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	Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends	A. 120 C B. 240 C C. 20 C D. 4 C
2	The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is	A. 10 KJ B. 5 KJ C. 2 KJ D. 1 KJ
3	The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to	A. Coulomb's law B. Gauss's law C. Biot-Sarwat law D. Ampere's law
4	For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is	A. 3/5 ohm B. 2 ohm C. 6/5 ohm D. 3 ohm
5	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
6	The SI unit of electric field intensity is	A. CN^-1 B. NC^-1or Vm^-1 C. JC^-1 D. AV^-1
7	Ohm is the unit of	A. current B. capacitance C. energy D. resistance
8	Magnetic effect at a point caused due to flow a current depend upon the	A. Quantity of current B. Distance from current C. Both the quantity of current and distance from current element D. None of the all
9	The charge per unit time through any cross-section of a conductor is called	A. capacitance B. electric power C. current D. potential difference
10	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	A. 1 : 2 B. 2 : 1 C. 1 : 4 D. 4 : 1

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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

Which one of the following is the unit of electric field intensity

The ohm's is defined as

Capacitance of two or more capacitors

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

The electric flux is linked with a surface will be maximum when

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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

The earth's potential is taken as

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

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

The minimum charge on any object can not be less than

The SI unit of permitivity is

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Resistor is a device which convert electric energy to

Thermocouple is an arrangement of two different metals

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)

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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

106electrons are moving through a wire per second, the current developed is

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

The charge carriers in gases are

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

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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

Ohm established a relation between

At ordinary temperature, an increase in temperature increases the conductivity of

The electric intensity outside the two oppositely charged parallel metal plates is

The graphical representation of ohm's law is

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ECAT Physics Chapter 12 Important MCQ's

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The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

10⁶electrons are moving through a wire per second, the current developed is

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