Question # 1

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

The phase angle between the voltage and current is A.C. circuit though a resistor is.

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0 ^o

45 ^o

90 ^o

180 ^o

At series resonance in L-C-R circuit the impedance is equal to.

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Ohmic resistance

Inductive reactance

Capacitive reactance

Inductive reactance minus capacitive reactance

What can be used as the unit of envery.

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N m-1

V A

W.s

V C-1

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

Materials that experience a force from stronger to weaker regions of magnetic field are called.

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Non magnetic

Paramagnetic

Ferromagnetic

Diamagnetic

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

In which of the following eddy current is not used

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Induction furnace

Automobile speedometer

Electromagnetic damping

X- rays diffraction

What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.

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4.8 W

14.5 W

30 W

60 W

The cause of ferromagnetism is.

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Orbital motion of elections

spin Motion of electrons

Permanent dipole memento

Spin angular momentum

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

Two magnetic lines of force

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Out near the poles

Never cut each other

Cut at a neutral point

Cut according to position of the magnet

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

The resistance offered by one cubic meter of a substance is known as.

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Reactance

Conductance

Conductivity

Resistivity

In alternating current circuits the quantity which plays the same role as resistance in direct current circuits is called.

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Reactance

Admittance

Conductance

Impedance

A heart coil is out into two equal parts and only one part is now used in the heater The heat generated will be.

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Halved

One fourth

Doubled

4 times

In a crystal lattice

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Atoms are arranged in an order way

Atoms are arranged in a random way

Holes are arranged in an order way

Electrons are arranged in an order way

On which principle the induction coil works on.

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Self induction

Ampere's rule

Mutual induction

Gauss's law

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

A charged capacitor has charge on its

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Outside surface

Inner surface

Surroundings

Mid point

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