SA Questions and MCQs Chapter 2.1
Structure of atom

Short QAs
1. Who first proposed the idea of atom?
2. What does the word 'atom' mean?
3. Who gave the atomic theory on scientific basis?
4. In which year did Dalton propose his atomic theory?
5. What is Dalton's atomic theory?
6. Name the laws explained by Dalton's atomic theory.
7. Why did Dalton's atomic theory fail?
8. What are sub-atomic particles?
9. State the basic rule of charged particles.
10. Who studied electricity through electrolyte solutions?
11. What did Faraday's experiments suggest?
12. What is a cathode ray discharge tube?
13. From where do cathode rays originate?
14. Towards which electrode do cathode rays move?
15. What are cathode rays?
16. What happens when cathode rays strike zinc sulphide?
17. How do cathode rays travel in absence of fields?
18. What do cathode ray experiments prove?
19. What is the charge on an electron?
20. Who discovered the electron?
21. Do cathode ray properties depend on the gas used?
22. Do cathode ray properties depend on electrode material?
23. Why are electrons called basic constituents of atoms?
24. What is fluorescence?
25. What is phosphorescence?
MCQS

1. The word 'atom' is derived from:
A) Latin word B) Greek word C) French word D) Arabic word
2. The meaning of 'a-tomio' is:
A) Small particle B) Invisible particle C) Non-divisible D) Charged particle
3. Who proposed the atomic theory on scientific basis?
A) John Dalton B) Michael Faraday C) J. J. Thomson D) Ernest Rutherford
4. Dalton proposed his atomic theory in:
A) 1808 B) 1830 C) 1897 D) 1911
5. According to Dalton, atoms are:
A) Divisible B) Negatively charged C) Indivisible D) Neutral particles only
6. Dalton’s atomic theory successfully explained:
A) Nuclear structure B) Radioactivity C) Laws of chemical combination D) Discovery of electrons
7. Which scientist studied electricity through electrolyte solutions?
A) John Dalton B) Michael Faraday C) Niels Bohr D) James Chadwick
8. Cathode rays move from:
A) Anode to cathode B) Cathode to anode C) Electrode to solution D) Nucleus to electron
9. Cathode rays consist of:
A) Positively charged particles B) Neutral particles C) Negatively charged particles D) Alpha particles
10. The negatively charged particles discovered in cathode rays are called:
A) Protons B) Neutrons C) Electrons D) Positrons
11. Who discovered the electron?
A) J. J. Thomson B) Ernest Rutherford C) Niels Bohr D) John Dalton
12. Cathode rays travel in:
A) Circular path B) Zig-zag path C) Straight line D) Random path
13. Which material glows when struck by cathode rays?
A) Copper sulphate B) Zinc sulphide C) Sodium chloride D) Calcium oxide
14. Cathode rays show fluorescence because they:
A) Produce heat B) Carry sound C) Strike fluorescent materials D) Dissolve gases
15. The properties of cathode rays do not depend upon:
A) Nature of gas B) Material of electrodes C) Both A and B D) Voltage applied
16. Which statement is correct about electrons?
A) Present only in metals B) Present only in gases C) Present in all atoms D) Present only in cathode ray tubes
17. Like charges:
A) Attract each other B) Repel each other C) Become neutral D) Produce neutrons
18. Unlike charges:
A) Repel each other B) Destroy each other C) Attract each other D) Produce light only
19. A cathode ray tube contains gas at:
A) High pressure B) Atmospheric pressure C) Very low pressure D) Zero pressure
20. Television picture tubes are based on:
A) Alpha rays B) Beta rays C) Cathode rays D) X‐rays