NEET Physics Electric Flux and Gausss MCQs

Question: The Gaussian surface
a) can pass through a continuous charge distribution
b) can pass through any system of discrete charges
c) cannot pass through a continuous charge distribution
d) can pass through a continuous charge distribution as well as any system of discrete charges.
Answer: can pass through a continuous charge distribution

Question: Gauss's law is valid for
a) any closed surface
b) only regular close surfaces
c) any open surface
d) only irregular open surfaces
Answer: any closed surface

Question:

a)

b)

c)

d)

Answer:

Question:

a) the total flux through the surface is zero
b) E is perpendicular to the surface at every point
c) the flux is only going out of the surface
d) E is necessarily zero on the surface
Answer: the total flux through the surface is zero

Question: The electric field inside a spherical shell of uniform surface charge density is
a) zero
b) constant different from zero
c) proportional to the distance from the curve
d) None of the above
Answer:  zero

Question:

a) decreases
b) increases
c) becomes zero
d) remains same
Answer: decreases

Question:  A charge q is placed at the centre of the open end of a cylindrical vessel. The flux of the electric field through the surface of the vessel is

a) zero
b)

c)

d)

Answer:  zero

 More Questions..................................... 

Question:

a)

b)

c)

d)

Answer:

Question: A cylinder of radius R and length l is placed in a uniform electric field E parallel to the axis of the cylinder. The total flux over the curved surface of the cylinder is

a) zero

b)

c)

d)

Answer:  zero

Question:  At the centre of a cubical box + Q charge is placed. The value of total flux that is coming out a wall is

a)

b)

c)

d)

Answer:

Question: An electric dipole is put in north-south direction in a sphere filled with water. Which statement is correct?
a) Electric flux entering into sphere and leaving the sphere are same
b) Water does not permit electric flux to enter into sphere
c) Electric flux is coming out of sphere
d) Electric flux is coming towards sphere
Answer:  Electric flux entering into sphere and leaving the sphere are same

Question:

a)

b)

c)

d)

Answer:

Question: A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
a) remain the same
b) increase four times
c) be reduced to half
d) be doubled
Answer:  remain the same

Question:  A charge +q is at a distance L/2 above a square of side L. Then what is the flux linked with the surface?
a)

b)

c)

d)

Answer:

Question:  A point charge is kept at the centre of metallic insulated spherical shell. Then
a) net induced charge on the sphere is zero
b) electric potential inside the sphere is zero
c) electric field inside the sphere is zero
d) electric field out side the sphere is zero
Answer:  net induced charge on the sphere is zero

Question: Positive electric flux indicates that electric lines of force are directed
a) outwards
b) inwards
c) Both
d) None of these
Answer:  outwards

Question:  A point charge +Q is positioned at the center of the base of a square pyramid as shown. The flux through one of the four identical upper faces of the pyramid is

a)

b)

c)

d) None of these

Answer:

Question: Electric flux over a surface in an electric field may be
a) All of these
b) negative
c) positive
d) zero
Answer: All of these

Question:

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question: Electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 1 m surrounding the total charge is 100 V-m. The flux over the concentric sphere of radius 2 m will be
a) 100 V-m
b) 200 V-m
c) 50 V-m
d) 25 V-m
Answer:  100 V-m

Question:

a)

b)

c)

d)

Answer:

Question:

a) 8 V-m
b) 12 V-m
c) 20 V-m
d) zero
Answer: 8 V-m

Question:  A hollow cylinder has a charge q coulomb within it. If fis the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:

a) 0.125 Nm²/C
b) 0.02 Nm²/C
c) 0.005 Nm²/C
d) 3.14 Nm²/C
Answer:  0.125 Nm²/C