Question # 1

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

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1.2 x 10⁴ N/C

1.2 x 10⁴ C/N

8.3 x 10² N/C

8.3 x 10^-2 N/C

Electric field intensity at a point is defined by the relation.

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E= q/F

E = F/q

E = qF

E = F/q2

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

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