Question # 1

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Choose an answer

Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

Ohm's law states that

Choose an answer

The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

The SI unit of conductivity is

Choose an answer

ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Choose an answer

1/3 V

2/3 V

3/2 V

3V

In a voltmeter the conduction takes place due to

Choose an answer

Electrons only

Holes only

Electrons and holes

Electrons and ions

The electric flux from a closed surface

Choose an answer

Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

Resistor is a device which convert electric energy to

Choose an answer

Heat energy

Chemical energy

Elastic energy

All of the above

The thermistors are usually made of

Choose an answer

Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

The resistance of an incandescent lamp is

Choose an answer

Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

Choose an answer

2 R

R/4

R/2

R

The liquid which conduct current is known as

Choose an answer

heating effect

chemical energy

electrolyte

ohm's law

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Choose an answer

C

C/2

Zero

2C

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Choose an answer

21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

The conductivity of a superconductor is

Choose an answer

Infinite

Very large

Very small

Zero

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Choose an answer

5μF

20μF

10μF

15μF

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Choose an answer

Zero

F/2

F

2F

More Classes

Other Links

ECAT Physics Chapter 12 Electrostatics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer