Answer the following question given this paragraph: An atom has negatively-charged electrons in orbit around its nucleus. Q: What orbits an atoms' nucleus? Choices: - neutrally charged ions - positively charged protons - isotopes - negatively charged electrons A:
negatively charged electrons
(Question)
Answer the following question given this paragraph: Q: Copper oxide is a result of what two substances mixing? Choices: - copper and gas - metal and oxygen - crystal and oxygen - copper and oxygen A:
(Answer)
copper and oxygen
Ques: Answer the following question given this paragraph: With an occluded front , a warm air mass becomes trapped between two cold air masses. The warm air is lifted up above the cold air as in Figure below . Cloudy weather and precipitation along the front are typical. Q: When a warm air mass becomes trapped between two cold air masses, what type of front occurs? Choices: - storm front - obscured front - stationary front - occluded front A:
Ans: occluded front
(Q).
Answer the following question given this paragraph: Viroids Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but like viruses can reproduce only within a host cell. Viroids do not, however, manufacture any proteins, and they only produce a single, specific RNA molecule. Human diseases caused by viroids have yet to be identified. Viroids are known to infect plants (Figure 21.18) and are responsible for crop failures and the loss of millions of dollars in agricultural revenue each year. Some of the plants they infect include potatoes, cucumbers, tomatoes, chrysanthemums, avocados, and coconut palms. Q: Viroids are plant pathogens much simpler than what, but like them can reproduce only within a host cell? Choices: - pests - bacteria - parasites - viruses A:
(A).
viruses
Ques:Answer the following question given this paragraph: Volcanoes may be active, dormant, or extinct. This depends on whether there is the possibility of magma in their magma chambers. Q: Volcanoes are termed active, dormant, or extinct depending on the possibility of the presence of what in chamber structures? Choices: - coal - sulpher - water - magma A:

Ans:magma
Answer the following question given this paragraph: In harmonic motion there is always a restorative force , which acts in the opposite direction of the velocity. The restorative force changes during oscillation and depends on the position of the object. In a pendulum it is the component of gravity along the path of motion. The force on the oscillating object is directly opposite that of the direction of velocity. Q: A solute generally has what effect on the boiling point of a solvent? Choices: - randomizes - lowers - none - raises A:
raises