Picat general science

Which of these reduces friction?

A.- car brakes

B.-tire tread

C. ball bearings

D.- sandpaper

C. ball bearings

When a lobster grows a claw to replace one that was lost, the process is called

A.- restoration.

B.-retraction.

C.- regeneration.

D.-reproduction.

regeneration.

PART Any astronomical body that revolves around a larger body is called

A.- a nova,

B.-a comet.

C.- a satellite.

D.- an asteroid.

E.-a meteoroid,

a satellite.

In chemistry, to be classified as an organic substance, a substance must contain

A.-sugar molecules.

B.- sodium atoms.

C.-carbon atoms.

D.-water molecules.

C carbon atoms.

Which element does NOT contain any neutrons?

A.-iron

B.-carbon

C.-oxygen

D.-hydrogen

hydrogen

The chemical formula of a compound describes the elements the compound contains and the

A.-pH of the compound.

B.-conduction of the compound.

C.-ratio of eleménts in the compound.

D.-ratio of neutrons to protons in each element.

ratio of eleménts in the compound.

What is the symbol for the hydroxyl ion?

A.- H

B.- OH-

C.- H2O

D.- H3O

B. OH-

The tympanic membranes are also known as the

A.- eye lids.

B.-sinuses.

C.-ear drums.

D.-vocal cords.

ear drums.

Which of the following actions produce a chemical change?

A.-boiling water

B.-burning the rice

C.-adding salt to the hot water

D.-melting butter on cooked rice

adding salt to the hot water

Choking is prevented by the

A.-diaphragm remaining down.

B.-vibration of the vocal cords.

C.-esophagus moving the food.

D.-epiglottis covering the voice box.

epiglottis covering the voice box.

A perpetual-motion machine can never be built because it is not possible to eliminate

A.-momentum.

B.-inertia.

C.-elasticity.

D.-friction.

inertia.

Which of the following is a renewable resource?

A.-сopper

B.-aluminum

C.-peanut oil

D.-natural gas

peanut oil

When scientists measure a liquid's resistance to flow, they are measuring the liquid's

A.-density.

B.-solubility.

C.-viscosity.

D.-permeability.

viscosity.

When sodium atoms form sodium ions, they A.-share protons.

B.-gain neutrons.

C.-lose electrons.

D.-share photons.

lose electrons.

The filament in an electric light bulb is made from

A.-platinum.

B.-fiberglass.

C.-aluminum.

D.-tungsten.

tungsten.