Class 11 Chemistry Chapter 3 MCQs – The Atomic Structure

Here we are going to provide class 11 Chemistry chapter 3 the atomic structure solved MCQs for Sindh board students that help in their exam.

Class 11 Chemistry Chapter 3 MCQs
11th Class Chemistry Chapter 3 MCQs

11 Class Chemistry Chapter 3 Solved MCQs

It can help 1st-year chemistry chapter 3 MCQs for Karachi, Hyderabad, Larkana, and Sukkur Board students in their Sindh Examination.

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1. Properties of waves are

a) Wavelength

b) Wave number

c) Frequency

d) All

Answer: d) All


2. Which one of the following is not the unit of the wave number

a) m-1

b) cm-1

c) mm-2

d) cm

Answer: d) cm


3. The velocity of photon of light is:

a) Equal to square of its amplitude

b) Depends on its source

c) Depends on its way of travelling

d) Independent of its source

Answer: d) Independent of its source


4. The value of Planck’s constant is:

a) 6.62×10-34 J.S

b) 6.62X10-27 J.S

c) 6.62X10-14 J.S

d) 6.62X10-32 J.S

Answer: a) 6.62×10-34 J.S


5. The relation between energy of a photon of light and its frequency was given by:

a) Broglie in his nature of matter

b) Bohr in his model

c) Rutherford in his a-rays scattering experiment

d) Planck in his quantum theory

Answer: d) Planck in his quantum theory


6. On which laws Rutherford’s atomic model was based on:

a) Laws of mass action

b) Laws of motion and gravitation

c) Law of conservation of energy

d) None of the above

Answer: b) Laws of motion and gravitation


7. According to Rutherford’s Model, the revolving electron should not emit the energy continuously.

a) True

b) False

Answer: b) False


8. Rutherford concluded that atoms contain heavy and positively charged parts of the center. And called this center a nucleus.

a) True

b) False

Answer: a) True


9. The wavelength of x-ray emitted from the surface of the metal depends upon:

a) Atomic number of metals

b) Wavelength of x-ray

c) Both of the above

d) None of the above

Answer: a) Atomic number of metals


10. Moseley’s law is the relationship between the __________ of line spectrum of x-ray.

a) Atomic number

b) Frequency

c) Wavelength

d) All of the above

Answer: b) Frequency


11. The atomic number is the number of _________ in the nucleus of an atom.

a) Neutrons

b) Electrons

c) Protons

d) All of the above

Answer: c) Protons


12. The energy levels of H-atom in Bohr model are called:

a) Ground state energy levels

b) Orbits

c) Orbitals

d) Degenerate orbitals

Answer: b) Orbits


13. The value of Bohr radius for 1st orbit of H-atom is:

a) 0.529 x 10-6 cm

b) 0.529 x 10-8 cm

c) 0.529 x 10-19 cm

d) 0.529 x 10-12 cm

Answer: b) 0.529 x 10-8 cm


14. Bohr model of atom explains:

a) Photoelectric effect

b) Stark effect

c) Zeeman effect

d) None

Answer: a) Photoelectric effect


15. According, to the Bohr’s model, the radius of second orbit is:

a) 2 A0

b) 2.1 A0

c) 2.11 x 10-14 m

d) 2.11 x 10-19 m

Answer: b) 2.1 A0


16. When the electron is brought from infinity to the ground state of the hydrogen atom, the energy is:

a) emitted

b) Absorbed

c) Not effected

d) Is influenced by the surrounding

Answer: a) emitted


Conclusion

The topic of this post is class 11 chemistry chapter 3 mcqs with answers for exams paper preparation additionally we add this post into the 11th class category.

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