chapter 1 quiz 1

All matter is composed of four components (water, air, dust, and fire) with different ratios. That idea belongs to....

• Aristotle

• Bohr

• Rutherford

• Dalton

The apparatus which is illustrated in the opposite figure does not produce cathode rays, what is the modification which should be considered to obtain the rays ? .........

• altering the connection of the electrodes of the source of electricity.

• heating the anode instead of the cathode.

• using an alternating current source instead of direct current source .

• discharging the air from the tube.

All of the following are among the properties of the cathode rays, except ........ ..

• stream of electrons.

• move at the speed of light.

• charged particles.

• deflect with the effect of a magnetic field.

Rutherford's model of atom .... ..

• assumed that the atom is solid.

• assumed that the positively charged nucleus rotate inside the atom.

• assumed that the electrons rotate around the nucleus in any location in the atom .

• the first discovery of the nucleus

regarding to the figure, after the production of the cathode ray, which of the two electrodes A or B is hotter

• A

• B

• both are hot

The opposite figure represents α-particles (A, B, C) which of these particles hit the same places in which they appeared before placing the gold foil

• A

• B

• C

The reach of the cathode ray at point B, indicates that the cathode ray

• has negative charge

• has particle nature

• moves in straight lines

• affected by magnet

what would happened if all maters are made of Air, Fire dust and water

• we are able to convert from one element to another

• the environment is preserved

• the modern science will confirm the formation of new material from changing the ratios of those four elements

Each of the following is among Thomson's theory postulates, except .....

• the protons and neutrons are uniformly distributed over the entire volume of the atom

• the atom is sphere

• the atom is electrically neutral

• the atom is massive

Each of the following is among Dalton's theory postulates, except ..... ..

• atoms of the elements contain protons, neutrons and electrons.

• the masses of the atoms of the same element are similar.

• The atom is undividable

• each element is formed from tiny particles called atoms.