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	The resistance of the given conductor can be increased by	A. Increasing the area B. Changing resistivity C. Decreasing the length D. None of the above because change does not matter because in any case the volume remains the same
2	The unit of conductance is	A. ohm B. meter C. mho D. ohm-meter
3	The dot product of electric field intensity E and vector area A is called	A. Electric potential B. Electric flux C. Electric field D. Magnetic field
4	If the two charges in Coulomb's law have double distance between them, then electric force	A. Becomes two-fold B. Becomes four-fold C. Remains the same D. None of these
5	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
6	A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy	A. 200 J B. 100 J C. 1000 J D. 400 J
7	Coulomb's force between two point charges depends upon	A. Magnitude of charges B. Distance between them C. Medium in which they are located D. All of the above
8	In a voltmeter the conduction takes place due to	A. Electrons only B. Holes only C. Electrons and holes D. Electrons and ions
9	Specific resistance of a wire depends upon	A. Length B. Cross-section area C. Mass D. None
10	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

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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

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

One joule is equal to

If electric and gravitational force on an electron in a uniform electric field will be

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

The earth's potential is taken as

The fractional change in resistance per kelvin is known as

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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

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

Ohm established a relation between

Consider a spherical shell of metal at he centre of which a positive point charge is kept

The resistance of the given conductor can be increased by

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

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

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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

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

Battery is charged in motor cars, which is based on

The SI unit of permitivity is

The SI unit of electric flux is

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

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 unit of intensity of electric field is

The SI unit of current is

The potential difference across each resistance in series combination is

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

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

Surface density of charge is defined as

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

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