Question # 1

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

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

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positive temperature

negative temperature

absolute temperature

zero temperature

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

The resistivity of a substance depends upon the

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length

mass

area

temperature

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

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C

C/2

Zero

2C

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be

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711μF

611μF

811μF

511μF

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

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Infinite

Positive

Zero

Negative

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

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

The electric field due to an infinite long thin wire at a distance R varies as

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1/R

1/R²

R

R²

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

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

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E=mg/q

E=q/mg

E=,g/q

E=qg/m

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

The relation between charge 'Q' and current 'I' is given by

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Q = I/t

Q = It

Q = I²t

Q = I²/t

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