ECAT Pre General Science Chapter 12 online mcq test with answers for Physics chapter 12 (Electrostatics)

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ECAT Physics Chapter 12 Important MCQ's

Sr.#	Question	Answer
1	If electric and gravitational force on an electron in a uniform electric field will be	A. E=mg/q B. E=q/mg C. E=,g/q D. E=qg/m
2	The relation between charge 'Q' and current 'I' is given by	A. Q = I/t B. Q = It C. Q = I²t D. Q = I²/t
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 electric field due to an infinite long thin wire at a distance R varies as	A. 1/R B. 1/R² C. R D. R²
5	The charge carriers in gases are	A. electrons B. ions C. protons D. ions and electrons
6		A. 5μF B. 10μF C. 3μF D. 6μF
7	The resistance of an incandescent lamp is	A. Smaller when switched on B. Greater when switched off C. The same whether it is switch off or switch on D. Greater when switched on
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	A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance	A. Increase k time B. Decreases k times C. Decreases 1/K times D. Remains unchanged
10	Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be	A. 0.52 A B. 1 mA C. 0.7 mA D. 1.4 A

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ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

ECAT Pre General Science Physics Chapter 12 Electrostatics

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

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

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

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 colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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

The value of electrical constant of proportionality k is

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

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

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

One joule is equal to

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

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 conductivity of a superconductor is

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

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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

Current provided by a battery is maximum when

The SI unit of conductivity is

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

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

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

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

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

An electric charge at rest is

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

The SI unit of permitivity is

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ECAT Physics Chapter 12 Important MCQ's

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

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