9th Chemistry Unit 3 Atomic Structure MCQs Sindh Board

 9th Grade Chemistry Chapter 3 Atomic Structure Sindh Board MCQs Notes Online Chapter Wise Question Answers. Sindh Boards Chemistry Subject Notes For Exams Preparations Karachi, Jamshoro, Sindh Boards. Chemistry class Ninth sindh board notes Unit 3 Atomic Structure Most Repeated Multiple Choice Questions With Answers. Chemistry notes for class IX sindh board karachi Boards.

9th Chemistry Sindh Board MCQs
9th MCQs Atomic Structure Unit 3 chemistry

Q.1: The nucleus of an atom consists of:?
  1. Electrons and neutrons
  2. Electrons and protons
  3. Protons and neutrons
  4. None of these
C
Q.2: Which particle is the lightest in the following:?
  1. particles
  2. Electron
  3. Proton
  4. Neutron
B
Q.3: Which particles is heavier than others.?
  1. particles
  2. Proton
  3. Neutron
  4. Electron
C
Q.4: The mass of electron is:?
  1. 9.11 x 10-28g
  2. 9.11 x 10-27g
  3. 9.11 x 10-30g
  4. 9.11 x 10-26g
A
Q.5: The mass of proton is:?
  1. 1.67 x 10-25g
  2. 1.67 x 10-24g
  3. 1.67 x 10-23g
  4. 1.67 x 10-22g
B
Q.6: Charge on an electron is:?
  1. 1.6 x 10-19g
  2. 1.6 x 10-17g
  3. 1.6 x 10-18g
  4. 1.6 x 10-16g
A
Q.7: Atoms are neither created n or destroyed in chemical reaction is the assumption of?
  1. Dalton
  2. Rutherford
  3. Bohrs
  4. Democritus
A
Q.8: Electrons were discovered by?
  1. Rutherford
  2. J.J Thomson
  3. James Chadwick
  4. Goldstein
B
Q.9: James Chadwick discovered the?
  1. Nucleus
  2. Neutron
  3. Proton
  4. Electron
B
Q.10: Which rays deflected towards negative pole in electric or magnetic field.?
  1. Alpha rays
  2. Cathode rays
  3. Beta rays
  4. Gamma rays
A
Q.11: The e/m ratio of the ---------- rays varies with the nature of gas in the discharged tube.?
  1. Positive rays
  2. Cathode rays
  3. Gamma rays
  4. Beta rays
A
Q.12: In Rutherford’s experiment very few alpha particles are?
  1. Deflected at large angles
  2. un deflected
  3. bounced
  4. none of these
C
Q.13: Atomic number of oxygen is?
  1. 9
  2. 8
  3. 7
  4. 6
B
Q.14: Tritium and isotopes of hydrogen contains ---------- neutrons.?
  1. 3
  2. 1
  3. 2
  4. none
C
Q.15: Chemical properties of an element depend on the ---------- in the shells.?
  1. Protons
  2. neutrons
  3. electrons
  4. none of them
C
Q.16: Mass number of protium is:?
  1. 2
  2. 1
  3. 4
  4. 3
B
Q.17: When cathode rays hit an object, they produce?
  1. Sound
  2. Darkness
  3. Effervescence
  4. Fluorescence
D
Q.18: A neutron has a mass equal to a proton and it has?
  1. No charge
  2. Negative charge
  3. Double positive charge
  4. Positive charge
A
Q.19: A proton is how many times heavier than an electron?
  1. 1936
  2. 1736
  3. 1636
  4. 1836
D
Q.20: Radioactive rays are of?
  1. 3 types
  2. 6 types
  3. 4 types
  4. 2 types
A
Q.21: Who put forward his atomic model in 1911?
  1. Rutherford
  2. Goldstein
  3. Neil Bohr
  4. Aufbau
A
Q.22: The mass of an atom is concentrated in the?
  1. Orbit
  2. Shell
  3. Nucleus
  4. Energy level
C
Q.23: Atomic number shows the number of electrons or protons in an atom and is denoted by?
  1. Z
  2. M
  3. A
  4. N
A
Q.24: The maximum number of electron in a shall is found out by the formula?
  1. 2n2
  2. n
  3. n2
  4. 2n
A
Q.25: Which particle is the lightest in the following?
  1. Particles
  2. Proton
  3. Electron
  4. Neutron
C
Q.26: Which particles is heavier than others?
  1. Particles
  2. Proton
  3. Neutron
  4. Electron
C
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