ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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ECAT Physics Chapter 12 Important MCQ's

Sr.#	Question	Answer
1	Consider a spherical shell of metal at he centre of which a positive point charge is kept	A. The electric filed is zero outside the shell B. The electric field is zero everywhere C. The electric field is zero in the region inside the shell D. The electric field is non-zero in both regions outside and inside the shell
2	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	A. 2 R B. R/4 C. R/2 D. R
3	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	A. Increase B. Decrease C. Remain F D. Become 10F/9
4	The SI unit of capacitance is	A. Farad B. Henry C. Ohm D. Volt
5	A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be	A. 64 W B. 80 W C. 100 W D. 125 W
6	Current provided by a battery is maximum when	A. Internal resistance equal to external resistance B. Internal resistance is greater than external resistance C. Internal resistance is less then external resistance D. None of these
7	The conductivity of a superconductor is	A. Infinite B. Very large C. Very small D. Zero
8	Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?	A. 3RΩ B. 2R/4Ω C. R/3Ω D. 2R/3Ω
9	Ohm's law states that	A. The current through a resistor is directly proportional to the applied voltage B. The voltage across a resistor is directly proportional to the current passing through it C. Resistance is the constant of proportionality between the voltage and current D. all of these
10	The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is	A. 10Ω B. 20Ω C. 30Ω D. 40Ω

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ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Physics ECAT Pre Engineering Chapter 12 Electrostatics

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

Resistor is a device which convert electric energy to

The liquid which conduct current is known as

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

The speed of randomly moving electrons depends upon

The relation between charge 'Q' and current 'I' is given by

The minimum charge on any object can not be less than

The concept of field theory was put forward by

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

Electric flux is defined by the relation

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

The unit of intensity of electric field is

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

The dot product of electric field intensity E and vector area A is called

Electric potential of earth is taken to be zero because the earth is good

Resistance of a conductor depends upon

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Ohm established a relation between

Which one of the following has larger value of relative permitivity Erat room temperature?

The thermistors are usually made of

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

In a charged capacitor the energy is stored in

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

The earth's potential is taken as

At any point on the right bisector of the line joining two equal and opposite charges

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)

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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ECAT Physics Chapter 12 Important MCQ's

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Which one of the following has larger value of relative permitivity E_rat room temperature?