12th Class Physics MCQS Chapter 1

A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be:

920 keV

1 keV

1884 ke V

1/1840 keV

Flux through any closed surface is:

1/?²_? times the total charge enclosed in it

1/?_? ties the total charge enclosed in ti

?²_? time the total charge enclosed in it

?_? time the total charge enclosed in it

The photo copying process is called

79.5

1.06

1.006

1.0006

Electric flux is a:

None of these

Vector quantity

Variable quantity

Scalar quantity 

The photo copying process is called

Xerography

None of these

Inkjet Printer

Both (a) and (b)

Electric potencial of earth is taken to be zero because the earth is good:

Dielectric

Semiconductor

Conductor

Insulator

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

8.3 x 10² N/C

1.2 x 10⁴ C/N

8.3 x 10^-2 N/C

1.2 x 10⁴ N/C

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

32 eV

16 eV

4 eV

64 eV

The number of electrons in one coulomb charge is equal to

6.2 x 10²¹ electrons

Zero electrons

6.2 x 10¹⁸ electrons

1.6 x 10^-22 electrons

Metals are good conductors of electricity because they have

Small number of electrons

Small number of free electrons

Large number of free electrons

Large number of bounded electrons