Structure of the Atom - Multiple Choice Test


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Question 1

Question:   Almost the entire mass of an atom is concentrated in the__________.

1. proton
2. electrons
3. nucleus
4. neutrons

Answer:    3

Question 2

Question:   Electron was discovered by___________.

1. Chadwick
2. Thomson
3. Goldstein
4. Bohr

Answer:    2

Question 3

Question:   An atom has a mass number of 23 and atomic number 11. The number of protons are_________.

1. 11
2. 12
3. 23
4. 44

Answer:    1

Question 4

Question:   The mass of the atom is determined by________.

1. neutrons
2. neutron and proton
3. electron
4. electron and neutron

Answer:    2

Question 5

Question:   The K, L and M shells of an atom are full. Its atomic number is_______.

1. 18
2. 20
3. 10
4. 12

Answer:    1

Question 6

Question:   Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?

1. 1 cm Hg
2. 1 mm Hg
3. 0.001 cm Hg
4. 0.001 mm Hg

Answer:    4

Question 7

Question:   Cathode rays are deflected towards__________.

1. positive electrode
2. negative electrode
3. both electrodes
4. none of the electrodes

Answer:    1

Question 8

Question:   The absolute charge of an electron is___________.

1. - 1.6 x 10-19C
2. + 1.6 x 10-19C
3. 1.6 x 10-19C
4. 16 x 10-19C

Answer:    1

Question 9

Question:   The proton is heavier than an electron by___________.

1. 1850 times
2. 1840 times
3. 1000 times
4. 100 times

Answer:    2

Question 10

Question:   Carbon-12 atom has_______________.

1. 6 electrons, 6 protons, 6 neutrons
2. 6 electrons, 12 protons, 6 neutrons
3. 12 electrons, 6 protons, 6 neutrons
4. 18 electrons, 6 protons and 6 neutrons

Answer:    1

Question 11

Question:   Chadwick got the Nobel Prize for the discovery of __________.

1. protons
2. neutrons
3. electrons
4. mesons

Answer:    2

Question 12

Question:   Mass number is equal to the_________.

1. number of protons + number of electrons
2. number of protons + number of neutrons
3. number of neutrons + number of electrons
4. number of electrons

Answer:    2

Question 13

Question:   The element X has 2 valence electrons. It is a____________.

1. metal
2. non-metal
3. metalloid
4. gas

Answer:    1

Question 14

Question:   The volume of the nucleus of an atom when compared to the extra nuclear part is_________.

1. bigger
2. smaller
3. same size
4. unpredictable

Answer:    2

Question 15

Question:   In Rutherford's alpha-scattering experiment, a foil of element that was used _______________.

1. gold
2. silver
3. aluminum
4. magnesium

Answer:    1

Question 16

Question:   An element has an electronic configuration of 2, 8, 7. Its valency is

1. 1
2. 7
3. 17
4. 8

Answer:    1

Question 17

Question:   The other name of is _________

1. protium
2. tritium
3. deuterium
4. proton

Answer:    1

Question 18

Question:   During a chemical reaction, atomic number_________.

1. changes
2. remains same
3. changes and then is restored
4. changes alternately

Answer:    2

Question 19

Question:   The fixed circular paths around the nucleus are called_________.

1. orbits
2. orbitals
3. nucleons
4. mesons

Answer:    1



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