Free Printable WEEKLY TEST

1.

The charge of an electron is

a)

$-1.6\ X\ 10^{-18}\ C$

b)

$1.6\ X\ 10^{-18}\ C$

c)

$16X\ 10^{-19}\ C$

d)

$-16X\ 10^{-19}\ C$

2.

the unit of permittivity

a)

$C^2N^{-1}m^{-2}$

b)

$C^{-2}N^1m^{-2}$

c)

$C^2N^{-1}m^2$

d)

$C^2N^1m^{-2}$

3.

the relative permittivity for a medium

a)

$\epsilon_r=1$

b)

$\epsilon_r>1$

c)

$\epsilon_r\ge1$

d)

$\epsilon_r<1$

4.

The expression for Coulomb force is true only for

a)

point charges

b)

system of charges

c)

Both

d)

none

5.

the strength of the force between the two charges in water is ................ compared to the force between the same two charges in vacuum.

a)

Reduced by 80 times

b)

Reduced by 160 times

c)

increased by 80 times

d)

increased by 160 times

6.

When common salt (NaCl) is taken in water, the electrostatic force between Na and Cl ions is reduced due to the high

a)

Relative permittivity of water

b)

electric field of water

c)

electric potential of water

d)

Relative charge of water

7.

as distance increases, the electric field ...... in magnitude.

a)

Increase

b)

Remains same

c)

Decreases

d)

Not affect

8.

The number of electric field lines that emanate from the positive charge is directly proportional to

a)

Magnitude of the field

b)

Magnitude of the charge

c)

Magnitude of the distance square

d)

Magnitude of the permittivity

9.

which of the following sequence represent the electric fields density at point A,B,C in ascending order

a)

A-B-C

b)

B-C-A

c)

C-B-A

d)

C-A-B

10.

From the diagram. $the\ ratio\ of\ \left|\frac{q_1}{q_2}\right|$

a)

$\frac{1}{3}$

b)

$\frac{1}{6}$

c)

$\frac{5}{18}$

d)

$\frac{1}{4}$

11.

The SI unit of dipole moment is

a)

Cm

b)

Nm

c)

$cm^{-1}$

d)

$Nm^{-1}$

12.

The electric dipole moment for a collection of n point charges is given by

a)

$\overrightarrow{P}\ =2qa$

b)

$\overrightarrow{P}\ =\sum_{i=1}^nq_ir_i$

c)

$\overrightarrow{P}\ =\sum_{i=1}^{\propto}q_ir_i$

d)

$\overrightarrow{P}\ =\sum_{i=0}^{\propto}q_ir_i$

13.

The direction of the electric field at points on the dipole axis is directed .......... of dipole moment

a)

opposite to the direction

b)

parallel to the direction

c)

anti-parallel to the direction

d)

along the direction

14.

At very large distances, the electric

field due to a dipole varies as

a)

$\frac{1}{r}$

b)

$\frac{1}{r^2}$

c)

$\frac{1}{r^3}$

d)

$\frac{1}{r^4}$

15.

the torque is written in terms

of the vector product as

a)

$\overrightarrow{\tau}\ =\ \overrightarrow{P}\ X\ \overrightarrow{E}$

b)

$\overrightarrow{\tau}\ =\ P.E$

c)

$\overrightarrow{\tau}\ =\ PE\ \sin\theta$

d)

$\overrightarrow{\tau}\ =\ P\ X\ E\ \sin\theta$

16.

which of the following force is a conservative

force,

a)

Gravitational force

b)

Coulomb force

c)

Both Coulomb force and Gravitational force

d)

none

17.

Microwave oven works on the principle of

a)

torque acting on an electric charge

b)

torque acting on an electric dipole

c)

torque acting on an electric field

d)

torque acting on an electric force

18.

Electric potential at point P depends

only on the

a)

electric field

b)

electric force

c)

electric charge

d)

electric dipole

19.

the unit of

electric potential is

a)

$J\ C^{-1}$

b)

volt

c)

both $J\ C^{-1}$ and volt are correct

d)

both $J\ C^{-1}$ and volt are not correct

20.

If the source charge q is positive

a)

$V>0$

b)

$V<0$

c)

$V=0$

d)

$V\le0$

21.

Positive charge +q´ moves from

higher electric potential to lower

electric potential then which of the following statement is correct

a)

$V_p>V_Q>V_R$

b)

$V_p<V_Q<V_R$

c)

$V_p>V_Q\le V_R$

d)

$V_R>V_Q>V_P$

22.

Which charge configuration produces

a uniform electric field?

a)

point charge

b)

uniformly charged infinite line

c)

uniformly charged infinite plane

d)

uniformly charged spherical shell

23.

An electric dipole is placed at an alignment angle of 30o with an electric field of 2 × 105 N C–1. It experiences atorque equal to 8 N m. The charge on the dipole if the dipole length is 1 cm is

a)

4 mC

b)

8 mC

c)

5 mC

d)

7 mC

24.

Two identical point charges of

magnitude –q are fixed as shown in the

figure below. A third charge +q is placed

midway between the two charges at

the point P. Suppose this charge +q is

displaced a small distance from the

point P in the directions indicated

by the arrows, in which direction(s)

will +q be stable with respect to the

displacement?

a)

A1 and A2

b)

B1 and B2

c)

both directions

d)

No stable

25.

Electrostatic force obeys

a)

the superposition principle

b)

Newton's second law

c)

Both laws

d)

none

WEEKLY TEST - I

Total questions: 25

Worksheet time: 19mins

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