Question # 1

The speed of randomly moving electrons depends upon

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pressure

volume

temperature

mass

The current through a metallic conductor is due to the motion of

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protons

neutrons

electrons

free electrons

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?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

Ohm is the unit of

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current

capacitance

energy

resistance

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

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Increase

Decrease

May increase or decrease

Remain the same

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)

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Q/4πr²

2Q/4πr²

Q.d

Zero

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

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

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At electric field is zero

The electric potential is zero

The electric potential decreases with increasing distance from the centre

The electric field is perpendicular to the line joining the charges

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

The electric intensity at infinite distance from the point charge will be

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Infinite

Positive

Zero

Negative

In a charged capacitor the energy is stored in

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Both in positive and negative charges

Positive charges

The edges of the capacitor plates

The electric field between the plates

Ohm established a relation between

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voltage and resistance

voltage and charge

voltage and current

voltage resistance and charge

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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11.0 ohm

1.0 ohm

7.0 ohm

3.0 ohm

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

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-q

+q

-2q

+4q

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ECAT Physics Chapter 12 Electrostatics Online Test MCQs With Answers

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