MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Fields Part-1 with Answers

Electric Charges and Fields Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Fields 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 Electric Charges and Fields Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 1 Quiz

Class 12 Physics Chapter 1 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges and Fields Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Electric Charges and Fields Part-1 Class 12 Physics MCQ online test

Q1.	Which one of the following is the unit of electric field?
	A.Coulomb
	B.Newton
	C.Volt
	D.N/C

Ans: N/C

Q2.	Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
	A.+3q
	B.+2q
	C.-3q
	D.-4q

Ans: +3q

Q3.	If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
	A.always zero
	B.never zero
	C.depend upon capacity of dipole
	D.None

Ans: always zero

Q4.	The number of electron-taken out from a body to produce 1 coulomb of charge will be :
	A.6.25 × 10¹⁸
	B.625 × 10¹⁸
	C.6.023 × 10²³
	D.None

Ans: 6.25 × 10¹⁸

Q5.	The work done in rotating an electric dipole in an electric field:
	A.W = ME (1 – cos θ)
	B.W = ME tan θ
	C.W = ME sec θ
	D.None

Ans: W = ME (1 – cos θ)

Q6.	If sphere of bad conductor is given charge then it is distributed on:
	A.surface
	B.inside the surface
	C.only inside the surface
	D.None

Ans: None

Q7.	Electric field in a cavity of metal:
	A.depends upon the surroundings
	B.depends upon the size of cavity
	C.is always zero
	D.is not necessarily zero

Ans: is not necessarily zero

Q8.	The dielectric constant of a metal is:
	A.0
	B.1
	C.∞
	D.-1

Ans: ∞

Q9.	1 coulomb is equal to:
	A.3 × 10⁹ e.s.u.
	B.\(\frac{1}{3}\) × 10⁹ e.s.u.
	C.3 × 10¹⁰ e.s.u.
	D.\(\frac{1}{3}\) × 10¹⁰ e.s.u.

Ans: 3 × 10⁹ e.s.u.

Q10.	Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
	A.1
	B.4
	C.\(\frac{1}{16}\)
	D.16

Ans: 16

Q11.	Coulomb’s law in vector form can be written as \(\vec{F} \) = (\(\frac{1}{4πε_n}\)) (\(\frac{q_1q_2}{r^2}\))\(\vec{r} \) where ε₀ is the permitivity of free space. The SI units of ε₀ will be:
	A.N^-1m^-2C^-2
	B.Nm^-2C²
	C.N^-1m^-2C⁹.
	D.Nm^-2C²

Ans: N^-1m^-2C⁹

Q12.	The dimensional representation of cu will be :
	A.[MLT⁴ A²]
	B.[M^-1L^-3T⁴A²]
	C.[ML^-2T ]
	D.None of these

Ans: [M^-1L^-3T⁴A²]

Q13.	When placed in a uniform field, a dipole experiences:
	A.a net force
	B.a torque
	C.both a net force and torque
	D.neither a net force nor a torque

Ans: a torque

Q14.	A parrot comes and sits on a bare high power line. It will:
	A.experience a mild shock ‘
	B.experience a strong shock.
	C.get killed instantaneously
	D.not be affected practically

Ans: not be affected practically

Q15.	The SI units of electric dipole moment are:
	A.C
	B.Cm^-1
	C.Cm
	D.Nm^-1

Ans: Cm

Q16.	If two conducting sphere are connected after charging separately then:
	A.Electrostatic energy sphere energy will remain conserved
	B.Electrostatic energy charges remains conserved
	C.Electrostatic energy energy and charge remains conserved
	D.None

Ans: Electrostatic energy charges remains conserved

Q17.	A soap bubble is given a negative charge, then its radius:
	A.increases
	B.decreases
	C.remains unchanged
	D.may increase or decrease

Ans: increases

Q18.	In non-uniform electric field, electric dipole experiences:
	A.torque only
	B.torque as well as net force
	C.force only
	D.None of these

Ans: torque as well as net force

Q19.	An electron is sent in an electric field of magnitude 9.1 × 10⁶NC^-1. The acceleration produced in it is :
	A.1.6 ms^-2
	B.1.6 × 10¹⁸ms^-2
	C.3.2 × 10¹⁸ms^-2
	D.0.8 × 10¹⁸ ms^-2

Ans: 1.6 × 10¹⁸ms^-2

Q20.	A semicircular arc of radius r is charged uniformly and the charge per unit length is λ. The electric field at the centre is:
	A.\(\frac{λ}{2λε_0r^2}\)
	B.\(\frac{λ}{4πε_0r}\)
	C.\(\frac{λ^2}{2πε_0r}\)
	D.\(\frac{λ}{2πε_0r}\)