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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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Total Questions30
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Time Allowed30
Physics ECAT Pre Engineering Chapter 12 Electrostatics
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Question # 1
A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
Question # 2
Heating effect caused by an electric circuit is written
Question # 3
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 # 4
A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J
Question # 5
Which of the following represents an electric current?
Question # 6
If the distance of separation between two chares is increased, the electrical potential energy of the system will
Question # 7
An electric charge at rest is
Question # 8
A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
Question # 9
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 # 10
Electric potential of earth is taken to be zero because the earth is good
Question # 11
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?
Question # 12
The unit of resistivity is
Question # 13
Electric flux is defined by the relation
Question # 14
One coulomb of charge is created by
Question # 15
If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
Question # 16
Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
Question # 17
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 # 18
The fractional change in resistance per kelvin is known as
Question # 19
Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
Question # 20
The electric flux is linked with a surface will be maximum when
Question # 21
Some charge is being given to a conductor. Then its potential
Question # 22
Current provided by a battery is maximum when
Question # 23
The unit of resistance is
Question # 24
The concept of field theory was put forward by
Question # 25
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
Question # 26
The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
Question # 27
Resistance of a conductor is increased, the currant will
Question # 28
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
Question # 29
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 # 30
The graphical representation of ohm's law is
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ECAT Physics Chapter 12 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts? |
A. 10-1A
B. 10-2A
C. 10-4A
D. 1 mA
|
| 2 | In a voltmeter the conduction takes place due to |
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
|
| 3 | 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
|
| 4 | The electric field intensity at a point due to a point charge |
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
|
| 5 | A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is |
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
|
| 6 | 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
|
| 7 | Capacitance of two or more capacitors |
A. Increases in series combination
B. Increases in parallel combination
C. Remains unchanged
D. None of the above
|
| 8 | 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
|
| 9 | Ohm is the unit of |
A. current
B. capacitance
C. energy
D. resistance
|
| 10 | The liquid which conduct current is known as |
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
|
Test Questions