Electricity and Magnetic Fundamentals

1. _________ is a substance of whose molecules consist of the same kind of atom.

1. Mixture
2. Compound
3. Element
4. Isotope

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2. _________ is an electromagnet with its core in the form of a close magnetic ring.

1. Solenoid
2. Paraboloid
3. Toroid
4. Cycloid

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3. A 200-watt lamp working for 24 hours will consume approximately _________ units.

1. 50
2. 5
3. 24
4. 0.5

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4. A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 Ω, Calculate the number of ampere turns?

1. 100
2. 50
3. 3OO
4. 600

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5. A commercial alloy of aluminum nickel, and iron with cobalt, copper and titanium added to produce about 12 grades.

1. Alnico
2. Brass
3. Aluminum
4. Constantan

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6. A current if flowing east along a power line. If the earth's field is neglected, the direction of the magnetic field below it is

1. North
2. South
3. East
4. West

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7. A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.

1. Avogadro's number
2. Planck's constant
3. Boltzmann's constant
4. Madelung constant

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8. A germanium atom has an atomic weight of 72. How many neutrons are there?

1. 32
2. 4O
3. 34
4. 36

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9. A good conductor has how many valence electrons?

1. 1
2. 4
3. 2
4. 8

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10. A group of magnetically aligned atoms is called

1. Range
2. Lattice
3. Domain
4. Crystal

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