MCQ Structure of the Atom | NCERT Class 9 Science

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MCQ Structure of the Atom - Atomic Model — **Atomic Model**

Online Test | MCQ Structure of the Atom | NCERT Class 9 Science Chapter 4 | CBSE Syllabus

Every student of class 9 of NCERT/CBSE syllabus may take part this online test of NCERT Class 9 Science Chapter 4 MCQ Structure of the Atom and verify his score to check preparedness

#1. Which of the following statements are correct about Rutherford’s model of atom – a. considered the nucleus as positively charged, b. established that α-particles are four times as heavy as a hydrogen atom, c. can be compared to solar system, d. was in agreement with Thompson’s model??

a, c

b, c

a, d

#2. Which of the following represents the electronic distribution of Mg atom?

a) 3, 8, 1

b) 2, 8, 2

c) 1, 8, 3

d) 8, 2, 2

#3. An atom with 3 protons & 4 neutrons will have a valency of

a) 3

b) 7

c) 1

d) 4

#4. The correct electron configuration of sodium is –

a) 2, 8

b) 8, 2, 1

c) 2, 1, 8

d) 2, 8, 1

#5. Which are correct about Thompson’s model of atom – a. the mass of the atom is assumed to be uniformly distributed over the atom, b. the positive charge is assumed to be uniformly distributed over the atom, c. the electrons are uniformly distributed in the positively charged sphere, d. the electrons attract each other to stabilize the atom ?

a, b, c

a, c

a, d

a, c, d

#6. Identify the Mg²⁺ ion from the following figure where n = no. of neutrons & p = no. of protons.

#7. The ion of an element has 3 +ve charges. Mass no. of the atom is 27. No. of neutrons is 14. What is the no. of electrons in the ion?

a) 13

b) 10

c) 14

d) 16

#8. Arrange a. Rutherford’s atomic model, b. Thomson’s atomic model, c. Bohr’s atomic model, in the order of their chronological order.

a, b, c

b, c, a

b, a, c

c, b, a

#9. Isotopes of an element have

a) same physical properties

b) different chemical properties

c) different atomic numbers

d) different number of neutrons

#10. Select the option where both are correct – a) atomic no. = no. of protons + no. of electron, b) mass no. = no. of protons + no. of neutron, c) atomic mass = no. of protons = no. of neutrons, d) atomic no. = no. of protons = no. of electron?

a) & c)

b) & d)

c) & d)

b) & c)

#11. Which figures do not represent Bohr’s atomic model correctly?

a & c

b & c

b & d

a & d

#12. Which of the following are true for an element – a) atomic no. = no. of protons + no. of electrons, b) mass no. = no. of protons + no. of neutrons, c) atomic mass = no. of protons = no. of neutrons, d) atomic no. = no. of protons = no. of electrons

a) & b)

a) & c)

b) & c)

b) & d)

#13. The electron distribution in an aluminium atom is –

a) 2, 8, 3

b) 2, 8, 2

c) 8, 2, 3

d) 2, 3, 8

#14. Elements with valency 1 are

a) always metals

b) always metalloids

c) either metals or non-metals

d) always non-metals

#15. The first model of an atom was given by

a) N. Bohr

b) E. Goldstein

c) Rutherford

d) J. J. Thompson

#16. Rutherford’s α-particle scattering experiment was responsible for the discovery of –

a) atomic nucleus

b) electron

c) proton

d) neutron

#17. In a sample of ethyl ethanoate (CH₃COOC₂H₅), the two oxygen atoms have the same no. of electrons but different no. of neutrons. Which of the following statement is correct?

