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

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

Question # 2

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 3

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

Question # 4

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 5

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

Question # 6

The capacitance of a parallel plate capacitor depends upon

Question # 7

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

Question # 8

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 9

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 10

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

Question # 11

Surface density of charge is defined as

Question # 12

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 13

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

Question # 14

Solar cell converts sunlight directly into

Question # 15

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

Question # 16

The resistance of the given conductor can be increased by

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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 # 21

A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy

Question # 22

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

Question # 23

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

Question # 24

The liquid which conduct current is known as

Question # 25

The SI unit of permitivity is

Question # 26

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 # 27

The electric flux is linked with a surface will be maximum when

Question # 28

Resistor is a device which convert electric energy to

Question # 29

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
2 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates
3 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
4 At any point on the right bisector of the line joining two equal and opposite charges
A. At electric field is zero
B. The electric potential is zero
C. The electric potential decreases with increasing distance from the centre
D. The electric field is perpendicular to the line joining the charges
5 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
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 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
8 If a 40 watt light bulb burns for 2 hours. how much heat is generated
A. 288 x 103J
B. 288 x 108J
C. 288 x 105J
D. 288 x 106J
9 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre
10 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
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1

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