Question: Which of the scientist were able to prove that atom is no longer non-divisible?
- a) Michael Faraday
- b) Chadwick
- c) Dalton
- d) Thomson
Answer: Michael Faraday
Question: Which of the following is never true for cathode rays ?
- a) They are electromagnetic waves.
- b) They produce heat.
- c) They produce mechanical pressure
- d) They possess kinetic energy.
Answer: They are electromagnetic waves.
Question: Cathode rays are deflected by
- a) by both
- b) an electric field only
- c) magnetic field only
- d) by none
Answer: by both
Question: Which of the following statement is not correct about the characteristics of cathode rays?
- a) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube
- b) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube
- c) They travel in straight line in the absence of an external electrical or magnetic field.
- d) They start from the cathode and move towards the anode.
Answer: Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube
Question: Which of the following statements about the electron is incorrect?
- a) The mass of electron is equal to the mass of neutron
- b) It is a basic constituent of all atoms.
- c) It is a constituent of cathode rays.
- d) It is negatively charged particle
Answer: The mass of electron is equal to the mass of neutron
Question: While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?
- a) Air is a poor conductor of electricity under normal conditions
- b) Carbon dioxide is present in air
- c) Dust particles are present in air
- d) None of the above
Answer: Air is a poor conductor of electricity under normal conditions
Question: Which is not true with respect to cathode rays?
- a) Move with speed same as that of light
- b) Can be deflected by magnetic fields
- c) Charged particles
- d) A stream of electrons
Answer: Move with speed same as that of light
Question: What is the optimum conditions required to study the conduction of electricity through gases.
- a) Low pressure and high voltage
- b) Low pressure and low voltage
- c) High pressure and high voltage
- d) High pressure and low voltage
Answer: Low pressure and high voltage
Question: In discharge tube experiment stream of negatively charged particles travel from
- a) cathode to anode
- b) Electrons does not travel
- c) anode to cathode
- d) None of these
Answer: cathode to anode
Question: Millikan performed an experiment method to determine which of the following ?
- a) Charge of the electron
- b) Mass of the electron
- c) e/m ratio of electron
- d) Both (a) and (b)
Answer: Charge of the electron
More Questions...............................
Question: Which is correct statement about proton ?
- a) Proton is ionized hydrogen atom
- b) Proton is nucleus of deuterium
- c) Proton is ionized hydrogen molecule
- d) None of these
Answer: Proton is ionized hydrogen atom
Question: The lightest particle is
- a) positron
- b) neutron
- c) proton
- d) None of these
Answer: positron
Question: When beryllium is bombarded with alpha particles (Chadwick’s experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are given out. These are
- a) A beam of neutrons
- b) Alpha rays
- c) A beam of neutrons and protons
- d) A beam of protons
Answer: A beam of neutrons
Question: The discovery of neutron became very late because
- a) neutrons are chargeless
- b) neutrons are fundamental particles
- c) all of the above
- d) None of these
Answer: neutrons are chargeless
Question: Neutron is discovered by
- a) Chadwick
- b) Yukawa
- c) Rutherford
- d) Dalton
Answer: Chadwick
Question:
- a) Electrons, neutrons, protons
- b) Electrons, protons, neutrons
- c) Neutrons, protons, electrons
- d) Protons, neutrons, electrons
Answer: Electrons, neutrons, protons
Question: Which of the following properties of atom could be explained correctly by Thomson Model of atom?
- a) Overall neutrality of atom
- b) Spectra of hydrogen atom
- c) Position of electrons, protons and neutrons in atom
- d) Stability of atom.
Answer: Overall neutrality of atom
Question: When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected. This is because
- a) the nucleus occupies much smaller volume compared to the volume of the atom
- b) there is only one nucleus and large number of electrons
- c) the force of attraction between alpha particle and oppositely charged electrons is very small
- d) the force of repulsion on the moving alpha particle is small
Answer: the nucleus occupies much smaller volume compared to the volume of the atom
Question:
- a) all positive ions are deposited at small part
- b) all negative ions are deposited at small part
- c) proton moves around the electron
- d) neutrons are charged particles
Answer: all positive ions are deposited at small part
Question: Nucleons are
- a) neutrons + protons
- b) neutrons + protons + electrons
- c) neutrons + electrons
- d) only neutrons
Answer: neutrons + protons