a) one of the oxygen atoms has gained electrons

b) one of the oxygen atoms has gained two neutrons

c) the two oxygen atoms are isotopes

d) the two oxygen atoms are isobars

#18. Number of valence electron in Cl^– are –

a) 16

b) 8

c) 17

d) 18

#19. Which of the following statement is always correct

a) an atom has equal no. of electrons & protons

b) an atom has equal no. of electrons & neutrons

c) an atom has equal no. of neutrons & protons

d) an atom has equal no. of electrons, protons & neutrons

#20. Rutherford’s alpha(∝) particles scattering experiment resulted in to discovery of

a) electron

b) proton

c) nucleus in the atom

d) atomic mass

#21. Which are correct about Rutherford’s α-particle scattering experiment – a. electrons have negative charge, b. the mass & positive charges of the atom is concentrated in the nucleus, c. neutron exists in the nucleus, d. most of the space in the atom is empty ?

a, c

b, d

a, d

c, d

#22. The number of electrons in an element X is 15 & the number of neutrons is 16. Which of the following is the correct representation?

a) ³¹X₁₅

a) ³¹X₁₆

c) ¹⁶X₁₅

d) ¹⁵X₁₆

#23. Dalton’s atomic theory successfully explained – a. law of conservation of mass, b. law of constant composition, c. law of radioactivity, d. law of multiple proportion.

a, b, c

a, c, d

b, c, d

a, b, d

Finish

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To Be Continued

Online Test | MCQ Structure of the Atom | NCERT Class 9 Science Chapter 4 | CBSE Syllabus

#1. Which of the following statements are correct about Rutherford’s model of atom – a. considered the nucleus as positively charged, b. established that α-particles are four times as heavy as a hydrogen atom, c. can be compared to solar system, d. was in agreement with Thompson’s model??

#2. Which of the following represents the electronic distribution of Mg atom?

#3. An atom with 3 protons & 4 neutrons will have a valency of

#4. The correct electron configuration of sodium is –

#6. Identify the Mg2+ ion from the following figure where n = no. of neutrons & p = no. of protons.

#7. The ion of an element has 3 +ve charges. Mass no. of the atom is 27. No. of neutrons is 14. What is the no. of electrons in the ion?

#8. Arrange a. Rutherford’s atomic model, b. Thomson’s atomic model, c. Bohr’s atomic model, in the order of their chronological order.

#9. Isotopes of an element have

#10. Select the option where both are correct – a) atomic no. = no. of protons + no. of electron, b) mass no. = no. of protons + no. of neutron, c) atomic mass = no. of protons = no. of neutrons, d) atomic no. = no. of protons = no. of electron?

#11. Which figures do not represent Bohr’s atomic model correctly?

#12. Which of the following are true for an element – a) atomic no. = no. of protons + no. of electrons, b) mass no. = no. of protons + no. of neutrons, c) atomic mass = no. of protons = no. of neutrons, d) atomic no. = no. of protons = no. of electrons

#13. The electron distribution in an aluminium atom is –

#14. Elements with valency 1 are

#15. The first model of an atom was given by

#16. Rutherford’s α-particle scattering experiment was responsible for the discovery of –

#17. In a sample of ethyl ethanoate (CH3COOC2H5), the two oxygen atoms have the same no. of electrons but different no. of neutrons. Which of the following statement is correct?

#18. Number of valence electron in Cl– are –

#19. Which of the following statement is always correct

#20. Rutherford’s alpha(∝) particles scattering experiment resulted in to discovery of

#21. Which are correct about Rutherford’s α-particle scattering experiment – a. electrons have negative charge, b. the mass & positive charges of the atom is concentrated in the nucleus, c. neutron exists in the nucleus, d. most of the space in the atom is empty ?

#22. The number of electrons in an element X is 15 & the number of neutrons is 16. Which of the following is the correct representation?

#23. Dalton’s atomic theory successfully explained – a. law of conservation of mass, b. law of constant composition, c. law of radioactivity, d. law of multiple proportion.

Results

#6. Identify the Mg²⁺ ion from the following figure where n = no. of neutrons & p = no. of protons.

#17. In a sample of ethyl ethanoate (CH₃COOC₂H₅), the two oxygen atoms have the same no. of electrons but different no. of neutrons. Which of the following statement is correct?

#18. Number of valence electron in Cl^– are –