Question # 1

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

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

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25

225

625

1250

The resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

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

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Quantity of current

Distance from current

Both the quantity of current and distance from current element

None of the all

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

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

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Infinite

Positive

Zero

Negative

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

If the two charges in Coulomb's law have double distance between them, then electric force

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Becomes two-fold

Becomes four-fold

Remains the same

None of these

The charge carriers in gases are

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electrons

ions

protons

ions and electrons

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

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108 g

10.8 g

0.8 g

108/0.8 g

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

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

The charge carriers in electrolyte are positive and negative

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protons

electrons

ions

none of these

The resistivity of a substance depends upon the

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length

mass

area

temperature

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