Question # 1

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

The minimum value of charge on any object is.

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1.6 x 10^-29 C

1.6 x 10^-19 C

1.6 x 10^-9 C

1 C

A capacitor of capacitance F micro is fully charged from a 20 V d.c supply what is the energy delivered by 20 V supply.

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2 mJ

10 m j

20 mJ

25 mj

Which of the following are sources of direct current.

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Batteries

Solare cells

Thermocouples

All of these

Capacitance is directly proportional to

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Distance between the plates

Di electric strength

Area of the plates

Charge multiplied by the applied voltage

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

The process due to which current flows only during alternate half cycle is known as.

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Filtration

saturation

Half wave rectification

Full wave rectification

The induced current in a circuit can be increased by

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of the above

The work done is moving a very small charge in an electric field from one point to another is

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Independent of the path

Equal to the potential difference between the two points.

Measured in V m-1

Measured in J c-1

Inductance divided by resistance and the product of capacitance and resistance both have units of.

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Charge

Time

Force

Current

What can be used as the unit of envery.

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N m-1

V A

W.s

V C-1

Which quantity decay exponentially when a capacitors is discharged.

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Charge only

Charge and voltage only

Charge and current only

Charge voltage and current

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

The direction of electric field line surround the test charge -q id

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Parallel

Perpendicular

Radially outward

Radially inward

The speed of the charging or discharging a capacitor depends upon the product of resistance and.

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Current

Voltage

Capacitance

Potential difference

What is term for tendency of a system to oscillate with larger amplitude at some frequencies than at others.

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Resonance

Impedance

Inductance

Capacitance

The electric bulb does not obey Ohm's law because.

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Current changes

Resistance changes

Heat is produced

All of these

The SI unit of mutual induction a

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Vs-1 A-1

V m -1 A-1

Henry

Tesla

Which statement is true about the Magnetic poles.

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

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