Free Printable Electrostatic 1 basic ( 12 grade)

1.

Name the physical quantities whose unit is J/C

a)

electric field

b)

electric potential

c)

dipole moment

d)

none of the above

2.

Force between two point charges kept at a distance ‘r’ is F. What is the distance between them, if the force between them reduces to F/3

a)

³√r

b)

3r

c)

²√r

d)

none of these

3.

An electric dipole is placed inside a hollow sphere at its center. Then,

a)

the electric flux through the sphere is zero.

b)

the electric field is zero at every point on the surface of the sphere.

c)

the electric field is non-zero at every point on the surface of sphere.

d)

none of these.

4.

What is not true for equipotential surface for a uniform electric field?

a)

equipotential surface is flat

b)

equipotential surface if spherical

c)

work done is zero

d)

electrical lines of force are perpendicular to the surface

5.

How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10^-19 C)

a)

6.3 × 10¹⁸

b)

6.3 × 10⁹

c)

1.6 × 10¹⁹

d)

1.6 × 10⁹

6.

When glass rod rubbed with silk cloth ,the glass rod will became

a)

Negatively charged

b)

Positively charged

c)

Neutral

d)

None of the above

7.

when an electric dipole is held at an angle in a uniform electric field,the net force F AND TORQUE $\tau$ on the dipole are

a)

F=0, $\tau$ =0

b)

F $\ne$ 0 ,,, $\tau$ $\ne$ 0

c)

F=0,, $\tau$ $\ne$ 0

d)

F $\ne$ $\tau$ =0

8.

Potential energy of an electric dipole held at an angle $\theta$ in a uniform electric field is zero ,,when $\theta$ is

a)

$0^{\degree}$

b)

$90^{\degree}$

c)

$180^{\degree}$

d)

$360^{\degree}$

9.

SI UNIT OF $\epsilon_0$

a)

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

b)

$CN^{-1}M$

c)

$C^2N^2m^2$

d)

$C^2Nm^{-1}$

10.

COULOMB'S LAW IS ONLY APPLICABLE FOR

a)

BIG CHARGES

b)

SMALL CHARGES

c)

POINT CHARGES

d)

ANY CHARGES

11.

The Constant K in coulomb 's law depends upon

a)

nature of medium

b)

system of units

c)

polarity of charge

d)

both a & b

12.

Frictional electrification means

a)

charging by induction

b)

charging by conduction

c)

charging by rubbing

d)

all of these

13.

force between two charges in vaccum is 81 N . when same charges placed in water witout changing the distance between the charges then force will be

a)

81 N

b)

40.5 N

c)

162 N

d)

1 N

14.

If the capacitance is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:

a)

846×10^-6Joule

b)

7.23×10^-3 Joule

c)

6.76×10^-5Joule

d)

5.94×10^-2Joule

15.

What is the voltage across the plates of the capacitor if the capacitance is 10 uF and the Charge stored is 30 uC?

a)

0.333 V

b)

3 V

c)

300 V

16.

The capacitance of a parallel-plate capacitor can be increased by:

a)

increasing the charge

b)

decreasing the charge

c)

increasing the plate separation

d)

decreasing the plate separation

17.

Suppose the electrostatic potential at some points in space are given by V = ( x² - 2x ). The electrostatic field strength at X= 1 is :

a)

zero

b)

-2

c)

2

d)

4

18.

Electrostatic potential energy is recorded in units of electron-Volts (eV). What is equivalent to 1 eV?

a)

1.602×10⁻¹⁹ 𝐽

b)

100 𝐽

c)

220 𝐽

d)

0.003 𝐽

19.

Which of the following is a correct expression for the potential energy of a charge placed near another charge?

a)

$qEd$

b)

$qE$

c)

$qV$

d)

$\frac{1}{4\pi\epsilon_0}\ \frac{Q}{r}$

20.

The electric flux due to any charge depends on

a)

Enclosed Charge by Gaussian surface

b)

Surface area of Gaussian surface

c)

On both - Enclosed Charge by Gaussian surface and Surface area of Gaussian surface

d)

The question is incomplete

Electrostatic 1 basic ( 12 grade)

Total questions: 20

Worksheet time: 12mins

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