Structure of the Atom - Multiple Choice Test

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