(Q).
Answer the following question given this paragraph: The transfer of electrons from the van de Graaff generator to the man is an example of conduction. Conduction occurs when there is direct contact between materials that differ in their ability to give up or accept electrons. A van de Graff generator produces a negative charge on its dome, so it tends to give up electrons. Human hands are positively charged, so they tend to accept electrons. Therefore, electrons flow from the dome to the man's hand when they are in contact. Q: A van de graff generator produces what type of charge on its dome, causing the tendency to give up electrons? Choices: - positive charge - similar charge - no charge - negative charge A:
(A).
negative charge

(Q).
Answer the following question given this paragraph: When current keeps reversing direction, it is called alternating current (AC) . You can see how it works in the two diagrams below. The current that comes from a power plant and supplies electricity to homes and businesses is alternating current. The current changes direction 60 times per second. It happens so quickly that the light bulb doesn't have a chance to stop glowing when the reversals occur. Q: What is it called when currents keep reversing direction? Choices: - circle current - emitting current - stream current - alternating current A:
(A).
alternating current

(Q).
Answer the following question given this paragraph: When lactose is absent, a repressor protein binds to the operator. The operator is located between the promoter and the three lac operon genes. The protein blocks the binding of RNA polymerase to the promoter. As a result, the lac genes are not expressed. Q: When lactose is absent, a repressor protein binds to what? Choices: - differential - network - worker - operator A:
(A).
operator