Question # 1

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

The number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

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 electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

A charge on 4 coulomb is in the field of intensity 4N/C the force on the charge is.

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Uniform

Non uniform

Weak

Strong

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

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