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

The resistance of an incandescent lamp is

Question # 2

The speed of randomly moving electrons depends upon

Question # 3

The electric flux from a closed surface

Question # 4

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 5

Electric potential of earth is taken to be zero because the earth is good

Question # 6

The unit of intensity of electric field is

Question # 7

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 8

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

Question # 9

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 # 10

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 # 11

The electric field will be uniform

Question # 12

The fractional change in resistance per kelvin is known as

Question # 13

The relation between charge 'Q' and current 'I' is given by

Question # 14

The unit of conductance is

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

The charge carriers in electrolyte are positive and negative

Question # 19

In a voltmeter the conduction takes place due to

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 Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 22

The ohm's is defined as

Question # 23

Electric generators which convert mechanical energy into

Question # 24

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 # 25

The SI unit of capacitance is

Question # 26

Electric flux is defined by the relation

Question # 27

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

Question # 28

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 # 29

At any point on the right bisector of the line joining two equal and opposite charges

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
3 A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
A. Negative
B. Positive
C. Infinite
D. Zero
4 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
5 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2
6 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
7 Coulomb force, when any material medium is placed between two charges
A. Increases
B. Decreases
C. Remain unchanged
D. None of these
8 Electron volt is the unit of
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
9 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
10 If electric and gravitational force on an electron in a uniform electric field will be
A. E=mg/q
B. E=q/mg
C. E=,g/q
D. E=qg/m

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