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

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 2

Ohm's law states that

Question # 3

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 4

The resistance of a conductor does not depend on its

Question # 5

Resistor is a device which convert electric energy to

Question # 6

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

Question # 7

The electric field intensity at a point due to a point charge

Question # 8

Cause of heat production in a current carrying conductor is

Question # 9

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

Question # 10

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 11

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

Question # 12

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

Question # 13

The thermistors are usually made of

Question # 14

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 15

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 16

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 17

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 18

The charge carriers in gases are

Question # 19

Magnetic effect at a point caused due to flow a current depend upon the

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

In a voltmeter the conduction takes place due to

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

The resistivity of a substance depends upon the

Question # 26

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

Question # 27

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 28

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 29

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 30

The conductivity of a superconductor is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
2 Specific resistance of a wire depends upon
A. Length
B. Cross-section area
C. Mass
D. None
3 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
4 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
5 If the two charges in Coulomb's law have double distance between them, then electric force
A. Becomes two-fold
B. Becomes four-fold
C. Remains the same
D. None of these
6 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
7 A condenser of capacity 50μF is charged to 10 V.The energy stored is
A. 1.25 x 10-3J
B. 3.75 x 10-3J
C. 2.5 x 10-3J
D. 5 x 10-3J
8 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
9 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
10 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass

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