ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

One joule is equal to

Question # 2

The resistance of an incandescent lamp is

Question # 3

Equal charges are given to two spheres of different radii. The potential will

Question # 4

The SI unit of electric flux is

Question # 5

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

Question # 6

Coulomb's force between two point charges depends upon

Question # 7

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

Question # 8

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 9

The current through a metallic conductor is due to the motion of

Question # 10

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)

Question # 11

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

Question # 12

The value of electrical constant of proportionality k is

Question # 13

One electron volt is equal to

Question # 14

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

Question # 15

Surface density of charge is defined as

Question # 16

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

Question # 17

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

Question # 18

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)

Question # 19

Heating effect caused by an electric circuit is written

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

Resistance of a conductor is increased, the currant will

Question # 25

The concept of field theory was put forward by

Question # 26

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

Question # 27

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

Question # 28

Ohm's law states that

Question # 29

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 30

A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
A. 2R
B. 4R
C. 16R
D. Zero
2 The graphical representation of ohm's law is
A. hyperbola
B. straight line
C. ellipse
D. parabola
3 A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be
A. 1840 KeV
B. 1/1840 KeV
C. 1 KeV
D. 920 KeV
4 A conducting wire is drawn to double its length. Final resistivity of the material will be
A. Double of the original one
B. Half of the original one
C. One fourth of the original one
D. Same as original one
5 Which one of the following is the unit of electric field intensity
A. JC-1
B. Vm-1
C. Cm-1
D. CJ-1
6 The capacitance of a parallel plate capacitor depends upon
A. Area of the plates
B. Separation between the plates
C. Medium between the plates
D. All of the above
7 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
8 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
9 In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
A. Four-fold
B. One-half
C. One-fourth
D. Zero
10 Capacitance of two or more capacitors
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above

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