ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

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

Question # 2

The SI unit of current is

Question # 3

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

Question # 4

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

Question # 5

The SI unit of electric field intensity is

Question # 6

The capacity of a parallel plat capacitor depends on the

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

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 # 9

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

Question # 10

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

Question # 11

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 12

Resistance of a conductor depends upon

Question # 13

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

Question # 14

The concept of field theory was put forward by

Question # 15

The charge carriers in gases are

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
A. 11.0 ohm
B. 1.0 ohm
C. 7.0 ohm
D. 3.0 ohm
2 When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
A. Decreases
B. Increases
C. No change
D. May increase or decresase
3 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
4 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
5 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
A. power
B. current
C. resistance
D. temperature
6 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
7 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
8 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
9 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
10 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2

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