Question # 1

A germanium atom is

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Monovalent

Diavalent

Travalent

Tetravalent

Electrical energy is transmitted at high alternating voltages which of the following is not a valid reason for doing this.

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At high voltage a.c is safer than d.c.

For a given powers, there is lower current with higher voltage.

There is a smaller energy loss at high voltage and lower current

The transmission lines can be thinner with a lower current.

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

Why are charged capacitors dangerous.

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They can leak a harmful chemicals

They can cause loss of vision

They can release a lethal charge

They can release gama rays.

If a person winds a coil of wire around a steel rod and then passes an electric current through the wire then the

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Steel rod becomes an electromagnet

Steel rod becomes hot

Wire becomes magnetized

wire becomes demagnetized

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

Which method of charging is involved in making lightning.

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Induction

Friction

Contact

Convection

if two conductors in the same vicinity each possess one coulomb of charge of opposite sign when one volt potential difference in established between them we may say they possess

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A capacitance of one henry

An inductance of one henry

An impedance of one ohm

A capacitance of one farad

An electric Heater and a fan are marked 1000 W, 250 V and 100 W , 220 V respectively The resistance of fan is.

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Equal to that of heater

Greater than that of heater

Less than that of heater

Zero

In which process the passage of an electric current through a conductor releases heat.

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Joule heating

Ohmic heating

resistive heating

All of these

The current passing through the switch s will be

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Zero

3 A

4.5 A

10 A

The force on a point charge due to electromagnetic fields is called.

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Lorenz force

Gauss's force

Newton's force

Ampere's force

What happens to the energy of a charged condenser is plate separation is increased.

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It decreases

It increases

It becomes zero

It remains unchanged

An electric current in conductors is due to the flow of.

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Positive ion

Negative ion

Positive charges

Free electrons

A pair of point charges with equal magnitude and opposite sign separated by a distance 'r' produce.

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Electric dipole

Electric charge

Electric field

electric arc

How the small bulbs used for decoration purposes are connected.

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In parallel

In series

In mixed order

In vertical position

House hold circuits are mostly

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Wired in sires

Wired in parallel

Made using wires of gold

Made using wires of silver

A pure capacitor is connected in an AC circuit The power factor of the circuit will be.

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Unity

Infinity

0.5

Zero

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

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Voltage

Current

Wattage

Resistance

The capacity of a spherical conductor is numerically equal to its.

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Surface area

Diameter

Radius

Volume

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

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