ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Question # 2

In a charged capacitor the energy is stored in

Question # 3

One coulomb of charge is created by

Question # 4

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 5

In a voltmeter the conduction takes place due to

Question # 6

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 7

The resistance of a conductor does not depend on its

Question # 8

The resistivity of a substance depends upon the

Question # 9

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 10

The electric lines of force are

Question # 11

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 12

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 13

Ohm's law states that

Question # 14

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 15

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 16

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 17

Current provided by a battery is maximum when

Question # 18

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 19

Electron volt is the unit of

Question # 20

The charge carriers in electrolyte are positive and negative

Question # 21

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 22

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 23

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 24

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 25

The electric field intensity at a point due to a point charge

Question # 26

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 27

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

Question # 28

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 29

Coulomb force, when any material medium is placed between two charges

Question # 30

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
2 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
3 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
4 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass
5 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
6 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
7 The electric flux is linked with a surface will be maximum when
A. The surface is held parallel to the electric field
B. The surface is held perpendicular to the electric field
C. The surface makes an angle of 45° with the electric field
D. All of the above
8 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
9 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A
10 The SI unit of capacitance is
A. Farad
B. Henry
C. Ohm
D. Volt

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