CBSE Class 11 Chemistry Structure of Atom MCQs Set B

 

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

 

Tags: 

 


Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Digital Marks Sheets Migration Certificates and Pass Certificates

CBSE pioneered in providing digital academic documents through its academic repository called “Parinam Manjusha” and DigiLocker.  As on now result data from 2004 till this year is available in the repository.  Approx. 12 crores digital academic documents are available...

BRICS International Online Mathematics Competition

BRICSMATH.COM is an annual International Online Competition in Mathematics, for students of classes I – XII of 07 BRICS countries (Brazil, Russia, India, China and South Africa, Indonesia and Vietnam). The competition is held online on the website www.bricsmath.com and...

How to Effectively Answer CBSE Board Examination Question Papers

The intend of this article is to share the best ways to answer the CBSE Board Examination. Usually most of the students tend to become nervous at the times of the board examination. In this article we will share the most effective ways to make the answers to the CBSE...

Celebration of Republic Day by CBSE

As you are aware, Republic Day is celebrated every year on 26th January to honour the Constitution and Republic of our country. Celebration of this occasion annually helps youth and children of our country to be aware of the significance of Indian Constitution, unity...

Tricks for Utilization of additional time introduced in CBSE Board Exams

Tricks for Proper Utilization of Add-On 15 Minutes introduced in CBSE Board Exams The intend of this article is to share the best suggestions and guidelines to utilize the extra 15 minutes provided for reading the question paper in CBSE Board Examination. These extra...

The CBSE Science Challenge 2020

The CBSE Science Challenge - 2020 Science is inexplicably linked with our lives and helps us to understand the world around us better. Scientific and technological developments contribute to progress and help improve our standards of living. By engaging with this...

×
Studies Today