This document contains a monthly physics test for Class XII with multiple choice and long answer questions. The test covers topics in electrostatics including electric field, electric flux, electric potential, electric dipole moment, Gauss's law, and Coulomb's law. It has 16 total marks worth of questions testing comprehension of fundamental concepts and abilities to define, derive and apply equations for various electrostatic situations.

1. Monthly Test
Subject : Physics Time : 1
Hour
Class : XII M.M. 20
Instructions: All questions are compulsory
. Q.1 How many electrons make one coulomb of charge. 1
Q.2 Give the units and dimensional formula of electric flux. 1
Q.3 The value of electric field at the centre of solid sphere is
(a) Q/4πԐ0r2
(b) zero (c) q0/4πԐ0r2
(d) q0/4πԐ0r2
1
Q.4 Why two electric lines of force cannot intersect each other.
Q.5 What do you mean by quantization of charge? Define 1 coulomb
of charge.
(1X7 = 7)
Q.9 Define electric field. Give its units and dimensional formula.
Define electric dipole moment and also give its units with
dimensional formula. Also drive an expression for E.F. intensity at
any point due to an electric dipole.
Q.11 Define electric potential. Give its units and dimensional
formula. Drive an expression for E.P. at any point due to a point
charge.
(4X4 = 16)
Q14 Q.16 How many electrons pass through a lamp in 2 minutes if
the current through it is 500 mA.
.6 Calculate Coulomb’s force and the nature of force b/w a proton
and an electron separated by 0.8 X 10-15
m.

3. ASCENT PUBLIC SENIOR SECONDARY SCHOOL PADHAR.
Monthly Test
Subject : Physics Time : 1
Hour
Class : XII M.M. 20
Instructions: All questions are compulsory.
Q.1 When an electric dipole is in stable equilibrium then the angle
between electric dipole moment p and electric field strength E is
a) 0 b) π c) π/4 d) π/2 1
Q.2 Shown below is a distribution of charges. The flux of electric
field due to these charges through surface S is
+q -q
a) 3q/E0 b) 2q/E0 c) q/E0 d) Zero 1
Q.3 What is the angle between electric dipole moment and electric
field strength due to it on the equatorial line.
a) 0 b) 90 c) 180 d) None 1
Q.4 An electric dipole placed in a uniform E.F. experience
a) Both torque and a net force.
b) Only a force but no torque.
c) Only a torque but no force.
d) No torque and no force. 1
Q.5 Drive relationship b/w E.F. and E.P. 2
Q.6 Give four properties of electric lines of force. 2
Q.7 State and prove Gauss’s theorem. Drive an expression for the
electric field intensity due to a uniform charged solid sphere. 4
Q.8 Define electric field. Give its units and dimensional formula.
Define electric dipole moment and also give its units with
dimensional formula. Also drive an expression for E.F. intensity at
any point on the equatorial line due to an electric dipole. 4
Q.9 Drive an expression for the torque experienced by an electric
dipole placed in uniform electric field. Also drive an expression for
the electric potential energy for the same. 4

4. ASCENT PUBLIC SENIOR SECONDARY SCHOOL PADHAR.
Monthly Test
Subject : Physics Time : 1
Hour
Class : XII M.M. 20
Instructions: All questions are compulsory.
Q.1 What are units and dimensional formula of Ԑ0.
1
Q.2 Why two electric lines of force cannot intersect each other ? 1
Q.3 The value of electric field inside a spherical shell is 1
(a) Q/4πԐ0r2
(b) zero (c) q0/4πԐ0r2
(d) q0/4πԐ0r2
1
Q.4 Plot a graph b/w E & r to represent EF due to a solid sphere. 1
Q.5 State Coulomb’s law in electrostatics and give its vector form. 2
Q.6 Calculate Coulomb’s force and the nature of force b/w two α
particles separated by a distance of 3.2 X10-15
m. 2
Q.7 State and prove Gauss’s Theorem in electrostatics and discuss
the special cases. Also deduce Coulomb’s law from it. 4
Q.8 Define electric field. Give its units and dimensional formula.
Define electric dipole moment and also give its units with
dimensional formula. Also drive an expression for E.F. intensity at
any point on the equatorial line due to an electric dipole. 4
Q.9 Define electric potential. Give its units and dimensional formula.
Drive an expression for E.P. at any point due to an electric dipole. 4