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	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
3	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
4	The SI unit of current is	A. watt B. coulomb C. volt D. ampere
5	If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us	A. parabola B. straight line C. hyper bola D. ellipse
6	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	A. -q B. +q C. -2q D. +4q
7	A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor	A. Increases B. Decreases C. Remain unchanged D. Becomes infinite
8	A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)	A. 2 B. 1 C. 0.5 D. 1.5
9	Resistance of a conductor is increased, the currant will	A. Decrease B. Increase C. Remain the same D. None of these
10	A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is	A. C B. C/2 C. Zero D. 2C

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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

If a 40 watt light bulb burns for 2 hours. how much heat is generated

The resistance of the given conductor can be increased by

If we increase the distance between two plates of the capacitor, the capacitance will

The unit of conductance is

The speed of randomly moving electrons depends upon

Which one of the following causes production of heat when current is set up in a wire?

Coulomb force, when any material medium is placed between two charges

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

The conductivity of a superconductor is

The SI unit of electric field intensity is

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

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

Physicist George Simon ohm was a

One electron volt is equal to

The charge carriers in gases are

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

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

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

Surface density of charge is defined as

The charge carriers in electrolyte are positive and negative

Heating effect caused by an electric circuit is written

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

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

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Capacitance of two or more capacitors

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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

In bringing an electron towards another electron, electrostatic potential energy of system

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

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

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ECAT Physics Chapter 12 Important MCQ's

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

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?