
	D.diode

Ans: diode

Q8.	If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be :
	A.L, 2A
	B.\(\frac{L}{2}\), 2A
	C.2L, 2A
	D.2l, \(\frac{A}{2}\)

Ans: \(\frac{L}{2}\), 2A

Q9.	The specific resistance of a rod of copper as compared to that of thin wire of copper is :
	A.less
	B.more
	C.same
	D.depends upon the length and area of cross-section of the wire

Ans: same

Q10.	A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
	A.\(\frac{2}{3}\) Ω
	B.\(\frac{3}{2}\) Ω
	C.\(\frac{1}{2}\) Ω
	D.\(\frac{1}{3}\) Ω

Ans: \(\frac{2}{3}\) Ω

Q11.	The length of a conductor is halved. Its resistance will be :
	A.halved
	B.doubled
	C.unchanged
	D.quadrupled

Ans: halved

Q12.	In the above question, the conductance:
	A.halved
	B.doubled
	C.unchanged
	D.quadrupled

Ans: doubled

Q13.	Siemen is the unit of:
	A.resistance
	B.conductance
	C.specific conductance
	D.None of these

Ans: conductance

Q14.	How much electric energy is consumed by a 100 W lamp used for 6 hours everyday for 30 days?
	A.18 kJ
	B.18 kWh
	C.1.8 J
	D.None of these

Ans: 18 kWh

Q15.	Suppose H₁ is the heat generated per second in the filament of a 100 W, 250 V lamp and H₂ is the heat generated in the filament of a 200 W, 250 V lamp. Then H₁/H₂ is equal to:
	A.1
	B.2
	C.\(\frac{1}{2}\)
	D.\(\frac{1}{4}\)

Ans: \(\frac{1}{2}\)

Q16.	Two wires of copper are of the same length but’have different diameters. When they are connected in series across a battery, the heat generated is H₁ When connected in parallel across the same battery, the heat generated during the same time is H₂ Then :
	A.H₁ = H₂
	B.H₁ < H₂
	C.H₁ > H₂
	D.H₁ > H₂

Ans: H₁ < H₂

Q17.	In questions 135, w hen the wires are connected in series, 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

Q18.	Kirchhoffs first and second laws for electrical circuits are consequences of:
	A.conservation of energy
	B.conservation of electrical charge and energy respectively
	C.conservation of electric charge
	D.neither conservation of energy nor electric charge

Ans: conservation of electrical charge and energy respectively

Q19.	A 5 A fuse wire can with stand a maximum power of 1 W in circuit. The resistance of the fuse wire is:
	A.0.2 Ω
	B.5 Ω
	C.0.4 Ω
	D.0.04 Ω

Ans: 0.04 Ω

Q20.	The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
	A.resistance will be doubled and specific resistance will be halved
	B.resistance will be halved and specific resistance will remain uncharged
	C.resistance will be halved and the specific resistance will be doubled
	D.resistance and specific resistance will both remain uncharged