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	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
2	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	A. 180 watt B. 10 watt C. 20 watt D. 60 watt
3	Resistance of a conductor is increased, the currant will	A. Decrease B. Increase C. Remain the same D. None of these
4	The substances whose resistance decreases with the increase in temperature these substances have coefficient of	A. positive temperature B. negative temperature C. absolute temperature D. zero temperature
5	The potential difference across each resistance in series combination is	A. same B. different C. zero D. none of these
6	In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be	A. 0.4 A B. 11.4 A C. 9.8 A D. 10.6 A
7	The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of	A. power B. current C. resistance D. temperature
8	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
9	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
10	A closed surface contains two equal and opposite charges. The net electric flux from the surface will be	A. Negative B. Positive C. Infinite D. Zero

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

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Coulomb's force between two point charges depends upon

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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

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

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

The SI unit of electric flux is

The unit of conductance is

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

The capacitance of a parallel plate capacitor depends upon

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Ohm is the unit of

The resistance of an incandescent lamp is

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

The thermistors are usually made of

Solar cell converts sunlight directly into

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

The resistance of a conductor does not depend on its

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

The SI unit of electric field intensity is

One electron volt is equal to

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

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

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

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

Ohm's law states that

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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

The charge carriers in gases are

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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?