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

Resistor is a device which convert electric energy to

Question # 2

The charge carriers in electrolyte are positive and negative

Question # 3

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

Question # 4

The dot product of electric field intensity E and vector area A is called

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

Ohm established a relation between

Question # 7

The thermistors are usually made of

Question # 8

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

Question # 9

The resistance of the given conductor can be increased by

Question # 10

The concept of field theory was put forward by

Question # 11

One joule is equal to

Question # 12

Electron volt is the unit of.

Question # 13

The capacity of a parallel plat capacitor depends on the

Question # 14

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

Question # 15

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

Question # 16

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 17

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

Question # 18

The relation V = IR represents

Question # 19

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

Question # 20

An electric charge at rest is

Question # 21

The capacitance of a parallel plate capacitor depends upon

Question # 22

Electric generators which convert mechanical energy into

Question # 23

Surface density of charge is defined as

Question # 24

Heating effect caused by an electric circuit is written

Question # 25

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

Question # 26

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 27

Solar cell converts sunlight directly into

Question # 28

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 29

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 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
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
3 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these
4 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
A. 3.9
B. 4
C. 4.2
D. 6
5 The relation V = IR represents
A. Ampere law
B. Faraday's law
C. Ohm's law
D. Len's law
6 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
7 Specific resistance of a wire depends upon
A. Length
B. Cross-section area
C. Mass
D. None
8 A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
A. 5
B. 0.5
C. 0.005
D. 50
9 Current provided by a battery is maximum when
A. Internal resistance equal to external resistance
B. Internal resistance is greater than external resistance
C. Internal resistance is less then external resistance
D. None of these
10 One coulomb of charge is created by
A. 10 electrons
B. 1.6 x 10-19electrons
C. 6.25 x 1018electrons
D. 6.25 x 1021electrons

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