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 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