Introduction to electrical Engineering

Give the name of materials which contain lots of free electrons.

• insulators

• conductors

• semiconductors

• None of the above

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Electrons in the outer orbit are called

• shells

• valences

• nuclei

• All the above

When a person combs his hair, static electricity is sometimes generated by what process?

• Friction between the comb and hair transfers electrons.

• Induction between the comb and hair.

• Deduction between the comb and hair.

• Contact between the comb and hair results in a charge.

What are the basic components of a simple electric circuit?

• energy source

• connecting wires

• switch

• All the above

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NGSS.MS-ETS1-1

Which of the following is not a type of energy source?

• generator

• solar cell

• rheostat

• battery

What are the types of electricity?

• Static electricity

• Current electricity

• both (a) & (b)

• none of the above

Which of the following is true of electrical forces?

• Like charges attract, unlike charges repel.

• Electrical forces are produced by electrical charges.

• Positive and negative charges can combine to produce the third type

• Electrical forces are weaker than gravitational forces.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the following is not an electrical classification of materials?

• Semiconductors

• Semi-insulators

• Insulators

• Conductors

Out of the following which is not a poor conductor?

• carbon

• copper

• cast iron

• Tungsten

Out of the following which is an insulating material?

• copper

• gold

• silver

• paper

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NGSS.MS-PS3-3