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Physics ECAT Pre Engineering Chapter 12 Electrostatics
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Total Questions30
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Time Allowed30
Physics ECAT Pre Engineering Chapter 12 Electrostatics
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Question # 1
A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
Question # 2
Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
Question # 3
One coulomb per second is equal to
Question # 4
The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
Question # 5
The substances whose resistance decreases with the increase in temperature these substances have coefficient of
Question # 6
A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy
Question # 7
One electron volt is equal to
Question # 8
The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
Question # 9
The electric flux is linked with a surface will be maximum when
Question # 10
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 # 11
The energy stored in a charge capacitor
Question # 12
A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to
Question # 13
The unit of intensity of electric field is
Question # 14
In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
Question # 15
The resistivity of a substance depends upon the
Question # 16
The resistance of an incandescent lamp is
Question # 17
Heating effect caused by an electric circuit is written
Question # 18
When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be
Question # 19
The SI unit of electric flux is
Question # 20
In bringing an electron towards another electron, electrostatic potential energy of system
Question # 21
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
Question # 22
The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be
Question # 23
The resistance of a conductor does not depend on its
Question # 24
The electric field intensity at a point due to a point charge
Question # 25
Which one of the following causes production of heat when current is set up in a wire?
Question # 26
Consider a spherical shell of metal at he centre of which a positive point charge is kept
Question # 27
The earth's potential is taken as
Question # 28
At ordinary temperature, an increase in temperature increases the conductivity of
Question # 29
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
Question # 30
The conductivity of a superconductor is
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