NCERT MCQ CLASS-12 CHAPTER-1 | PHYSICS NCERT MCQ | ELECTRIC CHARGES AND FIELDS | EDUGROWN

In This Post we are  providing Chapter-1 Electric Charges and Fields NCERT MCQ for Class 12 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON ELECTRIC CHARGES AND FIELDS

Question 1.
Which one of the following is the unit of electric field?
(a) Coulomb
(b) Newton
(c) Volt
(d) N/C

Answer: (d) N/C

Question 2.
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

Answer: (a) +3q

Question 3.
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

Answer: (a) always zero

Question 4.
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

Answer: (a) 6.25 × 10¹⁸

Question 5.
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

Answer: (a) W = ME (1 – cos θ)

Question 6.
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

Answer: (d) None

Question 7.
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

Answer: (d) is not necessarily zero

Question 8.
The dielectric constant of a metal is:
(a) 0
(b) 1
(c) ∞
(d) -1

Answer: (c) ∞

Question 9.
1 coulomb is equal to:
(a) 3 × 10⁹ e.s.u.
(b) 13 × 10⁹ e.s.u.
(c) 3 × 10¹⁰ e.s.u.
(d) 13 × 10¹⁰ e.s.u.

Answer: (a) 3 × 10⁹ e.s.u.

Question 10.
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) 116
(d) 16

Answer: (d) 16

Question 11.
Coulomb’s law in vector form can be written as
F⃗  = (14πεn) (q1q2r2)r⃗ 
where ε₀ is the permittivity 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

Answer: (c) N^-1m^-2C⁹

Question 12.
The dimensional representation of cu will be :
(a) [MLT⁴ A²]
(b) [M^-1L^-3T⁴A²]
(c)[ML^-2T ]
(d) None of these

Answer: (b) [M^-1L^-3T⁴A²]

Question 13.
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

Answer: (b) a torque

Question 14.
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

Answer: (d) not be affected practically

Question 15.
The SI units of electric dipole moment are:
(a) C
(b) Cm^-1
(c) Cm
(d) Nm^-1

Answer: (c) Cm

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