#### twelfth standard english medium important multiple choice questions in physics

12th Standard

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Physics

Dont write anything on the question paper
Time : 00:10:00 Hrs
Total Marks : 20

Part - A

Answer each of the following questions

20 x 1 = 20
1. For sharper edge, the ______ is greater. This principle is used in Lightning arrestor

(a)

linear charge density

(b)

surface charge density

(c)

volume charge density

(d)

capacitance

2. For continuous charge distributions, _____ methods can be used.

(a)

integration

(b)

differentiation

(c)

multiplication

(d)

3. For a large charge accumulation, the end of the conductor should have larger curvature that is_________.

(a)

(b)

(c)

(d)

less bent

4. Relative permittivity (εr) is also known as ________

(a)

dielectric strength

(b)

dielectric constant

(c)

polarisability

(d)

susceptibility

5. The energy stored per unit volume of space is defined as________.

(a)

linear density

(b)

surface density

(c)

volume density

(d)

energy density

6. __________ is a very large unit of capacitance.

(a)

(b)

(c)

(d)

7. The total dipole moment per unit volume of the dielectric is________.

(a)

induction

(b)

charge distribution

(c)

polarisation

(d)

quantisation

8. An example for a Non-polar molecule is

(a)

H2O

(b)

N2O

(c)

CO2

(d)

NH3

9. Which instrument was used to demonstrate the electrostatic shielding?

(a)

Lightning arrester

(b)

Van de graaff generator

(c)

(d)

Gold leaf electroscope

10. Gauss law is another form of ________.

(a)

Newton's law

(b)

Kepler's law

(c)

Ohm's law

(d)

Coulomb's law

11. If a cube of side 5cm has a charge of 6 micro coulomb, then the surface charge density is ________

(a)

4 x102 μC/m2

(b)

4 x102 C/m2

(c)

4 x103 μC/m2

(d)

4 x103 C/m2

12. The electric flux is ________ if the electric field lines enter the closed surface.

(a)

positive

(b)

negative

(c)

zero

(d)

maximum

13. Electrostatic force is stroger than gravitational force by_________.

(a)

2.23 x 1039 times

(b)

2.25 x 1039 times

(c)

2.27 x 1039 times

(d)

2.29 x 1039 times

14. Which of the following is a scalar quantity?

(a)

electric dipole moment

(b)

electric field intensity

(c)

electric potential

(d)

current density

15. Capacitors use the principle of ________.

(a)

self induction

(b)

mutual induction

(c)

electrostatic induction

(d)

dielectric polarisation

16. When a point charge of 6mC is moved between two points in an electric field, the work done is 1.8 x 10-5 J. The potential difference between the two points is

(a)

1.08 V

(b)

1.08 μV

(c)

2 V

(d)

30 V

17. Electrostatics deals with the _________

(a)

charges in motion

(b)

static electric charges

(c)

charges through conductors

(d)

accelerated charges

18. When the amber is rubbed with fur, it absorbs bits of papers. This was invented by_______.

(a)

Amber

(b)

Thales

(c)

Gilbert

(d)

Benjamin Franklin

19. The force between like charges is _________.

(a)

attraction

(b)

repulsion

(c)

no force

(d)

none

20. The charge of an electron is _________.

(a)

1.6 x 10-19 C

(b)

1.6 x 10-91 C

(c)

16 x 10-20 C

(d)

6.1 x 10 -19 C