Electrostatics Class 12 MCQ: Class 12 Physics MCQ Questions and Answer. Students get here all Important MCQ on Electrostatics Class 12.
Electrostatics Class 12 MCQ with Answers:
Multiple choice questions
1.) Mathematical expression of Coulomb’s law.
a) F = k(q1q2/r2)
b) F = k((q1+q2)/r2)
c) F = k(r2/q1q2)
d) F= q1q2/r2
Ans : a) F = k(q1q2/r2)
2.) The value of k = 1/ 4πε0 is
a) 8.85×10-12 NM²C-2
b) 9.85×10-12 NM²C-2
c) 9×109 NM²C-2
d)8×10⁸ NM²C-2
Ans : c) 9×10⁹ NM²C-2
3.) Coulomb’s force in free space is
a) F = r2q1q2/4πε0
b) F = q1q2/4πε0r2
c) F = q12q2/4πε0r2
d) F = (1/4πε0)(q1q22/r2)
Ans : b) F = q1q2/ 4πε0r2
4.) Fill in the blank.
The force between two point charges is directly proportional to the product of the magnitude of changes and inversely proportional to the square of the ________ between them.
a) changes.
b) magnitudes
c)
d) distance
Ans : d) distance
5.) If q1 and q2 are equal and opposite changes then force exerted on q2 by q1 as F21 and that on change q1 due to q2 as F12 then
a) F12 = F21
b) F12 = -F21
c) F21 = -F12
d) F21 = F12
Ans : b) F12 = -F21
6.) The relation between electric field intensity E, force F and positive test charge q0 is
a) EF = q0
b) E = F / q0
c) q0 = E / F.
d) F = q0 / E
Ans : b) E = F / q0
7.) Electric field lines provides information about the electric force exerted on a charge, the lines are commonly called.
a) lines of force.
b) electric lines
c) Magnetic field lines.
d) electric force
Ans : a) lines of force
8.) Electric field lines originate from which charges.
a) Positive charge.
b) Neutral charges
c) Nagetive charges.
d) High nagetive charges
Ans : a) Positive charges.
9.) Electric field lines are end in which charges?
a) Positive charges.
b) Neutral charges
c) Nagetive charges.
d) High nagetive charges
Ans : c) Nagetive charges
10.) In the photocopy machine, the copying process is called
a) Xerography.
b) Yerography
c) Zerogras.
d) Layerography
Ans : a) Xerography
11.) In the photocopy machine, what is the name of the dry black powder
a) drayer.
b) blacker
c) toner.
d) copier
Ans : c) toner
12.) Fill in the blank.
The number of the field lines passing through a certain element of area is known as _______ through that area.
a) electric flux.
b) electric force
c) magnetic flux.
d) Magnetic force
Ans : a) electric flux
13.) Fill in the blank and complete the formula
The electric flux Φ0 = E ____
a) A.
b) cosθ
c) sinθ
d) F
Ans :a) A
14.) The value of the electric flux Φ0 = EA|| = ____
a) 0
b) 1
c) N.D
d) -1
Ans : a) 0
15.) Complete the formula that
Electric flux Φ0 = EA______
a) sinθ.
b) cosθ
c) tanθ.
d) secθ
Ans : b) cosθ
16.) Electric flux is a scalar quantity its SI unit is
a)Nm-2C-1
b)Nm²C-1
c) Nm-1C-2
d)Nm-2C²
Ans : b) Nm²C-1
17.) Complete the formula of electric flux through a surface enclosing a charge.
Φ0 = q /____
a)r2
b) E
c) A.
d) ε0
Ans : d) ε0
18.) Complete the statement of Gauss’s law
“The flux through any closed surface is ____ times the total charge enclosed in it “
a)ε0.
b) 1/ε0
c) Q.
d) Q/ ε0
Ans : b) 1/ ε0
19.) Complete the Gauss’s formula
Flux Φ0 = (1/ε0)× ______
a)Q.
b) A
c)1/Q.
d) E
Ans : a)Q
20.) What is the value of electric intensity of field inside a hollow charged sphere.
a) E= 1.
b)E= 0
c) E = ∞.
d) E = -1
Ans : b)E = 0
21.) Complete the formula of vector form of electric intensity due to an infinite sheet of charge.
E = (σ / 2ε0)×____
a) i+j+k
b) r̂
c) d
d) ê+i
Ans : b) r̂
22.) Complete the formula of electric intensity due to an infinite sheet of charge.
E = _____/ 2ε0
a) r̂.
b) A
c) σ.
d) 3
Ans : c) σ
23.) The formula of electric intensity between two oppositely charged parallel plates.
a)E = σ / ε0.
b) E =ε0 / σ
c) Eσ = ε0.
d) E / ε0= σ
Ans : a) E = σ / ε0
24.) Complete the formula
Charge in potential energy, ____= WAB
a)UA – UB
b)UB – UA
c)UAB – UBA
d)UBA – UAB
Ans : b)UB – UA
25.) Complete the formula
Electric potential difference, ∆V = ____
a)∆U/q0
b)∆U / ∆U0
c)∆q0/∆v.
d)∆V0 / ∆q0
Ans : a) ∆U / q0
26.) 1 Volt can be expressed as
a) joules / Coulomb.
b) joules / coulomb ²
c) coulomb / joules.
d) m²/ coulomb
Ans : a)joules / coulomb
27.) 1 Joule can be expressed as
a) Newton ²/metre.
b) Newton / metre
c) Newton / metre².
d) Newton² / metre²
Ans : b) Newton / metre
28.) 1Volt per metre can be expressed as
a) Newton Coulomb.
b) Coulomb / metre
c) Newton / Coulomb.
d) Newton / metre²
Ans : c) Newton / Coulomb
29.) Complete the formula
Electric field E = -∆V/ __
a)∆U.
b) ∆r
c) ∆q.
d) ∆q0
Ans : b) ∆r
30.) In general expression for electric potential Vr at a distance r from q is Vr = (1/4πε0)(__)
a)q²/r
b)q/r
c)q/r²
d)q/r²
Ans : b) q/r
31.) The value of 1eV is.
a)1.6×10-19 J.
b)6.625×10-34 J
c)1.6×10-19 Cm-2.
d)3.8×10-12 C
Ans : a) 1.6×10-19 J
32.) The gravitational force between the two point masses.
F= _______
a)G(m1+m2)/r².
b)Gm1m2/r²
c) G(m2-m1)/r².
d)G(m1 -m2)/r
Ans : b)Gm1m2/r²
33.) According to Stokes’s law the drag force F =_____
a)6πηrv.
b)6πσrv
c) 6πρrv.
d) 6πgrv
Ans : a) 6πηrv
34.) If Q be the magnetude of the charge V be the voltage and C be the capacitance then the relation between Q,V and C is
a) C=V/Q.
b)C=Q/V
c)Q=C/V.
d)C=QV
Ans : b) C= Q/V
35.) The SI unit of capacitance can be expressed as.
a) Coulomb/volt. b)Volt/Coulomb
c) Coulomb/metre. d)Volt/ metre
Ans : a) Coulomb/ volt
36.) Fill in the blank.
” The capacitance of a capacitor is ______ if a charge of one coulomb, given to one of the plates of parallel plate capacitor, produces a potential difference of one volt between them”
a) zero farad.
b) one Kelvin
c) one joules.
d) one farad
Ans : d) one farad
37.) If Q is the charge of the plate of area A then the surface density charge on the plate is σ ,then the relation between Q,A and σ.
a) σ = Q/A.
b) σ = A/Q
c) A = σ/Q.
d) Q = A /σ
Ans : a) σ = Q/A
38.) How does we show that dependence of a capacitor upon the area of plates, the separation between the plates and medium between them.
a) Cmed = A(ε0+εr)/d.
b) Cmed = A(ε0-εr)/d
c) Cmed = ε0εr/Ad.
d) Cmed = Aε0εr/d
Ans : d) Cmed = Aε0εr/d
39.) The dielectric constant εr can be expressed as
a) Cvac/Cmed
b) Cmed/Cvac
c) Cvac×Cmed
d) ε0/A
Ans : b) Cmed/Cvac
40.) Fill in the blank.
” The ____ of the capacitance of a parallel plate capacitor with an insulating substance as medium between the plates to its capacitance with vaccum (or air) as medium between them.
a) Sum.
b) product
c) difference.
d) ratio
Ans : d) ratio
41.) Which device is used to store charge or electric energy
a) Voltmeter.
b) ammeter
c) Capacitor.
d) Galvanometer
Ans : c ) Capacitor
42.) The relation between energy E, Capacitance C and potential difference V is
a) Energy = ½CV²
b) Energy = ½ CV
c) Energy = ½C²V
d) Energy = ½C²V²
Ans : a) Energy = ½CV²
43.) Energy density can be expressed as
a) Energy/ volume
b) Volume / Energy
c) Energy × Volume
d) Energy × Volume²
Ans: a)Energy / Volume
44.) The electric intensity between two oppositely charged parallel plate is E = ____
a) σ / ε0.
b)ε0 / σ
c) σ / q0
d) ε0/q0
Ans : a) σ / ε0
45.) The capacitance of a parallel plate capacitor is Cvac = ______
a)Aε0/d
b)Ad/ε0
c) ε0d/A
d)ε0/Ad
Ans : a) Aε0/d
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